CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 1
12 Seconds Remaining Approximately how many chemical elements are there? • About 50. • About 80. • About 100. • About 150.
15 Seconds Remaining What is formed when two or more substances come together without reacting? • A compound. • A mixture. • An element. • A solution.
15 Seconds Remaining Which line shows something that always happens in a chemical reaction? • A gas is given off. • Heat energy is absorbed. • A colour change occurs. • A new substance is formed.
15 Seconds Remaining In a precipitation reaction • two solutions are mixed and a gas is given off. • two solutions are mixed and there is a colour change. • two solutions are mixed and heat energy is given out. • two solutions are mixed and an insoluble solid is formed.
12 Seconds Remaining Which of following does not show a chemical reaction? • A match burning. • Water boiling in a kettle. • Frying an egg. • Glue setting.
12 Seconds Remaining What is the symbol for caesium? • Cs • Cu • Co • Ca
12 Seconds Remaining The name given to a solid which dissolves in a liquid is the • solution. • solvent. • solute. • saturate.
15 Seconds Remaining Which elements has the symbol Ca • Carbon.. • Caesium. • Californium. • Calcium.
15 Seconds Remaining In an exothermic reaction • Heat energy is given out. • Heat energy is taken in. • A gas is given off. • A solid is formed.
15 Seconds Remaining Which elements are present in sodium carbonate? • Carbon and sodium. • Sodium and oxygen. • Sodium, hydrogen and oxygen. • Sodium, carbon and oxygen.
15 Seconds Remaining Which metal gives an orange-red flame colour.(You may wish to refer to page 4 of the data booklet) • Calcium. • Sodium. • Copper. • Potassium.
15 Seconds Remaining Which metal was discovered in the year 1775? (You may wish to refer to page 8 of the data booklet) • Potassium. • Magnesium. • Zinc.. • Calcium.