Chemistry Quiz Grade 9 Flashcards
1
Q
What is the law of conservation of mass?
A
In a chemical change, the total mass of the new substances is always the same as the total mass of the original substances
2
Q
A simpler way to put the law of conservation of mass is?
A
You must start and end with the same amount.
3
Q
What is the law of definite composition?
A
Compounds are pure substances that contain two or more elements combined together in fixed or definite proportions.
4
Q
What is a chemical change?
A
A chemical change causes one or more substances to be formed, impossible or extremely difficult to reverse.
5
Q
What is a physical change?
A
A substance changes in form but not in chemical composition. No new substance is formed.
6
Q
A chemical change has happened if two or more of what occur?
A
7
Q
A
