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Chemistry- year 8 > Changes on heating chemicals > Flashcards

Changes on heating chemicals Flashcards

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1
Q

What is a physical change?

A

A physical change is when a substance changes without forming new substances, like changing state or colour. This change is usually reversible

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2
Q

What is a chemical change?

A

A chemical change is when a substance changes completely, involving the creation of new substances. This change is usually irreversible.

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3
Q

What does wax look like before heating, during heating, and after heating?

A

White solid, colourless liquid, white solid

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4
Q

What does ice look like before heating, during heating, and after heating?

A

Colourless solid, colourless liquid, colourless liquid

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5
Q

What does sodium chloride look like before heating, during heating, and after heating?

A

White solid, white solid, white solid

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6
Q

What does Ammonium chloride look like before heating, during heating, and after heating?

A

White solid, white gas, white solid

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7
Q

What does zinc oxide look like before heating, during heating, and after heating?

A

White solid, yellow solid, white solid

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8
Q

What colour is zinc oxide when you heat it?

A

Yellow

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9
Q

How does wax change when you heat it?

A

It melts to become a colourless liquid

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10
Q

What is the transition from a liquid to a solid?

A

Freezing

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11
Q

What is the transition from a liquid to a gas?

A

Evaporating

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12
Q

What is the transition from a gas to a liquid?

A

condensation

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13
Q

What is the transition from a solid to a gas?

A

sublimation

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14
Q

How can you tell if something has chemically changed?

A

chemical changes can change colour, smell, releases light or gases, give off or take in heat

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15
Q

What is thermal decomposition?

A

the breaking down of a substance because of heat (in decomposition there is always more products than reactants)

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16
Q

What is synthesis?

A

when two substances are combined to form a new one (in synthesis there is always more reactants that products)

17
Q

What are reactants?

A

the substances that you start with

18
Q

What are products?

A

the substances that are made (produced) as a result of chemical change

19
Q

What happens to the mass of a substance when it decomposes?

A

it loses mass

20
Q

What happens to the mass of a substance when it synthesises?

A

it gains mass

21
Q

What is the colour of Copper (ll) carbonate before heating?

A

green

22
Q

What is the colour of the new solid created after Copper (ll) carbonate is heated?

A

black

23
Q

How do we know if a substance has carbon dioxide in it?

A

it turns lime water milky white

24
Q

What happened to the mass of copper (ll) carbonate when it was heated?

A

it decreased because carbon dioxide was released and it undergoes thermal decomposition

25
Q

Why is carbon dioxide released from copper (ll) carbonate?

A

because it’s being heated

26
Q

What is the word equation for the heating of copper (ll) carbonate?

A

copper (ll) carbonate→copper (ll) oxide + carbon dioxide

27
Q

Does copper (ll) carbonate go through a physical or chemical change when heated?

A

chemical change because it undergoes thermal decomposition

28
Q

What colour is copper (ll) sulphate before heating?

A

blue

29
Q

what colour is copper (ll) sulphate after heating?

A

white

30
Q

What happens as the copper (ll) sulphate crystals are being heated?

A

the water evaporates, the colour changed, and there was condensation

31
Q

Is the heating of copper (ll) sulphate a physical or chemical change?

A

chemical change because it undergoes thermal decomposition (its mass decreases)

32
Q

Is the heating of copper (ll) sulphate reversible or irreversible?

A

reversible, if you put water on a sample of anhydrous copper (ll) sulphate, it will turn from white to blue again

33
Q

What is lost by the copper (ll) sulphate crystals as they are being heated?

A

water

34
Q

what are crystals that contain water called?

A

hydrated

35
Q

What is the solid called after the water has been lost by the crystals?

A

anhydrous

36
Q

What is the word equation for the heating of copper (ll) sulphate?

A

hydrated copper (ll) sulphate ⇌ anhydrous copper (ll) sulphate + water

37
Q

What does “⇌” mean?

A

that the process is reversible

38
Q

What suggests that water is given out when copper (ll) sulphate is heated?

A

a colourless gas is given off, which condenses to a colourless liquid on the cooler parts of the tube

39
Q

What is a reaction with oxygen called?

A

oxidation

Chemistry- year 8 (6 decks)

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