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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
nitrogen
B
air
C
carbon
D
oxygen
2) A molecule of water H2O is made from____________ combining two hydrogen atoms and one oxygen atom
A
chemically
B
physically
C
thermally
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
an element
C
homogeneous mixture
D
pure substance
4) A material that can be represented by a chemical formula is
A
an element
B
a mixture
C
a homogeneous solution
D
a pure substance
5) The chemical formula for water (H2O) means that each water molecule contains
A
two hydrogen and zero oxygen atoms
B
two hydrogen and one oxygen atoms
C
one hydrogen and two 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
2.5 cm3
B
2500 cm3
C
250 cm3
D
25 cm3
7) Which of the following is not a potential sign of chemical change
A
release of gas
B
change of color
C
production of gas
D
evaporation of water
8) The smallest unit of an element that maintains the properties of that element is a
A
atom
B
compound
C
substance
D
molecule
9) Solids liquids, and gases are three forms of matter that
A
take up space
B
are made of atoms
C
have mass
D
all the answers are correct
10) How many atoms are in a single molecule of FE2O3
A
4
B
3
C
5
D
2
*select an answer for all questions
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