Structures and Properties of Matter

Which of the following changes demonstrates a chemical property?

• substance floats in water

• substance breaks in half

• substance combusts

• hammer bounces off substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The pistons in an engine show how gas behavior can be applied to everyday events. Volume, temperature, and pressure of a gas are all involved in the working of pistons. Which two statements show how these factors are related in pistons according to Charles’s law and Boyle’s law?

• When the temperature is raised, volume increases.

• As temperature increases, pressure increases.

• The piston moves up, decreasing volume and increasing pressure.

• Volume remains constant whenever either pressure or temperature changes.

Tags

NGSS.MS-PS2-2

Which of the following is a solution?

• macaroni and cheese

• cake mix

• salt water

• vegetable soup

Brian and his team were playing basketball in the gym, and all the basketballs were firm and bounced well. When the team went outside, the same basketballs seemed a bit flat and would not bounce well. Which statement provides the best explanation for what happened to the basketballs?

• The temperature outside was colder than the temperature in the gym, so the pressure of the air in the balls decreased.

• The temperature outside was warmer than the temperature in the gym, so the pressure of the air in the balls decreased.

• The temperature outside was colder than the temperature in the gym, so the pressure of the air in the balls increased.

• The temperature outside was warmer than the temperature in the gym, so the pressure of the air in the balls increased.

Tags

NGSS.MS-PS1-4

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

(a)  

Would you feel like a superhero if you could melt metal just by holding it? The element gallium is a solid at room temperature, but it will reach its melting point and melt if you hold it in your hand. If you pour the liquid gallium into a container at room temperature, it will become solid again. How do the melting point and the freezing point of gallium compare to each other?

• The freezing point of gallium is higher than its melting point.

• The freezing point of gallium equals its melting point.

• The freezing point of gallium is lower than its melting point.

• Both the freezing point and the melting point of gallium vary.

Tags

NGSS.MS-PS1-4

Which is the correct equation for calculating density?

• Density = Mass/Weight

• Density = Volume/Mass

• Density = Volume/Weight

• Density = Mass/Volume

Have you ever noticed that some paints, glues, and nail polish remover have a peculiar smell? What you smell might be acetone. Acetone is a liquid at room temperature. Examine the graph showing what happens when liquid acetone becomes a gas.

How many minutes did it take for all of the liquid acetone to become a gas?

• 10

• 20

• 30

• 40

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-2

What is the density of an object whose mass is 180 gams and whose volume is 45 cm ³?

• 4 cm³/g

• 4 g/cm³

• .25 cm³/g

• .25 g/cm³

People who have certain lung diseases, such as emphysema or lung cancer, often have to use oxygen from tanks. A large volume of oxygen can be put into a small tank because oxygen is a gas, and gases can be (a)   .