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Physical Science Notes 416-436
Review Questions


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Chemical and Physical Changes and properties
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Test your skills that youve learnt on this site and in class on these review questions

1)      In the laboratory, you are given samples of three different liquids. One of these samples is an acidic solution.

What should you do to identify the acidic solution?


A)    Observe the colour of each liquid.

B)     Perform the litmus paper test on each liquid

C)    Find the mass of 5ml of each liquid

D)    Perform the cobalt chloride paper test


2)      To find the density of a solid, a student measured its mass and then determined its volume by the displacement of water.

The results of his measurements are given in the table below.




Water + Solid





What is the density of this solid?


A)    0.36 g/ml

B)     0.64 g/ml

C)    2.8 g/ml

D)    4.4 g/ml


3)      Which one of the following statements about an unknown substance indicates clearly that this substance is a compound?


A)    It has a high density.

B)     When this substance is heated, its colour changes.

C)    This substance does not dissolve in water.

D)    This substance was formed by the reaction of oxygen gas and magnesium.


4)      Which one of the following phenomena is the result of a physical change?


A)    Milk left on the counter turns sour.

B)     A hammer left outside rusts.

C)    A forest burns out of control.

D)    A pond freezes over.


5)      Two isotopes of chlorine are found in nature.

What is the difference between these two isotopes?


A)    The number of electrons

B)     The number of protons

C)    The number of neutrons

D)    The number of electron orbits (energy levels)

6)      Working in a laboratory, a student heated a solid in an open test tube and made the following observations.


Solid before it was heated

Solid after it was heated







Electrical conductivity

Does not conduct electricity

Does not conduct electricity





Which of the following statements is true with regard to the solid after it was heated?


A)    Is it an element because the mass has increased.

B)     Is it an element because the colour has changed.

C)    Is it a compound because the mass has increased.

D)    Is it a compound because the colour has changed


7)      The following are four characteristics of Daltons atomic model:

-An atom is indivisible.

-Atoms of the same element are identical.

-Atoms of different elements are different.

-Atoms can be rearranged to produce new substances.


Which one of the following facts can be explained by means of Daltons atomic model?


A)    Water is formed from hydrogen gas and oxygen gas.

B)     Electrons are located around the nucleus.

C)    The nucleus is located at the centre of an atom.

D)    Static electricity is found in nature.


8)      Four elements from the periodic table are described below.

Element 1

This element from Period 2 has two more electrons than helium.

Element 2

This soft metal from Period 3 has one valance electron and reacts vigorously with water.

Element 3

This element from Period 4 is found in bones and teeth.

Element 4

This element from Period 3 has some of the properties of metals and nonmetals.


Which of these elements belong to the same group or chemical family?


A)    1 and 2                                     C) 2 and 4

B)     1and 3                                      D) 3 and 4

All questions were taken from a review package provided by the physical science teacher who supervised the site