Question 1

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 2

Which property is an example of an intensive property?

Accepted Answer

Density

Question 3

A student mixes sand and salt in water and wants to separate them. Which sequence of separation techniques should be used?

Accepted Answer

Filtration, then evaporation

Question 4

Which of the following is a chemical property?

Accepted Answer

Ability to rust

Question 5

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout

Question 6

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice

Question 7

Which of the following statements about compounds is TRUE?

Accepted Answer

They are made of two or more elements chemically bonded in a fixed ratio

Question 8

Given the reaction: $$2 \mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2\mathrm{O}$$, if 8.0 g of hydrogen reacts with 64.0 g of oxygen, what mass of water is produced?

Accepted Answer

$$72.0\ \mathrm{g}$$

Question 9

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Cereal with milk

Question 10

Which separation technique would be most effective for obtaining pure water from seawater?

Accepted Answer

Distillation

Question 11

Which of the following is a sign that a chemical reaction has occurred?

Accepted Answer

Change in color

Question 12

Which of the following substances is an element?

Accepted Answer

Copper

Question 13

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

Mass is always conserved in a chemical reaction

Question 14

Which of the following is a physical property of mercury?

Accepted Answer

It is silvery-white and liquid at room temperature

Question 15

Which of the following is the correct chemical symbol for gold?

Accepted Answer

Au

Question 16

A student observes a solution that is uniform throughout and cannot be separated by filtration. What type of mixture is this?

Accepted Answer

Homogeneous mixture

Question 17

Which of the following is a chemical change?

Accepted Answer

Burning gasoline

Question 18

Which of the following best explains why the properties of a compound are different from the properties of the elements that compose it?

Accepted Answer

Compounds have a fixed ratio of elements chemically bonded, resulting in new properties

Question 19

If 228.2 g of octane ($$\mathrm{C}_8\mathrm{H}_{18}) $$reacts and forms 709.2 g of carbon dioxide and 324.4 g of water, how many grams of oxygen reacted? (Use the equation: $$2 \mathrm{C}_8\mathrm{H}_{18} + 25 \mathrm{O}_2 \rightarrow 16 \mathrm{CO}_2 + 18 \mathrm{H}_2\mathrm{O})$$

Accepted Answer

$$805.4\ \mathrm{g}$$

Question 20

Which of the following is the best example of a physical property used to identify a substance?

Accepted Answer

Boiling point

Chapter 3 – Matter: Properties & Changes (General Chemistry Study Notes)

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