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Year 8 study decks > Elements, compounds and mixtures > Flashcards

Elements, compounds and mixtures Flashcards

1
Q

What are all substances made out of?

A

Atoms

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2
Q

What is the smallest part of an element?

A

An atom

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3
Q

How are atoms of each element represented?

A

There are represented by a chemical symbol, eg oxygen is represented by O and sodium is represented by Na

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4
Q

What are elements shown in

A

A periodic table

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5
Q

Where are metals found in the periodic table

A

Metals are found to thr left and towards the bottom of the periodic table

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6
Q

Where are non metals found in the periodic table

A

Towards the right and top of the periodic table

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7
Q

What are the properties of metal?

A

They conduct heat and electricity they are hard and strong plus have Hugh melting point.

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8
Q

How are elements in the periodic table arranged?

A

They are arranged so that elements with similar properties are in columns known was groups

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9
Q

What are the elements in group 1?

A

Alkali metals they are very reactive

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10
Q

What are the properties of alkali metals?

A

They are soft have a low melting point and are a low density

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11
Q

What is a compound?

A

Compounds contain 2 or more elements chemically combined in fixed proportions

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12
Q

How can compounds be represented?

A

They can be represented by formulae using the symbols of the atoms which they were formed

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13
Q

What do compounds ending in ide contain?

A

2 or more elements

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14
Q

How can compounds be separated into elements?

A

By chemical reactions

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15
Q

What do compounds ending in ate contain?

A

2 or more elements plus oxygen

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16
Q

What is a molecule?

A

A small group of atoms chemically bonded together is known as a molecule

17
Q

What is a mixture

A

A mixture consists of two or more elements or compounds that are not chemically combined together

18
Q

How can a mixture be separated

A

A mixture can be separated by phi cal methods and does not have a fixed composition

19
Q

What is group seven in the periodic table known as?

A

Halogens

20
Q

What are the properties of halogens?

A

They are non metal and consists of molecules made by pairs of atoms they have low melting point and boiling points they are also poisonous and smelly

21
Q

An example of halogens?

A

Chlorine it is used in swimming pools to kill bacteria

22
Q

What are the properties of transition metals?

A

Harder stronger, higher density and less reactive then group 1 they have many uses

23
Q

What is the elements in group 0 called?

A

Noble gases they are unreactive

24
Q

What is an atom?

A

Smallest part of an element

25
Q

What is an element?

A

Made up of only one type of atom

Year 8 study decks (7 decks)

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