Reactions

Question 1

How much does each gas make up of air

Answer 1

Oxygen =21%
Nitrogen =78%
Argon=0.9%
CO2=0.037%

Question 2

Describe oxygen

Answer 2

Colourless
odourless gas
Slightly soluble

Question 3

What is oxygen used for

Answer 3

Welding torches
Rocket fuel
Reaching apparatuse

Question 4

Respiration equation

Answer 4

Sugar+oxygen ✔️ Carbon dioxide +water(+energy)

Question 5

Rustling equation

Answer 5

Iron+oxygen+water ✔️ Hydrated iron oxide

Question 6

Burning fuel equation

Answer 6

Fuel+oxygen ✔️ carbon dioxide+water+energy

Question 7

A fuel reacts with oxygen to release

Answer 7

Energy

Question 8

Chemical test for water

Answer 8

Presence of water turns anhydrous copper from white to blue

Question 9

Why can we collect oxygen over water

Answer 9

As it is only slightly soluble in water

Question 10

How do we prepare a sample of oxygen

Answer 10

By the decomposition of hydrogen peroxide using manganese’s dioxide as a catalyst

Question 11

What happens during the test for oxygen

Answer 11

Bubbles of gas can be seen and the test tube empties

Question 12

Concluded on the test for oxygen

Answer 12

Oxygen is prepared by “the decomposition of hydrogen peroxide
To speed this reaction up we used manganese dioxide. Manganese dioxide is a catalyst.

Question 13

What is the ets for oxygen

Answer 13

Relight a glowing splint

Question 14

Draw the apparatus for the preparation of oxygen

Answer 14

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

Question 15

Equation for the preps of oxygen

Answer 15

Manganese dioxide
Hydrogen peroxide ✔️ water+oxygen

Question 16

Catalyst

Answer 16

A catalyst is a chemical that speeds up an a reaction without being used up itself

Question 17

Iron as. A catalyst

Answer 17

Making ammonia from nitrogen and hydrogen

Question 18

Platinum as a catalyst

Answer 18

Making nitric acids from ammonia

Question 19

Vanadium (V)oxide as a catalyst

Answer 19

Making sulphuric acid

Question 20

Describe hydrogen

Answer 20

Colourless odourless gas

Question 21

Uses of hydrogen

Answer 21

Making margarine
Clean fuel
Rocket fuel

Question 22

Hydrogen is collected in a upward delivery tube because it is

Answer 22

Less dense than air

Question 23

How is hydrogen produced

Answer 23

By reacting magnesium with Hydrochloric acid.

Question 24

Draw the apparatus for the hydrogen

Answer 24

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

Question 25

What are the results of the test for hydrogen

Answer 25

Heat is given out Bubble of gas produce Lit splint will give a squeaky pop

Question 26

What did we conclude about hydrogen

Answer 26

Hydrogen can be prepared by an acid with a metal

Question 27

Word equation for preparation of hydrogen

Answer 27

“Magnesium + Hydrochloric Acid → Magnesium Chloride + Hydrogen”

Question 28

Science behind hindenburg

Answer 28

Hydrogen reacted with oxygen because of spark due to static e,electricity from journey

Question 29

Describe carbon dioxide

Answer 29

Colourless odourless gas

Question 30

Uses of carbon dioxide

Answer 30

Fizzy drinks Fire extinguisher Dry ice

Question 31

Carbon dioxide can be prepared easily by

Answer 31

Reacting a metal carbonate with acid

Question 32

Word equation for preparation of carbon dioxide

Answer 32

“Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon Dioxide” Excerpt From Year 9 Chemistry This material may be protected by copyright.

Question 33

Results for carbon dioxide

Answer 33

Bubbles of gas Metal carbonate disappears to give a clear solution Limewater water turns milky

Question 34

Test for carbon dioxide

Answer 34

Sun carbon dioxide is bubbled through limewater it turns it milky

Question 35

Draw the apparatus for testing for.p carbon dioxide

Answer 35

Side arm test tube with bung contains acid and marble chips. Downward delivery tube goes into test tube containing lime water

Question 36

An endothermic reaction

Answer 36

Takes in heat from the surrounding atmosphere and is then cooler than N the at,osphere

Question 37

Exothermic

Answer 37

Gives out heat so the reaction is warmer than the atmosphere

Question 38

How do you test if a reaction exothermic or endothermic

Answer 38

Pour chemicals in polystyrene cup measure temperature before and after reaction

Question 39

Thermal decomposition

Answer 39

Heat something up and it breaks down

Question 40

Oxidation

Answer 40

“An oxidation reaction occurs when a chemical reacts with oxygen. ” Excerpt From Year 9 Chemistry This material may be protected by copyright.

Question 41

Reduction

Answer 41

“Reduction is the opposite of oxidation and occurs when a substance loses oxygen” Excerpt From Year 9 Chemistry This material may be protected by copyright.

Question 42

When a reduction reaction can not occur by itself we. Use a

Answer 42

Reducing agent

Question 43

Reducing agent

Answer 43

“A substance which reduces another substance. ” Excerpt From Year 9 Chemistry This material may be protected by copyright.

Question 44

Redox reaction

Answer 44

“reaction in which REDUCTION AND OXIDATION takes place together.” Excerpt From Year 9 Chemistry This material may be protected by copyright.

Question 45

Thermite reaction

Answer 45

Highly exothermic “iron(III) oxide + aluminium → aluminium oxide + iron” Excerpt From Year 9 Chemistry This material may be protected by copyright.

Question 46

If copper oxide becomes copper

Answer 46

It has been reduced

Question 47

If carbon becomes carbon dioxide it has been

Answer 47

Oxidised