Year 11 Paper 3: Mixed Topic Practice
Covers infection and response, bioenergetics, quantitative chemistry, chemical changes and forces.
Year 11 here means a typical teaching order, not a syllabus rule. No exam board defines what belongs to Year 11, and schools sequence the course differently. Check it against your own scheme of work before using it to decide what a class has covered.
Questions
Question 1 [3 marks]
Quantitative Chemistry
Sodium hydroxide has the formula NaOH and a relative formula mass of 40.
Calculate the mass of 0.4 moles of sodium hydroxide.
Question 2 [3 marks]
Infection and Response
Measles is a communicable disease caused by a virus.
State three measures that can be taken to reduce the spread of an infectious disease such as measles.
Question 3 [3 marks]
Bioenergetics
The rate of photosynthesis can be limited by several environmental factors.
State three factors that can limit the rate of photosynthesis.
Question 4 [4 marks]
Forces
A rock has a mass of 15 kg.
The gravitational field strength on Earth is 9.8 N/kg, and on the Moon it is 1.6 N/kg.
Calculate the weight of the rock on Earth, and calculate its weight on the Moon. Use weight = mass x gravitational field strength.
Question 5 [4 marks]
Chemical Changes
Acids react with metal carbonates in neutralisation reactions.
State the three products formed in the general reaction between an acid and a metal carbonate, and describe a test that could be used to confirm the identity of one of these products.
Question 6 [4 marks]
Forces
A see-saw is balanced with a pivot at its centre.
A child of weight 300 N sits 1.5 m from the pivot on one side.
Calculate the distance from the pivot on the other side at which a child of weight 250 N must sit for the see-saw to balance. Use moment = force x distance.
Question 7 [4 marks]
Infection and Response
A single bacterium divides by binary fission every 20 minutes on a nutrient agar plate.
Starting with 1 bacterium, calculate the number of bacteria present after 3 hours, assuming unlimited nutrients.
Question 8 [5 marks]
Bioenergetics
Yeast is a single-celled fungus that can respire anaerobically, in a process called fermentation.
Write the word equation for anaerobic respiration in yeast (fermentation), and describe one everyday use of this process.
Question 9 [5 marks]
Chemical Changes
Excess magnesium ribbon is added to 50 cm^3 of hydrochloric acid of concentration 2.0 mol/dm^3: Mg + 2HCl -> MgCl2 + H2.
Calculate the maximum mass of magnesium chloride that could be produced. Relative formula mass of MgCl2 = 95.
Question 10 [5 marks]
Infection and Response
In a clinical trial, a new drug is given to 250 patients and a placebo is given to another 250 patients.
175 of the patients given the drug show improvement, compared with 50 of the patients given the placebo.
Calculate the percentage of each group that showed improvement, and calculate how many percentage points higher the improvement rate was in the drug group.
Model solutions
| Question 1[3 marks] | |
|---|---|
| Answer or working | Marks |
| using mass = moles x relative formula mass | M1 |
| substituting 0.4 x 40 | M1 |
| 16 g | A1 |
| Question 2[3 marks] | |
|---|---|
| Answer or working | Marks |
| vaccination, reducing the number of people susceptible to the disease | B1 |
| isolating infected individuals from other people | B1 |
| good hygiene, such as hand washing or covering the mouth when coughing or sneezing | B1 |
| Final answer: Vaccination, isolating infected people, and good hygiene such as hand washing or covering coughs | |
| Question 3[3 marks] | |
|---|---|
| Answer or working | Marks |
| light intensity | B1 |
| carbon dioxide concentration | B1 |
| temperature | B1 |
| Final answer: Light intensity, carbon dioxide concentration, temperature | |
| Question 4[4 marks] | |
|---|---|
| Answer or working | Marks |
| substituting 15 x 9.8 | M1 |
| a weight of 147 N on Earth | A1 |
| substituting 15 x 1.6 | M1 |
| a weight of 24 N on the Moon | A1 |
| Final answer: 147 N on Earth; 24 N on the Moon | |
| Question 5[4 marks] | |
|---|---|
| Answer or working | Marks |
| salt as a product | B1 |
| water as a product | B1 |
| carbon dioxide gas as a product | B1 |
| stating the carbon dioxide can be tested by bubbling the gas through limewater, which turns cloudy (milky) | B1 |
| Final answer: salt + water + carbon dioxide; carbon dioxide turns limewater cloudy | |
| Question 6[4 marks] | |
|---|---|
| Answer or working | Marks |
| using the fact that the see-saw balances when the moments on each side are equal | M1 |
| substituting 300 x 1.5 = 250 x d | M1 |
| rearranging to d = (300 x 1.5) / 250 | M1 |
| 1.8 m | A1 |
| Question 7[4 marks] | |
|---|---|
| Answer or working | Marks |
| finding the number of 20-minute divisions in 3 hours, 180 / 20 = 9 | M1 |
| using 2 raised to the power of the number of divisions | M1 |
| 512 | A1 |
| stating the unit as bacteria (bacterial cells) | B1 |
| Final answer: 512 bacteria | |
| Question 8[5 marks] | |
|---|---|
| Answer or working | Marks |
| glucose as the reactant | B1 |
| ethanol as a product | B1 |
| carbon dioxide as a product | B1 |
| stating energy is released, though less than in aerobic respiration | B1 |
| a valid use, e.g. brewing alcoholic drinks or bread-making (carbon dioxide makes the dough rise) | B1 |
| Final answer: glucose -> ethanol + carbon dioxide (releasing energy); used in brewing and bread-making | |
| Question 9[5 marks] | |
|---|---|
| Answer or working | Marks |
| moles of HCl = 2.0 x (50 / 1000) | M1 |
| 0.1 mol | A1 |
| using the 2:1 mole ratio between HCl and MgCl2 from the equation | M1 |
| mass = moles x relative formula mass, 0.05 x 95 | M1 |
| 4.75 g | A1 |
| Question 10[5 marks] | |
|---|---|
| Answer or working | Marks |
| the drug group percentage, (175 / 250) x 100 | M1 |
| 70% | A1 |
| the placebo group percentage, (50 / 250) x 100 | M1 |
| 20% | A1 |
| finding the difference, 70 - 20 = 50 percentage points | B1 |
| Final answer: 70% improved with the drug compared with 20% with the placebo, a difference of 50 percentage points | |