C3 Quantitative Chemistry - Combined Higher

What is the conservation of mass?

• That atoms cannot be created or destroyed

• That atoms have different masses

• That atoms can be created and destroyed

• That atoms have different proton numbers and masses

Balance the equation: NaOH + H₂SO₄ --> Na₂SO₄ + H₂O

• 2NaOH + H₂SO₄ --> Na₂SO₄ + 2H₂O

• NaOH + H₂SO₄ --> Na₂SO₄ + 2H₂O

• 2NaOH + H₂SO₄ --> Na₂SO₄ + H₂O

• 2NaOH + 2H₂SO₄ --> 2Na₂SO₄ + 2H₂O

When a metal forms a metal oxide, why does the mass increase?

• Because oxygen atoms have been added

• Because metal atoms have been added

• Because oxygen atoms have been deducted

• Because metal atoms have been deducted

When an acid reacts with a metal, why does the mass decrease?

• Because a gas is produced and escapes

• Because a metal salts are produced which are lighter

• It doesn't decrease, it stays the same

What is relative formula mass?

• The sum of the relative masses of each atom in a compound

• The multiplication of the relative masses of each atom in a compound

• The division of the relative masses of each atom in a compound

• The average of the relative masses of each atom in a compound

What are the four state symbols and what do they stand for?

• (s) solid (l) liquid (g) gas (aq) aqueous

• (S) solid (L) liquid (G) gas (Aq) aqueous

• (so) solid (li) liquid (ga) gas (aq) aqueous

• (So) solid (Li) liquid (Ga) gas (Aq) aqueous

What symbol do we use for relative formula mass?

• M_r

• A_r

• RM_r

• RFM_r

Calculate the Mr of Ba(OH)₂

• 137 + 16 + 1 = 154

• 137 + (16+1)x2 = 171

• 137 + (16+1)x3 = 188

• 137 + (16 x 2) + (1 x 2) = 177

What is a mole?

• A number of particles, atoms or molecules

• A furry animal

• A number which is too big to write down as a whole number

• A number of parts in a substance

What is Avogadro's number?

• 6.02 x 10²³

• 3.01 x 10²³

• 6.02 x 10²⁴

• 3.01 x 10²⁴