Reactions Flashcards
How much does each gas make up of air
Oxygen =21%
Nitrogen =78%
Argon=0.9%
CO2=0.037%
Describe oxygen
Colourless
odourless gas
Slightly soluble
What is oxygen used for
Welding torches
Rocket fuel
Reaching apparatuse
Respiration equation
Sugar+oxygen ✔️ Carbon dioxide +water(+energy)
Rustling equation
Iron+oxygen+water ✔️ Hydrated iron oxide
Burning fuel equation
Fuel+oxygen ✔️ carbon dioxide+water+energy
A fuel reacts with oxygen to release
Energy
Chemical test for water
Presence of water turns anhydrous copper from white to blue
Why can we collect oxygen over water
As it is only slightly soluble in water
How do we prepare a sample of oxygen
By the decomposition of hydrogen peroxide using manganese’s dioxide as a catalyst
What happens during the test for oxygen
Bubbles of gas can be seen and the test tube empties
Concluded on the test for oxygen
Oxygen is prepared by “the decomposition of hydrogen peroxide
To speed this reaction up we used manganese dioxide. Manganese dioxide is a catalyst.
What is the ets for oxygen
Relight a glowing splint
Draw the apparatus for the preparation of oxygen
Side arm test tube is held by a clamp .I contains hydrogen peroxide and manganese dioxide catalyst . Delivery tube connects to test tube over a water trough
Equation for the preps of oxygen
Manganese dioxide
Hydrogen peroxide ✔️ water+oxygen
Catalyst
A catalyst is a chemical that speeds up an a reaction without being used up itself
Iron as. A catalyst
Making ammonia from nitrogen and hydrogen
Platinum as a catalyst
Making nitric acids from ammonia
Vanadium (V)oxide as a catalyst
Making sulphuric acid
Describe hydrogen
Colourless odourless gas
Uses of hydrogen
Making margarine
Clean fuel
Rocket fuel
Hydrogen is collected in a upward delivery tube because it is
Less dense than air
How is hydrogen produced
By reacting magnesium with Hydrochloric acid.
Draw the apparatus for the hydrogen
Retort stand has clamped on a side arm test tube with a bung on top. In side there is magnesium and hydrochloric acid. There is then an upward delivery tube with test tube ontop
What are the results of the test for hydrogen
Heat is given out
Bubble of gas produce
Lit splint will give a squeaky pop
What did we conclude about hydrogen
Hydrogen can be prepared by an acid with a metal
Word equation for preparation of hydrogen
“Magnesium + Hydrochloric Acid → Magnesium Chloride + Hydrogen”
Science behind hindenburg
Hydrogen reacted with oxygen because of spark due to static e,electricity from journey
Describe carbon dioxide
Colourless odourless gas
Uses of carbon dioxide
Fizzy drinks
Fire extinguisher
Dry ice
Carbon dioxide can be prepared easily by
Reacting a metal carbonate with acid
Word equation for preparation of carbon dioxide
“Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon Dioxide”
Excerpt From
Year 9 Chemistry
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Results for carbon dioxide
Bubbles of gas
Metal carbonate disappears to give a clear solution
Limewater water turns milky
Test for carbon dioxide
Sun carbon dioxide is bubbled through limewater it turns it milky
Draw the apparatus for testing for.p carbon dioxide
Side arm test tube with bung contains acid and marble chips. Downward delivery tube goes into test tube containing lime water
An endothermic reaction
Takes in heat from the surrounding atmosphere and is then cooler than
N the at,osphere
Exothermic
Gives out heat so the reaction is warmer than the atmosphere
How do you test if a reaction exothermic or endothermic
Pour chemicals in polystyrene cup measure temperature before and after reaction
Thermal decomposition
Heat something up and it breaks down
Oxidation
“An oxidation reaction occurs when a chemical reacts with oxygen. ”
Excerpt From
Year 9 Chemistry
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Reduction
“Reduction is the opposite of oxidation and occurs when a substance loses oxygen”
Excerpt From
Year 9 Chemistry
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When a reduction reaction can not occur by itself we. Use a
Reducing agent
Reducing agent
“A substance which reduces another substance. ”
Excerpt From
Year 9 Chemistry
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Redox reaction
“reaction in which REDUCTION AND OXIDATION takes place together.”
Excerpt From
Year 9 Chemistry
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Thermite reaction
Highly exothermic
“iron(III) oxide + aluminium → aluminium oxide + iron”
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Year 9 Chemistry
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If copper oxide becomes copper
It has been reduced
If carbon becomes carbon dioxide it has been
Oxidised
