Past Paper Foundation 1

Question 1

pH of Acid

Answer 1

less than 7

Question 2

which ion in an aqueous solution causes acidity

Answer 2

H+

Question 3

What type of reaction is this :

H2SO4 + 2NaOH —> Na2SO4 + 2H2O

Answer 3

Neutralisation

Question 4

What salt is produced in this reaction:

H2SO4 + 2NaOH —> Na2SO4 + 2H2O

Answer 4

Sodium Sulfate

Question 5

How can indicator be used to show when sodium hydroxide has reacted with sulfuric acid

Answer 5

-Add indicator to sodium hydroxide solution

-Add sulfuric acid gradually

-Until indicator changes colour

Question 6

Here are the symbols in group 5 of John Newland’s table:

C + Si

What are their names?

Answer 6

Carbon and Silicon

Question 7

In what order is the modern periodic table aranged?

Answer 7

Atomic Number

Question 8

Here are the element symbols in group 1 of Newland’s table, who arranged based on atomic weight:

H + F + Cl

What are the differences between this and group 1 of the modern periodic table?

Answer 8

-Hydrogen + Fluorine + Chlorine are not in group one of modern periodic table

-Lithium + sodium + potassium are in group one of the periodic table

Question 9

What are the differences and similarites between plum pudding model and nuclear model?

Answer 9

-plum pudding model has a single
ball of positive charge and nuclear
model has positive charges in the
centre / nucleus

-plum pudding model has electrons
in random positions and nuclear
model has electrons in fixed
positions

-plum pudding model has no
nucleus and the nuclear model
has a nucleus

-plum pudding model has no
neutrons and the nuclear model
has neutrons in the nucleus

Question 10

What products are formed at each electrode if electroysis-ing potassium bromide?

Answer 10

cathode = hydrogen

anode = bromine

Question 11

Why is copper formed at cathode during electrolysis of salts?

Answer 11

Copper is positive, so is attracted to negative cathode

Question 12

What type of compound is calcium oxide

Answer 12

Base

Question 13

What type of structure does Calcium Oxide have?

Answer 13

A giant ionic lattice in which there are strong forces of electrostatic attraction in all directions

Question 14

How does oxygen (2, 6) and calcium (2, 8, 8, 2) form calcium oxide?

Answer 14

-calcium loses electrons and

-oxygen gains electrons

-two electrons are transferred

-calcium has a 2+ charge

-oxide has a 2– charge

Question 15

Sodium chloride is dissolved in water to separate it from titanium,

why is this done in an atmosphere of dry argon instead of air containing water vapour?

Answer 15

-Argon is unreactive
-water vapour would react with sodium
-air contains oxygen that would react with reactants

Question 16

Why do metals conduct electricity?

Answer 16

-electrons in the outer shells of metal atoms are delocalised

-so the electrons are free to move through the whole STRUCTURE