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IGCSE Chemistry Mock Exam > Review > Flashcards

Review Flashcards

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1
Q

Define a physical change of a substance.

A

A change of substances that does not alter the chemical properties of the substances

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2
Q

example of reversible reactions?

A

hydrated and anhydrous copper(II) Sulfate and Cobalt(II) Chloride

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3
Q

What is a nucleon number?

A

Total number of protons and neutrons in the nucleus.

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4
Q

All diatomic molecules

A

H, N, F, O, I, C, Br

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5
Q

What are isotopes?

A

Same number of protons, different number of neutrons

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6
Q

Why do isotopes share similar chemical properties?

A

They have the same number of electrons in the valence shell.

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7
Q

What is a homologous series?

A

A series of chemical compounds with similar chemical properties and with the same functional group.

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8
Q

Describe the general physical properties of metals as solids.

A

High MP and BP, good electrical and heat conductors, malleable

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9
Q

Why can metals conduct heat and electricity?

A

Sea of delocalised electrons

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10
Q

What is an alloy?

A

A mixture of a metal with another metal/non-metal substance (e.g steel)

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11
Q

What is steel made out of?

A

Iron and carbon

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12
Q

Explain why alloys are stronger than pure metals.

A

The atoms with different sizes disrupt the regular arrangement of metal and this prevents the metal layers from sliding over each other.

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13
Q

removing impurities (slag) from hematite

A

CaCO3

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14
Q

Name of a compound that contains iron oxide

A

Haematite

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15
Q

Name of aluminium ore

A

Bauxite

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16
Q

Name of copper ore

A

Malachite

17
Q

What is a displacement?

A

When a less reactive substance is replaced by a more reactive substance

18
Q

the trend of density of Alkali Metals

A

It gets less dense as it goes down the table

19
Q

The trend of reactivity of Alkali Metals

A

It gets stronger as it goes down the table

20
Q

Name 3 main substances for fertilisers

A

Nitrogen, Phosphorous, Potassium

21
Q

Why is Nitrogen used in fertiliser?

A

Required to produce protein which is essential for growth of plants

22
Q

Why is chlorine used in water treatment?

A

disinfection

23
Q

Effect of acid rain

A

chemical weathering

24
Q

What is galvanisation

A

Coating steel with a layer of zinc to prevent rusting

25
Q

Methods to prevent rusting

A

painting, oil, galvanising, sacrificial protection

IGCSE Chemistry Mock Exam (1 decks)

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