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Worksheets8th Chemistry STAAR 2016
Total questions: 44
Worksheet time: 1hrs 26mins
Name
Class
Date
1.
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 the atom?
a)
48
b)
36
c)
84
d)
-36
2.
a)
A
b)
B
c)
C
d)
D
3.
a)
A
b)
B
c)
C
d)
D
4.
a)
A
b)
B
c)
C
d)
D
5.
Which information could a student determine from only the chemical formula of a protein?
a)
The color of the protein
b)
The number of molecules in each sequence that makes up a protein
c)
The physical arrangement of atoms in the structure of the protein
d)
The number of atoms of each element in the protein
6.
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
7.
5 Which of the following best describes an electron?
a)
It has no charge and about the same mass as a proton.
b)
It has a negative charge and much less mass than a proton.
c)
It has a positive charge and much more mass than a neutron.
d)
It has a negative charge and about the same mass as a neutron.
8.
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
a)
The total number of neutrons in the unknown element
b)
The total number of particles in the nucleus of the unknown element
c)
The number of protons in the nucleus of the unknown element
d)
The number of valence electrons in the unknown element
9.
**
a)
1
b)
2
c)
3
d)
4
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 scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?
a)
The baking soda and hydrochloric acid combined, and bubbles formed
b)
The baking soda absorbed the hydrochloric acid.
c)
Some of the baking soda dissolved in the hydrochloric acid
d)
The hydrochloric acid evaporated, leaving only the baking soda.
12.
**
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
13.
Which of these elements is in this group?
a)
Lithium
b)
Strontium
c)
Aluminum
d)
Silicon
14.
Which of these formulas contain equal numbers of nitrogen atoms?
a)
Formulas I and III
b)
Formulas I and IV
c)
Formulas II and III
d)
Formulas I, II, and V
15.
Aluminum, sulfur, and chlorine are elements found on the periodic table. Tests involving these three elements would show that at normal room temperature —
a)
sulfur is malleable and aluminum conducts electricity
b)
chlorine is malleable and conducts electricity
c)
aluminum is malleable and conducts electricity
d)
all three elements are malleable and conduct electricity
16.
How many atoms are represented in the reactants of this equation?
a)
6
b)
12
c)
24
d)
36
17.
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
18.
Which of the fallowing is the correct energy transfer of a toaster?
a)
Radiation-thermal-electrical.
b)
Electrical-thermal-radiation.
c)
Thermal-electrical-radiation.
d)
Electrical-radiation-thermal.
19.
How many protons does 1 atom of chlorine (Cl) have?
a)
17
b)
35
c)
7
d)
18
20.
How many electrons does 1 neutral atom of carbon (C) have?
a)
4
b)
6
c)
12
d)
18
21.
How many neutrons does 1 atom of sodium (Na) have?
a)
11
b)
12
c)
22
d)
23
22.
What is the atomic number of an atom with 13 protons, 14 neutrons, and 10 electrons?
a)
1
b)
13
c)
27
d)
37
23.
What is the mass of an atom with 7 protons, 8 neutrons, and 7 electrons?
a)
1
b)
7
c)
15
d)
22
24.
a)
F
b)
G
c)
H
d)
J
25.
a)
A
b)
B
c)
c
d)
D
26.
a)
F
b)
G
c)
H
d)
J
27.
a)
A
b)
B
c)
C
d)
D
28.
a)
F
b)
G
c)
H
d)
J
29.
a)
F
b)
G
c)
H
d)
J
30.
a)
A
b)
B
c)
C
d)
D
31.
a)
A
b)
B
c)
C
d)
D
32.
a)
A
b)
B
c)
C
d)
D
33.
a)
F
b)
G
c)
H
d)
J
34.
a)
F
b)
G
c)
H
d)
J
35.
a)
A
b)
B
c)
c
d)
D
36.
a)
60
b)
25
c)
10
d)
12
37.
a)
F
b)
G
c)
H
d)
J
38.
a)
6
b)
12
c)
4
d)
24
39.
a)
F
b)
G
c)
H
d)
J
40.
a)
F
b)
G
c)
H
d)
J
41.
a)
A
b)
B
c)
C
d)
D
42.
a)
F
b)
G
c)
H
d)
J
43.
a)
F
b)
G
c)
H
d)
J
44.
a)
A
b)
B
c)
C
d)
D
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