This hub gathers the original practice for Co-ordinated Sciences (Double Award) 0654. It starts with a short three-question warm-up with full answers, then links to the practice set for each module. The original mixed-practice builder can assemble a printable session from the reviewed bank.
All questions are written for learning. They are not exam papers and they do not predict any exam.
Warm-up: three questions, one per science
Write your working first. Then open each answer.
1. Physics. A trolley has mass 2.0 kg. Take g = 10 N/kg. What is its weight?
Show answer
Weight = mass × g = 2.0 × 10 = 20 N. The mass stays 2.0 kg, and the weight is a force, so the unit is the newton. If the question gave a different value of g, you would use that one.
2. Chemistry and Biology. Photosynthesis follows the equation 6CO2 + 6H2O → C6H12O6 + 6O2. A leaf makes 0.10 mol of glucose. What mass of carbon dioxide does it take in? (Relative formula mass of CO2 = 44.)
Show answer
The equation needs 6 mol of CO2 for every 1 mol of glucose. So moles of CO2 = 6 × 0.10 = 0.60 mol. Mass = 0.60 × 44 = 26.4 g.
A common slip is to forget the ratio of 6 and answer 4.4 g, which is only 0.10 mol of CO2.
3. Biology, with data handling. A potato strip has mass 5.0 g. After an hour in a salt solution its mass is 4.4 g. Calculate the percentage change in mass and say what happened to the water.
Show answer
Change = 4.4 − 5.0 = −0.6 g. Percentage change = −0.6 ÷ 5.0 × 100 = −12%, a 12% decrease.
The strip lost water by osmosis. Water moved from the cells, where the solution was more dilute, into the surrounding salt solution, which was more concentrated, through the partially permeable cell membranes.
Which practice set next?
Use your tracker from the study route to choose. Each set has original mixed questions with explanations.
| Module practice set | Choose it when |
|---|---|
| Double-award scope and entry | You are not yet sure which resources match your course |
| Integrated biological reasoning | Biology questions stop you when they mix with calculations |
| Integrated chemical reasoning | You explain ideas but lose marks on quantity work |
| Integrated physical reasoning | Forces, energy or circuits feel disconnected |
| Three-science numerical fluency | Units and formulas slip in every science |
| Cross-topic experimental evaluation | You find it hard to judge a method or dataset |
| Double-award practice design | One science keeps getting less time |
| Revision and transition decisions | You are deciding revision priorities near the exam |
How to get the most from a set
- Choose by gap. Pick the set that matches your red topics, not your favourite science.
- Work closed-notes. Notes stay shut until you have an answer written down.
- Mark the reasoning. A correct final number with a wrong method is still a gap.
- Log and retest. Use the mistake log and come back with a fresh question.
If a word in an answer is unfamiliar, the terminology page explains the pair in context. For the map around all of this, see the Co-ordinated Sciences learning guide.
When does a teacher add something?
Explained answers show you the route. They cannot ask you what you were thinking at the point you went wrong. A teacher can, which is why students who can follow solutions but cannot start questions sometimes value online one-to-one Co-ordinated Sciences tuition.