Multiple Choice
Which of the following is NOT a sign of a chemical change?
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1. Intro to General Chemistry
Physical & Chemical Changes
Multiple Choice
Which of the following best describes the main difference between physical properties and chemical properties?
A
Chemical properties are only observed at high temperatures, while physical properties are observed at room temperature.
B
Physical properties always involve a change in composition, while chemical properties do not.
C
Physical properties can be observed without changing the substance's chemical identity, while chemical properties describe the ability of a substance to undergo chemical changes.
D
Physical properties are unique to each element, while chemical properties are the same for all substances.
Verified step by step guidance1
Step 1: Understand the definition of physical properties. Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, melting point, boiling point, density, and state of matter.
Step 2: Understand the definition of chemical properties. Chemical properties describe a substance's ability to undergo chemical changes or reactions that transform it into different substances. Examples include flammability, reactivity with acids, and oxidation states.
Step 3: Compare the two types of properties. Physical properties can be observed without altering the substance's composition, while chemical properties involve changes that alter the substance's chemical structure.
Step 4: Evaluate the given options based on these definitions. Identify which statement correctly contrasts physical and chemical properties according to their fundamental nature.
Step 5: Conclude that the best description is: 'Physical properties can be observed without changing the substance's chemical identity, while chemical properties describe the ability of a substance to undergo chemical changes.' This accurately captures the main difference.
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