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YR8 Science > Chemistery > Flashcards

Chemistery Flashcards

1
Q

Element

A

A natural occurring substance and is made up of its own atoms.

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2
Q

Compound

A

Are two or more elements chemically combined together.

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3
Q

Mixture

A

two or more elements not chemically combined together.

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4
Q

what were Levoister’s discoveries

A

some elements and he planned the periodic table.

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5
Q

When did Levoister’s discoveries come out?

A

1789

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6
Q

When were triads discovered?

A

1817

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7
Q

When were Newland’s 8 similarities came out?

A

1857

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8
Q

When was Meendelev’ s first periodic table come out?

A

1887

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9
Q

When isotopes and atomic number found?

A

1913

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10
Q

The first scientist to arrange elements in order of atomic weight?

A

Meendelev

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11
Q

Molecule

A

are made up of two or more atoms. It can be formed by two atoms of the same element or by atoms from different elements.

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12
Q

What is the full form of AR and what does it mean?

A

Relative atomic mass tells you the number of protons and neutrons.

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13
Q

Atomic mass

A

tells you the number of protons and electrons

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14
Q

isotopes

A

an atom of the same element but different number of neutrons

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15
Q

what are the changes and not and why if you are an isotope

A

chemically reactions are the same because the numbers of electrons and protons are the same. Physical properties are affected like melting point and density because of the changes of neutrons.

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16
Q

How many electrons are needed in the outer shell to be more stable?

A

8

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17
Q

which noble gases can hardly make compounds?

A

Krypton(Kr) and Xenon(Xe)

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18
Q

which noble gases are lighter than air?

A

Helium, Neon

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19
Q

which noble gases are heavier than air?

A

Argon and Krypton

20
Q

Are noble gases in colors

A

No, they are transparent

21
Q

What is xenon used for?

A

in car lights

22
Q

What happens when an electric current goes through neon?

A

It glows orange

23
Q

Which noble gas is highly radioactive?

A

Radon(Rn)

24
Q

What are other names for noble gases?

A

Group0, Group18

25
Q

What happens is you go down the noble gases(5)

A 
Increases: 
the atomic number
number of shells
Size of the atom
Density
boiling point
26
Q

sublimation

A

changing from a solid to gas directly

27
Q

What happens to Iodine when it is heated gently?

A

Sublimation happens

28
Q

Does the melting point and the size decrease or increase as you go down group 7

A

decrease

29
Q

what happens when two elements of group 7 react together?

A

Covalent bond forms

30
Q

what state are fluorine and chlorine at room temperature?

A

gas

31
Q

what state are Iodine at room temperature?

A

solid

32
Q

Does the RAM increase or decrease as you go down group 7?

A

increase

33
Q

what happens when halogens accept one electron in the outer shell

A

It becomes stable

34
Q

Which halogen has a reddish-brown color?

A

Bromine

35
Q

Which halogen has the highest melting point

A

Fluorine

36
Q

Which halogen is the only liquid halogen

A

Bromine

37
Q

Which halogen has the lowest melting point

A

Astatine

38
Q

Which halogen is a pale yellow/green gas?

A

Chlorine

39
Q

Which halogen is a solid

A

iodine, Astatine

40
Q

Which halogen is a pale green gas

A

Fluorine

41
Q

Which halogen is purple in color

A

Iodine

42
Q

What happens when halogens react with metals

A

Ionic bonding

43
Q

Ionic bonding

A

Really strong bonding between a non-metal and metal where the metal gives electron/s to the metal. It is really strong because it is formed from positive and negative ions.

44
Q

Covalent bonding

A

Where two or more elements share one electron to be more stable, this way they both can gain an electron.

45
Q

Describe the attraction(inter molecular) between simple molecular substances

A

they are really weak so melting points and boiling points are low. Because the inter molecular forces are really weak the covalent bond is not broken. At room temperature, most are liquids or gases.

46
Q

What are the qualities of transition metals?

A

Lustrous(bright and shiny)
hard and strong
high density
malleable(can be bent &pressed into different shapes)
ductile(can be drawn into wires)
good conductors of heat and electricity
high melting and boiling point except for mercury which is liquid at room temperature

47
Q

What are the qualities of transition metals compared to group 1

A

are denser

higher melting and boiling point except for mercury

YR8 Science (7 decks)

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