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Chemistry 1st semester Review
1. Which of these changes in rocks is a physical change?
a. Acid rain damaging marble
b. Iron in rock combining with oxygen to form hematite
c. Carbonic acid weathering limestone
d. An ice wedge shattering a slab of shale
2. Which of these describes a pollution-producing process that involves only a physical change?
a. Coal with high sulfur content is burned, producing gases that cause acid rain.
b. Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen.
c. t wastewater is discharged into a lake, lowering oxygen levels in the water.
d. Nitrogen oxide emissions combine with water vapor, producing nitric acid.
3. Which of the following involves a chemical change?
a. Snow melting into water.
b. An apple rotting on a tree.
c. Beating egg whites until they thicken.
d. Condensation.
4. Which of the following is an example of a physical change?
a. Toasting bread
b. Boiling water
c. Cooking a hamburger
d. Digesting a banana
5. Which of the following groups contains members with similar chemical reactivity?
a. Li, Be, C
b. Be, Mg, Sr
c. Sc, Y, Zr
d. C, N, O
6. An unidentified element has many of the same physical and chemical properties as magnesium and strontium
but has a lower atomic mass than either of these elements. What is the most likely identity of this element?
a. Sodium
b. Beryllium
c. Calcium
9
10
d. Rubidium
7. Look at the following block of elements as they appear on the periodic table:
Which two elements would have the most similar chemical properties?
a. Fluorine and chlorine.
b. Fluorine and neon.
c. Fluorine and argon.
d. Chlorine and neon.
8. Iron (III) chloride + Sodium carbonate  Iron (III) carbonate + Sodium chloride
Which of these is the balanced equation for the reaction described above?
a. FeCl3 + Na2CO3  Fe2(CO3)3 + NaCl.
b. 2 FeCl3 + 3 Na2CO3  Fe2(CO3)3 + 6 NaCl.
c. 2 FeCl3 + 2 Na2CO3 + 3 Fe2(CO3)3 + 3 NaCl.
d. 3 FeCl3 + 2 Na2CO3  3 Fe2(CO3)3 + 6 NaCl.
9. Which best represents the reaction between sulfuric acid & calcium hydroxide?
a. H2SO4 + Ca(OH)2  CaSO4 + H2O.
b. H2SO4 + Ca(OH)2  CaSO4 + 2 H2O.
c. H2SO4 + CaOH  CaSO4 + H2O.
d. H2SO4 + Ca(OH)2  2 CaSO4 + 3 H2O.
F
Fluorine
Ne
Neon
17
Cl
Chlorine
18
Ar
Argon
10. In chemistry class, Mr. Smoak adds a small piece of sodium metal to a glass of water. The sodium reacts
violently with the water accompanied by a small flame. The end products are hydrogen gas and aqueous sodium
hydroxide. Which of the following is the correct balanced chemical equation for the reaction described above?
a. 2 Na + 2 H2O  2 NaOH + H2.
b. Na + H2O + O2  3 NaOH + H2.
c. H2O2 + 2 Na  2 NaOH + H2.
d. 2 NaOH + H2  2 Na + 2 H2O.
11. When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, no copper or oxygen is left over.
How much copper (II) oxide is produced?
a. 32 g
b. 95 g
c. 127 g
d. 159 g
12. According to the law of conservation of mass, how much zinc was present in the zinc carbonate?
a. 40 g
b. 88 g
c. 104 g
d. 256 g
13. Which additional product balances this reaction?
a. 4 OH
b. CH4
2 C2H2 + 5 O2 
c. H2O2
d. 2 H2O
4 CO2 + ___
14.Which of the following represents a balanced chemical equation?
a. 2 HCl + NaOH  H2O + NaCl.
b. C2H2 + O2  2 CO2 + H2O.
c. Na + H2O  NaOH + H2.
d. 6 CO2 + 6 H2O  C6H12O6 + 6 O2.
15.Which of the following equations is balanced?
a. H2SO4 + 2 NaOH  Na2SO4 + H2O.
b. CH4 + Cl2  CH2Cl2 + HCl.
c. H2O + MgO  Mg(OH)2.
d. Al(OH)3 + H3PO4  AlPO4 + 2 H2O.
16.___AlCl3 + ___Ba(OH)2  ___Al(OH)3 + ___BaCl2 When this equation is correctly balanced, the coefficient of
the AlCl3 will be…
a. 1
b. 2
c. 4
d. 6
17. What is the coefficient for H2O when the equation is balanced?
a. 1
b. 2
K + H2O → KOH + H2
c. 3
d. 4
18. A student needs to measure exactly 42.5 ml of an acid. Which of the following pieces of laboratory equipment
would be best for her to use?
a. 10 mL graduated cylinder.
b. 5 mL pipette.
c. 50 ml graduated cylinder.
d. 250 mL Erlenmeyer flask.
19. This pipette is filled with a 20% NaOH solution. The solution is at
20°C and has a density of 1.23 g/mL. According to this information,
what is the mass of this NaOH solution?
a. 3.88 g
b. 15.7 g
c. 23.9 g
d. 24.6 g
20. Which of the following pieces of equipment would be most appropriate for measuring the volume of a marble?
21. Which question can not be answered by an experiment?
a. Does penicillin kill salmonella bacteria?
b. Is rabies caused by a virus?
c. Did the impact of a comet kill the dinosaurs?
d. Can radiation cause cancer?
22. Two science students discovered that the mass of a sample of acetone in an open crucible decreased within a
few minutes. One student hypothesized that the acetone reacted with oxygen to form a gaseous compound that
escaped. The other student believed that the acetone evaporated into the air. What should the students do to test
these hypotheses?
a. Combine the hypotheses so they give valid predictions of the acetone’s intensive properties
b. Conduct a study of original papers describing the experiments leading to acetone’s discovery
c. Perform an experiment that attempts to identify the gas above the open crucible
d. Ask a classmate’s opinion about the chemical and physical properties of acetone
23. A study was conducted to test the effectiveness of hearing aids. People with different types of hearing loss
were included in the study. Which question would help in determining whether the conclusion above is valid?
a. What was the most common occupation of people in the study?
b. What was the average age of the people in the study?
c. How many people were included in the study?
d. How many people in the study had vision problems?
24. Tim conducted a study of green algae in a nearby lake and noted that algae could not be found more than 1 m
below the surface of the lake on cloudy or partly cloudy days. On sunny days, he noticed that algae could be found
up to 3 m below the surface of the lake. What might Tim conclude concerning the depth of algae growth?
a. Depth of algae growth is affected by humidity.
b. Depth of algae growth is affected by wind speed.
c. Depth of algae growth is affected by the pH of the lake water.
d. Depth of algae growth is affected by the amount of sunlight.
25. Calcium hydroxide
a. Ca(OH)2
b. CaHO2
c. CaOH2
d. Ca2(OH)
26. Ammonium sulfate
a. (NH4)2SO4
b. Al2(SO4)3
c. Al(SO4)3
d. NH4SO4
27. Manganese (II) phosphide
a. Mn2P3
b. Mn3P2
c. MnP
d. Mg3P2
28. Barium oxide
a. BaO
b. B2O3
c. Ba2O2
d. B3O2
29. Dicarbon hexafluoride
a. C6F2
b. C2F6
c. C33F
d. 2C6F3
30. According to this information, what is the chemical formula for aluminum sulfate?
a. AlSO4
b. Al2(SO4)3
c. Al3(SO4)2
d. Al6SO4
31. According to the periodic table, which element most readily accepts electrons?
a. Fluorine
b. Nitrogen
c. Arsenic
d. Aluminum
32. Look at the following block of atoms as found in the periodic table:
Which element shown would be the most reactive?
a. Sodium.
b. Potassium.
c. Magnesium.
d. Calcium
33. Which of the following atoms would expect to have largest atomic radius?
a. Li.
b. K.
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Na
Sodium
22.9898
12
Mg
Magnesium
24.305
19
K
Potassium
39.0983
20
Ca
Calcium
40.08
c. Na.
d. Cs.
34. In which of the following pairs is the element not paired with the correct family?
a. Alkali Metals – Cesium
b. Alkaline Earth Metals – Barium
c. Halogens – Sulfur
d. Noble Gases – Krypton
35. According to the periodic table and the table, which element has this electron configuration?
a. Sodium
b. Neon
Electron Configuration
c. Magnesium
Energy Level
1 2 3
d. Argon
Electrons
2 8 8
36. What is the electron configuration of Mg?
a. 1s22s22p63s2
b. 1s22s22p63s1
c. 1s22s22p63s23p2
d. 1s22s22p23s2
37. The element that has the electron configuration of 1s2 2s2 2p5 is a/an ?
a. Alkali metal
b. Alkaline earth metal
c. Noble gas
d. Halogen
38. Which procedure is best to use when determining the density of a rock?
a. Place the rock in a water-filled beaker and find the height at which the rock floats above the water.
b. Use a ruler to measure the rock’s dimensions and then convert its mass using an analytical balance.
c. Find the mass of the rock on a balance & then find the volume of water it displaces in a graduated cylinder.
d. Place the rock in three liquids with different known densities and observe which liquid the rock floats in.
Read the following measurements using the proper number of significant figures:
39.
a. 37.50 mL
b. 35.0 mL
c. 36.5 mL
d. 36.50 mL
Match the nuclear equation with the correct name of the reaction:
U
40. _____ Fission
a.
238
92
41._____ Beta decay
b.
14
42. _____ Alpha decay
c.
1
43. _____ Fusion
d.
1
0
Th  24He
234
90
C  14N 
0
1
e
H  2H  4He  01n  
n
U
235
92
Kr 
91
36
Ba  301 n
142
56