1.	Which coefficients would balance this equation?
		__ MnO_2 + __ HCl → __ MnCl_2 + __ Cl_2 + __ H_2O

| MnO_2 | HCl | MnCl_2 | Cl_2 | H_2O
A. | 1 | 2 | 1 | 1 | 1
B. | 1 | 3 | 1 | 1 | 1
C. | 1 | 4 | 1 | 1 | 2
D. | 1 | 4 | 1 | 2 | 2
(Total 1 mark)

2.	What is the coefficient for H_2SO_4(aq) when the following equation is balanced, using the smallest possible integers?
__Mg_3N_2(s) + __H_2SO_4(aq) → __MgSO_4(aq) + __(NH_4)_2SO_4(aq)
A.	1
B.	3
C.	4
D.	7
(Total 1 mark)

3.	What is the coefficient of Fe_3O_4 when the following equation is balanced using the lowest whole numbers?
		__ Al(s) + __ Fe_3O_4(s) → __ Al_2O_3(s) + __ Fe(s)
A.	2
B.	3
C.	4
D.	5
(Total 1 mark)

4.	What is the sum of the coefficients for the equation when balanced using the smallest possible whole numbers?
		__N_2H_4(g) + __O_2(g) → __NO_2(g) + __H_2O(g)
A.	5
B.	6
C.	7
D.	8
(Total 1 mark)

5.	What is the coefficient for O_2(g) when the equation for the combustion of 1 mole of pentane is balanced?
		C_5H_12(g) + _O_2(g) → _CO_2(g) + _H_2O(g)
A.	5
B.	6
C.	8
D.	16
(Total 1 mark)

6.	What is the sum of all coefficients when the following equation is balanced using the smallest possible whole numbers?
		__ C_2H_2 + __O_2 → __CO_2 + __H_2O
A.	5
B.	7
C.	11
D.	13
(Total 1 mark)

7.	What is the maximum mass, in g, of magnesium oxide that can be obtained from the reaction of oxygen with 2.4 g of magnesium?
A.	2.4
B.	3.0
C.	4.0
D.	5.6
(Total 1 mark)

8.	12 molecules of hydrogen gas, H_2(g), and 5 molecules of oxygen gas, O_2(g), were mixed together under conditions which allowed the reaction to go to completion, according to the following equation.
		2H_2(g) + O_2(g) → 2H_2O(g)
	The following diagram represents the mixture of reactants.

	Which diagram represents the reaction mixture when the reaction was complete?
A.

B.

C.

D.

(Total 1 mark)

9.	What mass, in g, of hydrogen is formed when 3 mol of aluminium react with excess hydrochloric acid according to the following equation?
		2Al(s) + 6HCl(aq) → 2AlCl_3(aq) + 3H_2(g)
A.	3.0
B.	4.5
C.	6.0
D.	9.0
(Total 1 mark)

10.	6.0 mol of aluminium reacts with oxygen to form aluminium oxide. What is the amount of oxygen, in mol, needed for complete reaction?
		4Al(s) + 3O_2(g) → 2Al_2O_3(s)
A.	1.5
B.	3.0
C.	4.5
D.	6.0
(Total 1 mark)

IB Questionbank Chemistry