N5 Chemistry - Chemical Formula & Balancing Equations

Balance this equation: H₂ + O₂ --> H₂O

• 2H₂ + O₂ --> 2H₂O

• H₂ + O₂ --> H₂O

• 2H₂ + O₂ --> 2H₂O₂

• H₂ + O --> H₂O

Balance this equation: CH4 + O2 --> CO2 + H2O

• CH₄ + O₂ --> CO₂ + 2H₂O

• CH₄ + 2O₂ --> CO₂ + H₂O

• CH₄ + 2O₂ --> 2CO₂ + 2H₂O

• CH₄ + 2O₂ --> CO₂ + 2H₂O

Balance this equation: N2 + H2 --> NH3

• N₂ + 3H₂ --> 2NH₃

• 2N + 6H --> 2NH₃

• N₂ + 3H₂ --> 2NH₃

• N₂ + H₃ --> NH₃

Why is there a decrease in mass when this reaction happens?: CaCO₃ + 2HCl --> CaCl₂ + H₂O + CO₂

• Carbon dioxide gas is released.

• Water is made.

• Chemicals are used up.

• New chemicals are made.

• A reaction happens.

The formula of sodium sulphate is

• NaSO₄

• Na₂SO₄

• Na(SO₄)₂

• Na₂(SO₄)₃

The formula of silver nitrate is

• AgNO₃

• Ag₂NO₃

• Ag(NO₃)₂

The name of Cu(OH)₂ is

• copper hydroxide

• copper(I) hydroxide

• copper(II) hydroxide

The formula of ammonium ion is

• NH₃

• NH₃⁺

• NH₄

• NH₄⁺

The formula of iron(II) hydroxide is

• FeOH₂

• FeOH

• Fe(OH)₂

• Fe(OH)₃

The name of KHCO₃ is

• potassium carbonate

• potassium hydrogencarbonate