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Properties of Acids and Bases — Free MYP5 Chemistry Practice Questions
1QuestionPhysical and Chemical Properties of BasesConcept Practice
2 marks~3 minCriterion A
The diagram below shows three substances: sodium hydroxide pellets () in a beaker, aqueous ammonia () in a bottle, and a strip of magnesium ribbon.
a
Identify one substance from the diagram that is classified as a base. [1]
b
Describe one observable physical property of the base you identified, as shown in the diagram. [1]
Solutions
2QuestionCommon Examples and Uses of Acids and BasesAssessment Practice
3 marks~5 minCriterion C
When hydrochloric acid reacts with marble chips (calcium carbonate), carbon dioxide gas is produced. A student measures the volume of produced per minute at three acid concentrations, keeping temperature, mass of marble chips, and surface area constant.
Results:
Results:
| Concentration (mol dm): 0.1 | 0.5 | 1.0 |
|---|---|---|
| Rate of produced (cm min): 2 | 10 | 20 |
a
Describe the trend shown in the data. [1]
b
Explain, using collision theory, why increasing the concentration of hydrochloric acid increases the rate of reaction. [1]
c
A student claims that doubling the concentration always doubles the rate of reaction. Evaluate this claim using the data provided. [1]
Solutions
3QuestionConductivity of Acidic and Basic SolutionsAssessment Practice
5 marks~8 minCriterion D
Data
| Location A (near an industrial city) | pH = 4.2 | conductivity = 850 µS/cm |
|---|---|---|
| Location B (in a forest) | pH = 5.6 | conductivity = 45 µS/cm |
| Location C (coastal area) | pH = 5.9 | conductivity = 120 µS/cm |
A student collects rainwater from three locations and records the following
a
Explain why the conductivity of the rainwater at Location A is significantly higher than at Location B. [2]
b
Location C has a higher conductivity than Location B despite having a less acidic pH. Explain what this suggests about the relationship between conductivity and acid pollution. [1]
c
Discuss the limitations of using conductivity as the sole indicator of water pollution or ecological harm, using data from all three locations to support your answer. [2]
Solutions
4QuestionCommon Examples and Uses of Acids and BasesAssessment Practice
2 marks~3 minCriterion B
A student tests four household substances with red cabbage indicator and records the following results.
| Substance | lemon juice | vinegar | baking soda solution | soap solution |
|---|---|---|---|---|
| pH | 2 | 3 | 9 | 10 |
| Indicator colour | red | red | blue | blue |
a
Identify the pattern relating pH to the colour of red cabbage indicator. [1]
b
A scientist tests milk (pH 6) and tomato juice (pH 4) with red cabbage indicator. Both solutions appear the same colour. Deduce whether this result supports or contradicts the pattern you identified in (a), and justify your reasoning. [1]
Solutions
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