1. Balanced chemical equations:
a) 2H₂O₂(l) → 2H₂O(l) + O₂(g)
b) 2C(s) + O₂(g) → 2CO(g)
c) 2HgO(s) → 2Hg(l) + O₂(g)
d) 2HCl(aq) + CaCO₃(s) → CaCl₂(aq) + H₂O(l) + CO₂(g)
e) 2AgNO₃(aq) + Cu(s) → 2Ag(s) + Cu(NO₃)₂(aq)
2. Fill in the blanks:
a) Iron
b) Zinc
c) Single displacement; Zinc; Copper
d) Proteins decompose to form amino acids in our body.
e) If copper turnings are added to colourless AgNO₃ solution, it turns blue after some time.
3. Which of the following displacement reactions will not take place?
a) Zn(s) + FeSO₄(aq) → ZnSO₄(aq) + Fe(s) (Will take place)
b) Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s) (Will take place)
c) Cu(s) + 2AgNO₃(aq) → Cu(NO₃)₂(aq) + 2Ag(s) (Will take place)
d) Cu(s) + FeSO₄(aq) → CuSO₄(aq) + Fe(s) (Will not take place)
4. Which of the following statements is false?
a) Oxidation results in the loss of an electronegative element and the gain of an electropositive element. (False)
b) Reduction results in the loss of an electronegative element and the gain of an electropositive element. (True)
c) A species that gains electrons is referred to as a reducing agent. (False)
d) An oxidising agent is a type of species that absorbs hydrogen atoms. (True)
5. The product formed is calcium hydroxide (Ca(OH)₂). The chemical equation is: CaO(s) + H₂O(l) → Ca(OH)₂(aq)
Parent Tip: Review the logic above to help your child master the concept of chemistry worksheet and answers.
