Physical and chemical changes

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

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

Priya is making popcorn for a movie night with William and Mason. She melts some butter to pour over the popcorn. Is this a chemical or physical change?

• chemical

• physical

Oliver decided to change his look and thought of bleaching his hair. Zoe and Anika were discussing whether this is a physical or chemical change. What do you think?

• physical

• chemical

Daniel and Sophia were camping. They decided to make a bonfire. Luna asked, is burning wood for the bonfire a chemical or physical change?

• chemical

• physical

A change in the size, shape, or state of matter is known as a _____.

David and Evelyn were learning about plants in their science class. Their teacher, Ms. Anika, explained that photosynthesis is an example of a

• physical change

• chemical change

When you break a cracker into pieces it is a 

• Chemical change
• Physical change
• Chemical Weathering
• Physical Weathering

Ava and Noah were doing a science experiment at home. They mixed baking soda and vinegar together and it fizzed up, creating carbon dioxide. What evidence shows a chemical change occurred?

• Color Change

• A Precipitate forms

• Gas production

• Light Production

• Temperature Change

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.

Tags

NGSS.MS-PS1-2

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