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N5 Chemistry Revision > Unit 1 > Flashcards

Unit 1 Flashcards

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1
Q

An exothermique reaction…… energy.

A

Releases energy to its surroundings.

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2
Q

An endothermic reaction….. energy

A

It takes in energy from its surroundings.

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3
Q

What speeds up chemical reactions??

A

Increasing the concentration
Increasing the temperature
Decreasing the particle size

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4
Q

Why is it better if the particles are smaller rather in big chunks?

A

It mans there is a bigger surface area hence more space for SUCCESSFUL COLLISIONS to take place

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5
Q

How do you calculate rate?

A

change in quantity
Rate =—————————
Change in time

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6
Q

What is group one called?

Are they reactive?

A

Alkali metals

They are very reactive

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7
Q

What is group 2 called?

Are they reactive?

A

The alkaline earth metals

They are reactive

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8
Q

The name of group 7 is?

Are they reactive?

A

Halogens

They are reactive

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9
Q

What is group 0 called?

Are they reactive?

A

Noble gases

No, they are stable

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10
Q

What happens as you go down a group?

A

They become more reactive

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11
Q

What mass and charge does a proton have?

A

Mass=1amu

Charge=+1

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12
Q

What mass and charge does a neutron have?

A

Mass=1amu

Charge=0

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13
Q

What mass and charge does an electron have?

A

Mass=0amu

Charge=-1

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14
Q

4
He
2

The number of protons is?

A

2

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15
Q

4
He
2

The number of neutrons is?

A

4-2=2

The mass - the number of protons

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16
Q

4
He
2

The number of electrons is?

A

2

17
Q

When an atom gains or loses an electron it is then known as a……

A

Ion

18
Q

What is an isotope?

A

An isotope is atoms of an element they have everything the same except the number of neutrons which also means the mass is different.

19
Q

What is ionic bonding?

A

Ionic bonding is between metals and non metals.

They transfer electrons to become stable.

20
Q

What is covalent bonding?

A

Covalent bonding is between non metals.

They share their electrons to become stable.

21
Q

How many diatomic elements are there?

Name some of them.

A

7

Hydrogen 
Nitrogen 
Oxygen 
Fluorine 
Chlorine 
Bromine 
Iodine
22
Q

How are metals able to conduct?

A

Their outer electrons are delocalised

23
Q

When do ionic compounds conduct.

When do they not conduct.

Why is this?

A

When molten

As a solid

Ions are not free to move as a solid but they can move when it becomes a liquid.

24
Q

What is another name for an ionic compound?

A

Ionic lattice

25
Q

What type of melting and boiling point does it have?

A

Melting - high

Boiling - high

26
Q

What type of melting and boiling points does a covalent network have?

A

Melting - high

Boiling - high

27
Q

What type of melting and boiling points does a discrete covalent network have?

What type of bonding is present?

A

Melting - low

Boiling - low

Weak inter molecular bonds

28
Q

Elements conduct electricity by a flow of …..

Compounds conduct by a flow of …..

A

Electrons

Ions

29
Q

What is the gfm of CO2

A

CO2
|__|______1x12= 12
| (Add together)
|______2x16= 32

             gfm= 44
30
Q

Water contains an equal amount of?

A

H+ and OH- ions

31
Q

What can you use to tell if the substance is an acid or a base?

A

Universal indicator

pH paper

32
Q

……… dissolved in water to produce an acid.

A

Non metal oxides

33
Q

……… dissolves in water to produce a bases.

A

Metal oxides

34
Q

Metal oxides + acid ——> ? + ?

A

Salt + water

35
Q

How can you calculate the mass of something?

A

Mass = moles x gfm

36
Q

How can you calculate the number of moles?

A

Moles = mass / gfm

Moles = concentration x volume

37
Q

What type of reaction happens when 2 solutes react to form an insoluble product?

A

Precipitation

38
Q

What are spectator ions?

A

They do not take part in the reaction (they do not change in any way)

N5 Chemistry Revision (3 decks)

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