Natural Sciences Grade 9 - Multiple Choice Questions

The elements in the periodic table are arranged in:

• A. Increasing order of their atomic mass

• B. Increasing order of their atomic number

• C. Decreasing order of their atomic number

• D. A random way selected by scientists

Why are the elements Li and K in the same group on the periodic table?

• A. Their atomic numbers are the same.

• B. They have similar chemical properties.

• C. Both are non-metals.

• D. They do not react with oxygen.

In the diagrams below, hydrogen atoms are represented by white circles, and oxygen atoms are represented by black circles. Which of the diagrams best represents water?

• A

• B

• C

• D

Which of the following indicates a chemical reaction?

• Dissolving of a substance

• Filtration of a substance

• A colour change or formation of bubbles in a substance

• Melting or freezing of a substance

Which of the following statements is true regarding a balanced chemical equation?

• The number of atoms of each element is the same on both sides of the equation.

• The coefficients represent the mass of the substances in the reaction.

• The subscripts can be changed to balance the equation.

• Balancing is not necessary for chemical equations.

Which of the following substances is considered acidic on the pH scale?

• Lemon juice (pH 2)

• Baking soda (pH 8)

• Table salt (pH 7)

• Pure water (pH 7)

Which is NOT evidence that a chemical reaction has occurred?

• Milk which tastes sour

• Steam that condenses on a cold window

• A strong odour coming from a broken egg

• A slice of raw potato changing colour

The classification system for the elements which make up matter and materials in the world.

• Periodic Table

• Mendeleev Chart

• Atomic Model

• Elemental Grid

Items on the left of a chemical equation.

• Reactants

• Products

• Catalysts

• Solvents

Give the correct scientific term for each of the following descriptions. Write only the term in the spaces provided. The substance formed when carbon is burnt completely in the presence of oxygen.

• Carbon dioxide

• Carbon monoxide

• Methane

• Ozone