Substances that are changed into something new are what?
Chemical reactions that require constant energy are what type?
You have the same amounts of substances, one is granular and the other in powder. When they undergo a chemical reaction the powder reacts faster because it has more
When you mix a crystal and water together the temperature goes down. This is a ____________ reaction.
While mixing 2 liquid solutions you notice white particles at the bottom of the beaker. You know a chemical reaction took place because of the ______________.
What is actually happening in a chemical reaction?
are represented by equations.
While hiking in the woods, you see a brown rotting apple lying on the ground. What changes in the physical properties of the apple are sign that a chemical reaction has occurred?
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 all that apply.
Identify each item as either chemical change or physical change.
Water to ice
color change
energy change
size change
precipitation
precipitate
Physical Change
Chemical change
If something slows down a chemical reaction it is a(n) ______________.