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Chemistry
Test Description: Review for 8th grade chemistry.
Instructions: Answer all questions to get your test result.
1) To identify an atom like Chlorine, I would need to know ...
A
electrons have a negative charge.
B
the number of protons .
C
neutrons are equal to protons.
D
that protons equal electrons.
2) Why is a normal atom neutral or have no charge?
A
It has valence electrons.
B
The protons are equal to the electrons.
C
The electrons are equal to the neutrons.
D
The neutrons, protons and electrodes are all equal.
3) To understand if an atom will react or bond with another atom, I need to look at...
A
the valence electrons.
B
the number of subatomic particles in the nucleus.
C
the atomic mass.
D
the total number of protons.
4) Metals are found on the _____ side of the periodic table.
A
right
B
zig-zag
C
left
D
inside
5) An Alkali metal is most likely to bond with____.
A
a Noble Gas
B
a Halogen.
C
a piece of tape.
D
an Alkaline Earth metal.
6) When bacteria in your stomach break down starchy food into sugars, it is ________.
A
a chemical change
B
a balanced equation.
C
a physical change
7) Based on the chemical formula, which of these is NOT an organic compound?
A
Na2CO3
B
Ca(OH)2
C
CaCO3
D
C3H5(NO3)3
8) How many atoms are in the formula: Ca(OH)2
A
3
B
5
C
6
D
4
9) How many elements are in the formula: Al2(SO4)3
A
14
B
17
C
3
D
9
10) What are the beginning parts of a chemical reaction called?
A
odor change
B
gas production
C
products
D
reactants
11) Which of the following is an element?
A
H2O
B
O2
C
SO4
D
calcium carbonate
12) A scientist did several experiments in the lab. Which of the following is NOT a chemical reaction?
A
One liquid rose to the top of the flask, and the other liquid settled to the bottom.
B
A gas was formed that he was able to explode.
C
The blue liquid turned brown and stunk really bad.
D
The temperature of the mixed substances increased.
13) What would we look at to determine whether two atoms have similar properties?
A
the period
B
the group number
C
their lifestyles
D
the atomic number
14) Which equation is balanced?
A
2 HgO ----------- 2 Hg + O2
B
Al + O2 --------Al2O3
C
Mg + HCl ----------- H2 + MgCl2
D
Fe2 + O2 ---------Fe2O3
15) The Noble Gases do not bond or react with any atom because ...
A
they are exothermic.
B
they are on the right side of the periodic table.
C
they have a full outer shell.
D
they have 8 valence electrons.
16) This atom has 4 valence electrons and 5 energy levels.
A
Tin
B
Beryllium
C
Arsenic
D
Zirconium
17) When the temperature in a chemical reaction increases, it is ____.
A
balanced
B
endothermic
C
exothermic
18) How many elements are in the product side of this equation? CaCO3--------CaO + CO2
A
5
B
3
C
10
D
6
19) Which of the following is an example of a chemical reaction?
A
Grinding up a piece of meat with your teeth.
B
Opening a Cola and the gas inside rushing out.
C
The Statue of Liberty turning green as the copper rusts.
D
Taking a picture with your cell phone.
20) How many atoms are in this compound? C10H12N4O
A
24
B
27
C
3
D
25
*select an answer for all questions
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