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