The complete balanced half-cell reaction is as follows:
Mg(s)+PdSO4(aq)---->MgSO4(aq)+Pd(s)
S1 solution= MgSO4 (magnesium sulfate) and S2 solution= PdSO4 (Palladium (II) sulfate)
A chemical reaction that takes place between an oxidizing substance and a reducing substance. The oxidizing substance loses electrons in the reaction, and the reducing substance gains electrons. Oxidation numbers, which are assigned to atoms in molecules by assuming that all bonds to the atoms are ionic. An increase in oxidation number during a reaction corresponds to oxidation, while a decreases corresponds to reduction.
Cathode: Pd^2+(aq)+2e- ---> Pd(s)
At cathode, reduction (gain of e- ) occurs.
At anode: Mg(s) ----> Mg^2+(aq)+2e-
Anode, oxidation (loss of e-) occurs
E1= Mg; (as left side of cell is anode)
E2= Pd; (as right side of cell is cathode)
S1 solution= MgSO4 (magnesium sulfate)
S2 solution= PdSO4 (Palladium (II) sulfate)
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curved arrows are used to illustrate the flow of electrons. follow the arrows to predict the intermediate and product of reaction nah
The arrows are used to illustrate the flow of electrons. follow the arrows to predict the intermediate and product of reaction , the product is :
CH₃ - C -CH₃ + H₂O + ⁻OCH₃
||
O
The reaction is in between the 2 methoxypropan-2-ol and the hydroxide ion. the OH⁻ ion is the strong nucleophile and contain the negative charged. the hydroxyl group acts as a proton of the compound is acidic because of the electronegativity difference. the hydroxyl ion takes protons and form the water.
The reaction is given as follows :
OH
|
CH₃ - C - OCH₃ + OH⁻ ----> CH₃ - C -CH₃ + H₂O + ⁻OCH₃
| ||
CH₃ O
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PLEASE HELP!!!
1. SEP Develop Models
Use the space to draw electron dot structures to model the bonding in calcium oxide (CaO), calcium chloride (CaCl₂), and potassium nitride (K₂N). As you develop your models, consider the following: Use the diagram for NaCl as a guide for your electron dot structures. After the bond is formed, each ion should have a complete outer electron shell, and the overall charge on the compound should be zero.
Answer:
Calcium Oxide must be Ionic, as we have one metal and one non metal involved. the metal is Calcium and the non metal is Oxygen. Meaning Calcium must be the one that transfers (loses) electrons to Oxygen, and Oxygen gains these electrons. It would look something like this:
Because Calcium transfers 2 electrons, it now has 2 more positively charged protons than the total number of electrons, as two electrons are lost. this means Calcium is no longer an atom, as it's positive protons and negative electrons can't cancel and make it neutral, it is now an ion, and a positively charged one at that. Same thing applies for Oxygen, but the opposite. because it has 2 more negative electrons than it's total of positive protons, it is now also an ion, and a negative one at that. The diagrams provided show the charges of the ions.
Potassium Nitrate must also be Ionic, for the same reason as before. the metal is Potassium and the non metal is Nitrogen. However, because Potassium is in Group 1, it only has 1 electron it can transfer to Nitrogen, but Nitrogen needs 2 electrons for a full outer energy level, therefore, we must have two Potassium atoms in this equation. It would look something like this:
Because there are two Potassium ions, each with a +1 charge, this means the overall charge of the Potassium ions is 2+, and this cancels out with the 2- provided by one ion of Nitrogen
which of the following is not a network solid? selected answer: correctc. co2(s) correct answer: correctc. co2(s)
We were aware that SiO2 is a network covalent solid and that CO2 is a molecular solid, but I'm not sure how I would go about determining that.
Each silicon and carbon have the same number of valence electrons, and they both contain two oxygen atoms. Because solid sulfur dioxide is a molecule and has covalent bonds, it is not a network solid even if it is a solid and has covalent bonds. An example of a network solid is diamond. One of the many forms of elemental carbon found in nature, diamond is an allotrope of carbon. On an atomic level, it resembles this. The carbon atoms are linked together by the lines.
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How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid?
Answer: To determine how many grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid, we can use the balanced chemical equation for the reaction:
CaCO3 + 2 HCl -> CaCl2 + H2O + CO2
From the equation, we can see that for every mole of calcium carbonate that reacts, one mole of calcium chloride is produced. We can use the molar masses of each compound to convert the number of grams of each reactant to moles, and then use the mole ratios from the balanced chemical equation to determine the number of moles of calcium chloride produced.
The molar mass of calcium carbonate is 100.09 g/mol, so 27.0 g of calcium carbonate is equal to 0.269 moles. The molar mass of hydrochloric acid is 36.46 g/mol, so 11.0 g of hydrochloric acid is equal to 0.302 moles.
From the balanced chemical equation, we can see that for every mole of calcium carbonate that reacts, two moles of hydrochloric acid are needed. This means that we have an excess of hydrochloric acid, and the limiting reactant in this reaction is calcium carbonate. Therefore, the number of moles of calcium chloride produced will be equal to the number of moles of calcium carbonate consumed, which is 0.269 moles.
To determine the mass of calcium chloride produced, we can multiply the number of moles of calcium chloride by its molar mass. The molar mass of calcium chloride is 110.98 g/mol, so the mass of calcium chloride produced is 0.269 moles * 110.98 g/mol = 29.8 g.
Therefore, when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid, 29.8 g of calcium chloride will be produced.
a valid lewis structure of cannot be drawn without violating the octet rule. group of answer choices nf3 so42- pf3 sbf3 if3
A valid lewis structure of cannot be drawn without violating the octet rule is IF₃.
According to the octet rule the atoms will be more stable if the valence electrons in the valence are eight electrons.
a) NF₃ = in the lewis structure of NF₃ the atom will contains the eight valence electrons in the valence shell. thus it follows the octet rule.
b) SO₄²⁻ = SO₄²⁻ , lewis structure follows the octet rule . atoms contains the eight valence electrons.
c) PF₃ = phosphorus valence electrons is 5 and the fluorine valence electron is 7 and fulfil the octet rule.
d) IF₃ = in the lewis structure IF₃ , it does not follows the octet rule . it contains the more than eight electrons .
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Which of the following is an observation of a chemical property?
Ozinc reacts with hydrochloric acid
density of wood is 0.51 g/cm³
water boils at 100°C.
sand paper is roughly textured
The right answer to the previous question and the correct observation of a chemical property is that zinc reacts with hydrochloric acid.
ZnCl2 +H2 = Zn +2HCL
Balanced equation:
ZnCl2 + H2 Zn + 2HCL
Zinc is a chemical element, designated by the symbol Zn and the atomic number 30. When the oxidation is removed, zinc turns shiny-greyish and at room temperature turns into a somewhat brittle metal.
All living things, including people, animals, plants, and microorganisms, depend on the trace metal zinc. It is the trace metal that is present in people in the second-highest concentration after iron. Zinc is an essential nutrient for development and a key cofactor for various enzymes. A lack of zinc can lead to a variety of diseases. Deficiency can lead to diarrhoea, infection susceptibility, and slower growth.
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in the dehydrohalogenation of 2-bromobutane which conformation below leads directly to thr formation of cis-2-butene
The conformation below in the dehydrohalogenation of 2-bromobutane results in the immediate production of cis-2-butene.
Dehydrohalogenation in chemistry is an elimination process that eliminates a hydrogen halide from a substrate. Although the reaction is frequently linked to the synthesis of alkenes, it has other uses as well.
A hydrogen halide is eliminated (removed) from a substrate during a dehydrohalogenation reaction. Although the reaction is frequently linked to the synthesis of alkenes, it has other uses as well.
The type of atoms or groups of atoms that leave the molecule serves as a frequent indicator of elimination reactions. Dehydrohalogenation, for instance, is the removal of a hydrogen atom along with a halogen atom; dehalogenation is the removal of two halogen atoms. Dehydration, on the other hand, is the removal of a water molecule, typically from alcohol.
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a concept map for four types of intermolecular forces and a certain type of bond is shown. an ellipse is shown. inside the ellipse is written are ions present. an arrow from the right side of the ellipse has yes written on it and points to another ellipse. this ellipse has are polar molecules present written inside it. this ellipse has two arrows coming out of it. one arrow has yes written on it and leads to a rectangular box that has d written inside it. the second arrow has no written on it and leads to a rectangular box that has e written inside it. an arrow from the left of the topmost ellipse has no written on it and leads to an ellipse that has are molecules with permanent dipoles present written on it. an arrow that has no written on it, points from this ellipse towards a rectangle that has a written inside it. an arrow that has yes written on it, points from this ellipse towards another ellipse that has is h atom bonded to f, o, or n atom written on it. this ellipse also has two arrows coming from it. the arrow with yes written on it leads to a rectangle that has c written on it and the arrow that has no written on it leads to a rectangle that has b written inside it. which of the following correctly identifies the intermolecular force represented by a and compares its strength relative to the intermolecular force represented by b? a represents london dispersion forces, which are weaker than the force represented by b. a represents hydrogen bonding, which is weaker than the force represented by b. a represents london dispersion forces, which are stronger than the force represented by b. a represents hydrogen bonding, which is stronger than the force represented by b.
The letter A represents the dispersion forces as a kind of intermolecular force. Option A
What is a concept map?We know that a concept map can be regarded as the framework that is used to be able to organize facts and then be able to pass across an information. Thus a concept map is a tool that helps in the explanation of facts.
Given that we can see from the concept map that the compound is not composed of ions and there are no permanent dipoles that can be seen in the molecule, the simple meaning is that there is no kind of intermolecular interaction that involves the attraction of the oppositely charged ions in the compound and this would correspond to the dispersion forces.
In this kind of dipole attraction, it is the intermittent shifts in the electron cloud that leads to the attraction.
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What is the concentration in ppb of sulfur atoms if 120.0g of water is mixed with 0.00005g of sulfur
Answer:
the ppb ratio of sulfur atoms is 1/250.
Explanation: i do math for livin cuh
Water boils at 100 degrees Celsius. What is the boiling point for water on the Kelvin scale? K = °C + 273 and °C = K - 273
Answer:
the answer is 373
Explanation:
K=°C + 273
K=100+273=373
when applied research is conducted in settings outside the laboratory, which of the following can be a problem?
when applied research is conducted in settings outside the laboratory, the focus on a specific real world problem can be a problem.
The configuration and contents of laboratories are determined by the diverse needs of the specialists that work inside. A laboratory might have a particle accelerator or a vacuum chamber, whereas a metallurgy lab might have tools for casting, refining, or evaluating the strength of metals. A psychologist would utilise a room with one-way mirrors and covert cameras to examine behaviour in their lab, whereas a biologist or chemist might employ a wet laboratory. In laboratories, such as those where computer scientists typically operate, computers (and occasionally supercomputers) are sometimes utilised for either simulations or data processing. Scientists in other professions will continue to use a variety of labs. In laboratories, engineers build, assemble, and test technical objects.
The complete question is:
when applied research is conducted in settings outside the laboratory, which of the following can be a problem?
a. examines the basic laws of human behavior
b. is just as likely to occur in the laboratory as in the field
c. focuses on a specific real world problem
d. has no connection with theory
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suppose of ammonium sulfate is dissolved in of a aqueous solution of sodium chromate. calculate the final molarity of ammonium cation in the solution. you can assume the volume of the solution doesn't change when the ammonium sulfate is dissolved in it. round your answer to significant digits.
The final molarity of the ammonium cation in the solution is 0.066M.
Firstly, we need to calculate the number of moles of ammonium sulfate:
No of moles = mass(g)/molar mass
No of moles = 2.57/132.14
No of moles = 0.0195 mol
When ammonium sulfate dissolves in sodium chromate, the following reaction will take place:
(NH₄)₂SO₄ + Na₂CrO₄ ------> (NH₄)₂CrO₄ + Na₂SO₄
No of Moles of sodium chromate = molarity x volume
= 66 x 0.200
No of moles of Sodium Chromate = 0.0132 mol
According to the reaction, 1 mol of sodium chromate produces 1 mol of ammonium chromate.
In this reaction, the sodium chromate amount is less than ammonium sulfate.
It can be concluded that Sodium chromate is a limiting reagent.
Therefore 0.0134 mol of ammonium cation is present in the resulting solution.
Molarity of ammonium cation = 0.0134 mol / 0.2 L
Molarity = 0.066 M
Therefore, 0.066M is the Molarity of the ammonium cation.
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a buffer solution with a ph of 4.31 is prepared with 1.0 m hc2h3o2 and --------m nac2h3o2. the ka of hc2h3o2 is 1.8 x 10^-5.
The concentration of sodium acetate (NaC₂H₃O₂) in the buffer solution is: 0.029 M.
What is a buffer solution?A buffer solution is a solution that is resistant to changes in pH when small amounts of an acid or a base are added to it. It is able to do this because it contains both a weak acid and its conjugate base (or a weak base and its conjugate acid).
To determine the concentration of sodium acetate (NaC₂HO₂) in the buffer solution, you can use the Henderson-Hasselbalch equation:
pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])
where [C₂H₃O₂-] is the concentration of the acetate ion (the conjugate base of acetic acid) and [HC₂H₃O₂] is the concentration of acetic acid.
So, Plugging in the given values, we get:
4.31 = -log(1.8 x 10^-5) + log([C₂H₃O₂-]/1.0)
Solving for [C₂H₃O₂-] above, we see that it is = 0.029 M.
Since the concentration of sodium acetate is equal to the concentration of acetate ions, the concentration of sodium acetate in the buffer solution is also 0.029 M.
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See full question below
determine the concentration of sodium acetate (NaC₂H₃O₂)) in the buffer solution below.
a buffer solution with a ph of 4.31 is prepared with 1.0 m hc2h3o2 and --------m nac2h3o2. the ka of hc2h3o2 is 1.8 x 10^-5.
state amagats law of combining volume, giving both mathematical and graphical representation
According to the amagats law , the total pressure that is occupied by a gas is a sum of its partial volumes.
What is the volume of a gas?
We know that the volume of a gas has to do with the space that is being occupied by the gas. This is actually the physical space that has been taken up by the gas.
We know that a gas takes up the entire volume of the container. The volume of the container that is taken up by each of the gasses that can be found in a given mixture of gases is not the same.
As such we can be able to speak of the partial volume of a gas which is the space that the gas is able to take up in a mixture of gasses. This is the fraction of the volume of the container that has been occupied by the particular gas that is in question.
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cobalt- is radioactive and has a half life of years. how much of a sample would be left after years? round your answer to significant digits. also, be sure your answer has a unit symbol.
Cobalt-60 is radioactive and has a half life of 5.26 years . amount of 3.60 mg sample would be left after 5.20 years is 1.82 mg.
The half-life t1/2 = 5.26 years
the decay constant , k = 0.693 / t1/2
= 0.693 / 5.26
= 0.1317 / year
the expression is given as :
t = 2.303 / k log No/N
No = 3.60 mg
t = 5.20 yr
5.20 = 2.303 / 0.1317 log 3.60 / N
5.20 = 17.4 log 3.60 / N
log 3.60 / N = 0.2988
3.60 / N = 1.989
N = 1.82 mg
The question is incomplete , the complete question is :
cobalt- is radioactive and has a half life of years. how much of a sample would be left after years? round your answer to significant digits. also, be sure your answer has a unit symbol.
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match each process of the nitrogen cycle with the form of nitrogen that is produced. labels may be used more than once.
Matching each process of the nitrogen cycle with the form of nitrogen that is produced is combustion: NO2; decomposition: NH4+; nitrogen fixation: NH4+; denitrification: N2; and nitrification: NO3-.
The nitrogen cycle refers to the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it moves among terrestrial, atmospheric, and marine ecosystems. It is a repeating cycle of processes during which nitrogen circulates through both living and non-living things: the atmosphere, soil, water, plants, animals, and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms. The conversion of nitrogen can be carried out through both biological and physical processes. The nitrogen converts into NO2 through stationary combustion and into NH4+ through decomposition. Fixation converts nitrogen in the atmosphere into forms that plants produce i.e., NH4+. Denitrification is the process that converts nitrate to nitrogen gas, producing N2. Nitrification is the process that converts ammonia to nitrite and then to nitrate producing NO3-.
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The Cori cycle is a metabolic pathway that involves active muscles and the liver. fatty acids glucose → glucose glycolysis → ATP gluconeo- genesis ATP CO2 + H2O lactate lactate LIVER MUSCLE Complete the sentences about the Cori cycle. Muscles break down into , which undergoes glycolysis. The end product of glycolysis in active muscles is , which is transported in the blood. The liver uses energy from to drive The produced in the liver is transported to the muscle in the bloodstream. Answer Banklactate pyruvate fatty acid oxidation glycolysis glycogen gluconeogenesis glucose
The process of moving lactate from cells that are engaged in anaerobic metabolism to the liver, where it is used to deliver glucose back to the cells, is known as the Cori cycle.
It serves as an illustration of one of the vital functions of the liver in ensuring that the body has an adequate supply of glucose. Gluconeogenesis has examples like the Cori cycle. It is true that the Cori cycle uses the liver's gluconeogenesis to change the lactate that muscles create into glucose. To be utilized by other cells throughout the body, this freshly created glucose is discharged into the blood. The Cori cycle, which transforms lactic acid into Glycogen, which can be used as a source of energy, prevents the excessive accumulation of lactic acid.
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at a certain temperature, the equilibrium constant for the following reaction is : h2(g) cl2(g)use this information to complete the following table.
At a certain temperature, the equilibrium constant for the reaction is 263.16 or 2.6*10^2 and 5.5 * 10^-8.
1. K = ( HCl )^2 / (H2)*(Cl2)
As the value of K is very less so HCl is very less amount and H2 & Cl2.
2. 2HCl = H2 + Cl2 as the reaction is reverse so equilibrium value will be inverse.
K' = 1/K
= 1/ 0.0038
= 263.16 or 2.6*10^2
3. 3H2 + 3 Cl2 = 6 HCl
Reaction is multiplied by 3 so K will be Cube
K' = K^3
= (0.0038)^3
= 5.5 * 10^-8
Equilibrium, in physics, the state of a system when neither its state of motion nor its internal energy state tend to change over time. A simple mechanical body is in equilibrium when it experiences neither linear nor angular acceleration. This state will continue indefinitely unless disturbed by an external force.
Equilibrium occurs for a single particle when the vector sum of all forces acting on the particle is zero. A rigid body (which by definition differs from a particle by its properties of extension), in addition to the states listed above for particles, is in equilibrium when the vector sum of all torques acting on the body is equal to zero, so Its state of rotational motion remains constant.
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Is this ammonia a polar or non polar molecule
Design a synthesis of 2-ethyl-2-hexenoic acid from alcohols of four carbons or fewer alcohols containing 4 carbons or fewer
The enolates are the anions from the ketones. synthesis of 2-ethyl-2-hexenoic acid from alcohols of four carbons is :
butan - 1 - ol ------> 2-ethyl-2-hexenoic acid
The enolates ions will acts as a nucleophile in the SN² reaction . The alkyl group will replace the alpha hydrogen and then the carbon carbon new bond is formed . synthesis of 2-ethyl-2-hexenoic acid from alcohols of four carbons is given as :
CH₃ - CH₂ - CH₂ - CH₂ - OH + PCC --- > CH₃ - CH₂ - CH₂ - C - H
||
O
+ NaOH ----> CH₃ - CH₂ - CH₂ - CH = C - C - H
| ||
C₂H₅ O
+ H₂CrO₄ -----> CH₃ - CH₂ - CH₂ - CH = C - C - OH
| ||
C₂H₅ O
2-ethyl-2-hexenoic acid
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Briefly describe each layer of Earth.
The layers of the earth include the following;troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It's explanation will be discussed below.
What are the layers of the earth?The layers of the earth are grouped into five major layers that includes the following:
Troposphere: This is the layer of the earth that is closest to the earth's surface. It is characterized by having 78% nitrogen, 21% oxygen and remainder of trace gases (carbon dioxide, ozone, hydrocarbons, argon).
Stratosphere: This layers is located immediately above the troposphere. This layer is where ozone formation occurs and it's suitable for flying jets. It can be said that the stratosphere helps to protect us against ultraviolet rays of the sunlight.
Mesosphere: This is the layer found immediately above the stratosphere. This layer is characterized by having internal atmospheric gravity waves.
Thermosphere: This is the layer that is found immediately above the Mesosphere. It has the ability to absorb the sun's radiation.
Exosphere: This is the layer that is found immediately above the thermosphere. There is accumulation of the lightest gases such as hydrogen and helium in this layer.
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the number of electrons in a neutral atom of an element is always equal to the of the element.
The number of electrons on a neutral atom is equal to the number of protons in the atom's nucleus, hence the answer is protons. This is referred to as the Z atomic number.
Atoms are neutral, hence there are exactly as many protons as electrons in each atom. All hydrogen atoms contain one electron, which is located outside the nucleus.
The number of protons and electrons in an atom's stable state is always equal to the atomic number. for a steady atom
Protons are positively charged and electrons are negatively charged. The number of electrons and protons in a neutral atom are always equal. The quantity of protons is constant.
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Define the following: Renwable energy and non-Renwable energy.
A resource can be classified as renewable or nonrenewable based on whether it can replace itself at the rate it is used up or whether it has a finite supply.
What exactly is renewable energy?Energy obtained from natural resources that are renewed more quickly than they are used up is referred to as renewable energy. Such sources that are constantly replenished include the sun and the wind, for instance. Non-renewable energy comes from energy sources that will ultimately exhaust themselves or cannot be regenerated, not even after countless ages. Fossil fuels, such as petroleum, natural gas, and coal, are the non-renewable energy sources that are most often used.A resource can be classified as renewable or nonrenewable based on whether it can replace itself at the rate it is used up or whether it has a finite supply. Timber, wind, and solar power are examples of renewable resources, whereas coal and natural gas are examples of non-renewable resources.To learn more about Renewable energy refer to:
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Oil and methane hydrates are both physical ocean resources found beneath the seafloor. List two other similarities between oil and methane hydrates.
Crude oil is a mixture of nitrogen, sulphur, oxygen, and volatile hydrocarbons. Methane hydrate is a particular kind of clathrate made up of water and low molecular weight gases like methane.
Fossil deposits under the seafloor are what make up oil. It is an organic chemical that was created by the deposition of organisms on the seafloor. Additionally, methane hydrates are created after marine creatures deposit. Under the ocean's surface, one can find both oil and methane hydrates.
Similarities between both the Oil and methane hydrates are :
They both came from the ocean floor.They come from fossil fuels.They are created by decaying aquatic life.They are an energy source that is not renewable.They were mostly made of hydrogen and carbon.Both contribute to climate danger.Under high pressure and low temperature, they solidified.To learn more about Oil and methane hydrates refer here
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a 94.0 ml solution of 0.200 m of agno3 reacts with 195.0 ml solution of 0.201 m of nacl to produce silver chloride (agcl) and sodium nitrate (nano3) according to the balanced equationAgNO3 (aq)NaCI(aq) AgCl(s) NaNO3(aq) Determine the limiting reactant for the given reaction O NaCl O AgNO3 O AgCl O NaNO3
NaCl is the limiting reactant in the given reaction.
You must figure out how many moles of each reactant are present to identify the limiting reactant. Utilizing each solution's concentration and volume can help you achieve this.
You have a volume of 94.0 ml and a concentration of 0.200 M for the AgNO3 solution. The AgNO3 solution has a volume of 0.094 liters after being converted from milliliters to liters by dividing by 1000 ml/L. The number of moles of AgNO3 may then be determined by dividing the concentration by the volume:
moles AgNO3 = concentration × volume
= 0.200 M × 0.094 L
= 0.0188 moles
You have a volume of 195.0 ml and a concentration of 0.201 M for the NaCl solution. The NaCl solution has a volume of 0.195 L after being multiplied by 1000 ml/L to convert the volume to liters. The number of moles of NaCl may then be determined by dividing the concentration by the volume:
moles NaCl = concentration × volume
= 0.201 M × 0.195 L
= 0.0401 moles
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Which of the following equations represents a reaction for which the standard entropy change is positive?
a) 3 O₂(g) --> 2 O₃(g)
b) 2 H₂(g) + O₂(g) --> 2 H₂O(l)
c) CaCO₃(s) --> CaO(s) + CO₂(g)
d) I₂(g) + 2 K(s) --> 2KI(s)
The correct response is A) The change in gaseous moles n g must be largest, indicating the formation of more gaseous products, which enhances unpredictability and, hence, entropy positive.
Entropy increases as a substance transitions from a solid to a liquid to a gas, and by observing the phases of the reactants and products, you can determine if an entropy change is positive or negative. Entropy will rise once the number of gas moles increases. The environment's negative entropy change is significantly outweighed by the system's positive entropy change. We can see that the system's entropy change is positive.
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Why the sulphides precipitate of group IIA should be washed with distilled water and then centrifuged before addition of dilution solution of HNO3?
Because of the fact that certain ions and impurities are adsorbed on the precipitate's surface. Precipitate is washed with tap water in order to eliminate these contaminants since water will wash away any pollutants that are still soluble in it.
Why are ions formed?Ions are electrically charged particles that may be produced by either taking electrons away from neutrality atoms to form positive ions or adding electrons to neutral atom to form negative ions. The quantity of protons remains constant during the creation of an ion.
Are ions a form of energy?Negative ions are believed to trigger biochemical processes that enhance serotonin levels once they enter our blood, which helps to reduce depression, reduce stress, and improve energy.
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What is the mass of the oxygen used during the reaction? Iron (19.43) and iron oxide (20.91).
The mass of the oxygen used during the reaction is 8.16 g
What is oxygen ?The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.
The reaction is as follows ,
4Fe + 3 ⇒ 2
The molar ratio of the reaction
= 4:3
The four moles of Fe react with 3 moles of oxygen molecule to produced Iron Oxide .
The mole of iron = mass ÷ molar mass
= 19.43 g ÷ 55.845 g/mole
= 0.34 mole
If four moles of Fe react with 3 moles of oxygen molecule to produced Iron Oxide .
The number of moles of oxygen
= 3 moles × 0.34 mole ÷ 4 moles
= 0.22 mole
The mass
= 0.22 × 32
= 8.16 g
Thus, The mass of the oxygen used during the reaction is 8.16 g
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Copper is a metal that can behave like a magnet because
A. It has many magnetic domains oriented randomly
B. It has a very large magnetic domain pointing in a given direction
C. It is a conductor and can support electric current.
D. It has two large magnetic domains that always cancel each other out.
Copper is a metal that can behave like a magnet because It is a conductor and can support electric current.
What is a definition of metal?
Strong electrical and thermal conductivity, malleability, ductility, and high light reflection are all characteristics of metals, which are one type of materials.
Copper is not magnetic in and of itself. However, when a magnet comes close to copper (and some other metals), the magnetic field causes the copper's surface electrons to reorganize and start revolving. They generate resistance by rotating in a circular motion perpendicular to the magnetic field.
Copper has the highest conductivity among non-precious metals, which means it can carry more electrical current than other non-precious metals.
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a molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. this is a statement of . group of answer choices the law of conservation of mass the law of constant composition the law of conservation of energy none of the above the law of multiple proportions
A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. this is a statement of the law of constant composition. Option B.
A water molecule is composed of hydrogen atoms and oxygen atoms bonded in a 2:1 ratio. Due to their fixed mass ratios, water molecules obey the law of constant proportions. Another example of a compound that obeys the law of constant ratios is methane.
To illustrate this, consider the production of water from molecular oxygen and hydrogen. Therefore mass is conserved. Conservation of mass can be used in chemical calculations. The law of conservation of mass states that matter cannot be created or destroyed.
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