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Sc 9 > Chemistry Year 9 > Flashcards

Chemistry Year 9 Flashcards

1
Q

What are the three types of atoms

A

Protons, neutrons, electrons

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2
Q

Where are the electrons found?

A

On the outer rings

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3
Q

Where are the protons and neutrons found

A

Together in the nucleus

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4
Q

What is the relative mass of protons and neutrons?

A

One

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5
Q

What is the relative mass of an electron?

A

Almost 0

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6
Q

What is the charge of a proton?

A

Plus one

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7
Q

What is the charge of a neutron?

A

Zero

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8
Q

What’s the charge of an electron?

A

Minus one

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9
Q

When calculating the missing values of elements, what columns are the same?

A

The atomic number number of protons and the number of electrons

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10
Q

How do you find the number of neutrons?

A

Mass number - Atomic number

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11
Q

What do protons and electrons have in common?

A

They both always have the same amount

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12
Q

Why are atoms always Neutral 

A

There’s always the same amount of protons and electrons, so they cancel each other out

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13
Q

How many electrons can you have on the first shell

A

2

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14
Q

How many electrons can you have on the second shell

A

Eight

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15
Q

How many electrons can you have on the third shell

A

8

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16
Q

How many electrons can you have on the fourth shell

A

The rest

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17
Q

Where do you find protons on an element?

A

On the bottom/the atomic number

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18
Q

What are isotopes?

A

They are different variants of a particular element in a chemical which differ in neutrons

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19
Q

How do you balance equations?

A

By placing a big number, for example 2

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20
Q

How do you workout formula mass?

A

You have to add the atomic mass of each element in the formula

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21
Q

 How many elements in monoxide

A

One

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22
Q

How many elements in dioxide?

A

2

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23
Q

How many elements in trioxide?

A

Three

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24
Q

How do you go from a gas to solid?

A

Deposition 

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25
Q

How do you go from solid to gas?

A

Sublimation

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26
Q

How do you go from gas to liquid?

A

Condensation

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27
Q

How do you go from liquid to gas?

A

Evaporation

28
Q

How do you go from Liquid to solid 

A

Freezing

29
Q

How do you go from solid to liquid?

A

Melting

30
Q

Where is the atomic number on an element?

A

On the bottom

31
Q

Where is the mass number on an element?

A

On the top

32
Q

How do you calculate the number of moles when you’re given the number of grams

A

Find out the formula mass and then put that on the bottom of the fraction and the amount of grams given on the top 

33
Q

How do you calculate the percentage of an element in a formula?

A

Finding the formula mass and putting it at the bottom of the fraction And then put the atomic mass of the element on the top

34
Q

How close are the particles of a solid?

A

Very close

35
Q

How close are the particles of liquids?

A

Quite close

36
Q

How close are the particles of gases?

A

Wide apart

37
Q

How are the particles of solids arranged?

A

Ordered

38
Q

How are the particles of liquids arranged?

A

Randomly

39
Q

How are the particles of gases arranged

A

Randomly

40
Q

How do the particles of solids move

A

They vibrate

41
Q

How do the particles of liquids move?

A

Move freely

42
Q

How do the particles of gases move?

A

Move fairly freely

43
Q

Name the four physical properties of a solid

A

Fixed volume, cannot be compressed, does not flow and has a high density

44
Q

What are the five physical properties of a liquid

A

Fixed volume, changes shape, Cannot be compressed, flows easily and high density

45
Q

Why can a solid not be compressed?

A

The space between the particles is too small, and there are lots of forces of attraction

46
Q

Why can a gas be compressed?

A

The particles are more spread out and can be pushed closer together when it squashed or under pressure

47
Q

Why do liquids flow?

A

The particles are not in a set position, so they can move past one another

48
Q

Why do ice creams turn to liquid on a hot day?

A

The particles vibrate, because of the heat and gets energy and so the bonds begin to weaken, so it starts to be able to flow and melts

49
Q

 What are the forces and energy levels in a solid?

A

The force is a strong and the energy is little

50
Q

What are the forces and energy levels in a liquid?

A

Weak and some energy

51
Q

What are the forces between gases and energy levels?

A

It has almost no forces, but there is lots of energy

52
Q

Why are solids so dense

A

The particles are so closely packed together, and there are strong forces of attraction

53
Q

Where is the mass number of an element always

A

On the top

54
Q

What is the mass number of sodium?

A

23

55
Q

How do you calculate the number of neutrons in an element?

A

Atomic mass take away the proton or electrons

56
Q

What are isotopes?

A

Elements with a different number of neutrons at the same number of protons

57
Q

What is the definition of a mixture?

A

Two or more elements together, not chemically, joined, and can be easily separated

58
Q

Why are noble gases so unreactive?

A

The outer shell is full of electrons

59
Q

Name, three halogens

A

Chlorine, fluorine, iodine, or astatine

60
Q

If 10 g of magnesium reacts with 5 g of oxygen, what is the mass of magnesium oxide produced?

A

15 g

61
Q

What does one mole equal 

A

6.02×10 to the power of 23

62
Q

How do you find the grams of a substance, if you only have the moles

A

X the molar mass

63
Q

Which three values of an element are always the same

A

Atomic number, number of protons and number of electrons

64
Q

Where is a group on the periodic table

A

The top, the one with the most colums

65
Q

Where are the periods on the period table

A

On the side, the one with the least amount of colums

66
Q

Good luck on exams

A

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67
Q

What is a mole

A

Avagardo’s number/the amount of molecules of a substance

Sc 9 (4 decks)

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