Which is a physical reaction

• lighting a match

• rusting metal

• baking a cake

• making sugar water

Which is an example of physical change?

• baking a cake

• burning wood

• freezing water

• rusting iron

Which is an example of a chemical change?

• melting ice

• dissolving salt in water

• hammering metal into a thin sheet of foil

• burning a piece of paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Megan lights a candle and watches it burn. She observes that some wax melts, some smoke comes from the wick, the wick burns, and then the melted wax hardens again. Which represents chemical change?

• some wax melts, and smoke comes from the wick

• some wax melts, and later melted wax hardens again

• the wick burns, and smoke comes from the wick

• smoke comes from the wick, and later melted wax hardens again

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which term defines the force that pulls everything towards the Earth's center?

• direction

• friction

• gravity

• speed

Tags

NGSS.5-PS2-1

Which is an example of physical change?

• baking bread

• dissolving sugar

• rusting metal

• striking a match

Classify the following changes as either CHEMICAL or PHYSICAL, by dropping them into the correct category.​ ​

• Breaking

• physical

• painting

• chemical

• Bending

• physical

• bubbling

• chemcial

• reacting

• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which of the following could indicate that a chemical change took place?

• change of color

• change in temperature or energy

• formation of gases

• all of the above

Tags

NGSS.MS-PS1-2

Which type of change is reversible?

• chemical change

• physical change

• both a and b

• neither

 Maggie is baking cookies. When she takes the cookies out of the oven Maggie notices that the chocolate chips have melted and the cookie is darker after it has been cooked. The melting of the chocolate chips is a ​ ​ (a)   ​ change, while the cookie color being darker is a​ ​ (b)  

• physical change
• chemical change

Tags

NGSS.MS-PS1-4