Exploring Diversity of Matter by its Chemical Composition

Which set contains only compounds?

• sodium chloride, water, carbon dioxide

• oxygen, nitrogen, water vapour

• air, crude oil, bronze

• oxygen, sodium chloride, seawater

Which pair of elements have the same chemical properties?

• P and Q

• Q and T

• R and S

• S and T

Elements in the same row are in the same period. They change from metallic properties (left) to non-metallic properties (right).

• True

• False

_____________ or ______________ is usually given out or taken in when compounds are formed.

• Water

• Light

• Heat

• Gas

A suspension is a mixture in which __________________ substances are suspended in a liquid or gas.

• transparent

• soluble

• translucent

• insoluble

The following factors affects the rate of dissolving:

• Surface area/ particle size

• Type of beaker

• Rate of stirring

• Temperature

Which factor does not affect the solubility of a substance?

• Temperature

• Type of solute

• Type of solvent

• Surface area/ particle size

Which of the following statements about the Periodic Table is correct?

• Elements are arranged according to their chemical symbols.

• Metals are found on the right-hand side.

• The zigzag line divides the elements into metals and non-metals.

• There are more non-metals than metals.

Substance X is added to distilled water, stirred and then filtered. A black solid is obtained as the residue and a blue solution is obtained as the filtrate.

Using the observations, which of the statements is correct?

• The black solid is an element.

• The blue solution is a compound.

• Substance X is a compound.

• Substance X is a mixture.

Which best describes the picture shown?

• element

• compound

• mixture of elements and compounds

• mixture of compounds