Quiz about Chem 2 Review

Question 1

You can describe a lemon as being oval, yellow colored, and sour tasting. All of these are _________.

Accepted Answer

Physical properties

Answer

Chemical properties

Answer

Chemical changes

Answer

Physical change

Question 2

All of the following are evidence that a chemical change has occurred except _____.

Accepted Answer

dissolving of a substance when substances are mixed

Answer

formation of a precipitate when substances are mixed

Answer

change in temperature when substances are mixed

Answer

formation of a gas when substances are mixed

Question 3

Which statement about a physical and chemical change is true?

Accepted Answer

a change in temperature often occurs during a chemical change

Answer

if matter changes size or shape, it indicates a chemical change

Answer

if matter changes state of matter, it indicates a chemical change

Answer

if matter changes in color, it is always a physical change

Question 4

Classify each change as physical or chemical. Mark A for physical and B for chemical.

A saw cuts a log and creates sawdust.

Accepted Answer

A

Answer

B

Question 5

Classify each change as physical or chemical. Mark A for physical and B for chemical.

Baking bread.

Accepted Answer

B

Answer

A

Question 6

Classify each change as physical or chemical. Mark A for physical and B for chemical.

The Statue of Liberty changes from copper to green.

Accepted Answer

B

Answer

A

Question 7

Classify each change as physical or chemical. Mark A for physical and B for chemical.

Chocolate syrup is dissolved in milk.

Accepted Answer

A

Answer

B

Question 8

Classify each change as physical or chemical. Mark A for physical and B for chemical.

Leaves changing color in the fall.

Accepted Answer

B. Chemical change

Answer

A. Physical change

Question 9

Using the box shown, what number represents the coefficient?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 10

How many atoms of H are there?

Accepted Answer

8

Answer

4

Answer

6

Answer

10

Question 11

Ben and Jerry put powder in a ziplock bag and added some water. The powder fizzed and bubbled; soon it disappeared. When the bubbling stopped, the bag contained a clear liquid and a lot of gas. What is the most obvious sign of a chemical change in this reaction?

Accepted Answer

a gas was produced

Answer

there was a change in temperature

Answer

the powder mixed with the water

Answer

the powder dissolved in the water

Question 12

George stores a gallon of milk in the refrigerator. 3 weeks later he notices that the milk is frozen on the top layer and smells strongly of a sour odor. Which statement justifies that a physical change has occurred in the milk?

Accepted Answer

The frozen layer on top of the milk can melt when it is at room temperature

Answer

There is less milk since some is frozen

Answer

There is a bacterial culture growing in the milk causing the sour smell

Answer

Some of the sugar in the milk has been lost leading to a more sour taste

Question 13

If there are 4 grams of reactant, how many grams of products are produced by the chemical reaction?

Accepted Answer

4 grams

Answer

8 grams

Answer

2 grams

Answer

0 grams

Question 14

Explain why the chemical reaction to the right obeys the Law of Conservation of Matter.

Accepted Answer

the reactants and products contain the same number of atoms of each element

Answer

there are more reactants than products

Answer

they both start and end with diatomic (two-atomed) molecules

Answer

they both start and end with compounds

Question 15

The law of conservation of matter states that during a chemical reaction, the amount of matter ___.

Accepted Answer

stays the same

Answer

decreases

Answer

increases

Answer

disappears

Question 16

Determine whether the equation is representative of an exothermic or endothermic reaction.

2H2O + heat ----> 2H2 + O2

Accepted Answer

Endothermic

Answer

Exothermic

Question 17

Determine whether the equation is representative of an exothermic or endothermic reaction.

Mg + Cl2 ----> MgCl2 + heat

Accepted Answer

exothermic

Answer

endothermic

Question 18

When you bake cookies in the oven, what is happening in terms of energy?

Accepted Answer

an endothermic reaction, absorbing heat from its surroundings

Answer

an endothermic reaction, releasing heat from its surroundings

Answer

an exothermic reaction, absorbing heat from the surroundings

Answer

an exothermic reaction, releasing heat from its surroundings

Question 19

When vinegar is added to baking soda and bubbles are produced, which of the following best describes what is happening?

Accepted Answer

Formation of a gas

Answer

Color change

Answer

Temperature change

Answer

Formation of a precipitate

Question 20

Use the following data table for the next question. Which question can this experiment answer?

Accepted Answer

Does having earthworms in the soil affect the number of tomatoes that grow on a tomato plant?

Answer

Does the amount of water given to a tomato plant affect the number of earthworms on the plants?

Answer

Does adding water to the soil affect the number of tomatoes that grow on a tomato plant?

Answer

Does the number of tomatoes that grow affect the number of earthworms in the soil?

Question 21

Which question can this experiment answer?

Accepted Answer

Does having earthworms in the soil affect the number of tomatoes that grow on a tomato plant?

Answer

Does the amount of water given to a tomato plant affect the number of earthworms on the plants?

Answer

Does adding water to the soil affect the number of tomatoes that grow on a tomato plant?

Answer

Does the number of tomatoes that grow affect the number of earthworms in the soil?

Question 22

Use the Triple Beam Balance below to identify the correct mass below.

Accepted Answer

77.5 grams

Answer

78 grams

Answer

70.75 grams

Answer

70.8 grams

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