Chemistry CE revision

the most abundant gas in the atmosphere

• carbon dioxide

• nitrogen

• oxygen

• hydrogen

the dye which travels furthest up the chromatogram

• least concentrated

• most concentrated

• least soluble

• most soluble

the number of atoms in one molecule of nitric acid HNO₃

• 3

• 4

• 5

• 6

a reaction would not occur in..

• iron sulphate + zinc

• magnesium + iron chloride

• zinc + magnesium sulphate

• zinc oxide + magnesium

an element has a melting point of -55 ⁰c and boiling point of 80 ⁰c. what state is it at room temperature?

• solid

• liquid

• gas

24g of magnesium burns to produce 40 g of Magnesium Oxide. To make 120g of Magnesium oxide, the mass of magnesium needed would be

• 24

• 60

• 64

• 72

correct definition for an element

• contains only one type of atom

• two or more atoms chemically joined

• two or more different atoms chemically joined

• two or more different substances not chemically joined

Which of the below are compounds

• H₂O

• HCl

• Na

• Mg

Which of the below are mixtures

• Air

• HCl

• Smarties

• Sand and water

A chemical reaction is