Sec 2 G3 Ch 3, 4, 8 Revision

A section of the Periodic Table is shown with five different elements, V, W, X, Y and Z. These are not the chemical symbols of the elements.

Which two elements have similar chemical properties?

• W and Z

• V and Y

• W and X

• X and Y

Answer explanation

Elements in the same group of the Periodic Table have similar chemical properties.

Which two elements are metals?

• V and Z

• X and Z

• X and Y

• V and W

Answer explanation

Elements on the left side of the Periodic Table (in yellow) are metals.

Elements on the right side, including hydrogen (in blue) are non-metals.

Which group consists of one mixture, one element and one compound?

• air, water and sugar

• aluminium, water and oxygen gas

• calcium, air and carbon dioxide

• iron, calcium and oxygen gas

Answer explanation

Mixtures can be made up of:

elements only e.g. steel (iron, carbon) and pewter (tin, copper, silver)

compounds only e.g. salt solution (sodium chloride and water)

both elements and compounds e.g. sea water (sodium chloride, water, iodine) and air (oxygen, nitrogen, carbon dioxide)

Bronze is made of copper and tin.

Which statement best supports the fact that bronze is a mixture?

• It can be made from different proportions of copper and tin.

• It can be separated into pure copper and tin by chemical reactions only.

• It is a good conductor of electricity.

• It is made from more than one element.

Answer explanation

The constituents of mixtures do not have a fixed proportion.

Substance X is a green substance with a fixed composition. When it is heated, carbon dioxide gas is given off and a black substance Y is left behind.

Substance Y cannot be broken down by physical method.

What is the identity of substance X and Y?

• A

• B

• C

• D

Answer explanation

A compound cannot be separated into its constituents easily - chemical processes have to be used.

A mixture can be separated into its constituents easily - physical processes can be used.

Which of the following is not an example of a suspension?

• salt water

• orange juice

• Milo drink

• drain water

Answer explanation

A suspension is a mixture that contains insoluble substances in a solvent.

Salt water is a solution as salt dissolves in water.

Information about three substances P, R and S is given below.

P: sodium nitrate (soluble in water)

R: water

S: mixture of sodium nitrate and water

Which row correctly identifies the solute, solvent and solution?

• A

• B

• C

• D

Answer explanation

A solution is a mixture in which one substance dissolves completely in another substance.

The substance that dissolves in the solute.

The substance in which the solute dissolves in the solvent.

In filtration, what does the term 'filtrate' refer to?

• the type of filter paper used

• the mixture before separation

• the liquid that drains through the filter paper

• the solid that remains on the filter paper

Answer explanation

'Residue' refers to the solid that remains on the filter paper.

Which of the following is not a consideration when carrying out chromatography?

• using a pencil to draw the start line

• use only a small amount of the substance to be separated at the start line

• ensure that the start line is submerged in the solvent

• cover the chromatography jar with a lid

Answer explanation

The start line is where the sample is placed, so it must be above the solvent and not submerged.

The chromatogram is obtained using two different dyes F₁ and F₂ and four solutions A, B, C and D.

Which solution contains both dyes F₁ and F₂?

• A

• B

• C

• D