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Questions and Answers
What are the observations that help determine whether a chemical reaction has taken place?
What are the observations that help determine whether a chemical reaction has taken place?
- Change in shape, change in color, evolution of a liquid, change in pressure
- Change in state, change in color, change in texture, change in volume
- Change in state, change in color, evolution of a gas, change in temperature (correct)
- Change in size, change in texture, evolution of a gas, change in temperature
What is formed when magnesium ribbon burns in air?
What is formed when magnesium ribbon burns in air?
- Magnesium hydroxide
- Magnesium nitrate
- Magnesium chloride
- Magnesium oxide (correct)
What is the result of the reaction between magnesium and oxygen present in the air?
What is the result of the reaction between magnesium and oxygen present in the air?
- Magnesium hydroxide
- Magnesium oxide (correct)
- Magnesium carbonate
- Magnesium sulfate
What is the activity 1.1 described as?
What is the activity 1.1 described as?
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What do we say has occurred when a chemical change takes place?
What do we say has occurred when a chemical change takes place?
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