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Chemistry year 8 > Topic 2 - (reactions) > Flashcards

Topic 2 - (reactions) Flashcards

1
Q

What does the law of conservation of mass mean?

A

That mass is never lost or gained in chemical reactions

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2
Q

If the ………. is a gas, you will observe a mass increase

A

reactant

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3
Q

If the ………. is a gas, you will observe a mass decrease

A

Product

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4
Q

What is combustion?

A

When a fuel reacts with oxygen to release energy

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5
Q

What are 3 things needed to make a combustion?

A
  • fuel
  • heat
  • oxygen
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6
Q

What is oxidation?

A

When a substance reacts and combines with oxygen

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7
Q

Combustion is a type of ………… reaction

A

Oxidation

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8
Q

What is the equation of rusting?

A

Iron + oxygen - iron oxide (rust)

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9
Q

What is iron oxide?

A

Rust

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10
Q

Exothermic reactions….

A

Release heat

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11
Q

Endothermic reactions….

A

Take in heat

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12
Q

Which reactions are exothermic?

A

Neutralisation and oxidation

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13
Q

Which reactions are more common? Exothermic or endothermic?

A

Exothermic

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14
Q

Which reactions are also endothermic reactions?

A

Thermal decomposition reactions

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15
Q

What is a thermal decomposition reaction?

A

A reaction that uses heat to break down a substance into smaller molecules

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16
Q

What is an example of a thermal decomposition reaction?

A

CaCO3 - CaO + CO2

Making lime from lime water!

17
Q

What do carbonates produce when they decompose?

A

Carbon dioxide

18
Q

Name 3 uses of thermal decomposition reactions

A
  • Making lime from lime water
  • Extracting Mercury
  • Thermal cracking
19
Q

What is a precipitation reaction?

A

A reaction in which a solid is made

20
Q

What is the precipitate in a reaction?

A

The solid

21
Q

What does the state symbol (aq) mean?

A

Dissolved into solution

22
Q

What do reactions involve?

A

A transfer in energy

23
Q

What is an example of a precipitation reaction? And what is the precipitate

A

Potassium iodide (aq) + lead nitrate (aq) - potassium nitrate (aq) + lead iodide (s)

Precipitate: LEAD IODIDE (s)

24
Q

What is CaCO3?

A

Limestone

25
Q

What is iron oxide? ( FeO)

A

Rust

26
Q

In a chemical reaction, WHY is there no change in mass?

A

Because you can’t create or destroy atoms

27
Q

What can oxidation reactions be used to make?

A

Acids and bases

28
Q

What is an example of an endothermic reaction?

A
  • Sodium hydrogen carbonate + hydrochloric acid

- photosynthesis

Chemistry year 8 (3 decks)

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