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Reactivity and Chemical Properties — Free MYP3 Sciences Practice Questions
1QuestionDefinition of ReactivityConcept Practice
2 marks~3 minCriterion A
The diagram below shows part of Group 1 of the periodic table, with lithium (), sodium (), and potassium () highlighted.
a
Identify the most reactive metal among the three highlighted elements. [1]
b
Explain why that element is the most reactive of the three. [1]
Solutions
2QuestionReactivity Series of MetalsAssessment Practice
4 marks~6 minCriterion B
A student places small pieces of magnesium, zinc, and copper into separate test tubes, each containing dilute hydrochloric acid. The diagram shows the amount of bubbling observed after two minutes: magnesium produces rapid bubbling, zinc produces slow bubbling, and copper produces no bubbling.
a
Identify which metal produces the most vigorous bubbling. [1]
b
Explain what the bubbles are made of and why they form in this reaction. [1]
c
Analyse how the bubbling results can be used to rank the reactivity of the three metals, and explain what the result for copper indicates about its position relative to hydrogen in the reactivity series. [2]
Solutions
3QuestionDefinition of ReactivityAssessment Practice
6 marks~9 minCriterion D
Three metal fence posts have stood outdoors for two years. Post A is iron, Post B is aluminium, and Post C is stainless steel. Post A shows heavy orange rust; Post B and Post C look almost unchanged. All three posts are equally strong and cost similar amounts to produce.
a
Describe one difference in how iron and aluminium react with oxygen in the air. [1]
b
Explain why Post B and Post C are better choices than Post A for a fence built near the sea. [2]
c
A construction company argues that iron posts are acceptable because they are cheap and strong. Analyse this claim using the observations above and your knowledge of reactivity. [3]
Solutions
4QuestionComparing Reactivity Using ExperimentsAssessment Practice
10 marks~15 minCriterion C
A company wants to protect a new iron bridge from rust. They test three metal coatings — zinc, tin, and copper — by placing each in contact with an iron strip in salt water. After one week, the results are recorded.
Rust observed on iron strip:
Zinc coating: none
Tin coating: moderate
Copper coating: heavy
Rust observed on iron strip:
Zinc coating: none
Tin coating: moderate
Copper coating: heavy
a
Explain why zinc prevents rust on the iron strip but copper does not. [2]
b
Explain one limitation of using zinc coating to protect a large iron bridge if the coating becomes scratched or chipped. [3]
c
A student claims: "Painting the bridge would be just as effective as zinc coating because both stop rust." Analyse this claim using evidence from the experiment and your knowledge of how each method works. [5]
Solutions
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