Gases in the atmosphere

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

what are the 4 main gases

Back (Answer)

nitrogen oxygen argon carbon dioxide

Front (Question)

approximate percentage of nitrogen gas in the atmosphere

Back (Answer)

78%

Front (Question)

approximate percentage of oxygen in the atmosphere

Back (Answer)

21%

Front (Question)

approximate percentage of argon gas in the atmosphere

Back (Answer)

0.9%

Front (Question)

approximate percentage of carbon dioxide in the atmosphere

Back (Answer)

0.04%

Front (Question)

EXPERIMENT to find % of oxygen using a non metal

Back (Answer)

• fill a trough with water and float an evaporating dish containing phosphorous • measure initial level of water • ignite phosphorous • immediately cover with bell jar • leave until flame extinguishes then measure final level of water • (water will rise and replace volume of oxygen the reacted with phosphorous) • compare water levels

Front (Question)

when finding out the % of oxygen, what do we need to be careful with

Back (Answer)

phosphorous as its toxic

Front (Question)

what equation do you use to find percentage of oxygen for non metal experiment

Back (Answer)

change in height of water / initial height of air x 100

Front (Question)

EXPERIMENT - how to figure out % of oxygen in atmosphere using metals

Back (Answer)

fill a burette up to the last mark with water • empty it into a measuring cylinder and record the volume • put wet iron filings into a burette • invert it and place into trough of water • record initial level of water • leave until level of water stops changing • record final level of water (

#10

Front (Question)

what equation do you use to find percentage of oxygen for metal experiment

Back (Answer)

change in volume of water/ initial volume of air × 100

#11

Front (Question)

what is combustion

Back (Answer)

scientific word for burning

#12

Front (Question)

all combustion reactions involve a chemical change when oxygen reacts with elements which produces

Back (Answer)

OXIDES

#13

Front (Question)

combustion reactions are ___ reactions because

Back (Answer)

exothermic they give out heat

#14

Front (Question)

observation of magnesium during combustion ( flame colour and what is produced)

Back (Answer)

intense white flame White powder produced (magnesium oxide)

#15

Front (Question)

observation of hydrogen during combustion ( what is produced)

Back (Answer)

its an exothermic reaction and water is produced

#16

Front (Question)

observation of sulfur during combustion ( flame colour and what is produced)

Back (Answer)

blue flame colourless, poisonous gas is produced

#17

Front (Question)

symbol equation for combustion of sulfur

Back (Answer)

S (s) + O₂ (g) → SO2 (g)

#18

Front (Question)

symbol equation for combustion of hydrogen

Back (Answer)

2H₂ (g) + O₂ (g) → 2H₂O (g)

#19

Front (Question)

symbol equation for combustion of magnesium

Back (Answer)

2Mg (s) + O₂ (g) → 2MgO (s)

#20

Front (Question)

what is thermal decomposition

Back (Answer)

term used to describe reactions where a substance breaks down due to the action of heat

#21

Front (Question)

metal carbonates combust to form (2)

Back (Answer)

metal oxide + carbon dioxide

#22

Front (Question)

thermal decomposition of copper carbonate: copper carbonate is a __(colour) powder which slowly ____ (colour) as ___-__– is produced

Back (Answer)

green powder darkens black copper oxide

#23

Front (Question)

how can the carbon dioxide given off in thermal decompositions be tested

Back (Answer)

The carbon dioxide given off can be tested by passing the gas through limewater and looking for it to turn milky

#24

Front (Question)

3 greenhouse gases

Back (Answer)

carbon dioxide methane water vapour