Download Socrative Quiz Chemical Reactions 1

Socrative Quiz
CHEMICAL REACTIONS #1
1. The law of conservation of mass states that mass is neither created nor destroyed
in a chemical reaction.
True
False
2. In order to show that mass is conserved during a reaction, a chemical equation
must be balanced.
True
False
3. Because chemical reactions often involve large numbers of small particles,
chemists use a counting unit called the mole to measure the amount of substance.
True
False
4. What is the law of conservation of mass?
5. Why does chemical equation need to be balanced?
6. Why do chemists use the mole as a counting unit?
7. What information do you need to predict the mass of a reactant or product in a
chemical reaction?
8. The following equation describes how sodium and chlorine react to produce
sodium chloride. Is the equation balanced?
2Na +Cl2  2 NaCl
True
False
9. Balance the following equation
K + Br2  KBr
10. Balance the following equation
H2 + O2  H2O