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Questions and Answers
What happens when milk is left at room temperature during summer?
What happens when milk is left at room temperature during summer?
The milk undergoes a chemical change, leading to spoilage.
What is formed when magnesium burns in air?
What is formed when magnesium burns in air?
- Magnesium chloride
- Magnesium sulfate
- Magnesium oxide (correct)
- Magnesium hydroxide
Chemical reactions only involve the change in state of substances.
Chemical reactions only involve the change in state of substances.
False (B)
What is a word-equation for the reaction between magnesium and oxygen?
What is a word-equation for the reaction between magnesium and oxygen?
In Activity 1.2, you add potassium iodide solution to _________.
In Activity 1.2, you add potassium iodide solution to _________.
What are the signs that indicate a chemical reaction has taken place?
What are the signs that indicate a chemical reaction has taken place?
What should you do when burning magnesium ribbon?
What should you do when burning magnesium ribbon?
Which substance is a product in the burning of magnesium?
Which substance is a product in the burning of magnesium?
What happens to milk when left at room temperature during summers?
What happens to milk when left at room temperature during summers?
What do we observe when burning a magnesium ribbon?
What do we observe when burning a magnesium ribbon?
What is formed when magnesium burns in air?
What is formed when magnesium burns in air?
Which of the following indicates that a chemical reaction has taken place? (Select all that apply)
Which of the following indicates that a chemical reaction has taken place? (Select all that apply)
What is the word-equation for the reaction between magnesium and oxygen?
What is the word-equation for the reaction between magnesium and oxygen?
What are the reactants in the word-equation: Magnesium + Oxygen → Magnesium oxide?
What are the reactants in the word-equation: Magnesium + Oxygen → Magnesium oxide?
What safety precautions should be taken while performing the magnesium burning activity?
What safety precautions should be taken while performing the magnesium burning activity?
A word-equation is a long description of a chemical reaction.
A word-equation is a long description of a chemical reaction.
The new substance formed during a chemical reaction is called a ______.
The new substance formed during a chemical reaction is called a ______.
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Study Notes
Introduction to Chemical Reactions
- Examples from daily life illustrate chemical reactions: spoiled milk, rusting iron, fermentation, cooking, digestion, and respiration.
- Chemical changes imply a transformation in the nature and identity of substances.
Understanding Chemical Reactions
- A chemical reaction indicates a process where substances undergo change.
- Recognizing a chemical reaction can include various signs of change.
Experimental Activities
-
Activity 1.1: Burning Magnesium
- Burn a clean magnesium ribbon (approx. 2 cm) to observe it turn into magnesium oxide.
- Magnesium burns with a bright white flame, producing a white powder (magnesium oxide).
-
Activity 1.2: Lead Nitrate and Potassium Iodide Reaction
- Mixing lead nitrate solution with potassium iodide reveals observable changes.
-
Activity 1.3: Zinc and Acid Reaction
- Add dilute hydrochloric or sulfuric acid to zinc granules and note changes, including temperature shifts.
Identifying Chemical Reactions
- Observations indicating chemical reactions:
- Change in state (solid, liquid, gas)
- Change in color
- Gas evolution (bubbles, fizzing)
- Change in temperature (endothermic or exothermic reactions)
Chemical Equations
- Representing reactions in simplified forms:
- Example reaction: Magnesium + Oxygen → Magnesium oxide.
- Reactants (magnesium and oxygen) undergo a change to form a product (magnesium oxide).
Key Terms
- Reactants: Substances that undergo change during a chemical reaction.
- Products: New substances formed as a result of the reaction.
Introduction to Chemical Reactions
- Examples from daily life illustrate chemical reactions: spoiled milk, rusting iron, fermentation, cooking, digestion, and respiration.
- Chemical changes imply a transformation in the nature and identity of substances.
Understanding Chemical Reactions
- A chemical reaction indicates a process where substances undergo change.
- Recognizing a chemical reaction can include various signs of change.
Experimental Activities
-
Activity 1.1: Burning Magnesium
- Burn a clean magnesium ribbon (approx. 2 cm) to observe it turn into magnesium oxide.
- Magnesium burns with a bright white flame, producing a white powder (magnesium oxide).
-
Activity 1.2: Lead Nitrate and Potassium Iodide Reaction
- Mixing lead nitrate solution with potassium iodide reveals observable changes.
-
Activity 1.3: Zinc and Acid Reaction
- Add dilute hydrochloric or sulfuric acid to zinc granules and note changes, including temperature shifts.
Identifying Chemical Reactions
- Observations indicating chemical reactions:
- Change in state (solid, liquid, gas)
- Change in color
- Gas evolution (bubbles, fizzing)
- Change in temperature (endothermic or exothermic reactions)
Chemical Equations
- Representing reactions in simplified forms:
- Example reaction: Magnesium + Oxygen → Magnesium oxide.
- Reactants (magnesium and oxygen) undergo a change to form a product (magnesium oxide).
Key Terms
- Reactants: Substances that undergo change during a chemical reaction.
- Products: New substances formed as a result of the reaction.
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