객관식
Water is known as a polar molecule because:
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1. Intro to General Chemistry
Chemical Properties
객관식
Which of the following represents a chemical property of hydrogen gas?
A
It exists as a gas at room temperature.
B
It is less dense than air.
C
It reacts explosively with oxygen gas.
D
It is a colorless gas.
E
It is a tasteless molecule.
검증된 단계별 안내1
Understand the difference between physical and chemical properties: Physical properties can be observed or measured without changing the substance's identity, while chemical properties describe how a substance interacts with other substances, leading to a change in its chemical composition.
Review each option and classify it as a physical or chemical property. For example, 'It exists as a gas at room temperature' describes a state of matter, which is a physical property.
Consider 'It is less dense than air'—density is a physical property because it relates to mass and volume without changing the substance chemically.
Look at 'It reacts explosively with oxygen gas'—this describes a chemical reaction where hydrogen changes into new substances (like water), so this is a chemical property.
Confirm that 'It is a colorless gas' and 'It is a tasteless molecule' are physical properties because they describe sensory characteristics without altering the chemical identity.
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