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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Describe the role of energy in a chemical reaction.
Describe what is meant by 'irreversibility' as a characteristic of some chemical reactions.
Describe what is meant by the evolution of gas as a characteristic of a chemical reaction.
Describe what is meant by the term 'chemical change'.
The burning of magnesium ribbon in air produces a bright white light and a white powder. Which characteristics of chemical reactions are shown in this example?
When iron reacts with sulfur to form iron sulfide, what characteristic of chemical reaction is observed?
When silver nitrate is added to sodium chloride solution, a white solid forms. What does this indicate?
When two solutions are mixed and a solid forms, what is this solid called?
Which of the following is a characteristic of a chemical reaction?
(1) Change in mass only
(2) Change in energy
(3) Change in size only
(4) Change in position only
Which of the following is a characteristic of a chemical reaction?
(1) Change in shape
(2) Change in energy
(3) Change in size
(4) Change in position
Which of the following is a chemical change?
(1) Freezing of water
(2) Burning of paper
(3) Cutting of wood
(4) Dissolving salt in water
Which of the following is a sign of a chemical reaction?
(1) Boiling of water
(2) Dissolving sugar in water
(3) Formation of bubbles when vinegar is added to baking soda
(4) Breaking a glass
A change in color during a reaction is an indication of a ________.
During a chemical reaction, the substances that react are called ________ and the new substances formed are called ________.
Fill in the blank: A chemical reaction may be accompanied by a change in ________, such as heat, light, or sound.
Fill in the blank: The formation of a ________ indicates the formation of an insoluble product in a chemical reaction.
Is the following statement true or false? 'A change in temperature is always a sign of a chemical reaction.'
Is the following statement true or false? 'A chemical reaction always produces a gas.'
Is the following statement true or false? 'A chemical reaction can occur without any visible change.'
Is the following statement true or false? 'A chemical reaction may involve a change in energy.'
