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 10
A student mixes two clear solutions and observes a yellow solid forming. What indicator of chemical change is this?
A student observes a color change from blue to green when two solutions are mixed. What does this indicate?
Describe one example of a chemical change that involves the evolution of gas.
Describe two indicators that a chemical change has occurred when iron rusts.
Explain why a change in temperature can be considered an indicator of a chemical change.
Explain why the burning of magnesium ribbon produces a bright white light and a white powder as indicators of a chemical change.
Explain why the souring of milk is considered a chemical change.
When vinegar is added to baking soda, bubbles are observed. What does this indicate about the reaction?
A student adds a few drops of phenolphthalein to a colorless solution and observes that the solution turns pink. Which indicator of chemical change does this observation represent?
A student observes that when two colorless solutions are mixed, the temperature of the mixture drops significantly and a white solid forms. Which two indicators of chemical change are present in this scenario?
Describe how you would experimentally determine whether a change in temperature observed during a reaction is due to a chemical change or a physical change. Provide an example to support your explanation.
During a laboratory experiment, a student mixes hydrochloric acid with zinc granules and notices a rapid increase in temperature, the evolution of a colorless gas, and the disappearance of the zinc. Explain which indicators of chemical change are present in this reaction and justify your answer.
Explain why the reaction between lead(II) nitrate and potassium iodide, which produces a bright yellow solid, is considered a chemical change. Identify the indicator(s) of chemical change in this reaction.
