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Chemical Reactions and Reactants Quiz

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Questions and Answers

Which of the following statements is incorrect regarding chemical reactions?

The evolution of gas and change in color are characteristics of chemical reactions.

Reactants are substances that take part in a chemical reaction.

The burning of magnesium in air is not an example of a chemical reaction. (correct)

New substances called products are formed as a result of a chemical reaction.

In the chemical reaction between zinc and dilute sulfuric acid, what is the product formed?

Neither hydrogen gas nor zinc sulfate

Both hydrogen gas and zinc sulfate (correct)

Zinc sulfate

Hydrogen gas

Why is the magnesium ribbon cleaned by rubbing with sandpaper before burning in air?

To increase the surface area of the ribbon for better burning

To remove the protective layer of basic magnesium carbonate from the surface (correct)

To make the ribbon more reactive towards oxygen in the air

To remove any impurities present on the surface of the ribbon

In the chemical reaction between citric acid and potassium permanganate solution, what change is observed?

Change in color from purple to colorless Signup and view all the answers

What is the balanced chemical equation for the reaction between sulfur dioxide gas and acidified potassium dichromate solution?

The balanced chemical equation is not provided in the text. Signup and view all the answers

What is the purpose of using dilute sulfuric acid in the reaction with zinc?

All of the above Signup and view all the answers

Which of the following statements about chemical equations is incorrect?

The arrow in a chemical equation indicates the direction of the reaction, but not the rate or extent. Signup and view all the answers

In the reaction BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq), which characteristic of a chemical reaction is exhibited?

Formation of a precipitate Signup and view all the answers

Which of the following reactions is correctly balanced according to the law of conservation of mass?

2H2 + O2 → 2H2O Signup and view all the answers

Which of the following reactions exhibits a change in temperature as a characteristic?

Both (b) and (c) Signup and view all the answers

In the chemical equation for the combustion of candle wax, which of the following statements is true?

The reactants are in the solid state, and the products are in the liquid and gaseous states. Signup and view all the answers

Which of the following is not a characteristic of a chemical reaction mentioned in the given text?

Evolution of light or energy Signup and view all the answers