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 difference between a physical change and a chemical change.
Describe what is meant by 'evolution of gas' in a chemical reaction.
Describe what is meant by the term 'precipitate' in the context of chemical reactions.
During a chemical reaction, the total mass of reactants and products remains constant. This is an example of which law?
When a solution of lead(II) nitrate is mixed with potassium iodide, a yellow precipitate forms. What does this indicate?
When dilute hydrochloric acid is added to zinc granules, bubbles are observed. What do these bubbles indicate?
When two clear solutions are mixed and a yellow solid forms, what characteristic of chemical reactions does this demonstrate?
When vinegar is added to baking soda, a fizzing sound is heard and bubbles are seen. What does this indicate about the reaction?
Which of the following is a characteristic of a chemical reaction?
(1) Change in mass
(2) Change in energy
(3) Change in volume
(4) Change in pressure
Which of the following is a characteristic of a chemical reaction?
(1) Change in taste
(2) Change in size
(3) Change in texture
(4) Change in position
Which of the following is a chemical change?
(1) Evaporation of water
(2) Fermentation of sugar
(3) Sublimation of iodine
(4) Freezing of milk
Which of the following is a chemical change?
(1) Freezing of water
(2) Burning of paper
(3) Breaking a stick
(4) Dissolving salt in water
A change in color during a reaction indicates ________.
Fill in the blank: The ________ of a gas during a reaction is a sign that a chemical change has occurred.
Fill in the blank: The ________ of heat during a reaction is a sign that a chemical change has occurred.
Fill in the blank: The appearance of a ________ during a reaction between two solutions is evidence of a chemical reaction.
Is the souring of milk a chemical reaction? Yes or No.
State whether the following statement is 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 change in temperature.
True or False: All chemical reactions are irreversible.
