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Chapter 9 Review
Test Description: Chapter 9
Instructions: Answer all questions to get your test result.
1) A metalloid
A
all of the above
B
is made of atoms
C
may conduct electric current
D
is also a semiconductor
2) Which of the following elements makes up the largest percentage of the Earth's atmophere? (~78 %)
A
Silicon
B
Hydrogen
C
Oxygen
D
Nitrogen
3) Which of the following elements makes up the majority of the Earth's Crust?
A
Silicon
B
Oxygen
C
Hydrogen
D
Nitrogen
4) Which of the following is a compound?
A
Steel
B
Lemonade
C
Salt
D
Salt water
5) Which of the following is an element?
A
NaCl
B
CO
C
Na
D
KCl
6) Which of the following is a compound?
A
CO
B
Li
C
K
D
Na
7) The elements in a compound
A
all of the above
B
join in a specific ratio according to their masses
C
can be seperated by chemical changes
D
combine by reacting with one another
8) A _______________ is a combination of two or more substances that are not chemically combined.
A
element
B
mixture
C
compound
D
metalloid
9) A ________________ is a mixture that appears to be a single substance.
A
Solution
B
Non-metal
C
Element
D
Compound
10) In solutions, the solute is the substance that is dissolved and the _____________ is the substance in which the solute is dissolved.
A
elements
B
solvent
C
metal
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 compound
B
an element
C
a mixture
D
a solute
14) Which of the following is the symbol for Potassium?
A
Po
B
P
C
K
D
Pt
15) What group of elements on the periodic table are unreactive?
A
Halogens (group 17)
B
Alkaline Earth metals (group 2)
C
Alkali Metals (group 1)
D
Noble Gases (group 18)
*select an answer for all questions
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