Changes

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Is burning wood a chemical or physical change?

• chemical
• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A change in the size, shape, or state of matter.

• chemical change
• physical change
• chemical reaction
• electron change

Photosynthesis is an example of a

• physical change
• chemical change

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

Which is a physical change?

• burning match 
• vinegar in baking soda 
• melting butter
• cooking an egg

Tags

NGSS.MS-PS1-4

what is the definition of physical change?

• any change that results in the formation of new chemical substances. 
• rusting
• changes affecting the form of a chemical substance, but not its chemical composition.
• any property that is measurable, whose value describes a state of a physical system

what is the definition of chemical change?

• any change that results in the formation of new chemical substances. 
• changing clothes
• matter cannot be created or destroyed, only change form
• changes affecting the form of a chemical substance, but not its chemical composition.

Which of the following describes a precipitate?

• a liquid forms when a block of metal is heated
• a solid forms when one liquid is poured into another
• a gas forms when a solid is placed in a liquid
• bubbles form when an acid is poured on a rock

Tags

NGSS.MS-PS1-2

Is sharpening a pencil a physical or chemical change?

• Physical 
• Chemical

Is mold growing on cheese a physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.MS-PS1-2