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science Year 9 > Chemisty > Flashcards

Chemisty Flashcards

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1
Q

Solid>liquid

A

Melting

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2
Q

Liquid>gas

A

Boiling/evaporation

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3
Q

Gas>liquid

A

Condensation

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4
Q

Liquid>solid

A

Freezing

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5
Q

Solid>gas

A

Sublimation

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6
Q

Gas>solid

A

Deposition

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7
Q

Differences between boiling and evaporation

A

Evaporation can happen below boiling point boiling can’t
Evaporation only happens at the surface boiling happens throughout the liquid
Boiling has bubbles and evaporation doesn’t

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8
Q

The 3 states of matter are…

A

Solid, liquid, gas

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9
Q

They longer you leave a substance to cool the _______ the temperature will get

A

Lower

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10
Q

Why don’t all substances change state at the same temperature

A

They all have different melting, boiling, freezing and condensation points

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11
Q

What is an atom made up of?

A

Electrons, neutrons and protons

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12
Q

Protons are…

A

Posotive

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13
Q

Neutrons have…

A

No charge

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14
Q

Electrons are…

A

Negative

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15
Q

How is a element in the periodic table laid out?

A

Relative atomic mass
Atomic symbol
Name
Atomic (proton) number

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16
Q

Why do atoms have no charge?

A

Because they have one positive and one negative they cancel each other out to make it neutral.

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17
Q

The number of protons and electrons is the…

A

Atomic number

18
Q

The number of neutrons is the mass number - the atomic number

A

👍

19
Q

The mass number is…

A

The atomic number + the number of nuetrons

20
Q

Atoms have shells around the outside for the…

A

Electrons

21
Q

The first shell can have __ electrons

A

2

22
Q

The second shell can have __ electons

A

8

23
Q

The third shell can have __ electrons

A

8

24
Q

The fourth shell can have ______________ electrons

A

The rest of the

25
Q

The number is electrons in each shell is called the electron structure

A

👍

26
Q

When 2 elements chemically combine to make a compound, the name of the 2nd element changes to …

A

Ide. E.g oxygen = oxide

27
Q

Magnesium sulphur = magnesium sulphide

A

👍

28
Q

Water - H2O

What is its formula mass

A

(2xH)(1xO)

(2x1)(1x16) = 18

29
Q

When we work out the formula mass for a compound, we must…

A

Add together the atomic masses of all the elements in the formula

30
Q

If the compound is NH3 there will be __ elements and __ atoms

A

2 elements and 4 atoms

31
Q

A mole is

A

6.022 x 10^23

32
Q

Solid particles are

A

Very close

33
Q

Liquid particles are

A

Quite cles

34
Q

Gas particles are

A

Wide apart

35
Q

Solid particles are arranged

A

In rows

36
Q

Gas particles are arranged

A

Randomly

37
Q

Liquid particles are arranged

A

To fit the container

38
Q

The solid particles move

A

Vibrate only

39
Q

Liquid particles move

A

Fairly freely

40
Q

Gas particles move

A

Freely

science Year 9 (2 decks)

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