Chemical Equations

What is the chemical equation for the combustion of methane (CH4)?

• CH4 + 2O -> CO2 + H2O

• CH4 + 2O2 -> CO2 + 2H2O

• CH4 + 3O2 -> CO2 + 2H2O

• CH4 + O2 -> CO2 + H2O

Balance the following equation: Fe + O2 -> Fe2O3

• Fe2O3 -> Fe + O2

• 2Fe + O2 -> Fe2O2

• 4Fe + 3O2 -> 2Fe2O3

• Fe + O2 -> FeO

What is the product of the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?

• Sodium hydroxide (NaOH) and hydrochloric acid (HCl)

• Hydrogen gas (H2) and sodium hydroxide (NaOH)

• Water (H2O) and sodium chloride (NaCl)

• Chlorine gas (Cl2) and sodium hydroxide (NaOH)

Write the balanced equation for the reaction between sulfuric acid (H2SO4) and potassium hydroxide (KOH)

• 2H2SO4 + 2KOH -> 2H2O + K2SO4

• 2H2SO4 + KOH -> H2O + K2SO4

• H2SO4 + KOH -> H2O + K2SO4

• H2SO4 + 2KOH -> 2H2O + K2SO4

What is the chemical formula for sodium chloride?

• NaCl

• HCl

• CO2

• H2O

In the reaction between silver nitrate (AgNO3) and sodium chloride (NaCl), what is the precipitate formed?

• Sodium nitrate (NaNO3)

• Sodium chloride (NaCl)

• Silver chloride (AgCl)

• Silver nitrate (AgNO3)

What is the product of the reaction between magnesium (Mg) and hydrochloric acid (HCl)?

• Magnesium chloride and hydrogen gas

• Magnesium hydroxide and hydrogen gas

• Magnesium oxide and chlorine gas

• Magnesium sulfate and oxygen gas

Balance the equation: Na + H2O -> NaOH + H2

• Na + H2O -> NaH2O + H2

• Na + H2O -> NaOH + H2

• Na + H2O -> Na2OH + H2

• Na + H2O -> Na2O + H2

What is the chemical equation for photosynthesis?

• 6CO2 + 6H2O -> C6H12O6 + 6O2

• 6CO2 + 6H2O + heat energy -> C6H12O6 + 6O2

• 6CO2 + 6H2O + light energy -> C6H12O6 + 6O2

• 6CO2 + 6H2O + ATP -> C6H12O6 + 6O2

What happens when calcium carbonate (CaCO3) is heated?

• Calcium carbonate evaporates into the air.

• Calcium carbonate forms a solid crystal structure.

• Calcium carbonate turns into water and oxygen.

• Calcium carbonate decomposes into calcium oxide and carbon dioxide.