Chemistry Mid-Term Review on Modules 1, 3-5 for Mr. Phillips

Module #1 - Measurements and Units

100

What is matter?

Anything that has mass and takes up space!

200

If an object has a volume of 45.1 mL, what is it volume in liters?

0.0451 L

300

Convert the number 0.00341 to scientific notation.

3.41 X 10^-3

400

If the mass of a liquid is 23.13 grams and its volume is 35.0 mL, what is its density?

.661 g/mL

500

What is the mass of 0.67 liters of gold? The density of gold is 19.3 g/mL.

13,000 g

Module #3 - Atoms and Molecules

100

What is the law of mass conservation?

Matter can't be created or destroyed; it can only change forms.

200

How can you experimentally determine whether a compound is ionic or covalent?

An ionic compound will conduct electricity when dissolved in water.

300

Is NaCl covalent or ionic?

Ionic

400

What is the chemical formula for dinitrogen tetrahydride?

N₂H₄

500

In making calcium chloride, 100.0 grams of calcium plus 100.0 grams of chlorine makes 156.5 grams of product along with some left over calcium. How much chlorine and calcium should be added together in order to make 1.000 kg of calcium chloride without any left overs?

639.0 g of chlorine and 361 g of calcium to  make 1.000 kg of calcium chloride.

Module #4 - Classifying Matter

100

What is a pure substance?

A substance that contains only one element or compound.

200

If a liquid goes through a phase change and all you know is that the molecules sped up and moved farther apart, what phase did the liquid turn in to?

The liquid turned into a gas.

300

What kind of mixture is cereal in milk?

Heterogeneous mixture

400

Balance the following equation:

C₅H₁₂ + O₂ -> CO₂ + H₂O

C₅H₁₂ + 8O₂ -> 5CO₂ + 6H₂O

500

Balance the following equation:

CO₂ + H₂O -> C₁₈H₃₂O₁₆ + O₂

18CO₂ + 16H₂O -> C₁₈H₃₂O₁₆ + 18O₂

Module #5 - Counting Molecules and Atoms in Chemical Equations

100

What is a decomposition reaction?

A reaction that changes a compound into its original elements.

200

What is a complete combustion reaction?

A reaction in which O₂ is added to a compound containing carbon and hydrogen, producing CO₂ and H₂O.

300

What is the mass of a nitrogen atom in grams? (1.00 amu = 1.66 X 10^-24 grams)

2.32 X 10^-23 grams

400

How many moles are in 34.5 g of NaBrO3?

0.229 moles

500

If a chemist has 12.3 moles of N2H4O3, what is the mass of the sample?

984 g

Module #5 -Part 2

100

What is a formation reaction?

A reaction that starts with two or more elements and produces one compound.

200

What is Avogadro's number?

6.02 X 10²³

300

What is the mass of a Ca atom in kg? (1.00 amu =  1.66 X 10^-24 grams)

6.66 X 10^-26 kg

400

What is the mass of a Pr atom, in kg?

2.34 X 10^-25 kg

500

Which sample has more atoms in it: 150.0 grams of Gold (Au) or 10.0 grams of lithium?

The 10.0 grams of lithium has more atoms than 150.0 grams of Au because it has more moles.