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Questions and Answers
What is the characteristic of a chemical reaction observed when solid wax is burnt?
What is the characteristic of a chemical reaction observed when solid wax is burnt?
- Change in color
- Change in state (correct)
- Formation of precipitate
- Evolution of gas
What is the result of the reaction between lead nitrate and potassium iodide?
What is the result of the reaction between lead nitrate and potassium iodide?
- A gas is evolved
- Colorless liquid is formed
- A white precipitate is formed
- A yellow precipitate is formed (correct)
What is the term for the solid substance formed from liquids in a chemical reaction?
What is the term for the solid substance formed from liquids in a chemical reaction?
- Reactant
- Precipitate (correct)
- Precursor
- Product
What is the characteristic of a chemical reaction observed when metal reacts with acid?
What is the characteristic of a chemical reaction observed when metal reacts with acid?
What is the result of a chemical reaction that involves a change from solid to liquid or gas?
What is the result of a chemical reaction that involves a change from solid to liquid or gas?
Study Notes
Characteristics of a Chemical Reaction
- A chemical reaction can result in a change of state, such as the burning of solid wax forming water vapor and CO2 gas.
- Chemical reactions can cause a change in color, as observed in the reaction between lead nitrate and potassium iodide, which turns the colorless liquid to yellow.
- Evolution of gas is another characteristic of a chemical reaction, e.g., the formation of H2 gas when a metal reacts with acid.
- Chemical reactions can also involve a change in temperature.
- The formation of a precipitate is a characteristic of a chemical reaction, such as the yellow precipitate of lead iodide formed in the reaction between lead nitrate and potassium iodide.
- A precipitate is a solid substance that forms from liquids in a chemical reaction.
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Description
Identify the changes that occur during a chemical reaction, including changes in state, color, and evolution of gas. Test your understanding of the characteristics of chemical reactions with this quiz.
