Question 1

xH₂O₂    →    yH₂O  +  zO₂   This equation will be balanced when

Accepted Answer

x = 2, y = 2 and z = 1

Answer

x = 2, y = 2 and z = 2

Answer

x = 1, y = 1 and z = 2

Answer

x = 1, y = 2 and z = 2

Question 2

wAl    +   xCuCl₂    →    yAlCl₃    +     zCu    This equation will be balanced when

Accepted Answer

w = 2, x = 3, y = 2 and z = 3

Answer

w = 1, x = 2, y = 1 and z = 2

Answer

w = 3, x = 2, y = 3 and z = 2

Answer

w = 2, x = 3, y = 3 and z = 2

Question 3

How many moles are in 11 g of carbon dioxide?

Accepted Answer

0.25

Answer

44

Answer

11

Answer

3

Question 4

What is the mass of 3 moles of methane (CH₄)

Accepted Answer

48g

Answer

16g

Answer

5.3g

Answer

3g

Question 5

0.5 moles of a substance has a mass of 50g. What could me the chemical formula of the substance?

Accepted Answer

KI

Answer

CaCO₃

Answer

MgO

Answer

NaCl

Question 6

What is the concentration of sodium chloride solution if 4 moles are dissolved in 2 litres of water?

Accepted Answer

2 mol l⁻¹

Answer

8 mol l⁻¹

Answer

6 mol l⁻¹

Answer

4 mol l⁻¹

Question 7

How many moles of a potassium chloride need to be dissolved in 500 cm3 of water to make a solution with a concentration of 0.8 mol l-1?

Accepted Answer

0.4

Answer

0.8

Answer

400

Answer

1.6

Question 8

What mass of sodium chloride would need to be disoolved in 1 l of water to make a 2 mol l⁻¹ solution?

Accepted Answer

117g

Answer

0.5g

Answer

29.25g

Answer

2g

Question 9

What concentration of solution would be produced if 42.5g of NaNO₃ were dissolved in 250cm³ of water?

Accepted Answer

2 mol l⁻¹

Answer

170 mol l⁻¹

Answer

0.17 mol l⁻¹

Answer

0.002 mol l⁻¹

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