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Chemistry Edexcel > Key Concepts in Chemistry > Flashcards

Key Concepts in Chemistry Flashcards

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1
Q

Mass of an electron

A

~0 (negligible)

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2
Q

Isotope

A

Atoms with the same atomic number but different mass number/same proton number but different neutron number

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3
Q

Atom

A

Tiny particles that make up all matter

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4
Q

Mixture

A

Two or more types of substances NOT chemically bonded

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5
Q

Period

A

How many shells are present

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6
Q

Group

A

How many electrons are in the outer shell

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7
Q

How is Mendeleev’s periodic table sorted?

A

In order of atomic mass

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8
Q

Why were there gaps in Mendeleev’s periodic table?

A

For undiscovered elements

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9
Q

Ionic Bonding

A

Transfer/donation of electrons between metals and non-metals

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10
Q

Covalent Bonding

A

Share of electrons between non-metals

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11
Q

Strong electrostatic forces

A

Ionic compound

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12
Q

Arranged regularly

A

Ionic compound

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13
Q

High melting points

A

Ionic compound

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14
Q

Giant ionic lattice of oppositely charged ions

A

Ionic compound

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15
Q

What happens when 2 different elements combine?

A

The end of the non-metal changes to -ide (chloride)

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16
Q

Are soluble

A

Ionic compound

17
Q

What happens when 2 different elements combine with oxygen?

A

The end of the non-metal changes to -ate (chlorate)

18
Q

Low melting/boiling point

A

Simple molecular

19
Q

Intermolecular

A

Breaking weak forces of attraction

20
Q

Intramolecular

A

Breaking strong forces of attraction

21
Q

Methane has a…

A

Low melting point

22
Q

Graphite has…

A

weak intermolecular bonds

23
Q

Diamond has…

A

strong intramolecular bonds

24
Q

Allotrope

A

different structural forms of the same element, in the same physical state

25
Q

Silicone dioxide

A

Sand

26
Q

Why can graphite conduct electricity?

A

Has delocalised electrons; charge can be carried

27
Q

Can diamond conduct electricity/heat?

A

No; no free electrons

28
Q

Can graphite conduct electricity/heat?

A

Yes; has free electrons

29
Q

Arrangement of Graphite

A

Arranged in layers; held by weak intermolecular bonds

Chemistry Edexcel (13 decks)

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