SC 8 P 9 3

Why is the formation of rust considered a chemical change?

• Rust is more reactive than oxygen

• Rust has the same chemical composition as iron

• Rust has a lower density than iron

• Rust has properties that are different from iron and oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ashley has two samples of water at different temperatures shown. She drops an Alka-Seltzer tablet into each sample of water at the same time and starts a timer to measure the rate of reaction. Which statement below best describes what Ashley should expect to find from her investigation?

• Sample A will have a greater rate of reaction than Sample B, because the temperature in Sample A is lower

• Sample B will have a greater rate of reaction than Sample A, because the temperature in Sample B is lower

• Sample A will have a greater rate of reaction than Sample B, because the temperature in Sample A is greater

• Sample B will have a greater rate of reaction than Sample A, because the temperature in Sample B is greater

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. From his observation and research, he concludes that the substance goes through a chemical change when heated. How can Ethan best defend his conclusion?

• By verifying that the substance is made up of only one type of element

• By demonstrating that the substance has the same density after it is heated

• By verifying that the substance is now made up of different molecules than before it was heated

• By demonstrating that the substance will eventually melt if the temperature continues to increase

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?

• Some of the matter is destroyed during the reaction

• The volume of the ash is less than the volume of the paper

• The mass of the ash cannot be accurately determined

• Some of the matter changed to a gas and was released to the air

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Andrea makes a sugar solution, as shown. How much water did she dissolve in the sugar in?

• 9g

• 11g

• 56g

• 67g

Tags

NGSS.MS-PS1-5

Which model above represents the attractive forces in a liquid?

• Model 3 represents a liquid because the particles are hardly affected by the attractive forces.

• Model 2 represents a liquid because the attractive forces keep the particles vibrating in place

• Model 1 represents a liquid because the particles are locked in their positions because of the attractive forces.

• Model 2 represents a liquid because the attractive forces keep the particles close together but still allow movement.

Which model above represents the attractive forces in a solid?

• Model 3 represents a solid because the particles are hardly affected by the attractive forces.

• Model 1 represents a solid because the attractive forces keep the particles vibrating in place.

• Model 1 represents a solid because the particles are locked in their positions because of the attractive forces.

• Model 2 represents a solid because the attractive forces keep the particles close together but still allow movement.

Which model above represents the attractive forces in a gas?

• Model 3 represents a gas because the particles are hardly affected by the attractive forces.

• Model 2 represents a gas because the attractive forces keep the particles vibrating in place.

• Model 1 represents a gas because the particles are locked in their positions because of the attractive forces.

• Model 3 represents a gas because the attractive forces keep the particles close together but still allow movement.

Which statement below best describes the movement of particles in a liquid?

• The particles do not move

• The particles move freely

• The particles vibrate in a fixed position

• The particles slide easily past one another

Tags

NGSS.MS-PS1-4

Which statement below best describes the movement of particles in a solid?

• The particles do not move

• The particles move freely

• The particles vibrate in a fixed position

• The particles slide easily past one another