Year 10 Chemical Reactions 2nd Practice

In the reaction CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l) which product is dissolved in solution?

• HCl

• H₂O

• CO₂

• CaCl₂

What is the correct formula for potassium sulphate?

• PSO₄

• K₂SO₄

• KSO₄

• K(SO₄)₂

How many zinc atoms are in Zn(NO₃)₂?

• 1

• 2

• 3

• 6

How many oxygen atoms are in Zn(NO₃)₂?

• 1

• 2

• 3

• 6

Which is a way to measure reaction rate?

• Measure product formed per unit time

• Measure how quickly reactants are used

• Measure time to observe change

• All of the above

Which equation is NOT balanced?

• 4Al + 3O₂ → 2Al₂O₃

• Mg + 2HCl → MgCl₂ + H₂

• 2Zn + O₂ → 2ZnO

• C₅H₁₂ + 8O₂ → CO₂ + 6H₂O

Placing copper into silver nitrate causes silver crystals to form. This is a:

• Combustion reaction

• Precipitation reaction

• Redox reaction

• Displacement reaction

What happens if zinc is placed in sodium sulphate solution?

• Nothing

• Sodium metal forms

• Zinc sulphate forms

• Sodium disintegrates

Which is a precipitate?

• KNO₃

• NaCl

• BaSO₄

• Pb(NO₃)₂

Sawdust burns faster than solid wood mainly because:

• Increased surface area

• Higher concentration

• Higher temperature

• Catalyst effect