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Chemistry year 8 > Topic 1 - (periodic table and elements and compounds) > Flashcards

Topic 1 - (periodic table and elements and compounds) Flashcards

1
Q

What are the 2 types of molecules?

A

Elements and compounds

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2
Q

What is an element?

A

More than 2 of the same atom or molecule

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3
Q

What is a compound?

A

More than 2 different elements chemically combined

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4
Q

Are compounds pure substances or mixtures?

A

Pure substances

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5
Q

What is a mixture?

A

2 or more different substances not chemically combined

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6
Q

Miscible

A

Can mix

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7
Q

Imiscible

A

Cannot mix

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8
Q

Why does distillation work?

A

because the substances have different boiling points, so the substances with the lowest boiling points will evaporate first

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9
Q

What is group 1 on the period table?

A

Alkali metals

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10
Q

What is group 7 on the periodic table?

A

Halogens

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11
Q

What is group 0/8 on the periodic table?

A

Noble gases

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12
Q

As you go down group 1 (alkali metals) …

A
  • They get MORE reactive
  • the atomic number increases
  • the melting and boiling point DECREASES
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13
Q

As you go down group 7 (halogens)..

A
  • they get LESS reactive
  • the atomic number increases
  • the melting and boiling point INCREASES
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14
Q

The Noble gases Group 0/8 …

A
  • colourless

- unreactive

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15
Q

Why are the noble gases unreactive?

A

Because they have a full outer shell of 8 electrons

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16
Q

What are most of the elements on the periodic table?

A

METALS

17
Q

What side are metals and non-metals on the periodic table?

A

Metals on the LEFT

Non-metals on the RIGHT

18
Q

Some properties of metals are….

A
  • conduct heat and electricity
  • sonorous
  • malleable
  • ductile
19
Q

Some properties of non-metals are….

A
  • do NOT conduct heat or electricity
  • are NOT malleable
  • are NOT ductile
  • are NOT sonorous
20
Q

Do metals or non-metals have higher densities?

A

METALS

21
Q

What is the difference between a compound and a mixture?

A

A compound has 2 or more different elements chemically combined

WHEREAS

A mixture has 2 or more different substances (elements or compounds) NOT chemically combined

22
Q

What are some properties of group 1 alkali metals?

A
  • can be easily cut with a knife
  • low densities
  • some float on water
22
Q

What are the halogens?

A

Non - metals

23
Q

What is a molecule?

A

2 or more atoms chemically combined

Chemistry year 8 (3 decks)

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