Grade 9 Chemistry: Composition
This worksheet covers fundamental concepts of chemical composition for Grade 9 science students, including atomic structure, elements, compounds, and mixtures.
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Grade 9 Chemistry: Composition
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Read each question carefully and provide your best answer. Show all your work for calculations.
1. Which of the following best describes an element?
A substance formed when two or more elements are chemically bonded.
A pure substance consisting of only one type of atom.
A combination of two or more substances that are not chemically bonded.
A substance that can be broken down into simpler substances by physical means.
2. The chemical formula for water is H₂O. This indicates that water is a/an:
Element
Homogeneous mixture
Compound
Heterogeneous mixture
3. The smallest unit of an element that retains the chemical identity of that element is called an .
4. A substance made up of two or more different elements chemically bonded together in a fixed ratio is a .
5. All mixtures can be easily separated by physical means.
True
False
6. A solution is a type of heterogeneous mixture.
True
False
7. Differentiate between a homogeneous mixture and a heterogeneous mixture, providing an example for each.
8. Describe the basic structure of an atom, naming its main subatomic particles and their charges.
Observe the diagram below and answer the question.
9. Based on the diagram of atomic structure, identify the particles found in the nucleus and those orbiting around it. What are their respective charges?