CIE iGCSE Co-Ordinated Science C3.1 Formulas Exam Style Questions Paper 2
Question
The equation for the reaction of sodium with water is shown.
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Which mass of sodium produces 30 cm3 of hydrogen?
(A) 0.0288 g (B) 0.0575 g (C) 28.8 g (D) 57.5 g
▶️Answer/Explanation
Ans: B
Question
The equation for the combustion of magnesium is shown.
2Mg + O2 → MgO
What is the mass of magnesium oxide formed from 12 g of magnesium?
(A) 20g (B) 24g (C) 40g (D) 80g
▶️Answer/Explanation
Ans : BA
Question
In an experiment, 2.4 g of magnesium, Mg, is burned in 5.0 g of oxygen, O2.
The equation for the reaction is shown.
2Mg + O2 → 2MgO
Which row identifies the substance that reacts completely and shows the mass of magnesium oxide formed?
▶Answer/Explanation
Ans :A
Question
Nonane, C$_{9}$H$_{20}$, burns in oxygen to form carbon dioxide and water.
The equation for this reaction is shown.
C$_{9}$H$_{20}$ + 14O$_{2}$ 9CO$_{2}$+ 10H$_{2}$O
What is the mass of oxygen required for the complete combustion of 64 g of nonane?
(A) 32 g
(B) 224 g
(C) 396 g
(D) 448 g
▶️Answer/Explanation
Ans : B