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Questions and Answers
What changes occur when an iron object is left exposed to a humid atmosphere?
What changes occur when an iron object is left exposed to a humid atmosphere?
It rusts.
What happens to milk when it is left at room temperature during summers?
What happens to milk when it is left at room temperature during summers?
It spoils or goes sour.
What occurs during the fermentation of grapes?
What occurs during the fermentation of grapes?
Alcohol is produced.
What happens to food when it is cooked?
What happens to food when it is cooked?
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What occurs during digestion in our body?
What occurs during digestion in our body?
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What happens when we respire?
What happens when we respire?
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A chemical reaction can be identified by a change in state.
A chemical reaction can be identified by a change in state.
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Burning magnesium ribbon produces magnesium sulfate.
Burning magnesium ribbon produces magnesium sulfate.
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What is the product formed when magnesium burns in air?
What is the product formed when magnesium burns in air?
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Which observation indicates that a chemical reaction has taken place?
Which observation indicates that a chemical reaction has taken place?
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Magnesium + Oxygen → ______
Magnesium + Oxygen → ______
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Study Notes
Chemical Reactions and Equations
- Chemical reactions are processes where the nature and identity of substances change.
- Examples include: milk spoiling, iron rusting, grape fermentation, cooking, digestion, and respiration.
- Chemical reactions can be identified by changes in state, color, gas evolution, or temperature.
Chemical Equations
- Chemical reactions are often represented in a short form called a word-equation.
- Word-equations show the reactants and products of a reaction.
- For example, the burning of magnesium in oxygen can be represented as: Magnesium + Oxygen → Magnesium oxide.
- Reactants are the substances that undergo a chemical change.
- Products are the newly formed substances.
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Description
Test your understanding of chemical reactions and how they are represented through equations. This quiz covers various examples of chemical processes, their identification, and the formation of reactants and products. Enhance your knowledge about the nature of substances and their transformations.
