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Characteristics of a Chemical Reaction

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Questions and Answers

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?

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?

Reactant

Precipitate (correct)

Precursor

Product

What is the characteristic of a chemical reaction observed when metal reacts with acid?

<p>Evolution of hydrogen gas</p> Signup and view all the answers

What is the result of a chemical reaction that involves a change from solid to liquid or gas?

<p>Change in state</p> Signup and view all the answers

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.