Question 1

What are is an example of a physical change?

Accepted Answer

Liquid water freezing to solid ice.

Answer

Gasoline catches on fire.

Answer

Bread in the toaster turns brown.

Answer

An apple rots sitting out on the counter.

Question 2

A chemical change occurs when —

Accepted Answer

a leaf changes color in the fall.

Answer

dissolved minerals solidify to form a crystal.

Answer

water freezes during a cold front.

Answer

salt deposits form from evaporated seawater.

Question 3

While sitting in the living room of your house, you smell bacon cooking in the kitchen. This phenomenon occurs because —

Accepted Answer

gas molecules diffuse.

Answer

gas particles are dense.

Answer

smell particles can condense.

Answer

gas molecules can compress.

Question 4

Vegetable oil floats in water because the vegetable oil is —

Accepted Answer

less dense than water.

Answer

colder than water.

Answer

more dense than water.

Answer

warmer than water.

Question 5

Chicken noodle soup is classified as which of the following?

Accepted Answer

heterogeneous mixture

Answer

homogeneous mixture

Answer

compound

Answer

element

Question 6

What is the mass of a 50.0 mL volume sample of corn syrup with a density of 1.37 g/mL?

Accepted Answer

68.5 g

Answer

50.0 g

Answer

36.5 g

Answer

0.0274 g

Question 7

Which state of matter does the following image represent?

Accepted Answer

solid

Answer

gas

Answer

liquid

Question 8

Which of the following statements describes a chemical property of a piece of chalk?

Accepted Answer

Chalk will bubble when reacts with vinegar.

Answer

Chalk can be broken into pieces of different shapes.

Answer

Chalk is white in color.

Answer

Chalk is a solid state of matter.

Question 9

Which of the following is a pure substance?

Accepted Answer

carbon dioxide

Answer

the air

Answer

black coffee

Answer

a bronze statue

Question 10

What is a compound?

Accepted Answer

a substance that contains atoms of two or more different elements that are combined in a fixed proportion

Answer

a type of mixture contains different materials that can easily be distinguished

Answer

a substance in which all the atoms are alike and found on the Periodic Table

Answer

a combination of more than one substance that can be separated by physical means

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