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Chapter 9 Review
Test Description: Chapter 9
Instructions: Answer all questions to get your test result.
1) A metalloid
A
is made of atoms
B
is also a semiconductor
C
may conduct electric current
D
all of the above
2) Which of the following elements makes up the largest percentage of the Earth's atmophere? (~78 %)
A
Oxygen
B
Nitrogen
C
Hydrogen
D
Silicon
3) Which of the following elements makes up the majority of the Earth's Crust?
A
Hydrogen
B
Silicon
C
Nitrogen
D
Oxygen
4) Which of the following is a compound?
A
Salt water
B
Lemonade
C
Steel
D
Salt
5) Which of the following is an element?
A
NaCl
B
CO
C
KCl
D
Na
6) Which of the following is a compound?
A
Na
B
CO
C
Li
D
K
7) The elements in a compound
A
combine by reacting with one another
B
join in a specific ratio according to their masses
C
all of the above
D
can be seperated by chemical changes
8) A _______________ is a combination of two or more substances that are not chemically combined.
A
metalloid
B
element
C
compound
D
mixture
9) A ________________ is a mixture that appears to be a single substance.
A
Compound
B
Element
C
Non-metal
D
Solution
10) In solutions, the solute is the substance that is dissolved and the _____________ is the substance in which the solute is dissolved.
A
metal
B
solvent
C
elements
D
Solution
11) Concentration is
A
a measure of electrons
B
none of the above
C
a measure of elements in a compound
D
a measure of the amount of solute dissolved in a solvent (ex: amount of sugar in sweet Tea)
12) If two poisonous elements are combined chemically, which of the following will be true of the resulting compound?
A
the compound will be more poisonous than the original elements
B
the compound will be as poisonous as the original elements
C
the compound will not be poisonous
D
the compound may or may not be poisonous
13) Two different atoms are chemically combined to form a new substance. What kind of substance formed?
A
a mixture
B
an element
C
a compound
D
a solute
14) Which of the following is the symbol for Potassium?
A
K
B
P
C
Pt
D
Po
15) What group of elements on the periodic table are unreactive?
A
Alkaline Earth metals (group 2)
B
Alkali Metals (group 1)
C
Halogens (group 17)
D
Noble Gases (group 18)
*select an answer for all questions
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