Podcast
Questions and Answers
Which of the following statements is incorrect regarding chemical reactions?
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?
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?
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?
In the chemical reaction between citric acid and potassium permanganate solution, what change is observed?
What is the balanced chemical equation for the reaction between sulfur dioxide gas and acidified potassium dichromate solution?
What is the balanced chemical equation for the reaction between sulfur dioxide gas and acidified potassium dichromate solution?
What is the purpose of using dilute sulfuric acid in the reaction with zinc?
What is the purpose of using dilute sulfuric acid in the reaction with zinc?
Which of the following statements about chemical equations is incorrect?
Which of the following statements about chemical equations is incorrect?
In the reaction BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq), which characteristic of a chemical reaction is exhibited?
In the reaction BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq), which characteristic of a chemical reaction is exhibited?
Which of the following reactions is correctly balanced according to the law of conservation of mass?
Which of the following reactions is correctly balanced according to the law of conservation of mass?
Which of the following reactions exhibits a change in temperature as a characteristic?
Which of the following reactions exhibits a change in temperature as a characteristic?
In the chemical equation for the combustion of candle wax, which of the following statements is true?
In the chemical equation for the combustion of candle wax, which of the following statements is true?
Which of the following is not a characteristic of a chemical reaction mentioned in the given text?
Which of the following is not a characteristic of a chemical reaction mentioned in the given text?
