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Questions and Answers
What is the primary difference between a compound and a mixture?
Which of the following is an example of a pure substance?
What type of change occurs when water evaporates?
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.
