CIE iGCSE Co-Ordinated Science C8.1 Arrangement of elements Exam Style Questions Paper 1
Question
When a small piece of potassium is placed in water, hydrogen gas is given off very quickly. Which element reacts in a similar way?
A copper
B iron
C magnesium
D sodium
▶️Answer/Explanation
Answer: D sodium
Explanation: Sodium, like potassium, is an alkali metal and reacts vigorously with water to produce hydrogen gas. Both elements are in Group 1 of the Periodic Table, which means they have similar chemical properties, including their reactivity with water.
Question
Part of the Periodic Table is shown.
Which statement is not correct?
A W and X are metallic elements.
B W and Z form an ionic compound.
C X and Y form a covalent compound.
D Z is a non-metallic element.
▶Answer/Explanation
Answer: C
Explanation: X and Y are both non-metals, so they would form a covalent compound, not an ionic one. The other statements are correct.
Question
The diagram shows overlapping circles into which different chemical formulae can be placed.
Which formula can be placed in the shaded area because it has all three properties?
A Br2 B CO C Cu D Na
▶️Answer/Explanation
Ans : C
Question
Which element is used in the manufacture of sulfuric acid?
A carbon
B hydrogen
C nitrogen
D sulfur
▶️Answer/Explanation
Ans : D