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Ch 2
Test Description: Physical Science
Instructions: Answer all questions to get your test result.
1) The chemical element that is most abundant in the human body is
A
air
B
oxygen
C
carbon
D
nitrogen
2) A molecule of water H2O is made from____________ combining two hydrogen atoms and one oxygen atom
A
physically
B
thermally
C
chemically
D
ionically
3) You put 1 spoonful of salt into 1 Liter of water and stir. The resulting liquid is an example of a(n)
A
heterogeneous mixture
B
homogeneous mixture
C
an element
D
pure substance
4) A material that can be represented by a chemical formula is
A
an element
B
a homogeneous solution
C
a mixture
D
a pure substance
5) The chemical formula for water (H2O) means that each water molecule contains
A
one hydrogen and two oxygen atoms
B
two hydrogen and one oxygen atoms
C
two hydrogen and zero oxygen atoms
D
two hydrogen and two oxygen atoms
6) Lead has a density of 11.3 g/cm3 and a mass of 282.g. What is its volume
A
2500 cm3
B
25 cm3
C
250 cm3
D
2.5 cm3
7) Which of the following is not a potential sign of chemical change
A
production of gas
B
change of color
C
evaporation of water
D
release of gas
8) The smallest unit of an element that maintains the properties of that element is a
A
atom
B
molecule
C
compound
D
substance
9) Solids liquids, and gases are three forms of matter that
A
are made of atoms
B
have mass
C
all the answers are correct
D
take up space
10) How many atoms are in a single molecule of FE2O3
A
3
B
5
C
2
D
4
*select an answer for all questions
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