iGCSE Chemistry (0620) Core:12.1 Experimental design: Exam Style Questions Paper 1

Question

Which piece of apparatus is used to measure exactly 21.50 cm³ of dilute sulfuric acid?

A) beaker
B) burette
C) measuring cylinder
D) volumetric pipette

▶️ Answer/Explanation

Solution

Ans: B

Let’s evaluate each option:

A) Beaker: Not precise, only used for rough measurements.

B) Burette: Can measure variable volumes accurately to ±0.05 cm³, perfect for measuring exactly 21.50 cm³.

C) Measuring cylinder: Less precise than a burette, typically accurate to ±0.5 cm³.

D) Volumetric pipette: Only measures fixed volumes (like 25.00 cm³), can’t measure 21.50 cm³.

The burette is the only apparatus that can measure an exact volume like 21.50 cm³ with high precision.

A sign displayed in a flour mill is shown.

Which statement explains why there is a danger of explosion in a flour mill?
A Flour burns very quickly because it is a fine powder.

B Flour is a catalyst for combustion.

C Flour mills get hot and speed up the rate of combustion.

D The combustion of flour is exothermic.

▶️Answer/Explanation

Ans:A

The apparatus shown is used to prepare aqueous copper(II) sulfate.

What are X and Y?

▶️Answer/Explanation

Ans:C

Fermentation of sugar produces a mixture of ethanol solution and solid yeast. How is the solid yeast removed from the mixture?

A. crystallisation
B. distillation
C. filtration
D. fractional distillation

Answer/Explanation

Ans:

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