Read and understand each question properly. Encircle the letter of the
correct answer.
1. Why do we consider cooking as a chemical change?
a. Because there is a change in size
b. Because the food changes its shape
c. Because a new substance is produced
d. Because heat was added in the process
2. Which of the following situations shows physical change?
a. A straight piece of wire is coiled to form a spring.
b. You take out your best silver spoons and notice that they are very dull
and have some black spots.
c. Your friend decides to toast a piece of bread but leaves it in the toaster
too long. The bread is black and the kitchen is full of smoke.
d. In baking biscuits and other quick pieces of bread, the baking powder
reacts to release carbon dioxide bubbles. The carbon dioxide bubbles
cause the dough to rise.
3. Which of the following describes chemical change?
a. A new product is formed
b. Formation of bubbles in the material
c. Alters the form of a substance, but does not change it to another
substanced. All of the above
4. Which of the following is an example of a chemical change?
a. Filling up a balloon with hot air.
b. Your dog ripping up your homework.
c. A plant collecting sunlight and turning it into food.
d. Taking a glass of water and freezing it in the freezer.
5. Burning of matches is an example of _______________.
a. Chemical change
b. Chemical property
c. Physical change
d. Physical property