CIE iGCSE Co-Ordinated Science C2.1 Elements, compounds and mixtures Exam Style Questions Paper 1
Question
Substance P is separated into different parts using simple physical techniques.
Substance Q is only separated into simpler parts using chemical processes.
Substance R is not separated into simpler parts by either physical or chemical processes.
Which type of substance are P, Q and R?
▶️Answer/Explanation
Ans 😀
Question
A mixture contains water, H$_{2}$O, copper chloride, CuCl$_{2}$, and barium sulfate, BaSO$_{4}$.
How many different non-metallic elements are in the mixture?
(A) 2
(B) 4
(C) 7
(D) 12
▶️Answer/Explanation
Ans: B
Question
Hexane and octane are liquid hydrocarbons that mix together.
Which apparatus is used to separate a mixture of these two liquids?
▶️Answer/Explanation
Ans : D
Question
Which diagram represents a mixture of an element and a compound?
▶️Answer/Explanation
Ans: B
Question
Different minerals contain different elements. Which mineral contains three non-metallic elements?
▶️Answer/Explanation
Ans: C
Question
Which molecule contains carbon?
A. ammonia
B. fat
C. sulfuric acid
D. water
▶️Answer/Explanation
Answer: B. fat
Explanation: Fats are organic molecules that contain carbon atoms. Ammonia (NH₃), sulfuric acid (H₂SO₄), and water (H₂O) do not contain carbon.
Question
A hydrocarbon contains twice as many hydrogen atoms as carbon atoms. What is the formula of this compound?
A. C3H6
B. C4H10
C. C2H6O
D. C3H6O
▶️Answer/Explanation
Answer: A
Explanation: A hydrocarbon with twice as many hydrogen atoms as carbon atoms would have the formula C3H6. This satisfies the condition of having twice as many hydrogen atoms as carbon atoms.