Answer:
Answer: molar mass of NaCl is 58.5 gm/mol. This refers to the fact that 1 mole of NaCl weighs 58.5 gram.
Explanation:
Engineering chemistry
Answer:
it wont let me see it
Explanation:
which best describes how heat energy moves within the system?
Answer: B
Heat always travels from warmer areas to cooler areas in the form of radiation or convection currents due to the temperature difference. You could kind of think of this movement like diffusion: travelling from a higher concentration to a lower one (if you take biology). This is how a gas heats up a pan on the stove or a radiator warms a room
Convert 21 grams of radon into atoms of radon.
Answer:
The atomic mass of radon is 222.
Explanation:
. That means that one mole of radon weighs 222 grams (222 grams/moles). We can therefore make the following equation:
Grams × (1/222) = Moles of Radon
giving brainly for correct answer! :)
Answer:
Mass is the amount of matter in an object
Answer:
Mass
Explanation:
matter is weighed by the mass of an object
When performing an experiment, the following footwear is best
Answer:
sneakers
Explanation:
Answer:
closed toe shoe
Explanation:
becusae if a cemcal spills it cant hurt your feet
what is a nucleus and what are the functions?
How would you gather data to in order to determine the density of a marble
The average mass of a marble can be determined by dividing the total mass of the marbles by the total number of marbles: average mass of a marble.
To find the density of any object, you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density.
Use the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V).
To determine the density of a marble, we must know its mass and volume.
In order to determine the density of any substance we need to know its mass and volume.
Let's understand "Density".
The density of a substance is its mass per unit volume. It is represented with "ρ" this symbol.It can be given by the formula which is shown below: ρ= [tex]\frac{m}{V}[/tex] where m is the mass of the substance and V is the volume.Density indicates how much of a substance occupies a specific volume at a defined temperature and pressure. The density of a substance can be used to define the substance.Learn more:
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An exothermic reaction releases 86.5 kJ. How many kilocalories of
energy are released?
Mixture of a 25.00 mL aliquot of the sample solution with 5.00 mL of a 0.250 ppm warfarin standard yielded a solution with an intensity of 670. Calculate the percentage of warfarin in the sample.
Answer:
750
Explanation:
The formation of aluminum chloride can be described by the balanced chemical equation. 2Al+3Cl2⟶2AlCl3 How many moles of Cl2 molecules are required to react with 3.90 mol Al atoms? moles of Cl2 required
Which of the following is a compound? *
A. aluminum
B. carbon
C. oxygen
D. sugar
Answer:
C. OXYGEN
Explanation:
if 10.5 grams of liquid water is boiled how many grams of water vapor will then form ?
Answer:
It depends
Explanation:
This could vary depending on the exact temp, time and minerals. something with alot of salt boils quicker than something without it, so 10.5 grams?
The particular temperature, the passage of time, and the minerals could all affect the amount of grams of liquid water.
What are minerals?Minerals are defined as a naturally crystallized element or chemical compound that was created through geological processes. Natural materials are those that form on their own, such as minerals. Minerals don't droop, melt, or evaporate since they are solids. In contrast to the carbon compounds found in living organisms, minerals are inorganic. Minerals are crystalline: They have a unique atomic composition and arrangement.
Temperature is defined as a measure of hotness or coldness expressed in terms of any number of arbitrary scales that shows the direction that heat energy will naturally flow, i.e., from a hotter body to a colder body. The three temperature scales that are now in use are Kelvin, Celsius, and Fahrenheit. Food, beverages, agriculture, and medical care for both people and animals all depend heavily on temperature.
Thus, the particular temperature, the passage of time, and the minerals could all affect the amount of grams of liquid water.
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The city council of a small town wanted to add fluoride to their water so that all the residents would have healthier teeth. The mayor had read that ionic compounds must be used to get the fluoride into water. He looked up fluorine-containing compounds and came up with the following list.
NaF NF3 SiF4 CaF2 NH4F
Using academic vocabulary in paragraph form, discuss the following:
Explain which compound(s) could produce fluoride ions in the water. In your response, be sure to include:
° which of the listed compounds are ionic and which are covalent.
° how ionic and covalent compounds are different.
° why only ionic compounds would produce fluoride in water.
Answer:NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.
The compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].
The ionic compounds are formed by the transfer of electrons between the atoms of the compounds. The ionic bonds are weaker and are easy to dissociate in the aqueous solution.
The covalent compounds are formed by the sharing of electrons between the atoms. Since there is sharing, there has been a strong bond, that has been hard to dissociate.
The Mayor has to release Fluoride in the water, thus ionic compounds are preferred that have the easy release of fluorine.
From the given compounds:
NaF = Ionic compound[tex]\rm NF_3[/tex] = Covalent compound[tex]\rm SiF_4[/tex] = Ionic compound[tex]\rm CaF_2[/tex] = Ionic compound[tex]\rm NH_4F[/tex] = Ionic compoundThus the compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].
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When hydrogen sulphide is burnt in oxygen to form sulphur(is) oxide and what. How does the oxidation number of sulphur change?
Answer:
Explanation:
Hydrogen sulphide burns in air to form sulphur dioxide: 2H2S + 3O2 → 2H2O + 3SO2. In this reaction, the sulphur is oxidized from -2 to +4. In the reaction H2S + 2O2 → H2SO4 + 790 kJ/mol, the oxidation is from -2 to +6.
When hydrogen sulphide is burnt in oxygen to form sulphur dioxide and water (H₂O), the oxidation number of sulfur changes from -2 in H₂S to +4 in SO₂.
When hydrogen sulfide (H₂S) is burnt in oxygen (O₂) to form sulfur dioxide (SO₂) and water (H₂O), the oxidation number of sulfur changes from -2 in H₂S to +4 in SO₂.
The balanced chemical equation for the reaction is:
2 H₂S + 3 O₂ → 2 SO₂ + 2 H₂O
In hydrogen sulfide (H₂S), sulfur has an oxidation number of -2 because hydrogen has an oxidation number of +1, and the overall molecule is neutral (since it is uncharged).
In sulfur dioxide (SO₂), sulfur has an oxidation number of +4 because oxygen has an oxidation number of -2, and the overall molecule is neutral.
The change in the oxidation number of sulfur can be seen as follows:
H₂S (initial state) → SO₂ (final state)
-2 (initial oxidation number of sulfur) → +4 (final oxidation number of sulfur)
During the reaction, sulfur is oxidized from an oxidation state of -2 in hydrogen sulfide to +4 in sulfur dioxide. This means that sulfur loses electrons during the reaction, leading to an increase in its oxidation number. The oxygen molecules in the oxygen gas (O₂) act as the oxidizing agent, causing sulfur to undergo oxidation and form sulfur dioxide.
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11. Which is the solubility product expression for Na3PO4(s)?
Answer: B
Explanation: the 3 in Na3PO4(s) belong to the sodium atom (Na). so in any of these equations, the 3 would have to be with Na.
A- the 3 is along w the PO4, which would make it part of that bond
C- there is no 3 at all for Na in this choice, making it incorrect
D- Again, the 3 is placed on the other half of the bond
How many peaks will you observe in the 13C spectrum of cyclohexane ?
1 1 - incorrect
3
6
3 peaks
Explanation:
You can do this perfectly well without referring to chemical shift tables at all. In the spectrum there are a total of three peaks - that means that there are only three different environments for the carbons, despite there being four carbon atoms.
The chart below lists data on four different projects designed to restore a wetlands habitat destroyed by human activity and a recent hurricane.
The project that will be chosen will have to be low in cost, benefit the greatest number of species, and be popular with the local citizens whose taxes will sponsor it. Based on the data and the criteria given,which project will be chosen?
Answer:
Project 3.
Explanation:
Project 3's anticipated cost is 12 to 17 million dollars. It is a lower anticipated cost than Project 2 and Project 4, but higher than Project 1 by one million dollars at maximum cost anticipation. Additionally, the percentage of wildlife to benefit is 70-80%, which is second to the most wildlife to benefit which is Project 4 at 75-80%.
And finally, for community support for Project 3 - the chart lists it as high. This outclasses Project 2 and Project 4, but balances with Project 1. However, Project 1 costs 13 to 16 million dollars and only benefits 15-25% of wildlife.
Lattice energy is_______________ proportional to the distance between two ions in an ionic compound; therefore, the compound with the smaller lattice energy will have the _________________ distance between the ions.
Lattice energy is inversely proportional to the distance between two ions in an ionic compound; therefore, the compound with the smaller lattice energy will have the larger distance between the ions.
Discussion;
The lattice energy of an ionic compound is a measure of the strength of the bond in the compound.The lattice energy is Inversely proportional to the distance of the atoms apart.Read more:
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Answer:
seriously ....,........
I don't like chemistry
Select all the correct answers.
To formulate hypotheses and construct theories, astronomers analyze data. This analysis helps them find trends that may exist. Which two statements does the data in this table support? If you’re not sure, take a guess.
A. The farther a planet is from the Sun, the longer its orbital period is.
B. Planets with a greater diameter have longer days.
C. The closer a planet is to the Sun, the greater its axial tilt is.
D. Planets with greater mass tend to have more moons.
Answer: A. The farther a planet is from the Sun, the longer its orbital period is, and D. Planets with greater mass tend to have more moons.
Explanation: trust
pls help i am in 8th grade k12
Answer:
zzxdczxc V
Explanation:
The student burns 10 g of magnesium in air to produce magnesium oxide (MgO).
2Mg + 0 + 2MgO
Calculate the maximum mass of magnesium oxide that could be produced in the reaction.
Answer:
x=403/24,3 = 16.58 gm MgO
EXPLANATION
The student burns 10 g of magnesium in air to produce magnesium oxide (MgO)
2Mg + 0 + 2MgO
Calculate the maximum mass of magnesium oxide that could be produced in the reaction.
Oxygen exist in nature as O2, diatomic.
so
The student burns 10 g of magnesium in air to produce magnesium oxide (MgO).
2Mg + 02 + 2MgO
Calculate the maximum mass of magnesium oxide that could be produced in the reaction.
2 moles of Mg produce 2 moles of MgO
1 mole of Mg weighs 24.3 and produces 1 mole of MgO
Mg HAS AN ATOMIC MASS OF 24.3
Mg HAS A MOLAR MASS OF 24.3 +16 = 40.3gm/mole
so 24.3 gm of Mg produce 40.3 gm MgO
set up the ratio
10 gm Mg/x of MgO = 24.3/40.3
or
10/x = 24.3/40.3
cross multiply and isolate x (use Algebra I)
24.3x =403
x=403/24,3 = 16.58 gm MgO
What is the mole ratio between FeCl3 and Fe(C5H7O3)3 ?
Answer: 162.2 g FeCl3. mL of soln = 0.07028 mol FeCl3x ... mol FeCl3 = mol Fe(OH)3 = 0.01291 mol ... (a) MaVa = MbVb since HCl and KOH react in a 1:1 molar ratio.
Explanation:
Please help me ASAP I couldnt copy paste the table so I added a screenshot Please I really need help!!!
Answer:
2.04 Thermal Energy and Chemical Change Lab Report
Explanation:
U ever get an answer
Use the choose reaction drop down menu to see other equations, and balance them. Check your answers and then write the balanced equations. AI+ HCI-> AICI3+ H2
NaCI -> Na + CI2
Na2S + HCI -> NaCI + H2S
When the pressure of a sample of gas is measured in a closed-end manometer, the mercury liquid is measured at a height of 31.6 cm. What is the pressure of the gas, in Pa
The answer is 42,100.
What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?
Answer:
8.1 M
Explanation:
What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?
LET Y = INITIAL CONCENTRATION
SO
Y TIMES 40/720 = 0.45 m
SO
Y= (0.45) X 720/40=
0.45 X 72/4 =
0.45 X 18 =8.1 M
Concentration is related to the mass and volume. 8.1 M initial concentration of a solution is required if 40 ml is diluted to make 720 ml of a 0.45 M solution.
What is initial concentration ?The first measured concentration of a compound in a substance is called as initial concentration. Initial concentration also measure with the help of molarity.
Write out the equation C = m ÷ V, where m is the mass of the solute and V is the total volume of the solution. Substitute the values you found for the mass and volume, and divide them to find the concentration of your solution.
Let X is the initial concentration,
so, X times 40 ÷ 720 = 0.45
X = ( 0.45 ) × ( 720÷40)
= 0.45 × 18
= 8.1 M
Hence, 8.1 M initial concentration of a solution is required .
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Calculate the number of moles in 400g of Tio2
Answer:
5.01 moles
Explanation:
Calculate the number of moles in 400g of Tio2
first, write the formulas correctly
Calculate the number of moles in 400g of TiO2
capitalize the first letter of your elements
the molar mass of TiO2 is
47.88 +2X16.00 =47.88 +32.00 = 79.88 gm/mole
(to 3 sig fig = 79.9 gm/mole
400 gm/79.9 gm/mole = 400/79.9 mole gm/gm =
400/79.9 moles = 5.01 moles
A \pu{1.60 g}1.60 g1, point, 60, space, g calcium supplement contains 37.8\%37.8%37, point, 8, percent \ce{Ca}CaC, a by mass. The calcium is present in the supplement as \ce{CaCO3}(s)CaCOX 3 (s) (molar mass \pu{100.09 g/mol}100.09 g/mol100, point, 09, space, g, slash, m, o, l). How many grams of \ce{CaCO3}(s)CaCOX 3 (s) are in the calcium supplement?
A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.
We want to calculate the mass of CaCO₃ in a 1.60 g supplement. We need to consider the following relationships.
The mass percent of Ca is 37.8%, that is, there are 37.8 g of Ca every 100 g of supplement.The molar mass of Ca is 40.08 g/mol.The molar ratio of Ca to CaCO₃ is 1:1.The molar mass of CaCO₃ is 100.09 g/mol.[tex]1.60gSup \times \frac{37.8gCa}{100gSup} \times \frac{1molCa}{40.08gCa} \times \frac{1molCaCO_3}{1molCa} \times \frac{100.09gCaCO_3}{1molCaCO_3} = 1.51gCaCO_3[/tex]
A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.
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A 1.60 g calcium supplement contains 37.8% Ca by mass. The calcium is present in the supplement as CaCO₃(s) (molar mass 100.09 g/mol). How many grams of CaCO₃(s) are in the calcium supplement?
