Chapter 3: Chemical Composition

The element Q and P combine to form a compound. Which of the statements is correct about the new compound QP?

• QP will have properties different from Q and P.

• QP will have properties similar from Q and P.

• QP will have properties similar to Q but not P.

• QP will have properties similar to P but not Q.

Study the periodic table. Which of the following pair of elements are non-metals found in the same group?

• Mg and Cl

• He and Kr

• Mg and Ba

• Ta and Ru

Which of the following groups consists of compounds only?

• common salt, air and milk

• oxygen, nitrogen and soya sauce

• silver, mercury and iodine

• sugar, water and carbon dioxide

Which of the following will give rise to the fastest rate of dissolving?

• size of solute: large, temperature of solvent: high

• size of solute: large, temperature of solvent: low

• size of solute: small, temperature of solvent: high

• size of solute: small, temperature of solvent: low

What is the solvent in a cup of hot tea with milk and sugar?

• hot water

• milk

• sugar

• tea

Which of the following forms a suspension?

• ice and water

• salt and water

• sugar and water

• chalk powder and water

Jack wanted to find out the solubility of powder M in four different solvents, P, Q, R and S. He wrote his findings in the table below.

Assuming that the same amount of powder M and the same volume of solvents were used for the experiment, arrange the solubility of the four solvents with regards to powder M in descending order.

• P, R, S, Q

• P, S, R, Q

• Q, R, S, P

• Q, S, R, P

Beaker J contains 5.0g of fine sugar and Beaker K contains 5.0g of sugar cubes. The contents were stirred and the time taken for the contents to be dissolved was recorded. Which beaker took more time for the sugar to dissolve and why?

• Beaker J, the total surface area of the sugar is lesser due to its large particle size.

• Beaker K, the total surface area of the sugar is lesser due to its large particle size.

• Beaker J, the total surface area of the sugar is greater due to its small particle size.

• Beaker K, the total surface area of the sugar is greater due to its large particle size.

Which of the following liquids is not a suspension?

• Liquid P: colourless

• Liquid Q: cloudy

• Liquid R: has insoluble particles floating on top

• Liquid S: has insoluble particles settled on the bottom

How are the elements in the Periodic Table arranged?

• according to density

• according to their weight

• according to proton number

• according to the group number