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WorksheetsIntro Chemistry - All RC1 SEs
Total questions: 27
Worksheet time: 14mins
Name
Class
Date
1.
6.5C
The chemical equation shown represents a reactions that produces fuel for certain cars. Which substance represented in this equation is classified as an element?
The chemical equation shown represents a reactions that produces fuel for certain cars. Which substance represented in this equation is classified as an element?
a)
CO
b)
H20
c)
CO2
d)
H2
2.
6.5C
Some students are using samples of different substances for a lab investigation. They plan to observe the physical properties of each substance and record their observations in a table like the one shown. Which of these substances are elements?
Some students are using samples of different substances for a lab investigation. They plan to observe the physical properties of each substance and record their observations in a table like the one shown. Which of these substances are elements?
a)
S, Fe, O2, Sr, and Al
b)
S, O2, and LiF
c)
N2, O4, O2, and LiF
d)
N2, O4, Fe, Sr, and Al
3.
6.6A
Some students conducted a lab investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table shown. Which sample is most likely a non metal?
Some students conducted a lab investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table shown. Which sample is most likely a non metal?
a)
Sample 1
b)
Sample 2
c)
Sample 3
d)
Sample 4
4.
6.6A
Aluminum, Sulfur, and Chlorine are elements found on the Periodic Table. Tests involving these three elements would show that at normal room temperature -
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 of the above
5.
6.6BA balance and a graduated cylinder are used to detemine the density of a mineral sample. The sample has a mass of 14.7g and a volume of 2.2cm3. What is the density of the mineral sample? (Hint: Use the resource sheet and a calculator)
a)
0.15 g/cm3
b)
32 g/cm3
c)
13 g/cm3
d)
6.7 g/cm3
6.
6.6B
Which unknown substance is most likely MAGNESIUM?
Which unknown substance is most likely MAGNESIUM?
a)
substance 1
b)
substance 2
c)
substance 3
d)
substance 4
7.
7.6A
Based on its chemical formula, which of the following substances is an organic compound?
Based on its chemical formula, which of the following substances is an organic compound?
a)
Urea, CH4N2O
b)
Ammonium Sulfide, (NH4)2S
c)
Silane, SiH4
d)
Sodium Chloride, NaCl
8.
7.6A
a)
Student K
b)
Student L
c)
Student M
d)
Student N
9.
7.6B
Many processes occur in the digestive system. Which process is best classified as a PHYSICAL change?
Many processes occur in the digestive system. Which process is best classified as a PHYSICAL change?
a)
saliva converting the starch molecules in crackers into simple sugars
b)
digestive enzymes breaking down proteins into smaller fragments
c)
bacteria converting lactose into simple sugars in the intestines
d)
teeth grinding an almond into smaller pieces in the mouth
10.
8.5A
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's NUCLEUS?
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's NUCLEUS?
a)
-25
b)
+25
c)
-30
d)
+30
11.
8.5A
What is the mass number of a potassium(K) atom that has 20 neutrons?
What is the mass number of a potassium(K) atom that has 20 neutrons?
a)
18
b)
19
c)
20
d)
39
12.
8.5A
Which of the following best describes an electron?
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
13.
8.5B
An atom of which element is represented by this model?
An atom of which element is represented by this model?
a)
Boron
b)
Carbon
c)
Neon
d)
Sodium
14.
8.5B
A student is studying Calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?
A student is studying Calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?
a)
the 20 protons in each atom of calcium
b)
the density of calcium, which is 1.54g/cm3
c)
the atomic mass of calcium, which is 40.078amu
d)
the 2 valence electrons in each atom of calcium
15.
8.5B
a)
Radon (Rn)
b)
Cadmium (Cd)
c)
Rubidium (Rb)
d)
Astatine (At)
16.
8.5B
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 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)
17.
8.5C
Which two atoms are of elements in the same group in the periodic table?
Which two atoms are of elements in the same group in the periodic table?
a)
Atoms 1 and 2
b)
Atoms 1 and 3
c)
Atoms 1 and 4
d)
none of these atoms are in the same group
18.
8.5C
Which two elements on the periodic table are in the same period?
Which two elements on the periodic table are in the same period?
a)
Sn and Rb
b)
F and Cl
c)
K and Ba
d)
Se and Te
19.
8.5D
Which of these formulas contain equal numbers of oxygen atoms? (HINT: add up the total number of oxygen atoms for each formula and write it down next to the formula)
Which of these formulas contain equal numbers of oxygen atoms? (HINT: add up the total number of oxygen atoms for each formula and write it down next to the formula)
a)
I & IV
b)
II & V
c)
I, II, and V
d)
I, II, IV, V
20.
8.5D
The equation shown represents a chemical reactions that occurs in living cells. How many atoms are represented in the PRODUCTS of this equation?
The equation shown represents a chemical reactions that occurs in living cells. How many atoms are represented in the PRODUCTS of this equation?
a)
6
b)
12
c)
24
d)
36
21.
8.5D
In which of these two compounds are there twice as many hydrogen atoms as there are oxygen atoms?
In which of these two compounds are there twice as many hydrogen atoms as there are oxygen atoms?
a)
H4PO2
b)
H2SO4
c)
H3ClO5
d)
H2O2
22.
8.5E
During an investigation, a student combined the two clear, colorless solutions shown. The student observed that the temperature changed when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
During an investigation, a student combined the two clear, colorless solutions shown. The student observed that the temperature changed when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
a)
One of the original compounds came out of a solution
b)
the solutions reacted chemically
c)
some of the water froze into ice crystals
d)
rapid evaporation of water occurred, leaving a solid
23.
8.5E
A scientist performed four investigations using 8 different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table shown. In which investigation is it LEAST likely that the liquids reacted chemically?
A scientist performed four investigations using 8 different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table shown. In which investigation is it LEAST likely that the liquids reacted chemically?
a)
1
b)
2
c)
3
d)
4
24.
8.5E
The student inferred that a chemical reaction occurred. What evidence supports this inference?
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
a dark solid formed on the zinc metal
b)
the zinc metal remained silver-colored and shiny
c)
the CuSO4
d)
None of these
25.
8.5F
a)
F
b)
G
c)
H
d)
J
26.
8.5F
Which of these is a BALANCED equation for photosynthesis?
Which of these is a BALANCED equation for photosynthesis?
a)
A
b)
B
c)
C
d)
D
27.
8.5F
A chemical reaction in which calcium carbonate, CaCO3 is decomposed results in the production of two simpler compounds. What mass of calcium carbonate is decomposed in this reaction?
A chemical reaction in which calcium carbonate, CaCO3 is decomposed results in the production of two simpler compounds. What mass of calcium carbonate is decomposed in this reaction?
a)
6.03g
b)
49.97g
c)
21.97g
d)
28.00
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