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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
neutrons are equal to protons.
B
the number of protons .
C
that protons equal electrons.
D
electrons have a negative charge.
2) Why is a normal atom neutral or have no charge?
A
The neutrons, protons and electrodes are all equal.
B
It has valence electrons.
C
The electrons are equal to the neutrons.
D
The protons are equal to the electrons.
3) To understand if an atom will react or bond with another atom, I need to look at...
A
the valence electrons.
B
the total number of protons.
C
the atomic mass.
D
the number of subatomic particles in the nucleus.
4) Metals are found on the _____ side of the periodic table.
A
right
B
left
C
inside
D
zig-zag
5) An Alkali metal is most likely to bond with____.
A
a piece of tape.
B
a Noble Gas
C
a Halogen.
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 physical change
C
a balanced equation.
7) Based on the chemical formula, which of these is NOT an organic compound?
A
Ca(OH)2
B
C3H5(NO3)3
C
CaCO3
D
Na2CO3
8) How many atoms are in the formula: Ca(OH)2
A
4
B
5
C
6
D
3
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
products
C
reactants
D
gas production
11) Which of the following is an element?
A
calcium carbonate
B
O2
C
SO4
D
H2O
12) A scientist did several experiments in the lab. Which of the following is NOT a chemical reaction?
A
A gas was formed that he was able to explode.
B
The temperature of the mixed substances increased.
C
The blue liquid turned brown and stunk really bad.
D
One liquid rose to the top of the flask, and the other liquid settled to the bottom.
13) What would we look at to determine whether two atoms have similar properties?
A
the atomic number
B
their lifestyles
C
the group number
D
the period
14) Which equation is balanced?
A
2 HgO ----------- 2 Hg + O2
B
Fe2 + O2 ---------Fe2O3
C
Al + O2 --------Al2O3
D
Mg + HCl ----------- H2 + MgCl2
15) The Noble Gases do not bond or react with any atom because ...
A
they are on the right side of the periodic table.
B
they have a full outer shell.
C
they have 8 valence electrons.
D
they are exothermic.
16) This atom has 4 valence electrons and 5 energy levels.
A
Beryllium
B
Tin
C
Zirconium
D
Arsenic
17) When the temperature in a chemical reaction increases, it is ____.
A
exothermic
B
balanced
C
endothermic
18) How many elements are in the product side of this equation? CaCO3--------CaO + CO2
A
10
B
3
C
5
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
25
B
24
C
27
D
3
*select an answer for all questions
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