Question

Mixing of which two components thoroughly involves significant energy change ? a. Table salt and sugar b. Hydrogen and oxygen gas c. Calcium carbonate and water d. Sodium and water Q8-. Carbon and oxygen gas react to form substance carbon dioxide. Which statement about carbon dioxide is false ? a. Carbon dioxide can be classified as a pure substance b. Carbon dioxide shows the properties of both carbon and oxygen. c. Carbon dioxide is a compound of carbon and oxygen d. The reaction involves change in energy Q9-. Which of the following is not a physical change ? a. Melting of magnesium metal b. Burning of magnesium metal c. Mixing magnesium with magnesium oxide. d. Adding magnesium into kerosene oil Q10-. Which of the following change is not a chemical change ? a. Burning sodium in atmosphere of chlorine b. Dropping of sodium into water c. Cutting of sodium piece with knife d. Dropping of sodium into solution of sodium chloride in water.

Answer 1

Answer:

3. Dilute hydrochloric acid Contains only moleculer