Question 1: Define Carbon Dioxide and state its chemical formula.

Answer: Carbon Dioxide is a colourless gas with the chemical formula CO₂.

Question 2: Explain the principle behind the Limewater test for Carbon Dioxide.

Answer: When Carbon Dioxide is bubbled through Limewater, it reacts to form calcium carbonate, causing the Limewater to turn milky or cloudy.

Question 3: What safety precautions should be taken when conducting gas tests involving Carbon Dioxide?

Answer: Ensure good ventilation, avoid inhaling concentrated gas, and handle chemicals like Limewater safely.

Question 1: Calculate the volume of Carbon Dioxide produced at room temperature and pressure (RTP) when 0.5 mol of calcium carbonate reacts with acid. (Use 1 mol of gas occupies 24 dm³ at RTP).

Answer: 12 dm³

Question 2: If 2.0 litres of Carbon Dioxide are collected at room temperature and pressure, how many moles of CO₂ are present? (Use 24 dm³ per mol).

Answer: 0.083 mol

Question 1: Describe the steps involved in testing for Carbon Dioxide using Limewater, including how to identify positive results.

Answer: Pass the gas through Limewater in a test tube or delivery tube. If the Limewater turns milky or cloudy, the test is positive for Carbon Dioxide. Ensure the test setup is secure, and handle Limewater carefully to avoid spills and inhalation of fumes.

Question 1: In an experiment, 50 cm³ of a gas was bubbled through Limewater, which turned milky. What does this indicate about the gas? Explain your answer.

Answer: The gas is Carbon Dioxide because it reacts with Limewater to produce a milky precipitate of calcium carbonate.

Question 2: A student collected 48 dm³ of gas over water and measured that 2 dm³ of this gas was Carbon Dioxide. What percentage of the gas sample was Carbon Dioxide?

Answer: 4.17%

Question 1: Explain how Carbon Dioxide emissions contribute to climate change and one method used to reduce these emissions in industry.

Answer: Carbon Dioxide is a greenhouse gas that traps heat in the atmosphere, contributing to global warming. Industry reduces emissions through methods like carbon capture and storage, using renewable energy sources, and improving energy efficiency.

Question 2: Which of the following is a common use of Carbon Dioxide in industry? A) As a fuel B) In carbonated beverages C) As a solvent D) In plastic manufacturing

Answer: B) In carbonated beverages