Chemical reactions Flashcards

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1
Q

What is a combustion reaction

A

A combustion reaction is when fuel, oxygen and heat are present which results in burning. The fuel reacts with the oxygen to produce heat.

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2
Q

What are the products of combustion when there is plenty of oxygen present

A

Carbon dioxide and water

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3
Q

Is a combustion reaction exothermic or endothermic

A

Exothermic

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4
Q

What is an endothermic reaction

A

It is a reaction when heat is taken in from the surroundings

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5
Q

What is an exothermic reaction

A

It is a reaction when heat is give out

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6
Q

What are the products of combustion when oxygen is in limited supply

A

Carbon monoxide and water

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7
Q

Give four examples of fuels

A

Methane, oil, wood, coal and wax

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8
Q

How would you put out a combustion reaction

A

our would take away one of the necessary components for combustion

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9
Q

What type of reaction is oxidation

A

It is a reaction where oxygen is added to a substance

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10
Q

When is an oxide formed

A

When only oxygen is added to a substance

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11
Q

What are three ways of knowing that a chemical reaction has occurred

A

A colour change, a temperature change and a new product formed

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12
Q

When can rusting occur

A

When iron comes into contact with water and oxygen.

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13
Q

What is thermal decomposition

A

It is when heat breaks down a substance

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14
Q

Is thermal decomposition a endothermic of exothermic reaction

A

Endothermic

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15
Q

What is a catalyst

A

It is a substance which speeds up chemical reactions by taking the route which requires less activation energy

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16
Q

What is a chemical reaction

A

It is a reaction where two or more reactants react to form different products. Mass and energy are both conserved

17
Q

What numbers are on the pH scale

A

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14

18
Q

What numbers are acids

A

1,6

19
Q

What number is neutral

A

7

20
Q

What numbers are alkalis

A

8, 14

21
Q

What is neutralisation

A

It is when you add an acid and a alkali to make a neutral