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KS3 SCIENCE 11TH MARCH 2025 Flashcards | StudBud
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KS3 SCIENCE 11TH MARCH 2025
KS3 SCIENCE 11TH MARCH 2025
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1
In an endothermic reaction, the surroundings will feel:
unchanged in temperature.
It depends on the catalyst
colder
warmer
2
What is the effect of a catalyst on the activation energy?
Has no effect.
Increases it.
Decreases it.
Doubles it.
3
Which substance has the highest boiling point?
Water
Ethanol
They are all the same
Aluminum
4
What is a reactant in the rusting of iron?
Oxygen
Hydrogen
Water
Carbon dioxide
5
Rusting is an example of:
Reduction.
Combustion.
Oxidation.
Thermal decomposition.
6
"Endo-" means:
Out
Within
Around
In
7
What is the approximate boiling point of ethanol?
2520°C
0°C
78°C
100°C
8
What is the boiling point of pure water?
100°C
0°C
Both b and c
212°F
9
What type of reaction is generally easier to spot in a chemistry lab due to visible effects?
Exothermic
Both are equally easy to spot
Endothermic
Neither is easy to spot without special equipment
10
What does "endo" indicate about a reaction?
It releases energy.
It requires a catalyst.
It absorbs energy.
It involves oxygen.
11
Which type of reaction usually involves a fall in temperature?
Combustion
Neutralization
Exothermic
Endothermic
12
What three things are needed for combustion?
Fuel, oxygen, and heat.
Fuel, water, and heat.
Fuel, oxygen, and light.
Oxygen, water, and heat.
13
What is produced when copper(II) carbonate is heated?
Copper(II) oxide and carbon dioxide.
Copper and carbon dioxide.
Copper(I) oxide and carbon monoxide.
Copper and carbon monoxide.
14
What is an example of thermal decomposition?
Neutralizing an acid with a base.
Rusting iron.
Burning wood.
Heating copper(II) carbonate.
15
What is a common everyday use of an endothermic reaction?
Cooking food
Sports injury packs
Burning a candle
A fire
16
What is thermal decomposition?
A reaction that releases a large amount of energy.
The breakdown of a substance by heat.
The combining of substances to form a new one.
A reaction that requires oxygen.
17
What is combustion?
A rapid reaction with oxygen producing heat and light.
The breakdown of a substance by heat.
The gain of oxygen by a substance.
A reaction that absorbs energy.
18
A pure substance has a fixed:
density
volume
melting and boiling point.
color
19
What substance is often refined using fractional distillation?
Salt water
Ethanol
Water
Crude oil
20
Which of these is NOT true about catalysts?
They speed up reactions.
They change the products of a reaction.
They are not consumed in the reaction.
They lower activation energy.
21
Which of the following is NOT a product of hydrocarbon combustion?
Water
Carbon dioxide
Energy
Oxygen
22
What is a catalyst's primary role in a chemical reaction?
To change the products.
To alter the reaction rate.
To act as a reactant.
To provide energy.
23
What do catalysts do?
Prevent chemical reactions.
Slow down chemical reactions.
Have no effect on chemical reactions.
Speed up chemical reactions.
24
Which is a good example of an endothermic reaction?
Respiration.
Neutralization reaction.
Burning a candle.
Thermal decomposition.
25
Is rusting a fast or slow process?
Fast
It depends on temperature
Instantaneous
Slow
26
In combustion, what is the role of oxygen?
To provide energy.
To slow the reaction.
To act as a catalyst.
To be a reactant.
27
What is a common everyday use of an exothermic reaction?
Sports injury packs
Hand warmers
Photosynthesis
Ice melting
28
Impurities in a substance will cause its boiling point to:
be lower.
fluctuate randomly.
be higher.
remain unchanged.
29
What common everyday item uses an endothermic reaction for its function?
A battery
A match
An instant cold pack
A hand warmer
30
Endothermic reactions:
Always require a catalyst.
Do not involve heat transfer.
Absorb heat from the surroundings.
Release heat to the surroundings.
31
What is a disadvantage of using catalysts in industry?
They always increase reaction yield.
They can be poisoned by impurities.
They are easy to obtain.
They are inexpensive.
32
Does thermal decomposition require another reactant besides the substance being decomposed?
Yes
Only in certain cases
No
Sometimes
33
Which is the best example of an exothermic reaction?
Dissolving ammonium nitrate in water.
Photosynthesis.
Combustion.
Thermal decomposition.
34
What is the purpose of the fractionating column in fractional distillation?
To act as a catalyst
To increase the pressure
To provide many surfaces for condensation and vaporization
To increase the temperature
35
What is produced during the combustion of hydrocarbons?
Carbon dioxide and hydrogen.
Carbon monoxide and water.
Carbon monoxide and hydrogen.
Carbon dioxide and water.
36
What is oxidation?
The gain of hydrogen.
The gain of oxygen.
The loss of oxygen.
The loss of hydrogen.
37
Are catalysts consumed in a reaction?
Only in exothermic reactions.
No, they are not used up.
Sometimes they are used up, sometimes not.
Yes, they are used up.
38
Exothermic reactions:
Absorb heat from the surroundings.
Always involve a catalyst.
Do not involve heat transfer.
Release heat to the surroundings.
39
What is the melting point of pure ice?
273 K
0°C
0°C
All of the above
40
In an exothermic reaction, the surroundings will feel:
warmer
unchanged in temperature.
colder
It depends on the catalyst.
41
What is the main difference between simple and fractional distillation?
Temperature used
The type of liquid being distilled
The number of components in the mixture
Whether a catalyst is used
42
What is the process called when a substance breaks down into simpler substances upon heating?
Combustion
Oxidation
Neutralization
Thermal Decomposition
43
How does a catalyst typically affect the activation energy of a reaction?
It decreases it.
It makes it fluctuate.
It has no effect.
It increases it.
44
In thermal decomposition, what is NOT needed?
Heat.
A catalyst.
A substance to decompose.
Another reactant.
45
What does "exo" indicate about a reaction?
It involves oxygen.
It releases energy.
It absorbs energy.
It requires a catalyst.
46
What are hydrocarbons?
Substances containing only hydrogen and oxygen.
Substances containing only hydrogen and carbon.
Substances containing only carbon and nitrogen.
Substances containing only oxygen and nitrogen.
47
Which type of reaction usually involves a rise in temperature?
Exothermic
Oxidation
Endothermic
Thermal decomposition
48
Combustion is a type of:
Thermal decomposition.
Endothermic reaction.
Reduction reaction.
Oxidation reaction.
49
What is a common example of a catalyst?
Water
Oxygen
Carbon dioxide
Platinum
50
"Exo-" means:
Around.
Out.
In.
Within.
