Oxygen: Calculations & Formulae
Science
Grade 7
8 questions
~16 mins
1 views0 downloads
About This Worksheet
A Chemistry worksheet covering the properties, tests, and calculations related to Oxygen for Grade 7 students.
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Oxygen: Calculations & Formulae
Subject: ScienceGrade: Grade 7
Name:
Date:
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Untitled Worksheet
Grade Grade 7
A
Concept Review
Answer the following questions to review your understanding of oxygen and its properties.
1.
Define oxygen and describe its role in combustion reactions.
[2 marks]2.
Explain why oxygen is classified as a diatomic molecule.
[2 marks]B
Calculations
Solve the following numerical problems related to oxygen gas. Show your working clearly.
1.
Calculate the volume of oxygen gas (in liters) at STP that contains 32 grams of oxygen. (Molar mass of O₂ = 32 g/mol)
[4 marks]2.
If 10 liters of oxygen gas reacts completely with hydrogen to form water, how many grams of water are produced? (Molar mass of H₂O = 18 g/mol)
[4 marks]C
Practical Skills & Safety
Answer the following based on theoretical understanding of oxygen experiments.
1.
Describe a simple experiment to test for the presence of oxygen gas. Include the safety precautions that should be taken.
[3 marks]D
Data Analysis & Interpretation
Read the following scenario and answer the questions.
1.
A sample of gas collected over water contains 20% oxygen and 80% nitrogen by volume. Explain how this composition affects its use in supporting combustion.
[2 marks]E
Exam-Style & Application Questions
Answer the following questions to demonstrate your understanding of oxygen in real-world contexts.
1.
Explain how oxygen therapy is used in medical treatments and why it is important for patients with respiratory issues.
[6 marks]2.
Which of the following is a typical safety precaution when handling oxygen cylinders? (Options: a) Keep away from flames, b) Store in a cool, dry place, c) Handle with care to avoid breaking, d) All of the above.
Aa) Keep away from flames
Bb) Store in a cool, dry place
Cc) Handle with care to avoid breaking
Dd) All of the above
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Details
- Created
- 1/1/2026
- Updated
- 1/1/2026
- Type
- worksheet