IGCSE Chemistry: Specimen Questions with Answers 228 - 230 of 240

Doorsteptutor material for Bank-PO is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of Bank-PO.

Question 228

Write in Short

Short Answer▾

A student followed the course of this reaction by measuring the volume of oxygen released over a period of time.

The diagram below shows some results that he obtained using hydrogen peroxide at three different concentrations.

Hydrogen Peroxide
Describe how the concentration of hydrogen peroxide affects the rate of this reaction.

Explanation

Concentration of Hydrogen per oxide affect the reaction by increasing the rate of reaction the hydrogen per oxide will be concentrated then time taken to complete the reaction will be less. Data is given below.

Concentration of Hydrogen

Question 229

Question

MCQ▾

When a Chalk piece is added to Vinegar, it ________.

Choices

Choice (4)

a.

Remains the same

b.

Changes its colour to blue.

c.

Disintegrates

d.

Dissolves to from a solution

Answer

c.

Explanation

When a Chalk (calcium carbonate) piece is added to Vinegar (acetic acid) , it disintegrates.

Question 230

Write in Short

Short Answer▾

Describe a test, other than measuring pH, which can be carried out on both acid solutions to confirm the explanation given in for the different pH values of the two acids.

Complete the following equations for reactions of these two acids.

Explanation

.

Developed by: