Unit 6 Flashcards
1
Q
What is a chemical change
A
In a chemical change, a new chemical substance is produced
2
Q
How can you tell that a chemical reaction is taking place
A
One or more new chemical substances are formed. The new substances usually looks different from the starting substances.
Energy is taken in a given out during the reaction
The change is usually difficult to reverse. This means that it will be hard to get back the raw materials of the reaction.
3
Q
What is a exothermic reaction?
A
A change that gives out heat during a chemical reaction
4
Q
What is a endothermic reaction?
A
Change that takes in heat energy during a reaction
