Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?

• chemical
• mechanical
• nuclear
• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Leslie places 5 pounds of ice in a 1 pound bucket with a lid. The next day, she notices all the ice has melted. When she weighs the bucket with the melted ice, what will itmost likely weigh?

• 4 pounds
• 6 pounds
• 7 pounds

Tags

NGSS.MS-PS1-4

Lisa bought a box of candles weighing 30 ounces. There were 5 candles in the box. Lisa left the box in her car, and the candles melted together, forming one piece of wax. How much will the box of candles most likely weigh after this change?

• 5 ounces
• 6 ounces
• 25 ounces
• 30 ounces

Tags

NGSS.MS-PS1-5

A piece of wood is sawed into several small pieces. This is an example of what kind of change? 

• physical
• chemical
• electrical
• mechanical

Which is a physical change involving an egg? 

• frying an egg
• boiling an egg
• breaking an egg

Which best describes what happens when water condenses on a glass? 

• A physical change occurs, because the water changes form. 
• A physical change occurs, because the water changes color.
  
• A chemical change occurs, because the water gives off light.
  
• A chemical change occurs, because the water forms a new substance. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Campers burned logs in a campfire.
How would the campers know that a chemical change has taken place?

• The logs changed shape.
• The rocks glowed when heated.
• The wood became a different substance.
• The ground absorbed heat from the coals.

Tags

NGSS.MS-PS1-2

Which describes a chemical change?

• sugar dissolving in tea
• sunshine warming a sidewalk
• scissors cutting paper into pieces
• acid in the stomach digesting food

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which example best describes a chemical change?

• wax melting

• an apple turning brown

• a piece of paper being cut into small pieces

Tags

NGSS.MS-PS1-2

Which best explains why burning leaves is a chemical change?

• The leaves emit light during the change.

• The temperature of the leaves increases.

• The shape of the leaves changes.

• The leaves turn to ash and gas as smoke is released

Tags

NGSS.MS-PS1-2