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.Science Yr9 > Chemistry > Flashcards

Chemistry Flashcards

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1
Q

How close do solids particles stay together

A

Very close

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2
Q

How close do liquids stay together

A

Quite close

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3
Q

How close do gases stay together

A

Wide apart all on their own

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4
Q

How is tye solid partical arranged

A

They are ordered

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5
Q

How are liquids arranged

A

They are random

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6
Q

How are gases arranged

A

They are random

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7
Q

How does the solid particals move

A

They vibrate only

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8
Q

Hod does liquids move

A

They move freely

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9
Q

How do gases move

A

They move fairly freely

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10
Q

Why do gases and liquids take the shape of their container

A

Their particals move more freely due to being less compact

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11
Q

Why cant solids move around freely

A

They are more compact meaning they can’t move around as freely

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12
Q

Why can gases be squsihed together

A

As there are big spaces between tge particles which can be pushed together

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13
Q

Why can’t solids and liquids be squished together

A

The particles are so close together so they cant be pushed together

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14
Q

What are electrons

A

Electrons are blue small balls that rotate around the nucleaus that give off negative energy

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15
Q

What are protons

A

Protons are red balls inside the neucleas that give off postive energy

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16
Q

What is the newton

A

A green ball in the neucleaus that give off no charge

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17
Q

What makes up the mass number

A

Number of protons + number of neutrons

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18
Q

How do you find the atomic number

A

Number of protons + electrons

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19
Q

What is the biggest amount of electrons in a atom (circle one)

A

2

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20
Q

What is the biggest amount of atoms in (circle two)

A

8

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21
Q

What is the biggest amount of atoms in (circle 3)

A

8

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22
Q

What is the biggest amount of circles in (circle 4)

A

2

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23
Q

What is an element

A

Where all atoms are the same

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24
Q

What is a compound

A

Where two or more atoms are joined together with a certain sequence (chemicaly bonded)

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25
Q

What is a mixture

A

Where there is a mix of different elements

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26
Q

What is the region where electrons are found orbiting

A

Shell/energy

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27
Q

What two types of particles are found in the nucleus

A

Neutrons and protons

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28
Q

What is the name of the particle that has a 1 and another +1 in relative mass and charge

A

Proton

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29
Q

What is the name of the particle that has a relative mass of 1 and 0

A

Neutron

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30
Q

What do particles in a gas have that liquids and solids don’t

A

They have more energy in each particle

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31
Q

Why do particels in a gas move quicker than in any another state

A

They move quicker because they have a higher level of kinetic energy.

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32
Q

What is the term ment when something is a pure substance

A

It only contains one substance dg (Gold or water or oxygen)

33
Q

What is ment by the term the sharp boling point

A

It has a precious point at which melts or boils

34
Q

What is the relative mass and charge of a proton

A

1 Relative Mass and +1 charge

35
Q

What is relative mass and charge of a neutron

A

A relative mass of 1 and charge of 0

36
Q

What is the relative mass of a electron and charge

A

Very small relative mass and a charge of 1

37
Q

What does Mon mean (number of)

A

1 of something

38
Q

What does CO mean

A

1 Carbon + 1 Oxygen which is Carbon Monoxide

39
Q

What does di mean in (number of something)

A

Two of something

40
Q

What it CO2

A

1 Carbon + 2 Oxygens = Carbon Dioxide

41
Q

What is a period row

A

The horzontial (left to right)

42
Q

What is a group row

A

The vertical(up and down)

43
Q

Explain what eveapration is

A

When a liquid turns into a gas

44
Q

What is condensation

A

When water vapour (gas) turns into water

45
Q

What is melting

A

It is when ice (solid) is heated and changes into water (liquid)

46
Q

What is freezing

A

If water (liquid) is cooled, it changes to ice (solid

47
Q

Name the four physical properties of a solid

A

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

48
Q

Name the five physical properties of a liquid

A

Fixed volume,changes shape,cannot be compressed,flows eaily and high density

49
Q

Name the three correct physical properties of a gas

A

Changes shape,flows easily,low density

50
Q

Why cant a solid be compressed

A

A solid can’t be compressed because the space between each partical is too small

51
Q

Why can a gas be compressed

A

In a gas the particals are more spread out and can be pushed closer when squashed under pressure

52
Q

Why can a liquid flow

A

Liquids can flow due to not having a fixed shape or position.This means they can move past each other.

53
Q

Why can’t solids not flow

A

The particles in a solid are fixed,each partical can’t move past one another

54
Q

Why do lollies turn into liquids on a hot day

A

The tempratue increase causes the particles of the lolly gain energy from it’s surrounding which become displaced and cause it to vibrate rapidly then break and particles can then move.

55
Q

What is the radius of an atom

A

0.1

56
Q

Where is most of the mass in a atom

A

It’s in the centre

57
Q

Which of the following are compounds oxygen,salt water,magnesium oxide,sodium chloride,nitrogen

A

Magnesium oxide and sodium chloride

58
Q

What is the meaning of a compound

A

2 or more elements chemically joined

59
Q

What is the chemical symbol for Oxygen

A

O

60
Q

What is the chemical symbol for Lithium

A

Li

61
Q

What is the chemical symbol for sodium

A

Na

62
Q

What is the chemical symbol for potassium

A

K

63
Q

What is the chemical symbol for Helium

A

He

64
Q

what is the chemical symbol for carbon

A

C

65
Q

what is the chemical symbol for magnesium

A

Mg

66
Q

What is the definition of a mixture

A

Two or more elements together that are not chemically joined and be easily separated

67
Q

What is NaCl

A

Sodium chloride,sodium and chlorine

68
Q

What is MgO

A

Magnesium oxide, magnesium and oxygen

69
Q

What is MgS

A

Magnessium sulfide,magnessium and sulfur

70
Q

What is FeS

A

Iron sufide, iron and sulfur

71
Q

Name a few gases

A

Argon,neon,xenon,radon

72
Q

Why are the noble gases so unreactive

A

Their outer shell is full of electrons

73
Q

What happens to the reactivness of an alkali the lower down the table you go

A

It increases

74
Q

Why do the numbers of electrons increase the further you go from an electron

A

They are futher from the nucleaus which means there is less pull on the outer electrons so the atom is mire likely to loose an electron

75
Q

Sodium + water= sodium hydroxide + hydrogen

A

2Na+ 2H2(small)O=2NaOH+H2(small)

76
Q

List 4 Halogens

A

Chlorine,fluorine,iodine,astantie

77
Q

How many electrons are in the outer shell

A

7 electrons

78
Q

Describe how reactivity changes as you go down the group

A

They become less reactive,the atom become larger because there are more electron shell that are futher from the nucleus so the pul of the neucleus is less.So the electron is likely to be gained as there is less of a positive pull

.Science Yr9 (6 decks)

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