Balance each of the following equations:
____C3H8 + ____O2 → ____CO2 + ____H2O
____C5H12 + ____O2 → ____CO2 + ____H2O
____C4H10 + ____O2 → ____CO2 + ____H2O
____C2H2 + ____O2 → ____CO2 + ____H2O
Review Problem
A compound is found to be composed of 40.0% carbon by mass, 6.7% hydrogen by mass, with the remainder being oxygen.
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What is the empirical formula of the compound?
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The molar mass is estimated at 180 g/mol. What is the molecular formula of the compound?
Reaction Problem
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Chlorine gas is bubbled through an aqueous solution of potassium bromide.
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What other halogens could perform the same role as chlorine in this reaction?
Draw electron dot notations for the following elements:
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potassium (K)
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fluorine (F)
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carbon (C)
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phosphorus (P)
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selenium (Se)
1. Place the following elements in order from largest radius to smallest radius.
beryllium, strontium, barium, calcium, magnesium
2. Place the elements above in order from the largest ionization energy to the smallest ionization energy
Review Problem
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Describe the process for producing 500.0 mL of 1.5 M H2SO4 aqueous solution from concentrated sulfuric acid (98%, or 18.4 M).
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Do you add water to the concentrated acid, or concentrated acid to water? Why?
Match the elements at right with the element class to which they belong on the left.
Class:
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Halogen
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Nonmetal
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Transition metal
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Alkali metal
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Noble gas
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Alkaline Earth metal
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Metalloid (Semimetal)
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Argon (#18)
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Palladium (#46)
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Phosphorus (#15)
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Potassium (#19)
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Arsenic (#33)
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Strontium (#38)
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Iodine (#53)
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Titanium (#22)
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Reaction Problem
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Solid potassium hydroxide is added to a solution of nitric acid
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Would you expect the process to be endothermic or exothermic?
Review Problem
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A 5.00 gram piece of dry ice (CO2) is placed in a sealed 10.0 L container at a temperature of 25°C and allowed to sublime. If the pressure before sublimation was 1.01 atm (due to the air in container), what is the final pressure in the container after sublimation, assuming the temperature remains constant?
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Why is it most unlikely that the temperature inside the container remains constant during sublimation? Should the final temperature be higher or lower than the initial temperature of 25°C?
Match the descriptors at left with the appropriate particle(s) on the right.
Descriptors:
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Mass# = 1
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Mass# = 0
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Positive
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Negative
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Neutral
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found in the nucleus
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found outside the nucleus
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Electron
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Proton
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Neutron
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