7.1 Review CC Question Preview (ID: 46119)


Physical And Chemical Changes. TEACHERS: click here for quick copy question ID numbers.

There are several differences between chemical and purely physical changes. Which process is an example of a chemical change?
a) steam rising from a boiling pot of soup
b) a metal railing rusting in damp weather
c) alcohol evaporating from a cotton swab
d) a piece of wood shrinking as it dries out

Which process represents a chemical change?
a) A lake freezes over into ice.
b) A metal bar is rolled into a flat sheet.
c) Vinegar bubbles when baking soda is added.
d) Sand, water, and salt combine to form a mixture.

Which types of changes observe the law of conservation of mass?
a) only changes of state
b) only physical changes
c) only chemical changes
d) physical changes and chemical changes

Chemical changes result in new substances with new physical properties. Purely physical changes do not result in new substances. Which process is an example of a chemical change?
a) chopping a tree
b) cooking a steak
c) heating a cup of tea
d) drying clothes in the dryer

Which process is an example of a chemical change?
a) burning wood
b) adding salt to water
c) breaking a glass bottle
d) melting ice

Which observation is a sign of a chemical change?
a) A rotting potato gives off a bad smell.
b) A melting block of ice leaves a large puddle.
c) A cloud changes shape when blown by wind.
d) A plaster statue breaks when it falls onto the floor.

Which of the following types of changes does not observe the law of conservation of mass?
a) only physical changes
b) only nuclear changes
c) only chemical changes
d) physical changes and chemical changes

A beaker containing ice and water is placed on a warm hotplate. What type of change would you expect the ice to undergo?
a) a physical and chemical change because it will form a new substance
b) a physical and chemical change because it will change state
c) a purely physical change because it will form a new substance
d) a purely physical change because it will change state

Tearing paper into pieces is an example of what kind of change?
a) a change in mass
b) a physical change
c) a chemical change
d) a change in energy

Baking bread is an example of what kind of change?
a) physical change in form
b) physical change in state
c) chemical change
d) a nuclear change

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