CAT and Recall revision - January 2023

Question 1

Name the three sub atomic particles

Answer 1

Proton, Neutron and electron

Question 2

What is the relative charge of a proton?

Answer 2

+1

Question 3

What is the relative charge of a neutron?

Answer 3

0

Question 4

What is the relative charge of a electron?

Answer 4

-1

Question 5

Why do atoms have no overall electrical charge (are neutral)?

Answer 5

The number of positive proton equals the number of negative electrons so charges cancel out.

Question 6

What does the atomic number tell you?

Answer 6

Number of protons

Question 7

What makes an atom of an element the element it is?

Answer 7

The protons

Question 8

What makes atoms of elements different to each other?

Answer 8

They have a different number of protons

Question 9

What is the relative mass of a proton?

Answer 9

1

Question 10

What is the relative mass of a neutron?

Answer 10

1

Question 11

What is the relative mass of a electron?

Answer 11

1/1840 (Almost 0)

Question 12

What is mass number?

Answer 12

The sum of the protons and neutrons in an atom

Question 13

What is an isotope?

Answer 13

The same element with the same number of protons but different numbers of neutrons

Question 14

Why is the relative atomic mass of chlorine not a whole number?

Answer 14

It has more than one isotope

Question 15

How do the chemical properties of an isotope differ?

Answer 15

Doesn’t/does have the same number of electrons

Question 16

How do you work out the number of protons

Answer 16

Use the atomic number

Question 17

How do you work out the number of electrons in an atom

Answer 17

Same as the protons

Question 18

How do you work out the number of neutrons

Answer 18

Mass number - atomic number

Question 19

What do the electrons occupy in an atom

Answer 19

The lowest available energy levels.

Question 20

How many electrons are there found in shells 1,2 and 3?

Answer 20

2,8,8

Question 21

What sub atomic particle is involved in bonding (chemical reactions)?

Answer 21

Electrons

Question 22

What holds atoms of elements together in compounds?

Answer 22

Chemical bonds

Question 23

How were early periodic tables arranged? (Newland and Mendeleev)

Answer 23

Atomic weight

Question 24

metal + oxygen=

Answer 24

metal oxide

Question 25

metal + water =

Answer 25

metal hydroxide + hydrogen

Question 26

What does the group number tell you?

Answer 26

The number of electrons in the outer shell.

Question 27

What does the period number tell you?

Answer 27

the amount of shells

Question 28

metal + chlorine =

Answer 28

metal chloride

Question 29

What is distillation?

Answer 29

separating soluble substances from a solution.

Question 30

What is fractional distillation?

Answer 30

separating a mixture of substances with different boiling points

Question 31

What is filtration?

Answer 31

separating an insoluble solid from a liquid

Question 32

What is chromatography?

Answer 32

separating coloured components from a mixture.

Question 33

What charge are alpha particles?

Answer 33

positive

Question 34

Before electrons were discovered, atoms were thought to be what?

Answer 34

tiny spheres

Question 35

What subatomic particle was discovered first?

Answer 35

electron

Question 36

What is a molecule?

Answer 36

a group of atoms

Question 37

Five ways to separate a mixture

Answer 37

simple distillation, filtration, chromatography, fractional distillation and crystallisation.

Question 38

Where is the electron found?

Answer 38

in the shell/energy levels

Question 39

What is group 0 called?

Answer 39

Noble gases

Question 40

What is group 7 called?

Answer 40

Halogens

Question 41

What is group 1 called?

Answer 41

Alkali metals

Question 42

As you go down group 1 the atoms become ______ as they have got more ______.

Answer 42

bigger,shells

Question 43

What do metals want

Answer 43

to loose an electron

Question 44

What do non-metals want

Answer 44

to gain an electron

Question 45

What did Mendeleev do in his periodic table? (3)

Answer 45

- left gaps for undiscovered elements - added more columns - predicted the new elements and where they would go

Question 46

What was the plum pudding model?

Answer 46

JJ Thompsons model that atoms are positive balls of charge with electrons embedded within.

Question 47

What was Democritus' theory of the atom?

Answer 47

That atoms are the smallest particles and cannot be divided any further.

Question 48

What was Ernest Rutherford's theory?

Answer 48

The electrons obits a large ball of concentrated mass (nucleus).

Question 49

What was Niels Bohr's theory?

Answer 49

The electron orbits in spherical orbits around the nucleus.

Question 50

What did James Chadwick discover in the nucleus?

Answer 50

Neutrons

Question 51

How did Newlands arrange is elements?

Answer 51

Atomic mass

Question 52

What is a displacement reaction?

Answer 52

When the more reactive element displaces the less reactive.