super honor

Which of the below salt is soluble with water?

• AgI

• PbCl₂

• BaSO₄

• Ca(OH)₂

The compound magnesium sulfate has the formula MgSO₄. What is the relative formula mass of magnesium sulfate?

• 86

• 134

• 120

• 172

Which one of the following would you use to separate sand from iron filings?

• a bar magnet

• filter paper

• hot plate

• condenser

The separation technique that involves heating a solution until the liquid changes into a gaseous state, leaving behind a solid is known as:

• chromatography

• distillation

• decanting

• evaporation

Which method is used to obtain a concentrated solution of ethanol from a dilute solution of ethanol dissolved in water?

• crystallisation

• distillation

• filtration

• paper chromatography

Zinc sulfate is made by reacting an excess of zinc oxide with dilute sulfuric acid. The excess zinc oxide is then removed from the solution. Which process is used to obtain solid zinc sulfate from the solution?

• crystallization

• dissolving

• filtration

• fractional distillation

Which two gases are obtained from liquid air by fractional distillation?

• carbon dioxide and oxygen

• carbon dioxide and water vapour

• nitrogen and oxygen

• nitrogen and water vapour

The equation for the reaction between magnesium and dilute sulfuric acid is shown. 

Mg +H₂SO₄→MgSO₄+H₂

Which mass of magnesium sulfate will be formed if 24 g of magnesium are reacted with sulfuric acid?

• 5g

• 10g

• 60 g

• 120 g

What is the concentration of a solution that contains 25.0 g NaOH in 50 cm³ of water?

• 12.5 mol/ dm³

• 0.800 mol/ dm³

• 1.25 mol/ dm³

• 3.20 mol/ dm³

A compound contains 34.5% calcium, 24.1% silicon and 41.4% oxygen by mass.

What is its empirical formula?

• Ca₂SiO₃

• CaSiO₃

• CaSi₂O₃

• CaSiO₆