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 8
A student heats a blue copper sulfate crystal and observes it turns white. What does this color change indicate?
A student mixes two colorless liquids and observes a yellow color forming. What does this color change indicate?
A student mixes two solutions and the temperature of the mixture increases. What does this suggest?
A student notices a rotten egg smell after mixing two chemicals. What does this indicate?
A student heats a blue copper sulfate crystal and observes it turns white. What does this color change indicate?
A student mixes two colorless liquids and observes a yellow color forming. What does this color change indicate?
A student mixes two solutions and the temperature of the mixture increases. What does this suggest?
A student notices a rotten egg smell after mixing two chemicals. What does this indicate?
Which of the following is a chemical change?
(1) Melting butter
(2) Burning gasoline
(3) Chopping vegetables
(4) Dissolving sugar
Which of the following is a chemical change?
(1) Tearing paper
(2) Baking a cake
(3) Crushing a can
(4) Boiling water
Which of the following is a physical change, not a chemical change?
(1) Burning wood
(2) Melting ice
(3) Cooking rice
(4) Souring milk
Which of the following is a sign that a chemical change has occurred?
(1) Melting of ice
(2) Rusting of iron
(3) Boiling of water
(4) Breaking of glass
A white solid forms when two clear solutions are mixed. This solid is called a ________.
Fill in the blank: A ________ change results in the formation of one or more new substances.
Fill in the blank: The ________ of a new odor during a reaction is a sign of a chemical change.
Fill in the blank: The ________ of energy as heat or light is a common indicator of a chemical change.
Is the following statement true or false? A change in odor can be an indicator of a chemical change.
True or False: All color changes are indicators of chemical change.
True or False: The appearance of bubbles always means a chemical change has occurred.
True or False: The dissolving of salt in water is a chemical change.
