Chem Chapter 10

Question 1

A compound that has a specific number of water molecules bound to its atoms

Answer 1

Hydrate

Question 2

Percent by mass of each element in a compound

Answer 2

Percent Composition

Question 3

Mass in grams of one mole of any pure substance

Answer 3

Molar Mass

Question 4

Specifies the actual number of atoms of each element in one molecule of a compound

Answer 4

Molecular Formula

Question 4

The formula of a compound with the smallest whole number ratio of the elements

Answer 4

Empirical Formula

Question 5

SI base unit used to measure the amount of a substance

Answer 5

Mole

Question 5

Benzene (C6H6) and Acetylene (C2H2) have the same empirical formula but different MOLECULAR FORMULA

Answer 5

True

Question 5

The PERCENT COMPOSITION of carbon is equal to carbon atomic mass and has the units g/mol

Answer 5

MOLAR MASS

Question 6

6.02 x 10^23

Answer 6

Avagaros Number

Question 7

One MOLE of water contains 6.02 x 10^23 molecules of water

Answer 7

True

Question 8

The empirical formula of a compound can always be used to determine the compounds MOLAR MASS

Answer 8

MOLECULAR FORMULA

Question 9

A mole of Potassium Chloride (KCl) contains 6.02 x 10^23

Answer 9

Formula Units KCl

Question 10

How many moles of Oxygen do 1.5 moles of CO2 contain

Answer 10

3 mol

Question 11

Which compound has the smallest molar mass

Answer 11

H2O

Question 12

The SI unit of molar mass is the

Answer 12

gram/mol (g/mol)

Question 13

Which conversion factor would you use to calculate the mass of 2 moles of the element titanium

Answer 13

47.9b Ti / 1 mol Ti

Question 14

What is the mass of one mole of Silicon Carbide (SiC)

Answer 14

40.1 g

Question 15

What percent of Methane (CH4) is Hydrogen

Answer 15

25%

Question 16

What is the percent by mass of Carbon in Acetone C2H6O

Answer 16

62.1%

Question 17

The chemical formula of Asprin is C9H8O4, what’s the mass of .200 mol of Asprin

Answer 17

36.0 g

Question 18

Sodium Bromide Dihydrate is correctly written as

Answer 18

NaBr DOT 2 H20

Question 19

As a hydrated compound is heated, it decreases in

Answer 19

Mass

Question 20

What effect do temperature and relative humidity have on the color of the compound in the vial

Answer 20

When the vial is light blue it is dry and when it is pink the component has moisture in it making it change colors

Question 21

What can you infer from Lisa’s observation about the type of compound in the vial? Explain your reasoning

Answer 21

I can infer it is a hydrate because it starts as light blue which is dry and when it gets warm it dries back up again

Question 22

Equation Questions

Answer 22

1. Take the Grams and x by 1 mol
2. Divide that by each element’s molar mass (Number under element)
3. Once you have done that for all, divide all the answers by the lowest answer
4. Round the answers to the nearest whole

Question 23

Which chemical formula is a possible chemical formula for compound 2? Explain your reasoning. CoCl2 DOT 2H20 CoCl2 DOT 8H20

Answer 23

CoCl2 because if you were to estimate the numbers on the graph you would get mostly 1,2 and 3s for the charges. There couldn’t be that much Hydrogen and Oxygen because it starts with low numbers to begin with.