Chemistry form 4

Which one is atom

• Magnesium

• H20

• NaCl

What is atom

• the base constructive structure of a matter

• combination with two or more matter

• charged particles

What is the charge of ion sulphate(SO4)

• +1

• +2

• -1

• -2

What is cation charged

• -

• +

What is mole

• mole is atom of the same elments with the same nombor of proton and electron but different number of neutron

• Mole is a base unit of mesaure of quantity of a substance

• non of this above

Why there is a constant temperature when heating naphtalene

• Because the heat energy use to overcome the force of attraction between particle naphtalene

• Because the heat enery loss to surrounding is balenced by the heat energy that released when the bond form

Which one is the emperical fomular of magnesium oxide

• MgO

• Mg2O

• Mg3O2

• MgO3

Which one is the correct molar mass of oxygen

• 32

• 16

• 18

• 21

What does ion oxide charged

• 2-

• +

• -

• 2+