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GCSE Chemistry
8. Chemical analysis
8.2 Identification of common gases
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Cards (51)
Hydrogen gas produces a squeaky pop sound when
lit
Chlorine gas bleaches damp litmus
paper
Oxygen is a colorless and odorless gas that supports
combustion
.
True
Hydrogen is a colorless and
odorless
gas.
True
Order the chemical tests for identifying common gases based on their observations:
1️⃣ Hydrogen: Squeaky pop sound when lit
2️⃣ Oxygen: Relights a glowing splint
3️⃣ Carbon dioxide: Forms a white precipitate with limewater
4️⃣ Chlorine: Bleaches damp litmus paper
5️⃣ Ammonia: Turns damp red litmus paper blue
Chlorine gas turns damp litmus paper blue.
False
Arrange the following gases in alphabetical order:
1️⃣ Ammonia
2️⃣ Carbon dioxide
3️⃣ Chlorine
4️⃣ Hydrogen
5️⃣ Oxygen
Match the gas with its identifying test:
Oxygen ↔️ Relights a glowing splint
Hydrogen ↔️ Produces a squeaky pop sound
Chlorine ↔️ Bleaches damp litmus paper
Ammonia ↔️ Turns damp red litmus paper blue
What is the density of carbon dioxide relative to air?
Denser than air
What happens to damp litmus paper when exposed to chlorine gas?
It bleaches
What is the physical property of chlorine that helps identify it?
Pungent odor
Oxygen gas relights a glowing splint.
True
Ammonia gas turns damp red
litmus paper
blue.
True
Carbon dioxide is a colorless, odorless gas that is denser than
air
What is the density of carbon dioxide relative to air?
Denser than air
What happens when a glowing splint is brought to oxygen gas?
Relights the glowing splint
What sound is produced when hydrogen gas is ignited with a lit splint?
Squeaky pop sound
Which gas is the lightest of all gases?
Hydrogen
It is safe to handle toxic gases without personal protective equipment in a well-ventilated area.
False
Oxygen relights a glowing
splint
Ammonia turns damp red litmus paper
blue
Match the gas with its chemical test observation:
Hydrogen ↔️ Squeaky pop sound
Oxygen ↔️ Relights a glowing splint
Carbon dioxide ↔️ Forms a white precipitate
Chlorine ↔️ Bleaches damp litmus paper
When handling gases, it is crucial to be aware of their physical
properties
Carbon dioxide forms a white
precipitate
when bubbled through limewater.
Hydrogen is the lightest of all
gases
Which gases mentioned in the study material are toxic or corrosive?
Chlorine and ammonia
Steps to identify an unknown gas in a chemistry lab
1️⃣ Observe its physical properties
2️⃣ Perform relevant chemical tests
3️⃣ Confirm its identity
Working in a well-ventilated area reduces the risk of
hazardous
gas buildup.
True
Oxygen relights a glowing splint.
True
Ammonia turns damp red litmus paper
blue
.
True
Wearing safety goggles is essential when identifying gases in a
chemistry lab
.
True
Adhering to safety guidelines protects both yourself and others in the
lab
.
True
What type of PPE should you wear when working with common gases in a lab?
Safety goggles, gloves, lab coat
What are the common gases that can be identified in a chemistry lab?
Hydrogen, oxygen, carbon dioxide, chlorine, ammonia
What does carbon dioxide form when bubbled through limewater?
White precipitate
Which gas is the lightest of all gases?
Hydrogen
What is the color and odor of chlorine gas?
Greenish-yellow, pungent
Hydrogen is the lightest of all
gases
Carbon dioxide bubbled through limewater forms a white
precipitate
What happens to damp red litmus paper when exposed to ammonia gas?
Turns the litmus paper blue
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