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Science > Chemical Reactions > Flashcards

Chemical Reactions Flashcards

1
Q

What is it called when ice turns into water?

A

Melting

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2
Q

What is it called when water turns into ice?

A

Freezing

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3
Q

What is it called when water turns in to steam?

A

Evaporation

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4
Q

What is it called when steam turns into water?

A

Condensation

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5
Q

Zinc oxide before heating?

A

White solid (powder)

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6
Q

Zinc oxide after heating?

A

Yellow solid (powder)

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7
Q

Is zinc oxid reversible and irreversible?

A

Reversible

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8
Q

Copper sulfate before heating?

A

Blue solid (powder)

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9
Q

Copper sulfate after heating?

A

White solid (powder)

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10
Q

Is copper sulfate reversible or irreversible?

A

Irreversible

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11
Q

Magnesium ribbon before heating?

A

Grey solid (ribbon)

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12
Q

Magnesium ribbon after heating?

A

White ash- when burnt it became a bright light

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13
Q

Is the magnesium ribbon reversible or irreversible?

A

Irreversible

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14
Q

Copper carbonate before heating?

A

Green solid (powder)

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15
Q

Copper carbonate after heating?

A

Black solid

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16
Q

Is copper carbonate reversible or irreversible?

A

Irreversible

17
Q

Iodine crystals before heating

A

Black crystals

18
Q

Iodine crystals after heating?

A

Purple gas

19
Q

Is Iodine crystals reversible or irreversible

A

Reversible

20
Q

What is is called when a solid turns into a gas?

A

Sublimation

21
Q

Key points to describe a physical change?

A

No new substances.
Easily reversed
Small amount of heat required
No change in mass

22
Q

Key points to describe a chemical change?

A

A new substance formed. Can be seen by colour change…
Irreversible
Heat or energy taking in or given out
Change in mass

23
Q

Copper carbonate + heat=

A

Copper oxid + carbon dioxide

24
Q

When magnesium is heated a new white substance is formed. What is the name of this substance?

A

Magnesium oxid

Science (5 decks)

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