Chemistry Exam Review

The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?

• 1.54 x 10¹² m

• 1.54 x 10⁻¹² m

• 1.54 x 10¹⁰ m

• 1.54 x 10⁻¹⁰ m

Which of the following measurements contains two significant figures?

• 0.00400 L

• 0.00404 L

• 0.00044 L

• 0.00440 L

Which of the following is NOT a physical property of water?

• It has a boiling point of 100°C.

• It is a colorless liquid.

• It is composed of hydrogen and oxygen.

• Sugar dissolves in it.

Which of the following is a physical change?

• oxidation

• explosion

• evaporation

• rotting of food

Which of the following CANNOT be classified as a pure substance?

• sodium chloride

• air

• nitrogen

• gold

Which of the following is a heterogeneous mixture?

• salt water

• air

• sand and water

• bronze

Which of the following is a homogeneous mixture?

• salt water

• chicken noodle soup

• sand and water

• soil

Which of the following is a chemical property?

• color

• hardness

• freezing point

• ability to react with oxygen

Tags

NGSS.MS-PS1-5

What must occur for a change to be a chemical reaction?

• There must be a change in chemical properties.

• There must be a change in physical properties.

• The change must involve a change in mass.

• The change must involve a change in volume.

What happens to matter during a chemical reaction?

• Matter is neither destroyed or created.

• Some matter is destroyed.

• Some matter is created.

• Some matter is destroyed and some is created.