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

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

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

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

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?

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

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?

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

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

What is its empirical formula?

When the following redox reaction is balanced with the lowest possible integer coefficients, what is the sum of the coefficients of all reactants and products?

Cr₂O₇^2-+H⁺ +Fe²⁺→Fe³⁺+Cr³⁺+H₂O

A student used chromatography to analyze a green food colouring.

The chromatogram obtained is shown in Figure 1.

The table lists some yellow food dyes and their R_f values.  

Which yellow food dye does the green food colouring contain?

15 mL of 0.25 mol L^-1 aqueous silver nitrate reacts with 0.10 g of zinc as follows: 

2 AgNO₃ (aq) +Zn (s) →2 Ag (s) +Zn(NO₃)₂ (aq)

What mass of silver metal should the reaction produce?

What is the empirical formula of an oxide of iron, formed by reacting 2.24 g of iron with 0.96 g of oxygen?

An aqueous cation reacts with aqueous sodium hydroxide to form a white precipitate. The precipitate is insoluble in excess sodium hydroxide. What is the aqueous cation?

Salts can be made by adding different substances to dilute hydrochloric acid. For which substance could any excess NOT be removed by filtration?

What mass of cobalt(II) chloride hexahydrate(CoCl₂·6H₂O) must be used in order to make 500.0mL of a solution that has a chloride ion concentration of [Cl]=0.300 mol L^-1?

Copper(II) carbonate is broken down by heating to form copper(II) oxide and carbon dioxide gas.

CuCO₃ → CuO + CO₂

31.0g of copper(II) carbonate are heated until all of the contents of the test-tube have turned from green to black. The yield of copper(II) oxide formed is 17.5g. What is the percentage yield?

Which sequence is used to separate a soluble salt from a mixture of a soluble and an insoluble salt?

Which gas sample has the greatest mass?

A solution is 0.0240 mol L^-1 KI and 0.0146 mol L^-1 MgI₂. What volume of water should be added to 100.0 mL of this solution to produce a solution with [I^-] concentration of 0.0500 mol L^-1?

An unknown amino acid contains 9.5 % nitrogen by mass as determined by elemental analysis. Which of the following could be the unknown amino acid

Equal masses of a solid, X, are added in turn to an aqueous solution, Y.

The pH of the solution is measured after each addition until the pH becomes 7. The readings are plotted as shown in Figure 2. What are X and Y?

Which property is not characteristic of a base?

Which statement is not correct?

Which reaction is not characteristic of an acid?

The positions in the Periodic Table of four elements are shown.

Which element is most likely to form an acidic oxide?

Which statements about alkalis are correct?

1. When reacted with an acid, the pH of the alkali decreases.

2. When tested with litmus, the litmus turns blue.

3. When warmed with an ammonium salt, ammonia gas is given off.

What is used to test for chlorine?

The iodate ion (IO₃^-) can oxidize Fe²⁺ to Fe³⁺ in acid solution. If IO₃^- is reduced to iodide (I^-) in this reaction, then the number of moles of Fe²⁺ that can be oxidized by 1 mole of IO₃^- is

Which compound is a saturated hydrocarbon?

Which formula represents an unsaturated hydrocarbon?

Which statement about homologous series is not correct?

Which of the compounds shown are in the same homologous series?

1. CH₃OH      2. CH₃CH₂OH     3. CH₃COOH    4. CH₃CH₂CH₂OH

Which chemical equation for the substitution of an alkane with chlorine is correct?

Which statement about alkenes is correct?

Ethanol is manufactured from ethene.  What is an advantage of this process?

Which substance is in the same homologous series as methanol?

The partial structure of addition polymer X is shown in Figure 3.

Which monomer is used to form polymer X?

Which statements about aqueous ethanoic acid are correct?

1. It is an alkane.

2. It reacts with sodium carbonate to form carbon dioxide.

3. It changes the colour of litmus solution from blue to red.

4. It is a hydrocarbon.

Which statements about aqueous ethanoic acid are correct?

1. Ethanoic acid contains the functional group –COOH.

2. Ethanoic acid reacts with carbonates to produce hydrogen.

3. Ethanoic acid turns Universal Indicator paper blue.

4. Ethanoic acid has a pH lower than pH 7.

The structure of compound R is shown in Figure 4.

What is R?

Cooling will NOT increase the rate of dissolving salt in the water.

Stirring will allow more solute to be dissolved in a solvent.

CuSO₄ is insoluble with water.

NH₄⁺ is soluble together with all anions.

Milk is a very weak acid.

The ion Fe³⁺ forms a green precipitate with aqueous sodium hydroxide that dissolves in an excess of aqueous sodium hydroxide.

Fractional distillation is the process used to separate the fractions of crude oil.

Homologous series are groups which is largely responsible for a molecule’s chemical properties.

Alkyne are a series of hydrocarbons that contain at least one triple carbon-carbon bond.

A hydrocarbon contains only Hydrogen, Carbon and Oxygen.