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?
Describe how the change in energy during a chemical reaction can be detected.
Describe two indicators that a chemical change has occurred when magnesium ribbon is burned in air.
Explain why a change in temperature can be considered an indicator of a chemical change.
Explain why dissolving salt in water is not considered a chemical change.
Explain why the rusting of iron is considered a chemical change.
When vinegar is added to baking soda, bubbles are observed. What does this indicate about the reaction?
A student mixes aqueous solutions of barium chloride and sodium sulfate. After a few seconds, a white solid forms and settles at the bottom of the beaker. Which indicator of chemical change is demonstrated in this experiment?
A student observes that when two colorless solutions are mixed, the resulting solution turns bright blue. What does this observation suggest about the type of change that has occurred?
During a reaction, a student observes that the reaction vessel becomes cold to the touch. What type of energy change does this indicate, and how does it relate to chemical change?
Explain why the formation of bubbles when magnesium reacts with dilute sulfuric acid is considered a chemical change, but the formation of bubbles when water boils is not.
When a solution of potassium permanganate is added to an acidified solution of oxalic acid, the purple color of permanganate gradually disappears. Explain which indicator(s) of chemical change are observed in this reaction and the underlying chemical process.
