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WorksheetsGCSE 2.6 Quantitative
Total questions: 27
Worksheet time: 16mins
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
What is the color of phenolphthalein in an alkaline solution?
Pink
Red
Yellow
Colorless
What is the first step in preparing a burette for titration?
Rinse the burette with deionised water
Fill the burette with the required solution
Discard the water from the burette
Rinse the burette with the solution being measured out
What is the purpose of adding a few drops of indicator to the solution in the conical flask during titration?
To determine the end point of the titration
To increase the reaction rate
To neutralize the solution
To dilute the solution
What should be recorded after adding the solution from the burette to the conical flask with swirling?
The final reading on the burette
The initial reading on the burette
The color of the solution
The volume of the conical flask
How should the average titre value be calculated?
Using only the rough titre values.
Using only the accurate titre values.
Using both rough and accurate titre values.
Using the highest titre value.
What is the formula to calculate the number of moles from the volume and concentration?
What is the balanced chemical equation for the reaction between sulfuric acid and sodium hydroxide?
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
H₂SO₄ + NaOH → Na₂SO₄ + H₂O
H₂SO₄ + 2NaOH → Na₂SO₄ + H₂
H₂SO₄ + NaOH → Na₂SO₄ + 2H₂O
Write an equation for the reaction between hydrochloric acid and sodium carbonate.
2HCl + Na₂CO₃ → 2NaCl + H₂O + CO₂
HCl + Na₂CO₃ → NaCl + H₂O + CO₂
2HCl + Na₂CO₃ → NaCl + H₂O + CO₂
HCl + Na₂CO₃ → 2NaCl + H₂O + CO₂
What is the formula for the compound with 7 molecules of water of crystallisation?
Na₂CO₃·5H₂O
Na₂CO₃·7H₂O
Na₂CO₃·10H₂O
Na₂CO₃·12H₂O
What is the volume occupied by 1 mole of any gas at room temperature and pressure (20 °C and 1 atm)?
24 cm³
240 cm³
2400 cm³
24000 cm³
How do you calculate the number of moles of a gas if you know its volume in cm³?
moles = gas volume (cm³) / 24
moles = gas volume (cm³) / 240
moles = gas volume (cm³) / 2400
moles = gas volume (cm³) / 24000
What volume of oxygen is required for the complete combustion of 11.5 g of sodium?
1 dm³
2 dm³
3 dm³
4 dm³
According to Avogadro's Law, what do equal volumes of gas under the same conditions of temperature and pressure contain?
Different numbers of molecules
The same number of molecules
Different numbers of atoms
The same number of atoms
What is the volume ratio of methane to oxygen in the reaction CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)?
1:1
1:2
2:1
2:2
What volume of oxygen is required to react with 10 dm³ of methane to form carbon dioxide and water using the balanced equation:
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)?
10 dm³
15 dm³
20 dm³
25 dm³
How is atom economy calculated?
(mass of desired product / total mass of reactants) × 100
(mass of desired product / total mass of products) × 100
(total mass of products / mass of desired product) × 100
(total mass of reactants / mass of desired product) × 100
To prepare aqueous calcium chloride, a student added the exact amount of calcium so that all the hydrochloric acid had reacted. They used 50 cm³ of 2.0 mol/dm³ hydrochloric acid. Calculate the mass of calcium that was required.
0.5 g
1.0 g
2.0 g
4.0 g
