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year 9 revision > Chemistry test 1 > Flashcards

Chemistry test 1 Flashcards

1
Q

What is hydrogen at room temperature?

A

Gas

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2
Q

Is chemical or physical bonding stronger?

A

Chemical

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3
Q

All … are made up of atoms

A

Substances

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4
Q

How many groups are there in the periodic table?

A

8

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5
Q

Elements contain only … type of atom

A

one

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6
Q

Compounds contain more than one type of …

A

atom

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7
Q

An atom has a … at its centre, surrounded by electrons (in the shells)

A

Nucleus

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8
Q

An atom has a nucleus containing …

A

Protons and Neutrons

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9
Q

Protons have a … charge

A

Positive

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10
Q

Neutrons have a … charge

A

Neutral

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11
Q

Electrons have a … charge

A

Negative

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12
Q

What is an isotope?

A

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.

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13
Q

… are atoms of the same element with the same number of protons but different numbers of neutrons.

A

Isotopes

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14
Q

What is the relative atomic mass of an element?

A

The average mass of the atoms of an element taking into account all of the isotopes of that element

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15
Q

What is the relative atomic mass of Bromine?

A

80

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16
Q

What is the relative atomic mass of Neon?

A

20

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17
Q

What is the relative atomic mass of Aluminium?

A

27

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18
Q

Where are transition metals positioned on the periodic table

A

Between groups 2 & 3

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19
Q

True or False: Transition metals are highly reactive

A

False

20
Q

True or false: Transition metals can form positive ions with different charges

A

True

21
Q

True or False: Transition metals form coloured compounds and are useful as catalysts

A

True

22
Q

True or False: Transition metals have similar properties to alkali metals

A

True

23
Q

Y/N: Are the transition metals harder and stronger than the alkali metals?

A

Yes

24
Q

Y/N: Is aluminum a transition metal?

A

No

25
Q

Noble gases are very u………

A

Unreactive

26
Q

Does the boiling point of Noble Gases (increase / decrease / stay the same) as you go down the periods in the periodic table?

A

Increase

27
Q

Why are the Noble Gases highly unreactive & why do they form molecules?

A

Their atoms have a full outer shell of electrons

28
Q

what are the physical properties of transition metals?

A

-Shiny
-Conduct heat & electricity
-Strong & hard
-Higher density than group 1
-Higher melting point than group 1 (except Hg (Mercury))

29
Q

what are the physical properties of alkali metals?

A

-Shiny when freshly cut
-Very soft
-Good thermal and electrical conductors
-Relatively low density
-Relatively low melting point

30
Q

Where are the alkali metals positioned on the periodic table?

A

Group 1

31
Q

What is the order of groups in the periodic table?

A

1,2,3,4,5,6,7,0

32
Q

How did John Dalton arrange the elements in his “Table of Elements”?

A

In order of atomic weight

33
Q

How many elements did John Dalton know about to include in his “Table of Elements”?

A

20 elements

34
Q

Name the 3 men who worked to develop a Periodic Table of Elements in the 19th Century

A

-John Dalton
-John Newlands
-Dimitri Mendelev

35
Q

What does a group refer to in the periodic table?

A

A column of elements going down the table

36
Q

What happens to reactivity as you go down group 1?

A

Reactivity increases

37
Q

How many electrons do group 7 elements gain and what ion do they form?

A

Gain 1 electron and form a 1-ion

38
Q

How did Mendelev arrange the elements in his table?

A

By atomic mass and similar properties

39
Q

Why did Mendelev leave gaps in his table?

A

He predicted elements that had not been discovered yet

40
Q

The average mass of the atoms of an element taking into account all of the isotopes of that element

A

Relative atomic mass

41
Q

Tomson’s plum pudding model (1897)

A

-Mass of positive charge
-Negative electrons

42
Q

Rutherford - Bohr model (1913)

A

-Positive nucleus containing protons
-Negative electrons in shells

43
Q

Chadwick model (1932)

A

-Positive nucleus containing neutrons and protons
-Negative electrons in shells

44
Q

How many electrons does the first shell hold

A

2

45
Q

How many electrons does the second shell hold

A

8

46
Q

How many electrons does the third shell hold

A

8

47
Q

Relative atomic mass of chlorine

A

**Ar=(35x75.8)+(37x24.2)=

**75.8+24.2

year 9 revision (11 decks)

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