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Science - Year 8 > Chemistry - Thermal décomposition > Flashcards

Chemistry - Thermal décomposition Flashcards

1
Q

What do chemical reactions involve

A

Re arranging atoms

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2
Q

Do chemical reactions always make new substances ?

A

Yes

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3
Q

Chemical reactions are easily reversable- true or false

A

False

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4
Q

Do chemical reactions involve energy transfers ?

A

Yes

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5
Q

What do physical changes include ?

A

Change of substance these reactions are reversable

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6
Q

Fuel + oxygen =>carbon dioxide + ………

A

Water

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7
Q

What are the things before the line called ?

A

They are called reactants

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8
Q

What are the things after the line ?

A

Products of the chemical reaction

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9
Q

Is methane a fuel ?

A

Yes

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10
Q

Do fuels burn in a chemical reaction ?

A

Yes

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11
Q

What is a fuel ?

A

It is a material that burns to transfer energy by heating

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12
Q

Name 4 fuels

A

Petrol,diesel,coal,hydrogen

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13
Q

What is burning also called ?

A

Combustion

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14
Q

What is methane a compound of ?

A

Carbon and hydrogen

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15
Q

Is making iron sulphide from iron + sulphur a chemical reaction

A

Yes

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16
Q

In a chemical reaction are the properties different ?

A

Yes the properties of the product are different to the properties of the reactant . A new substance is made

17
Q

What is a decomposition reaction ?

A

This is wher compunds break down into simpler compounds or elements

18
Q

What are the products of a thermal decomposition reaction of lead carbonate

A

Lead carbonated => lead oxide + carbon dioxide

19
Q

What is a discrete variable

A

This is something that is described by words or by numbers that can only have a certain value such as a shoe size

20
Q

What is a exothermic reaction ?

A

This is a reaction that gives out more heat energy to the surroundings than they take in so they feel hot and the tempreture rises

21
Q

What is and endothermic reaction ?

A

This is where it takes in more heat from the surroundings than they give out so they feel cold and the tempreture falls

Science - Year 8 (3 decks)

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