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Worksheets8th STAAR review Matter and Energy
Total questions: 11
Worksheet time: 15mins
Name
Class
Date
1.
A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?
a)
The number of protons
b)
The number of neutrons
c)
The location of valence electrons
d)
The number of valence electrons
2.
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
a)
Nitrogen (N)
b)
Sulfur (S)
c)
Arsenic (As)
d)
Silicon (Si)
3.
*
a)
Boron (B)
b)
Carbon (C)
c)
Neon (Ne)
d)
Sodium (Na)
4.
*
a)
12CO2 + H20 --light--> C6H12O6 + O2
b)
CO2 + 9H20 --light--> C6H12O6 + O2
c)
CO2 + H20 --light--> 3C6H12O6 + O2
d)
6CO2 + 6H20 --light--> C6H12O6 + 6O2
5.
Hay is made up of organic compounds. What are the main elements in many organic compounds?
a)
Helium, Carbon, Sodium
b)
Sodium, Hydrogen, Nitrogen
c)
Carbon, Hydrogen, Oxygen
d)
Radon, Oxygen, Helium
6.
**
a)
CO
b)
H2O
c)
CO2
d)
H2
7.
**
a)
one of the original compounds came out of solution
b)
the solutions reacted chemically
c)
some of the water froze into ice crystas
d)
rapid evaporation of water occurred, leaving a solid
8.
What describes the ability of a solid to dissolve in water?
a)
melt
b)
dissapear
c)
solubility
d)
evaporate
9.
An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?
a)
48
b)
36
c)
84
d)
120
10.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
a)
+25
b)
+30
c)
-25
d)
-30
11.
A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?
a)
The number of protons
b)
The number of neutrons
c)
The location of valence electrons
d)
The number of valence electrons
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