semester 2 final review
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7.) Assuming temperature stays constant, what happens to the pressure of a gas when the volume decreases?
Answer:Pressure increases
8.) What is the relationship between pressure of a gas and number of particles?
Answer:Direct proportional
9.) What is the relationship between Celsius temperature of a gas and pressure?
Answer:Direct, but not proportional
10.) A balloon has a volume of 7.2 L and pressure of 2.0 atm. What will the new pressure be if the volume decreased to 5.0 L?
Answer:2.88 atm
12.) A gas is at 400 K with a pressure of 3.2 psi. If the temperature decreases to 200 K, what will the new pressure be?
Answer:1.6 psi
13.) As a gas is heated, what happens to the kinetic energy of the gas?
Answer:Kinetic energy increases
16.) If I have 1 mole of squirrels, how many squirrels would I have if I counted each one?
Answer:6.02 x 10^23
22.) How many moles of potassium nitrate (KNO3) are there in 300 g of potassium nitrate?
Answer:2.967 moles
24.) Classify the following reaction as a chemical or physical change, or neither.
HCl(aq) + NaHCO3(aq) NaCl(aq) + H2O(l) + CO2(g)
Answer:Chemical change
25.) What would you expect to see if you carried out the following
reaction?
NaCN (s) + HCl (aq) → NaCl (aq) + HCN (g)
Answer:Solid mixing with an aqueous solution, producing bubbles
26.) What will happen to the mass of products in this reaction?
NaCN (s) + HCl (aq) → NaCl (aq) + HCN (g)
Answer:Products weigh less, gas escapes
27.) What will happen to the mass of the products in this reaction?
AgNO3 (aq) + KCl (aq) → KNO3 (aq) + AgCl (s)
Answer:Products have same mass as reactants, no gas produced
28.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.)
CaCl2(aq) + 2NaOH(aq) Ca(OH)2(s) + 2NaCl(aq)
Answer:Double Exchange
29.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.)
CaCO3 (aq) → CaO (aq) + CO2 (g)
Answer:Decomposition
30.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.)
Cl2(g) + 2NaBr(s) → 2NaCl(s) + Br2(s)
Answer:Single Exchange
31.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.)
CO2 (g) + NaOH (aq) → NaHCO3 (aq)
Answer:Combination
32.) Which reaction below matches this verbal description?
“Liquid mercury boils to produce mercury gas”
A.) NH2Cl (g) NH2Cl (aq)
B.) H2SO4 (aq) + CaCO3 (s) CaSO4 (aq) + CO2 (g) + H2O (l)
C.) Hg (l) Hg (g)
D.) CaO (s) + H2O (l) Ca(OH)2 (s)
Answer:C.) Hg (l) Hg (g)
33.) Which reaction below matches this verbal description?
“A solution of sulfuric acid reacts with solid calcium carbonate to produce a solution of calcium sulfate, carbon dioxide and water.”
A.) NH2Cl (g) NH2Cl (aq)
B.) H2SO4 (aq) + CaCO3 (s) CaSO4 (aq) + CO2 (g) + H2O (l)
C.) Hg (l) Hg (g)
D.) CaO (s) + H2O (l) Ca(OH)2 (s)
Answer:B.) H2SO4 (aq) + CaCO3 (s) CaSO4
(aq) + CO2 (g) + H2O (l)
34.) Which reaction below matches this verbal description?
“Ammonium chloride gas is dissolved in water.”
A.) NH2Cl (g) NH2Cl (aq)
B.) H2SO4 (aq) + CaCO3 (s) CaSO4 (aq) + CO2 (g) + H2O (l)
C.) Hg (l) Hg (g)
D.) CaO (s) + H2O (l) Ca(OH)2 (s)
Answer:A.) NH2Cl (g) NH2Cl (aq)
35.) Balance the following equation:
___ Al + ___ HCl --> ___ AlCl3 + ___ H2
Answer:2 Al + 6 HCl --> 2 AlCl3 + 3 H2
37.) What is the mole ratio between potassium and potassium oxide?
4 K (s) + 1 O2 (g) 2 K2O (s)
Answer:4 moles K = 2 moles K2O
38.) What is the mole ratio between carbon dioxide and water?
2 C6H6 + 15 O2 ---> 12 CO2 + 6 H2O
Answer:12 moles CO2 = 6 moles H2O
39.) How many moles of water will be produced if 0.45 mol of oxygen reacts according to the following equation:
2 C6H6 + 15 O2 ---> 12 CO2 + 6 H2O
Answer:0.18 moles of water
40.) How many moles of carbon dioxide will be produced if 1.24 mol of C6H6 reacts according to the following equation:
2 C6H6 + 15 O2 ---> 12 CO2 + 6 H2O
Answer:7.44 moles carbon dioxide
41.) What is the molarity of a solution of 2.6 moles of sugar in 0.6 liters of solution?
Answer:4.3 M
42.) How many moles of salt (NaCl) should you dissolve if you want to make a 250 mL solution of 3.0 M NaCl?
Answer:0.75 moles of NaCl
43.) What final volume would be needed in order to prepare a 0.70 M solution from 0.15 moles of NaNO3 (s)?
Answer:0.214 L
44.) You put some drops of an unknown solution on to chunk of calcium carbonate, CaCO3. The solution fizzes and bubbles. Is it acid, base or neutral?
Answer:Acid
45.) An unknown solution is tested with universal indicator and has a pH of 10. Is it acid, base or neutral?
Answer:Base
46.) Which of the following substances have neutral pH?
A. Ca(NO3)2 B. Mg(OH)2 C. NaClD. NaOH E. HCl F. H2SO4
Answer:A and C
47.) Which of the following substances have acidic pH?
A. Ca(NO3)2 B. Mg(OH)2 C. NaClD. NaOH E. HCl F. H2SO4
Answer:E and F
48.) Which of these substances would have the highest pH?
A. 0.01 M HClB. 0.001 M NaOHC. 0.001 M NaCl
D. 0.1 M HBrE. 0.01 M KOH
Answer:E, 0.01 M KOH
49.) Which of these substances would have the lowest pH?
A. 0.01 M HClB. 0.001 M NaOHC. 0.001 M NaCl
D. 0.1 M HBrE. 0.01 M KOH
Answer:D, 0.1 M HBr
56.) What is the freezing/melting point of water in Celsius and Fahrenheit?
Answer:0 Celsius
32 Fahrenheit
57.) What is the boiling point of water in Celsius and Fahrenheit?
Answer:100 Celsius
212 Fahrenheit
61.) You have water at 43ºC. You dissolve ammonium acetate, NH4C2H4O2, in the water and find the temperature decreases to 24ºC.
What is the change in temp?Is this exo or endothermic?
Answer:-19 Celsius, endothermic
62.) Which substance requires the most energy to heat up?
A. brass = 0.09 cal/g•ºC.B. aluminum = 0.21 cal/g•ºC.C. copper = 0.12 cal/g•ºC.D. wood = 0.67 cal/g•ºC.
Answer:Wood
63.) What are the names of the seven dwarves?
Answer:Sleepy, Bashful, Happy, Grumpy,
Sneezy, Dopey, and Doc
64.) Name the first 10 elements on the periodic table without looking.
Answer:Hydrogen, Helium, Lithium, Beryllium, Boron,
Carbon, Nitrogen, Oxygen, Fluorine, Neon
65.) Name the members of the Beatles.
Answer:Paul McCartney, John Lennon, Ringo
Starr, George Harrison
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