Gases In The Atmosphere
Overview
The air around you is a mixture of gases, and each one plays a role in the chemistry of our planet. Knowing what the atmosphere is made of, how to measure it, and what happens when elements burn in oxygen connects laboratory chemistry to global issues like climate change.
In this lesson you will learn the composition of dry air, how to determine the percentage of oxygen experimentally, what happens when magnesium, hydrogen, and sulfur burn in oxygen, and why rising carbon dioxide levels are a cause for concern.
Objectives
- Know the approximate percentages by volume of the four most abundant gases in dry air
- Understand how to determine the percentage by volume of oxygen in air using experiments involving the reactions of metals and non-metals with air
- Describe the combustion of elements in oxygen, including magnesium, hydrogen and sulfur
- Know that carbon dioxide is a greenhouse gas and that increasing amounts in the atmosphere may contribute to climate change
- Determine the approximate percentage by volume of oxygen in air using a metal or a non-metal
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Gases In The Atmosphere. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which gas is most abundant in dry air? A) Oxygen B) Carbon dioxide C) Nitrogen D) Argon Answer: C
- The approximate percentage of oxygen in dry air is: A) 0.04% B) 0.9% C) 21% D) 78% Answer: C
- When magnesium burns in oxygen, the product is: A) Magnesium hydroxide B) Magnesium oxide C) Magnesium carbonate D) Magnesium sulfate Answer: B
- Carbon dioxide is classified as a greenhouse gas because it: A) Is produced by plants B) Absorbs infrared radiation C) Is colourless D) Is denser than air Answer: B
- In the copper experiment, the copper turns black because: A) It melts B) It reacts with nitrogen C) It forms copper(II) oxide D) Carbon is deposited on it Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
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