7th Grade 2nd Six Weeks Review 2024-25

Which of the following are examples of chemical changes? Select TWO correct answers.

• rust forming on a car door

• water evaporating out of a cup

• burning a log

• dissolving sugar into water

• cutting a piece of paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following are examples of physical changes? Select TWO correct answers.

• silver metal turning black when placed in a clear liquid

• water evaporating out of a boiling pot

• sugar dissolving into a cup of water

• bubbles forming when two substances combine in a beaker

• ash forming from a burning log

All of these arrows indicate —

• chemical changes

• reaction changes

• irreversible changes

• physical changes

Tags

NGSS.MS-PS1-4

As students walk into science class they notice gloves, goggles, and splash aprons on the lab tables. Students should expect which of the following during today’s lab?

• Students will be mixing chemicals that have the potential to harm human tissue.

• Students will be testing magnetic properties of various substances.

• Students will be determining which variable most affects the speed of an object’s fall.

• Students will be testing how heat is conducted through various metals.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-6

Limestone is a common form of calcium carbonate. When limestone is subjected to high heat, it becomes calcium oxide and releases carbon dioxide gas. This change in limestone at a given temperature is an example of —

• a physical change like the melting of ice

• a chemical change like the rusting of iron

• an igneous change like the melting of rock in a volcano

• a reversible change such as hardening melted butter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

This diagram shows what happens when ice is heated. Which statement is true about this diagram?

• The diagram shows a change in chemical properties

• The diagram shows a change in physical properties

• The diagram shows the reduction of heat

• The diagram shows the reduction of matter

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Ten grams of sugar is placed in a beaker with 100ml of water. Initially, the sugar is at the bottom of the beaker however once gradually heated the sugar disappears. Which statement best explains what type of change occurred?

• A chemical, irreversible change

• B physical, irreversible change

• C chemical, reversible change

• D physical, reversible change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Ralph is camping with his family and for dessert, they decide to make smores. Ralph roasts the marshmallow on an open fire until it turns a golden brown. He then adds the toasted marshmallow onto a graham cracker with chocolate causing the chocolate to melt. Which of the following statements best describes the chemical and physical changes that occurred?

• A Toasting the marshmallow is a chemical change and melting the chocolate is a physical change

• B Toasting the marshmallow is a physical change and melting the chocolate is a chemical change

• C The open fire and the layers of a smore (graham, marshmallow, and chocolate) are both a physical change

• D The open fire and the layers of a smore (graham, marshmallow, and chocolate) are both a chemical change

Tags

NGSS.MS-PS1-2

What BEST completes Column A?

• glass breaking

• mixing flour, salt, and sugar

• water separating into hydrogen and oxygen

• sugar cubes dissolving in water

Tags

NGSS.MS-PS1-4

Which of these BEST describes the change in sugar as it dissolves in water?

• The sugar changes its chemicals until it becomes water.

• The sugar gets higher in temperature until it melts into liquid.

• The sugar gets smaller in size until it can no longer be seen.

• The sugar is washed clean until it is perfectly clear.