Characteristics of Chemical Reactions
Chemistry ⇒ Chemical Reactions and Equations
Characteristics of Chemical Reactions starts at 7 and continues till grade 12.
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See sample questions for grade 11
A student mixes two clear solutions and observes the formation of a yellow solid. What characteristic of chemical reaction is being observed?
Describe two ways in which energy change can be observed during a chemical reaction.
Describe what is meant by the term 'precipitate' in the context of chemical reactions.
Explain why a change in color is considered a characteristic of a chemical reaction.
A student mixes two clear solutions and observes the formation of a yellow solid. What characteristic of chemical reaction is being observed?
State whether the following is a chemical or physical change: Cooking an egg.
When dilute hydrochloric acid is added to zinc granules, bubbles are observed. What does this indicate?
When silver nitrate is added to sodium chloride solution, a white precipitate is formed. Which characteristic of chemical reaction does this illustrate?
Which of the following is a characteristic of a chemical reaction?
(1) Change in taste
(2) Change in mass in a closed system
(3) Change in color
(4) Change in size
Which of the following is a sign of a chemical reaction?
(1) Dissolving sugar in water
(2) Burning of magnesium ribbon
(3) Breaking a glass
(4) Boiling water
Which of the following is an example of a chemical reaction involving evolution of gas?
(1) Heating water
(2) Mixing vinegar and baking soda
(3) Freezing juice
(4) Dissolving salt in water
Which of the following is an example of a chemical reaction with a color change?
(1) Iron rusting
(2) Melting ice
(3) Boiling water
(4) Breaking a stick
A chemical reaction is always accompanied by a ________ in energy.
During a chemical reaction, the substances that react are called ________ and the new substances formed are called ________.
Fill in the blank: The ________ of a new substance with different properties is a key characteristic of a chemical reaction.
Fill in the blank: The ________ of a precipitate during a reaction is a sign of a chemical change.
Is the following statement true or false? 'A chemical reaction always results in the formation of a new substance.'
True or False: All chemical reactions are accompanied by a visible change.
True or False: The change in state of a substance always indicates a chemical reaction.
True or False: The change in temperature during a chemical reaction can be either an increase or a decrease.
