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.Science Yr9 > Chemistry > Flashcards

Chemistry Flashcards

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 the 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

A pure substance of one tipe of atom

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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
What is a mixture
Where there is a mix of different elements
26
What is the region where electrons are found orbiting
Shell/energy
27
What two types of particles are found in the nucleus
Neutrons and protons
28
What is the name of the particle that has a 1 and another +1 in relative mass and charge
Proton
29
What is the name of the particle that has a relative mass of 1 and 0
Neutron
30
What do particles in a gas have that liquids and solids don't
They have more energy in each particle
31
Why do particels in a gas move quicker than in any another state
They move quicker because they have a higher level of kinetic energy.
32
What is the term ment when something is a pure substance
It only contains one substance dg (Gold or water or oxygen)
33
What is ment by the term the sharp boling point
It has a precious point at which melts or boils
34
What is the relative mass and charge of a proton
1 Relative Mass and +1 charge
35
What is relative mass and charge of a neutron
A relative mass of 1 and charge of 0
36
What is the relative mass of a electron and charge
Very small relative mass and a charge of 1
37
What does Mon mean (number of)
1 of something
38
What does CO mean
1 Carbon + 1 Oxygen which is Carbon Monoxide
39
What does di mean in (number of something)
Two of something
40
What it CO2
1 Carbon + 2 Oxygens = Carbon Dioxide
41
What is a period row
The horzontial (left to right)
42
What is a group row
The vertical(up and down)
43
Explain what eveapration is
When a liquid turns into a gas
44
What is condensation
When water vapour (gas) turns into water
45
What is melting
It is when ice (solid) is heated and changes into water (liquid)
46
What is freezing
If water (liquid) is cooled, it changes to ice (solid
47
Name the four physical properties of a solid
Fixed volume,cannot be compressed,does not flow and high density
48
Name the five physical properties of a liquid
Fixed volume,changes shape,cannot be compressed,flows eaily and high density
49
Name the three correct physical properties of a gas
Changes shape,flows easily,low density
50
Why cant a solid be compressed
A solid can't be compressed because the space between each partical is too small
51
Why can a gas be compressed
In a gas the particals are more spread out and can be pushed closer when squashed under pressure
52
Why can a liquid flow
Liquids can flow due to not having a fixed shape or position.This means they can move past each other.
53
Why can't solids not flow
The particles in a solid are fixed,each partical can't move past one another
54
Why do lollies turn into liquids on a hot day
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
What is the radius of an atom
0.1
56
Where is most of the mass in a atom
It's in the centre
57
Which of the following are compounds oxygen,salt water,magnesium oxide,sodium chloride,nitrogen
Magnesium oxide and sodium chloride
58
What is the meaning of a compound
2 or more elements chemically joined
59
What is the chemical symbol for Oxygen
O
60
What is the chemical symbol for Lithium
Li
61
What is the chemical symbol for sodium
Na
62
What is the chemical symbol for potassium
K
63
What is the chemical symbol for Helium
He
64
what is the chemical symbol for carbon
C
65
what is the chemical symbol for magnesium
Mg
66
What is the definition of a mixture
Two or more elements together that are not chemically joined and be easily separated
67
What is NaCl
Sodium chloride,sodium and chlorine
68
What is MgO
Magnesium oxide, magnesium and oxygen
69
What is MgS
Magnessium sulfide,magnessium and sulfur
70
What is FeS
Iron sufide, iron and sulfur
71
Name a few gases
Argon,neon,xenon,radon
72
Why are the noble gases so unreactive
Their outer shell is full of electrons
73
What happens to the reactivness of an alkali the lower down the table you go
It increases
74
Why do the numbers of electrons increase the further you go from an electron
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
Sodium + water= sodium hydroxide + hydrogen
2Na+ 2H2(small)O=2NaOH+H2(small)
76
List 4 Halogens
Chlorine,fluorine,iodine,astantie
77
How many electrons are in the outer shell
7 electrons
78
Describe how reactivity changes as you go down the group
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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