Podcast
Questions and Answers
What is the nature of change observed when milk is left at room temperature during summers?
What is the nature of change observed when milk is left at room temperature during summers?
- Biological change
- No change
- Physical change
- Chemical change (correct)
When an iron tawa/pan/nail is left exposed to humid atmosphere, what kind of change occurs?
When an iron tawa/pan/nail is left exposed to humid atmosphere, what kind of change occurs?
- No change
- Chemical change (correct)
- Electrical change
- Physical change
What kind of change occurs when grapes get fermented?
What kind of change occurs when grapes get fermented?
- No change
- Physical change
- Chemical change (correct)
- Biological change
What type of change takes place when food is cooked?
What type of change takes place when food is cooked?
In which type of change does food get digested in our body?
In which type of change does food get digested in our body?
What is the word-equation for the reaction between magnesium and oxygen to form magnesium oxide?
What is the word-equation for the reaction between magnesium and oxygen to form magnesium oxide?
What observations can help determine whether a chemical reaction has taken place?
What observations can help determine whether a chemical reaction has taken place?
What is the product formed when lead nitrate solution is mixed with potassium iodide solution?
What is the product formed when lead nitrate solution is mixed with potassium iodide solution?
In Activity 1.3, what happens when dilute hydrochloric acid or sulphuric acid is added to zinc granules?
In Activity 1.3, what happens when dilute hydrochloric acid or sulphuric acid is added to zinc granules?
What is the most concise and useful way for representing chemical equations?
What is the most concise and useful way for representing chemical equations?
What is the most concise and useful way for representing chemical equations?
What is the most concise and useful way for representing chemical equations?
What observations can help determine whether a chemical reaction has taken place?
What observations can help determine whether a chemical reaction has taken place?
What is the nature of change observed when milk is left at room temperature during summers?
What is the nature of change observed when milk is left at room temperature during summers?
In which type of change does food get digested in our body?
In which type of change does food get digested in our body?
What kind of change occurs when grapes get fermented?
What kind of change occurs when grapes get fermented?
Which observation helps determine whether a chemical reaction has taken place?
Which observation helps determine whether a chemical reaction has taken place?
What is the word-equation for the reaction between lead nitrate solution and potassium iodide solution?
What is the word-equation for the reaction between lead nitrate solution and potassium iodide solution?
What type of change occurs when zinc granules react with dilute hydrochloric acid or sulphuric acid?
What type of change occurs when zinc granules react with dilute hydrochloric acid or sulphuric acid?
What is the most concise and useful way for representing chemical equations?
What is the most concise and useful way for representing chemical equations?
What is formed when magnesium ribbon burns in oxygen?
What is formed when magnesium ribbon burns in oxygen?
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Study Notes
Chemical Changes and Reactions
- Milk left at room temperature during summers undergoes decomposition, a type of chemical change.
- Iron objects exposed to humid atmosphere undergo rusting, a type of chemical change.
- Grapes fermenting undergo a chemical change, resulting in the production of wine.
- Cooking food involves a chemical change, as the ingredients are transformed into a new substance.
- Digestion of food in the body involves a chemical change, where complex molecules are broken down into simpler ones.
Chemical Reactions
- The word-equation for the reaction between magnesium and oxygen to form magnesium oxide is: Magnesium + Oxygen → Magnesium Oxide.
- Observations that can help determine whether a chemical reaction has taken place include:
- Change in color
- Evolution of gas
- Formation of a precipitate
- Change in temperature
- Production of a new substance
Chemical Equations
- The most concise and useful way for representing chemical equations is through chemical formulas, which use symbols and formulas to represent the reactants and products.
Reactions and Products
- When lead nitrate solution is mixed with potassium iodide solution, a yellow precipitate of lead iodide is formed.
- When dilute hydrochloric acid or sulphuric acid is added to zinc granules, hydrogen gas is produced, and zinc chloride or zinc sulphate is formed.
- When magnesium ribbon burns in oxygen, magnesium oxide is formed.
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