Liz is exploring the different kinds of changes that can happen to substances. She knows that changes can alter the looks or shape of a substance. Cutting, melting, bending, or crushing are examples of what kind of change?

Liz is exploring the different kinds of changes that can happen to substances.  After reading about the kinds of changes that occur, she saw some rust on a pipe that was going into her house. What kind of change is the formation of rust?

After learning about chemical reactions, Olivia investigated different kinds of chemical changes using substances she found in her kitchen so she could see these changes. Which of the following can occur when a chemical reaction takes place? Choose the three statements that apply.

Kim understands that there are several signs that indicate a chemical reaction has occurred. What is the best way to be certain that a chemical reaction has occurred?

Some chemical reactions need energy in the form of heat to take place, while others give off energy. Read each of the phrases that describe reactions where energy is released or absorbed. Which phrases suggest that energy has been absorbed?  Check all that apply.

Some chemical reactions need energy in the form of heat to take place, while others give off energy. Read each of the phrases that describe reactions where energy is released or absorbed. Which phrases suggest that energy has been released?  Check all that apply.