Chemistry

Question 1

What is the law of conservation of mass?

Answer 1

The mass of a set of atoms never changes over time no matter how atoms rearrange themselves.

Question 2

Word and chemical equation for photosynthesis

Answer 2

Carbon dioxide + water + (light energy) glucose + oxygen gas.

6CO2 + 6H2O → C6H12O6 + 6O2

Question 3

Word and chemical equation of respiration

Answer 3

Glucose + Oxygen = Carbon Dioxide and Water

C6H1206 + O2 = CO2 + H20

Question 4

Factors affecting chemical reactions

Answer 4

• The concentration of the reactants. The more concentrated the faster the rate.
• Temperature. …
• Catalyst
• Surface area
  Light.

Question 5

Reactions of metals with carbonates. Reactants and products

Answer 5

• Metal + acid = salt + hydrogen gas
• Metal carbonate + acid = salt + water + carbon dioxide
• Metal bicarbonate + acid = salt + water + carbon dioxide

Question 6

What are some reactions where gases are produced

Answer 6

• Acid + metal = hydrogen gas
• Acid + metal carbonate = carbon dioxide
• Decomposition of water

Question 7

What is combustion:
What is corrosion:
What is decomposition:
What is neutralization:
What is precipitation:

Answer 7

• Gas + Oxygen → Carbon Dioxide + Water + Heat.
• wearing away due to chemical reactions, mainly oxidation (
• Then a compound breaks down to two or more substances
• acid + base = Water +salt
• cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate.