GCSE 2.6 Quantitative

Which indicator can be used to measure the volumes of acid and alkali solutions that react together by titration?

• Phenolphthalein or methyl orange

• Bromothymol blue or litmus

• Universal indicator or bromocresol green

• Thymol blue or alizarin yellow

What is the volume of one mole of any gas at room temperature and pressure (20 °C and 1 atmosphere pressure)?

• 22 dm³

• 24 dm³

• 26 dm³

• 28 dm³

According to Avogadro's Law, equal volumes of gases at the same temperature and pressure contain the same number of what?

• Atoms

• Molecules

• Ions

• Electrons

What is the formula to calculate the atom economy of a reaction?

• (mass of desired product / total mass of reactants) * 100

• (mass of desired product / total mass of products) * 100

• (mass of reactants / total mass of products) * 100

• (mass of products / total mass of reactants) * 100

Why is a high atom economy important?

• It reduces the cost of raw materials

• It is important for sustainable development and economic reasons

• It increases the yield of the reaction

• It decreases the reaction time

What is the concentration of a solution a measure of?

• The volume of the solvent

• The mass of the solute

• How much of a substance is dissolved in a given volume of water

• The temperature of the solution

What units are usually used to quote the concentration of a solution?

• mol/dm³ or g/dm³

• kg/m³ or g/m³

• mol/L or g/L

• mol/cm³ or g/cm³

What is the concentration in mol/dm³ of a solution containing 11.1 g of CaCl₂ dissolved in 500 cm³ of water?

• 0.1 mol/dm³

• 0.2 mol/dm³

• 0.05 mol/dm³

• 0.15 mol/dm³

What is the concentration of a solution if the number of moles is 0.1 and the volume is 0.5 dm³?

• 0.2 mol/dm³

• 0.5 mol/dm³

• 0.1 mol/dm³

• 0.05 mol/dm³

Which indicator turns red in acid and yellow in alkali?

• Methyl orange

• Phenolphthalein

• Litmus

• Bromothymol blue