20 Questions
What is the nature of change observed when milk is left at room temperature during summers?
Chemical change
When an iron tawa/pan/nail is left exposed to humid atmosphere, what kind of change occurs?
Chemical change
What kind of change occurs when grapes get fermented?
Chemical change
What type of change takes place when food is cooked?
Chemical change
In which type of change does food get digested in our body?
Chemical change
What is the word-equation for the reaction between magnesium and oxygen to form magnesium oxide?
Magnesium + Oxygen -> Magnesium oxide
What observations can help determine whether a chemical reaction has taken place?
Change in state, change in color, evolution of a gas, change in temperature
What is the product formed when lead nitrate solution is mixed with potassium iodide solution?
Lead iodide
In Activity 1.3, what happens when dilute hydrochloric acid or sulphuric acid is added to zinc granules?
Evolution of a gas
What is the most concise and useful way for representing chemical equations?
Using chemical formulae
What is the most concise and useful way for representing chemical equations?
Using symbols and formulas
What observations can help determine whether a chemical reaction has taken place?
Change in color, formation of a precipitate, evolution of gas, or change in temperature
What is the nature of change observed when milk is left at room temperature during summers?
Chemical change
In which type of change does food get digested in our body?
Chemical change
What kind of change occurs when grapes get fermented?
Chemical change
Which observation helps determine whether a chemical reaction has taken place?
Change in state
What is the word-equation for the reaction between lead nitrate solution and potassium iodide solution?
Lead nitrate solution + Potassium iodide solution → Lead iodide + Potassium nitrate
What type of change occurs when zinc granules react with dilute hydrochloric acid or sulphuric acid?
Chemical change
What is the most concise and useful way for representing chemical equations?
Using chemical formulae
What is formed when magnesium ribbon burns in oxygen?
Magnesium oxide
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.
Test your understanding of chemical reactions and equations with this quiz. Explore the concepts of reactions in daily life and how substances change under different conditions.
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