N₂ + O₂ → 2NO

What mass of nitrogen is needed to make 120 g of nitrogen monoxide (NO)?

(A_r: N = 14, O = 16)

(Higher Tier Question)

• 30 g

• 4 g

• 120 g

• 56 g

What does the following equation show? Mg + 2HCl → MgCl₂ + H₂

(Higher Tier Question)

• 1 mole of magnesium reacts with 1 mole of hydrochloric acid to make 2 moles of magnesium chloride and 1 mole of hydrogen

• 1 mole of magnesium reacts with 2 moles of hydrochloric acid to make 2 moles of magnesium chloride and 1 mole of hydrogen

• 1 mole of magnesium reacts with 2 moles of hydrochloric acid to make 1 mole of magnesium chloride and 1 mole of hydrogen

• This reaction isn't possible

Iron reacts with oxygen to form iron oxide. Which of these shows the numbers needed to form the correct balanced equation?

AFe + BO₂ → CFe₂O₃

• A = 2, B = 3, C = 2

• A = 4, B = 3, C = 2

• A = 2, B = 6, C = 2

• A = 1, B = 1, C = 2

What is the relative formula mass of CO (carbon monoxide)?

(A_r: C = 12, O = 16)

• 12

• 16

• 38

• 28

What does the law of conservation of mass tell you about the mass of the reactants and the mass of the products in a reaction?

• The mass of the reactants is always double the mass of the products

• The mass of the reactants is more than the mass of the products

• The mass of the products is more than the mass of the reactants

• The mass of the products equals the mass of the reactants

How many iron, nitrogen and oxygen atoms are there in Fe(NO₃)₃?

• 3 iron atoms, 3 nitrogen atoms and 6 oxygen atoms

• 3 iron atoms, 3 nitrogen atoms and 9 oxygen atoms

• 1 iron atom, 1 nitrogen atom and 3 oxygen atoms

• 1 iron atom, 3 nitrogen atoms and 9 oxygen atoms

How many magnesium, oxygen and hydrogen atoms are there in Mg(OH)₂?

• 1 magnesium atom, 1 oxygen atom and 2 hydrogen atoms

• 1 magnesium atom, 2 oxygen atoms and 2 hydrogen atoms

• 2 magnesium atoms, 2 oxygen atoms and 2 hydrogen atoms

• 1 magnesium atom, 2 oxygen atoms and 1 hydrogen atom

What is the relative formula mass of Fe(NO₃)₃?

(A_r: Fe = 56, N = 14, O = 16)

• 118

• 86

• 214

• 242

Which of these statements about the number of atoms in a mole is correct?

(Higher Tier Question)

• The number of atoms in a mole of carbon is the same as the number of molecules in a mole of carbon dioxide

• The number of atoms in a mole of carbon is half the number of molecules in a mole of carbon dioxide

• The number of atoms in a mole of carbon is higher than the number of molecules in a mole of carbon dioxide

• The number of atoms in a mole of carbon is smaller than the number of molecules in a mole of carbon dioxide

S + O₂ → SO₂

What is the maximum mass of sulfur dioxide that can be made from 16 g of sulfur?

(A_r: S = 32, O = 16)

(Higher Tier Question)

• 32 g

• 16 g

• 0.5 g

• 64 g