Science (chemical reactions)

Question 1

Law of conservation of mass

Answer 1

Mass is not created or destroyed.
Total mass of reactants = products.

Question 2

Identify reactants/products

Answer 2

Reactants: Before the arrow
Products: After the arrow

Question 3

Precipitation reactions

Answer 3

Soluble salt A + Soluble salt B → Solid product (precipitate) + Soluble salt C

Question 3

How to make neutral compounds?

Answer 3

Combine cations (+) and anions (−) to make neutral compounds.

Question 3

Endothermic/Exothermic?

Answer 3

Endothermic: Absorbs heat.
Exothermic: Releases heat.

Question 3

Combination reactions

Answer 3

A+B–>AB
2 or more compounds combine to form one compound

Question 4

Combustion reactions

Answer 4

Compound containing carbon + O^2 –> water H2O + carbon dioxide CO2

Question 5

Decomposition reactions

Answer 5

Opposite of combination
AB–> A+B

Question 6

Neutralisation reactions

Answer 6

Acid +Base–>Salt +Water H2O

Question 7

Displacement reactions

Answer 7

A+BC–>AC+B

Question 8

How to see if the compound is acid or base?

Answer 8

Acid have OH at the back, Base has H in the front