Sc 8 P 9 2

Amanda investigated physical and chemical changes in science class and then classified her changes into two columns shown. Column A are the chemical changes and Column B are the physical changes. Which statement below best explains why the processes in Column B are physical changes?

• The change has formed new substances

• The shape of the substance has changed

• The change that occurred can be reversed easily

• The characteristics of the original substance have not changed

Amanda investigated physical and chemical changes in science class and then classified her changes into two columns shown. Column A are the chemical changes and Column B are the physical changes. Which statement below best explains why the processes in Column A are chemical changes?

• The change has formed new substances

• The shape of the substance has changed

• The change that occurred can be reversed easily

• The characteristics of the original substance have not changed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ashley has two samples of water at different temperatures shown. She drops a glow stick 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-PS3-4

NGSS.MS-PS1-4

NGSS.MS-PS3-5

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-PS3-4

NGSS.MS-PS3-5

NGSS.MS-PS3-1

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

Alison finds the total mass of a sample of baking soda, a balloon, and a glass container with vinegar in it. She adds the baking soda to the vinegar and immediately places the balloon over the mouth of the container. After the reaction is complete, she again finds the total mass of the system. Which statement is true about this investigation?

• The mass changes because there was a chemical change that occurred

• Mass is lost during the reaction because a chemical change is taking place

• Mass is gained during the reaction because a chemical change is taking place

• The mass does not change because chemical changes observes the law of conservation of mass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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 sugar did she dissolve in the water?

• 9 g

• 11 g

• 13 g

• 17 g

Tags

NGSS.MS-PS1-2

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

• 9g

• 11g

• 56g

• 67g

Tags

NGSS.MS-PS1-2

Mrs. Winston decides to do a demonstration for her class with a piece of chalk. Using a balance, Mrs. Winston discovers that the mass of the chalk is 20 g. She then takes the piece of chalk and crushes into a fine powder. The cumulative mass of the fine powder is 20 g. What has Mrs. Winston demonstrated for her class?

• a chemical change involving change of shape and size of matter

• a chemical change involving change of mass

• a physical change involving change of shape and size of matter

• a physical change involving change of mass

Tags

NGSS.MS-PS1-2