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Year 8 Exam  >  Year 8 Tests  >  Test: Chemical Changes - Year 8 MCQ

Test: Chemical Changes - Year 8 MCQ


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10 Questions MCQ Test - Test: Chemical Changes

Test: Chemical Changes for Year 8 2025 is part of Year 8 preparation. The Test: Chemical Changes questions and answers have been prepared according to the Year 8 exam syllabus.The Test: Chemical Changes MCQs are made for Year 8 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Changes below.
Solutions of Test: Chemical Changes questions in English are available as part of our course for Year 8 & Test: Chemical Changes solutions in Hindi for Year 8 course. Download more important topics, notes, lectures and mock test series for Year 8 Exam by signing up for free. Attempt Test: Chemical Changes | 10 questions in 20 minutes | Mock test for Year 8 preparation | Free important questions MCQ to study for Year 8 Exam | Download free PDF with solutions
Test: Chemical Changes - Question 1
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Which of the following is an example of a chemical change?

Detailed Solution for Test: Chemical Changes - Question 1
Burning wood results in new substances being formed, which is a characteristic of a chemical change.
Test: Chemical Changes - Question 2
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Which of the following is a pure substance?

Detailed Solution for Test: Chemical Changes - Question 2
Carbon dioxide is a compound and is considered a pure substance, whereas the others are mixtures.
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Test: Chemical Changes - Question 3
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How can you tell if a process is exothermic?

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An exothermic process releases heat, causing the temperature of the surroundings to increase.
Test: Chemical Changes - Question 4
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What is the correct word equation for the combustion of methane?
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The word equation for the combustion of methane is Methane + Oxygen → Carbon dioxide + Water.
Test: Chemical Changes - Question 5
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Which of the following best describes an endothermic reaction?
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An endothermic reaction absorbs heat from the surroundings.
Test: Chemical Changes - Question 6
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Which mixture is an example of a homogeneous mixture?
Detailed Solution for Test: Chemical Changes - Question 6
A homogeneous mixture has a uniform composition throughout, like salt dissolved in water.
Test: Chemical Changes - Question 7
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Which of the following is not evidence of a chemical change?
Detailed Solution for Test: Chemical Changes - Question 7

A change in state (solid to liquid) (option C) is a physical change because the substance remains chemically the same (ice melting to water, for example). Options A, B, and D are evidence of chemical changes: production of a gas (option A) indicates a chemical reaction, change in color (option B) can indicate a change in chemical composition, and formation of a precipitate (option D) suggests a chemical reaction has occurred.

Test: Chemical Changes - Question 8
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What is the balanced chemical equation for the combustion of methane?
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The combustion of methane is represented as CH4 + 2O2 → CO2 + 2H2O.

Test: Chemical Changes - Question 9
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Which of the following statements best describes a chemical change?
Detailed Solution for Test: Chemical Changes - Question 9

A chemical change (option C) involves a chemical reaction where one or more substances are converted into different substances with different properties. Options A, B, and D describe characteristics of physical changes rather than chemical changes: option A describes reversibility (physical change), option B describes a change in state (physical change), and option D describes a change in appearance (physical change).

Test: Chemical Changes - Question 10
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Which of the following is an example of a physical change?
Detailed Solution for Test: Chemical Changes - Question 10

Melting ice is a physical change because only the state of water changes, while its chemical composition remains the same. Options A, B, and D are chemical changes.

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