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Questions and Answers
What is the primary difference between a compound and a mixture?
What is the primary difference between a compound and a mixture?
- Compounds are made up of elements, while mixtures are made up of compounds
- Compounds are always homogeneous, while mixtures can be homogeneous or heterogeneous (correct)
- Mixtures can be separated by physical means, while compounds cannot
- Compounds have variable compositions, while mixtures have fixed compositions
Which of the following is an example of a pure substance?
Which of the following is an example of a pure substance?
- Saltwater
- Air
- Mud
- Gold (correct)
What type of change occurs when water evaporates?
What type of change occurs when water evaporates?
- Irreversible change
- Chemical change
- Nuclear change
- Physical change (correct)
Flashcards
Difference between compound and mixture
Difference between compound and mixture
Compounds are always homogeneous mixtures, while mixtures can be either homogeneous or heterogeneous.
Example of pure substance
Example of pure substance
Gold is an example of a pure substance.
Water evaporating
Water evaporating
Water evaporating is a physical change.
Study Notes
Chemical Substances
- A compound is a substance formed by the chemical combination of two or more different elements, whereas a mixture is a physical blend of two or more substances.
Pure Substances
- A pure substance is a substance that has a fixed composition and consistent properties throughout.
- Examples of pure substances include elements, such as oxygen (O2) and carbon (C), and compounds, such as water (H2O) and salt (NaCl).
Physical Changes
- Evaporation is a type of physical change, where a substance changes from a liquid to a gas state, but its chemical composition remains the same.
- In the case of water evaporating, the molecules change from a liquid to a gas state, but the chemical composition of H2O remains constant.
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Description
This test paper includes questions on the classification of matter, presented in ascending order of difficulty. It consists of matching questions with four options and multiple choice questions with four options, where only one option is correct.
