mock

Question 1

describe the plum pudding model

Answer 1

a sphere of positive charge with electrons embedded into it

Question 2

Put electrons, neutrons and protons in order of when they were discovered

Answer 2

first- electrons
second- protons
third- neutrons

Question 3

How many outer shell electrons does the element tenessine have and why?

Answer 3

7 because it is in group 7

Question 4

Explain the making salts required practical 1

Answer 4

1. add a fixed amount of hydrochloric acid into a beaker and add zinc carbonate while stiring
2. keep adding zinc carbonate until it doesnt dissolve in the solution anymore(this means it is in excess)
3. filter out the excess zinc carbonate using filter paper
4. gently heat up the solution over a bunsen burner until it starts to crystalise
5. remove from the bunsen burner and leave to crystalise

Question 5

What is meant by the term ‘weak acid’?

Answer 5

has only been partially ionised in an aqueous solution

Question 6

What colour change happens to litmus paper in acid

Answer 6

blue- red

Question 7

why are metals good conductors?

Answer 7

Electrons carry charges and since metals have delocalised electrons, they move through the metal and carry a charge

Question 8

why are pure metals better conductors than alloys

Answer 8

in alloys, the atoms are different sizes which disrupts the structure and limits the movement of electrons

Question 9

Is sodium more or less reactive than aluminium?

Answer 9

more reactive

Question 10

How would you convert cm to dm

Answer 10

divide by 1000

Question 11

Concentration=

Answer 11

moles/volume

Question 12

Why is argon in group 0?

Answer 12

they have a full outer shell which makes them stable so they dont need to transfer electrons

Question 13

100kg=

Answer 13

100 000 g

Question 14

volume of gas=

Answer 14

mol x 24