Indicators of Chemical Change
Chemistry ⇒ Chemical Reactions and Equations
Indicators of Chemical Change starts at 7 and continues till grade 12.
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See sample questions for grade 11
A student adds dilute hydrochloric acid to a piece of marble and observes fizzing. What does this observation indicate?
A student mixes two clear solutions and observes a yellow solid forming. What indicator of chemical change is this?
A student notices a strong smell when ammonia solution is mixed with hydrochloric acid. What does this indicate?
A student observes that the temperature of a solution increases when two chemicals are mixed. What type of reaction is this and what does it indicate?
A student adds dilute hydrochloric acid to a piece of marble and observes fizzing. What does this observation indicate?
A student mixes two clear solutions and observes a yellow solid forming. What indicator of chemical change is this?
A student notices a strong smell when ammonia solution is mixed with hydrochloric acid. What does this indicate?
A student observes that the temperature of a solution increases when two chemicals are mixed. What type of reaction is this and what does it indicate?
Which of the following is a sign that a chemical change has occurred?
(1) A solid dissolves in water
(2) A new substance with different properties forms
(3) A liquid evaporates
(4) A solid melts
Which of the following is an example of a chemical change indicated by a change in odor?
(1) Souring of milk
(2) Freezing of water
(3) Breaking of glass
(4) Dissolving salt in water
Which of the following is an example of a chemical change indicated by the evolution of gas?
(1) Dissolving sugar in tea
(2) Adding vinegar to baking soda
(3) Freezing water
(4) Melting butter
Which of the following is an indicator of a chemical change?
(1) Change in size
(2) Change in temperature
(3) Change in position
(4) Change in pressure
A white solid forms when solutions of silver nitrate and sodium chloride are mixed. The formation of the white solid is an example of ________.
Fill in the blank: The ________ of milk is an example of a chemical change indicated by a change in odor and texture.
Fill in the blank: The change in ________ is often observed when copper reacts with moist air to form a green layer.
Fill in the blank: The evolution of ________ is observed when zinc reacts with hydrochloric acid.
True or False: All chemical changes are accompanied by a visible color change.
True or False: All chemical changes are irreversible.
True or False: The appearance of bubbles during a reaction always indicates a chemical change.
True or False: The formation of a precipitate always means a chemical change has occurred.
