Chemical Change Flashcards
1
Q
What is a chemical change?
A
A chemical change is when atoms rearrange to form new substances
2
Q
What are signs of this?
A
Colour change Smelling gas or seeing bubbles New solid Forming in a clear solution Heat and light
3
Q
What is a precipitate?
A
A new solid forming in a clear solution
4
Q
What is an exothermic reaction?
A
A chemical reaction which releases energy
5
Q
What is an endothermic reaction?
A
It absorbs energy
6
Q
What is a word equation?
A
The simplest way to write a chemical change equation, using names of reactants and products
7
Q
What is a formula equation?
A
When the chemical names of the reactants and products are replaced with its chemical formula
