Chemical Change Fundamentals
Explore the principles of chemical change, including identifying reactions, understanding energy changes, and balancing equations for Grade 11 Chemistry.
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Chemical Change Fundamentals
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Read each question carefully and provide the best answer. Show all your work for calculations.
1. Which of the following is NOT an indicator of a chemical change?
Formation of a precipitate
Change in state (solid to liquid)
Production of a gas
Significant temperature change
2. What type of reaction absorbs energy from its surroundings?
Exothermic
Endothermic
Combustion
Decomposition
3. In a chemical reaction, the starting materials are called , and the substances formed are called .
4. The law of of mass states that matter cannot be created or destroyed in a chemical reaction.
5. Describe the main difference between a physical change and a chemical change, providing an example for each.
6. Rusting of iron is an example of a physical change.
True
False
7. Balancing a chemical equation ensures that the law of conservation of energy is upheld.
True
False
8. Observe the diagram below showing a type of chemical bond.
a) Identify the type of chemical bond shown in the diagram.
b) Briefly explain how this type of bond is formed.