Chemistry Pretest

Which of the following changes demonstrates a chemical property?

• substance breaks in half

• substance combusts

• hammer bounces off substance

• substance floats in water

Tags

NGSS.MS-PS1-2

Which of the following is a solution?

• salt water

• macaroni and cheese

• cake mix

• vegetable soup

The abilities to dissolve in water and to conduct electricity are examples of

• natural properties

• chemical properties

• natural laws of matter

• physical properties

Tags

NGSS.MS-PS1-2

Which is the correct equation for calculating density?

• Density= Mass/Volume

• Density = Mass/Weight

• Density = Volume/Mass

• Density = Volume/Weight

Weight is a flawed measure of mass because it

• is not used in other countries

• is affected by the force of gravity

• tends to fluctuate

• can be influenced by temperature and pressure

Which of the following describes a physical change?

• A marshmallow burns over an open flame.

• Icicles melt from a rooftop

• A cat eats a piece of fish

• Milk turns sour

Tags

NGSS.MS-PS1-4

Which of the following describes a chemical change?

• clear liquids mix, producing a cloudy liquid with yellow chunks

• sliver coins are melted down and shaped into a solid brick

• salt is added to a pot of hot water, and the water's boiling point changes

• an apple is chopped into eight slices

Tags

NGSS.MS-PS1-2

The law of conservation of mass states that

• matter is neither created or destroyed

• the mass of an object remains the same even if chemical change occurs

• the number of molecules before and after a chemical reaction cannot change

• mass is lost when a chemical change occurs

Tags

NGSS.MS-PS1-5

Temperature is

• the movement of thermal energy from a solid to a liquid

• the difference in thermal energy between two objects

• a measure of how hot or cold something is

• a measure of how fast thermal energy is moving

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A substance that has neither a definite shape nor a definite volume is a

• fluid

• solid

• liquid

• gas