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 9
A student mixes two colorless solutions and observes a yellow solid forming. What indicator of chemical change is this?
A student mixes two solutions and observes a temperature drop. What does this indicate?
A student notices a rotten egg smell after mixing two chemicals. What does this indicate?
A student observes that a solution becomes cloudy after mixing two clear liquids. What indicator of chemical change is this?
A student mixes two colorless solutions and observes a yellow solid forming. What indicator of chemical change is this?
A student mixes two solutions and observes a temperature drop. What does this indicate?
A student notices a rotten egg smell after mixing two chemicals. What does this indicate?
A student observes that a solution becomes cloudy after mixing two clear liquids. What indicator of chemical change is this?
Which of the following is a chemical change?
(1) Evaporation of water
(2) Digestion of food
(3) Breaking a pencil
(4) Freezing juice
Which of the following is a chemical change?
(1) Melting of ice
(2) Burning of paper
(3) Breaking of glass
(4) Dissolving salt in water
Which of the following is a sign that a chemical change has occurred?
(1) The substance melts
(2) The substance changes color
(3) The substance is crushed
(4) The substance is stretched
Which of the following is an example of a chemical change?
(1) Freezing water
(2) Burning wood
(3) Cutting paper
(4) Boiling alcohol
A white solid forms when two clear solutions are mixed. This is an example of ________.
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 a new substance is the most important indicator of a chemical change.
Fill in the blank: The ________ of gas bubbles during a reaction is a common indicator of a chemical change.
Is the following statement true or false? A change in physical state always indicates a chemical change.
True or False: A change in odor can be an indicator of a chemical change.
True or False: All chemical changes are reversible.
True or False: The appearance of a new color in a reaction mixture is always a sign of a chemical change.
