Mock Revision

Question 1

How to work out the empirical formula

Answer 1

Start with the number of grams of each element, given in the problem.
Convert the mass of each element to moles using the molar mass from the periodic table.
Divide each mole value by the smallest number of moles calculated.
Round to the nearest whole number. This is the mole ratio of the elements and is.

Question 2

Test for carbon dioxide

Answer 2

The limewater goes cloudy

Question 3

Copper oxide

Answer 3

CuO

Question 4

Chlorine

Answer 4

Cl

Question 5

What is the mass number of an element

Answer 5

The total number of protons and neutrons

Question 6

What is the atomic number of an element

Answer 6

The number of protons found in the nucleus

Question 7

What is ionic bonding

Answer 7

Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds. It is one of the main bonds along with Covalent bond and Metallic bonding.

Question 8

What is the equilibrium

Answer 8

a state in which opposing forces or influences are balanced.

Question 9

Why do we use it

Answer 9

In equilibrium,not all the reactants are converted into products.The forced acting on the system remains constant in equilibrium. This helps us to understand the nature of the reaction.

Question 10

Describe an atom

Answer 10

Nucleus,protons,electrons,neutrons and the atom itself

Question 11

Test for oxygen

Answer 11

Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen.