A neutron has a mass of 1.0087 amu, a proton has a mass of 1.0073 amu, and an electron has a mass of 5.486 x 10-3.5 amu. Give your response in rounded joules.
mp stands for proton mass (1.007277 amu) mn = the neutron's mass (1.008665 amu). The neutron has a little smaller mass than a proton. A neutron is estimated to have a rest mass of 1.6749286 x 1027 kg. The units of energy and mass are equivalent in classical particle physics. The term "eV" in this context refers to an electron-volt, which is equal to one neutral proton. A neutron is a subatomic particle that can be found in the atom's nucleus. It weighs 1 amu and has no energy (is neutral). Average atomic mass is equal to f1M1, f2M2, f, and fnMn. where M is the isotope's mass number (weight) and f is the fraction indicating the isotope's natural abundance.
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Draw the Lewis structure for PF3Cl2 in the window below and then answer the questions that follow. What is the electron-pair geometry for P in PF3Cl2 ? What is the the shape (molecular geometry) of PF3Cl2?
Sp[tex]3[/tex] hybridization of a molecule with two lone pairs is present. This molecule's geometry is determined by its electron pair structure. If more than one bond angle is possible, separate each one with a space.
What is hybridization?The process of combining two atomic orbitals to produce a new variety of hybridized orbitals is described as hybridization. Usually, this mixing creates hybrid orbitals with entirely different energies, shapes, and other characteristics. Atomic orbitals with the same energy level are primarily responsible for hybridization. However, if the energies of the orbitals are equal, the process can involve both fully filled and partially filled orbitals. We can better understand bond formation, bond energies, and bond lengths by using the hybridization concept, which is an extension of valence bond theory. During the hybridization process, which primarily entails the merging of two orbitals, two "p" orbitals, or the mixing of a "s" orbital with a "p," the atomic orbitals of comparable energies are mixed together.To learn more about valence bond theory refer to:
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The alkali metals, found in group 1 of the periodic table, are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they readily lose that one electron to form ionic bonds with other elements. Sodium (na) is an alkali metal that bonds with chlorine (cl), a halogen, to form table salt (nacl). Based on what the periodic table can tell you about these two elements, explain how and why they bond to form nacl.
Answer:
The periodic table is a useful tool for understanding the properties of elements and predicting how they will interact with each other. The alkali metals, including sodium, are located in group 1 of the periodic table. These elements have only one electron in their outermost shell, which makes them very reactive. They readily lose this outer electron to form an ion with a positive charge, which is called a cation.
Chlorine, on the other hand, is a halogen located in group 17 of the periodic table. Halogens have seven electrons in their outermost shell, which makes them highly reactive. They readily gain an electron to form an ion with a negative charge, which is called an anion.
When sodium and chlorine interact, they form an ionic bond to create the compound sodium chloride, or table salt. In this process, sodium loses its outer electron to form a sodium cation, and chlorine gains an electron to form a chlorine anion. The positive sodium cation is then attracted to the negative chlorine anion, forming an ionic bond. This bond is strong enough to hold the two ions together, creating a stable compound.
Therefore, sodium and chlorine bond to form table salt because they have the opposite charges and opposite reactivities that are necessary to form an ionic bond. The periodic table can help us understand this bonding process by providing information about the number of electrons in the outermost shell of each element, which determines their reactivity and ability to form ions.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, in below given ways, periodic table helps in explaining the reason of bonding.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
Because sodium and chlorine have the opposing charges and reactivities required to create an ionic bond, they bind to make table salt. The periodic table can help us comprehend this bonding process by revealing the amount of electrons in each element's outermost shell, which governs their reactivity and capacity to generate ions.
Therefore, in above ways, periodic table helps in explaining the reason of bonding.
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C5H12(g) + O2(g) → CO2(g) + H₂O(g)
Classify the reaction
The combustion reaction is the process by which a chemical substance or hydrocarbon reacts with oxygen to produce carbon dioxide and water while also releasing energy in the form of light and heat.
What is combustion reaction?When a chemical substance interacts with oxygen to create carbon dioxide and water, a combustion process occurs and energy is released. O2 must be one of the reactants in it.An illustration of a combustion reaction is the burning of wood or coal indoors during the winter.Another illustration of a combustion reaction is the generation of energy in thermal power plants and the burning of gasoline and diesel in automobiles.An illustration of a general combustion reaction is as follows:O2 + CnH2n = nCO2 + nH2OFor more information on combustion reaction kindly visit to
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what volume of 0.162 mna3po4 solution is necessary to completely react with 91.4 ml of 0.104 m cacl2 ?
The volume of 0.162 mna3po4 solution is necessary to completely react with 91.4 ml of 0.104 m cacl2 is 0.137 L
To determine the volume of 0.162 M Na3PO4 solution that is necessary to completely react with 91.4 mL of 0.104 M CaCl2, you can use the concept of stoichiometry..
The chemical reaction between Na3PO4 and CaCl2 can be represented by the following balanced chemical equation:
3 Na3PO4 + 2 CaCl2 -> Ca3(PO4)2 + 6 NaCl
First, you need to convert the volumes of the solutions to moles using the molarities and the volume/molarity formula:
moles Na3PO4 = (0.162 M) * (91.4 mL / 1000 mL/L) = 0.0150 moles
moles CaCl2 = (0.104 M) * (91.4 mL / 1000 mL/L) = 0.0095 moles
Next, use the molar ratios in the balanced chemical equation to determine the volume of Na3PO4 solution that is necessary to react with 0.0095 moles of CaCl2:
(Volume Na3PO4 / 3) = (Volume CaCl2 / 2)
Solving for the volume of Na3PO4, you get:
Volume Na3PO4 = (3 / 2) * (Volume CaCl2)
Plugging in the values, you get:
Volume Na3PO4 = (3 / 2) * (91.4 mL / 1000 mL/L)
Solving, you get:
Volume Na3PO4 = 0.137 L
Therefore, the volume of 0.162 M Na3PO4 solution that is necessary to completely react with 91.4 mL of 0.104 M CaCl2 is approximately 0.137 L.
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Diazomethane is a toxic yellow gas that is both sensitive and explosive: However, it is a useful reagent in the laboratory to make key intermediates by reacting with carboxylic acids in a quick and clean reaction_ Draw the expected organic product of diazomethane with the following carboxylic acid. COOH Hc N=N; CH3
Methyl esters are created when carboxylic acids and diazomethane interact. Diazomethane is used to create methyl esters and has a high degree of reactivity.
Diazomethane reacts swiftly and extremely effectively, producing just N2 as a byproduct, making it an appealing alkylating agent for carboxylic and phenols (Black, 1983). As it responds, its inherent yellow color releases, automatically indicating the status of the reaction. Methyl esters are created when carboxylic acids and diazomethane interact. Diazomethane is created in-situ and then interacted with the carboxyl group right away to create the methyl ester due to its high reactivity. Diazomethane has mostly been used to transform carboxylic acids into esters (diazoalkales) that may be examined using GC/MS or HPLC-MS. In etherate solutions, methyl esters can be produced at room temperature quickly, thoroughly, and quantitatively.
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approximately 95 million barrels of oil are used daily worldwide. what would happen if this changed to 50 million barrels per day? what if it changed to 190 million barrels per day?
If the daily global consumption of oil were to decrease from approximately 95 million barrels per day to 50 million barrels per day, it would likely have significant economic and environmental consequences.
What environmental consequences will happen ?Economic impact: A decrease in oil consumption would likely lead to a decrease in the demand for oil and a decrease in the price of oil. This could have negative impacts on countries and companies that rely heavily on the production and export of oil, as they would likely see a decrease in revenue.Environmental impact: A decrease in oil consumption could lead to a reduction in greenhouse gas emissions, as the burning of oil is a major contributor to global greenhouse gas emissions. This could have positive impacts on the environment and climate change.Transportation: Oil is the primary source of fuel for many forms of transportation, including cars, trucks, airplanes, and ships. If oil consumption were to decrease, it could lead to a shift towards alternative forms of transportation, such as electric vehicles or vehicles that run on alternative fuels.Energy security: Decreasing oil consumption could also lead to a decrease in the reliance on oil as an energy source, which could potentially reduce the risk of energy supply disruptions due to geopolitical tensions or other factors.To learn more about oil consumption refer :
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a brittle white crystalline solid has a melting point of 760 c and reacts when added to water. this substance is most likely what type of solid
A brittle white crystalline solid reacts with when added to water is Quartz. It is a metamorphic solid.
Quartz is the most abundant silica mineral. Pure Quartz is colorless and transparent. It occurs in most igneous and practically all metamorphic and sedimentary rocks. It is used as a component of numerous industrial materials. Silicon (Si) has the atomic number 14 and is closely related to carbon. It is a relatively inert metalloid. Silicon is often used for microchips, glass, cement, and pottery. Silica is the most abundant mineral found in the crust of the earth. One of the most common uses of silica quarts is the manufacturer of glass. Quartz is the second most abundant mineral in the Earth's crust. Its chemical name is SiO2.
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(d) Caesium is another element in Group 1 of the Periodic Table.
(i) The table below lists some statements about the reaction of caesium with
cold water compared to the reaction of lithium with cold water.
Place ticks (✓) in the boxes to show the two correct statements.
the reaction with caesium is more vigorous
the reaction with caesium produces a different gas
the reaction with caesium produces an acidic solution
the reaction with caesium produces a different compound
the reaction of caesium is endothermic
Answer: The reaction with caesium is more vigourus.
The reaction with caesium produces different compund.
Explanation:
Cold water and cesium react to produce hydrogen gas and a mixture of cesium and hydroxide ions as byproducts.
A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5
The correct answer is: 9.08
Can someone explain how to do this for me?
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of this buffer is 5.14. pH is a unitless quantity.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
0.18 M =NH₃
0.27 M= NH₄Cl.
Kb of NH₃ = 1.8 × 10⁻⁵
pKb = - log (kb)
= - log (1.8 × 10⁻⁵)
= 4.74
Using Henderson equation
pH = Pkb +ln [ NH₄Cl ]/ [NH₃]
= 4.74 + ln (0.27 /0.18)
= 5.14
Therefore, the pH of this buffer is 5.14.
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In 25 years, how many observations have been made using the HST?
A. Over 100,00
B. Over 1 million
C. Over 1 billion
The correct answer is Option B
B. Over 1 million
What is 1 Million?
Find the distinction between the international place value system and the Indian place value system first. Afterward, determine the exchange rates between the Indian place value system and the universal place value system. To get the answer, write 1,000,000 in numeric form and convert it to Indian place value.
Finding the value of 1,000,000 and the number that this value of 1,000,000 equates to from the possibilities provided is our task in this question.
We must bear in mind that the worldwide place value system used in this issue is the one that employs millions, billions, etc. This system of place values is not used by us.
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this is the chemical formula for cassiterite (tin ore): a geochemist has determined by measurements that there are moles of tin in a sample of cassiterite. how many moles of oxygen are in the sample? round your answer to significant digits.
There are two moles of oxygen in cassiterite (tin ore), SnO2, for every mole of tin. As a result, if we have 13 moles of tin, we should have 13 * 2 moles of oxygen. This results in 26 moles of oxygen.
Cassiterite (SnO2) is the most essential tin ore, and it is frequently located in granite veins, granite pegmatites, and greisen. The name is derived from the Greek kassiteros, which means tin.
Cassiterite is a tin oxide mineral with the chemical formula SnO2. It is the primary significant source of tin, accounting for the majority of the world's supply. Primary cassiterite is found in trace amounts in igneous and metamorphic rocks all over the world. It is a mineral that can be found in soils and sediments. Cassiterite is more resistant to deterioration than many other minerals, so it is found in stream and shoreline sediments. Colors include black, brownish black, reddish brown, brown red, yellow, gray, and white.
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how many moles of zinc are in 4.20 kg of zinc? express your answer to three significant figures and include the appropriate units.
Make a fast conversion: Utilizing the molecular weight converter as well as the molar mass of Zn, 1 gram of zinc equals 0.015295197308045 moles.
The grams (g) number cancels when the molecular weight of the chemical, NaOH, is divided by the number of grams, leaving just the unit mol (moles). Utilizing the molecular weight converter as well as the molar mass of Zn, 1 gram of zinc equals 0.015295197308045 moles. In other words, mole ratio of carbon is exactly equal to 12 grams of carbon's atomic mass or weight. The average comparative atomic mass of an element is multiplied either by molar constant, 1 103 kg/mol = 1 g/mol, to determine the molar mass of its atoms. One mole of a substance contains 6.02 1023 molecules; this quantity is referred to as Avogadro's number.
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a beaker contains an aqueous solution of sodium acetate (nac2h3o2). a few crystals of sodium acetate are added to the beaker. they sink to the bottom of the beaker and appear unchanged even after further mixing. what can you conclude about the level of saturation of the solution?
a beaker contains an aqueous solution of sodium acetate (nac2h3o2). a few crystals of sodium acetate are added to the beaker. they sink to the bottom of the beaker and appear unchanged even after further mixing. This can't be supersaturated since no crystals were formed earlier
A beaker contains an unknown concentration of aqueous sodium acetate (NaC2H3O2). --> We only know that a salt is present; no information on solubility is provided. A few sodium acetate crystals are added to the beaker. They sink to the bottom of the beaker and stay there even after further mixing. --> If they sink completely, they are not soluble in water, indicating that they are already SATURATED. Because no mor salt can exist in aqueous/solution, this must be SATURATED. This cannot be supersaturated because no crystals were formed previously.
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which of the following has the lowest conductivity? a. 0.1 m cuso4 b. 0.1 m koh c. 0.1 m bacl2 d. 0.1 m hf e. 0.1 m hno3
The following has the lowest conductivity are the bacl2 that is 0.1 m as bacl2 is not good electrolyte.
Therefore BaCl2·2H2O is a great selec- tion for growing a polymer electrolyte in addition to for right ionic conductivity results.The molar conductivities at countless dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm2 mol–1 respectively.
BaCl2 can not behavior energy in fused kingdom due to the fact charged debris can not flow in the crystal. BaCL2 is less in conductivity as it has not any of the conductive character and thus cannot definitely says about the conductive.
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When a hammer strikes a nail, the nail
1. exerts balanced forces that helps it from moving.
2. exerts a force equal to the weight of the hammer.
3. exerts an unbalanced force that changes its velocity.
4. exerts an equal and opposite force back on the hammer.
When a hammer strikes a nail, the nail exerts an equal and opposite force back on the hammer. Option 4.
Newton's law of motionAccording to Newton's third law of motion, for every action, there is an equal but opposite reaction. In other words, for a resting object, there are two forces:
A force acting downward due to its mass and gravityA reactive force acting upward is exerted by the surface on which the object is resting.Newton's third law of motion can be mathematically expressed as:
F = ma
Where
F is the forcem is the mass of the objecta is the acceleration due to gravityNow, when we consider a nail being stroked by a hammer, the hammer is exerting a force on the nail. In accordance with Newton's third law of motion, the nail will also exert the same magnitude of force back on the hammer. This means that the force has to be in the opposite direction to the force exerted by the hammer.
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Please help with this:
Typically, hard water used in a lab class would have been prepared by adding 1 gram of
magnesium sulfate per liter of distilled water. Magnesium sulfate contains 20.2%
magnesium ions by mass. What is its hardness in grains per gallon (GPG)? (One GPG
equals 17.1 mg/L.)
One grain of calcium carbonate, or 64.8 milligrams, is dissolved in one US gallon of water to represent one grain per gallon (gpg), a measure of water hardness (3.785412 L).
What is Water Hardness Measurement Scales?Understanding your test findings necessitates familiarity with the many water hardness testing scales that are employed. The majority of results are provided as a number that indicates the amount of calcium carbonate or calcium carbonate equivalents present in a specific unit of water. Depending on the measurement method, this value may be given in grains per gallon (gpg), parts per million (ppm), or milligrammes per litre (mg/L).Per Gallon of Grains Measurement of water hardnessThe hardness scale, expressed in gpg of calcium carbonate, can be seen as follows, according to the Water Quality Association:Soft is defined as gpg less than 1.An intermediate level of difficulty is between 1 and 3.5 gpg.The category of fairly challenging ranges from 3.5 to 7 gpg.The hard range is between 7 and 10.5 gpg.It's regarded quite difficult to get above 10.5 gpg.To Learn more About grain per gallon refer to:
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How many grams of nitrogen gas are needed to completely react with 2.8 moles of hydrogen?
The amount of grams of nitrogen gas needed to completely react with 2.8 moles of hydrogen is 26.13 grams.
How to calculate mass?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, nitrogen gas completely reacts with 2.8 moles of hydrogen as follows:
N₂ + 3H₂ → 2NH₃
Based on the above equation, 1 mole of nitrogen gas reacts with 3 moles of hydrogen. This means that 2.8/3 moles = 0.933 moles of nitrogen will react with 2.8 moles of hydrogen.
moles = mass ÷ molar mass
mass = 0.933 moles × 28 = 26.13g
Therefore, 26.13 grams of nitrogen gas is required to react completely.
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what is the formal charge on phosphorus in a lewis structure for the phosphate ion that satisfies the octet rule?
The formal charge on phosphorus in a lewis structure for the phosphate ion that satisfies the octet rule is 0.
What is a Lewis structure?
All valence electrons are represented by Lewis structures, which are structural formulas for molecules and polyatomic ions. These structural formulas are commonly referred to as Lewis dot structures since valence electrons are frequently shown as dots.
Why is Lewis structure used?
Chemical bonds and atomic structures are examined and understood using Lewis structures. The type of bonds created between atoms using valence electrons or/and lone pairs, as well as the number of bonds an atom can or will form with other atoms, can all be determined using Lewis dot diagrams.
Lewis structure of phosphate (po43-) ion.Formal charge= no. of valence electrons - no. of non bonding valence electrons- [tex]\frac{total no. of bonded electrons }{2}[/tex]
Formal charge of P= 5-0-[tex]\frac{10}{2}[/tex] = 0
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14c has a half life of 5730 years. how many years does it take (roughly) for 14c to decay to 1/32 of the original concentration?
The half-life of 14C is currently estimated to be 5,730 years. Accordingly, just half of the original 14C will be present after 5,730 years, followed by a quarter after 11,460 years, an eighth following 17,190 years, and so forth.
The duration needed for a quantity to decrease to half of its original value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how lengthy stable atoms last. Additionally, the phrase can be used more broadly to describe any kind of exponential decay.
The basic idea behind radiocarbon dating is that all living creatures absorb carbon from their environment, including some naturally occurring radioactive carbon-14. Even though the plant or animal stops absorbing when it dies, the radioactive carbon it has stored keeps on degrading.
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a 25.00 ml sample of hydrochloric acid solutions requires 24.16 ml of 0.106 m sodium hydroxide for complete neutralization. what is the concentration of the original hydrochloric acid solution?
The concentration of original HydroChloric Acid or HCl we say, would be 0.102 M in the starting of Titration.
As the Acid-Base reacts to form water and salts this is an acid-base neutralization displacement reaction.
The reaction goes like :
NaOH + HCl ==> H2O + NaCl
As the reaction shows, that one mole of NaOH reacts with one mole of HCl which means these species react mole to mole and form one mole of Water and one mole of Salt.
Since we're titrating 24.16 ml of 0.106 M NaOH with 25 ml of HCl, the equation balances for 1 : 1 so, we can calculate the concentration of HCl using the following equation :
[tex]M_{NaOH} * V_{NaOH} = M_{HCl} * V_{HCl}[/tex]
24.16 * 0.106 = x * 25
=> x = 0.102 M
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Which of these pairs of elements would be most likely to form a molecular compound?
a.
P and Br
b.
Cu and K
C.
K and O
d.
O and Zn
e.
Al and Rb
Draw the Lewis structure for SF6 and then answer the following questions that follow.
-Do not include overall ion charges or formal charges in your drawing.
Questions:
1). What is the electron-pair geometry for S in SF6?
2). What is the shape (molecular geometry) of SF6?
SF6 molecular geometry will be octahedral because if we look at the structure sulphur hexafluoride has a central sulphur atom around which12 electrons or 6 electron pairs are present and there are no lone pairs.
What is SF6?Sulphur hexafluoride – also known as SF6 – is a ‘greenhouse gas’ that has long played a part in global warming, similar to that of carbon dioxide (CO2).CO2 has been a focal point of climate change for many years. Released from the burning of fossil fuels and other carbon-intensive practices, it creates a cover that traps heat from the sun in the earth’s atmosphere, warming the planet and the oceans. This is what’s known as the ‘greenhouse effect’.SF6 also has this effect, but is much more potent than CO2. Today, wider understanding of the potency of this gas – and the need to reach net zero carbon emissions by 2050 in order to tackle climate change – is causing a rethink of its use.To learn more about ‘greenhouse effect’ refer to:
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which list contains only strong acids? (5 points) a. hcl, hno3, hf, hclo4 b. h2so4, h3po4, hclo4, nh3 c. hno3, h2so4, naoh, h3po4 d. hcl, hno3, h3po4, hclo4 e. hcl, h2so4, hclo4, hi
a. hcl, hno3, hf, hclo4 b. h2so4 list contains only strong acids.
Chloric acid, hydrochloric acid, hydrochloric acid, hydroiodic acid, nitric acid, perchloric acid, and sulfuric acid are the 7 main acids. These are strong acids since they can completely dissociate in water. A strong acid is described as an acetone that completely disintegrates when added to water. Because the hydrochloric acid inside the preceding example donates every one of its protons to the remedy and totally dissolves, it is classified as a strong acid.
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whats the mass of 7.60×1020 H2O2 molecules
The mass of 7.60 × 10²⁰ hydrogen peroxide molecules is 0.043 grams.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by the molar mass of the substance as follows:
mass = molar mass × no of moles
However, the number of moles of a substance can be calculated by dividing the number of molecules of a substance by Avogadro's number;
no of moles = 7.60 × 10²⁰ ÷ 6.02 × 10²³
no of moles = 1.26 × 10-³ moles
molar mass of hydrogen peroxide = 34g/mol
mass = 34g/mol × 0.00126 moles
mass = 0.043 grams
Therefore, 0.043 grams is the mass of the hydrogen peroxide.
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"Archeologists wanted to determine how long ago in our past a civilization in South America existed. They found a bone of a human from that civilization and performed Carbon-14 dating. They found that 12.5% of the Carbon-14 was left, how old is that bone?
How far back in our past can we assume that civilization existed?"
Archaeologists found a bone of a human from that civilization and performed Carbon-14 dating. They found that 12.5% of the Carbon-14 was left, the estimated age of this sample is 17,151 years old.
What is the estimation of Archaeologists about carbon-14?Radiocarbon dating sometimes referred to as carbon-14 dating, has been used by archaeologists for a long time to determine an object's age. Traditional radiocarbon dating, which makes use of the fact that minute quantities of radioactive carbon may be found in the environment, is used to determine the age of organic remains that are 500–50,000 years old. Radiocarbon dating depends on that half-life. Since carbon-12 doesn't deteriorate, it serves as a reliable indicator of carbon-14's impending demise.
An isotope of carbon-14 that is older emits less radiation. Calculate how many half-lives have elapsed by multiplying the carbon-14 half-life (5,717 years). The amount of carbon-14 in this sample of wood reached 12.5% after 17,151 years. 3 half-lives have since gone.
The sample is therefore estimated to be 17,151 years old.
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which compound below has the lowest heat of hydrogenation? multiple choice 1,5-hexadiene 3,4-hexadiene (e)-1,4-hexadiene (e,e)-2,4-hexadiene
2-4 hexadiene is lowest heat compound of hydrogention .
What is chemical compound?A chemical compound is a substance that contains atoms from multiple chemical elements held together by chemical bond.
The compound with the smaller heat of hydration as follows- 2,3-dimethyl-2-hexene.
The structure of 3,4-dimethyl-2-hexene (A) is CH₃CH₂CH(CH₃)C(CH₃)=CHCH₃.
The structure of 2,3-dimethyl-2-hexene (B) is CH₃CH₂CH₂C(CH₃)=C(CH₃)₂.
The structure of 4,5-dimethyl-2-hexene (C) is CH₃CH(CH₃)CH(CH₃)CH=CHCH₃.
If you draw the structures, you find that A is a trisubstituted alkenes, B is tetrasubstituted, and C is disubstituted.
The order of stability of substituted alkenes.
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the epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart c. is always visible in all cardiac views d. all of the above e. a and b onl
The epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart.
It is the posterior fat pad that is a sign that indicates a pathology when one looks at an x-ray. When a crescent fat is observed in the x-ray, it indicates there is an elbow joint effusion since normally the posterior fat cannot be seen from the x-ray.
In radiography, X-rays are used to view inner parts of the body for medical observation, analysis and to know the treatment procedure to adopt.
When a non visible posterior fat pad on a well-exposed, then it generally suggests a negative study for injury. This means that the features observed are unrelated to any type of injury. This eliminates option c.
Therefore, only option a and b are correct that the epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart.
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if a sample of magnesium has a mass of 72.9 g, how many moles of magnesium does the sample contain?
Answer:
3 moles
Explanation:
Mg has molar mass of 24.31 g/mol
so 72.9 g / 24.31 g/mo = 3 moles
what is relative abundance isotopes
The relative abundance of isotopes is the number of atoms of a particular isotope divide by the total number of atoms of all isotopes of that element, multiplied 100 percent.
What is relative abundance isotopes?The relative abundance of an isotope is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.
Also relative abundances refers to the relative proportions of the stable isotopes of each element. They are most often quoted as atom percentages
To calculate the percent abundance of each isotope in a sample of an element, the number of atoms of a particular isotope is usually divide by the total number of atoms of all isotopes of that element and then multiply the result by 100 since it is expressed in percentage.
Mathematically, the formula for relative abundance is given as;
R.A = ( number of atoms of isotope / total number of atoms ) x 100%
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If an atom, such as hydrogen, is able to form a covalent bond, describe what happens when the
electron shells of two atoms overlap?
The potential energy between the nuclei is minimized and the orbital shells overlap.
What is a covalent bond?We know that a covalent bond is the kind of bond that is formed when there is the combination of two atoms when there is the overlap of the orbitals of the two atoms. In the case of the hydrogen atoms, we can say that there is a bond as we notice that the two atomic orbitals have become overlapped on each other.
Let us note that when the two atoms are still far from each other, the potential energy between the atoms is high and as such the atoms of the element would tend to repel each other.
As the two atoms begin to approach each other, the repulsion between the nuclei of the elements is seen to become minimized and the bond is now seen to be formed as the atomic orbitals become overlapped.
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