Multiple Choice
Which of the following methods can cause a substance to change from a solid to a liquid or from a liquid to a gas?
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1. Intro to General Chemistry
Physical & Chemical Changes
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Which of the following scenarios is an example of a physical change?
A
Burning of methane (CH4) in oxygen
B
Iron rusting to form Fe2O3
C
Baking a cake
D
Ice melting to form liquid water
Verified step by step guidance1
Understand the difference between physical and chemical changes: A physical change affects the form or state of a substance without changing its chemical identity, while a chemical change results in the formation of new substances with different chemical properties.
Analyze each scenario to determine if the chemical composition changes: Burning methane (CH4) in oxygen produces new substances (CO2 and H2O), so it is a chemical change.
Iron rusting to form Fe2O3 involves the formation of a new compound (iron oxide), indicating a chemical change.
Baking a cake involves chemical reactions that produce new substances, so it is a chemical change.
Ice melting to form liquid water changes the state from solid to liquid but does not change the chemical composition (H2O remains H2O), so this is a physical change.
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