Answer Options:
lustrous, malleable, forms cations
semiconductors
shiny, brittle, insulating
None of these describe metals.
Answer: lustrous, malleable, forms cations
Question: A dialysis unit requires 70000 mL of distilled water. How many gallons of water are needed? (Use these conversions: 1 gal = 3.7854 L, 1 L = 1000 mL)
Answer Options:
Answer: 18.474
Question: A chemist mixes sodium and water and witnesses a violent reaction between the two substances. This is best classified as an:
Answer Options:
theory
law
hypothesis
observation
Answer: observation
Question: Which of the following is a common characteristic of nonmetals?
Answer Options:
Answer: low melting point
Question: 9.31 g is the same mass as _____.
Answer Options:
Answer: 9310 mg
Question: A solution has a density of 1.22 g/mL. What volume of the solution has a mass of 48.2 g?
Answer Options:
Answer: 39.5 mL
Question: What is the pOH of a solution with a pH of 3.72?
Answer Options:
0.25
11.15
10.3
Answer: 10.28
Question: The chemical formula for a certain ionic compound is M3PO4. Assume M is a cation. When the substance is added to water, the concentration of M3+ at saturation is found to be 4.58 x 10^-7 M by titration. Calculate the Ksp for M3PO4.
Answer Options:
6.95 x 10^18
6.20 x 10^17
1.12 x 10^26
4.35 x 10^9
5.46 x 10^4
1.45 x 10^34
Answer: 1.45 x 10^34
Question: For the molecule below, finish the molecular formula C_xH_y. What is x and what is y?
(Carbon is black, Hydrogen is white in the structure.)
Answer Options:
Answer: C: 4
H: 10
Question: What mass of metal would be electroplated at the cathode of an electrolytic cell that uses the half-reaction below if 0.753 A is applied over 9.14 min?
Mg^2+(aq) -> Mg(s)
Answer Options:
5.80 x 10^-5 mg
1.9 x 10^-5 mg
2.5 x 10^-5 mg
5.20 x 10^-5 mg
1.14 x 10^-5 mg
1.96 x 10^-5 mg
Answer: 5.20 x 10^-5 mg
Question: Acetic acid is an example of
Answer Options:
a polyprotic acid.
a weak acid.
an inorganic compound.
a strong acid.
Answer: a weak acid.
Question: According to the U.S. Food and Drug Administration, the recommended daily requirement for protein is 44 g. This is ____ oz protein.
Answer Options:
Answer: 1.54
Question: Determine the pH if [H3O+] = 3.4×10^-4 M.
Report to 2 decimal places
Answer Options:
Answer: 3.47
Question: If a 25 mL solution containing 3.982 grams of sugar (C12H22O11) is diluted to 0.0569 L (56.9 mL), what will the new volume be? The density of the solution is 1.5 g/mL.
Answer Options:
Answer: 4.66 L
Question: A gold nugget has a mass of 52.1 g. The nugget is added to 50.0 mL of water, and the water level then reads 85.0 mL. What is the density of the gold nugget?
Answer Options:
Answer: 14.866
Question: Given two solvents, water (polar) and hexane (nonpolar), which solvent would be best at dissolving each of the following molecules?
Answer Options:
cholesterol (nonpolar lipid)
niacin (polar vitamin B3)
retinol (nonpolar vitamin A)
calcium carbonate (ionic calcium supplement)
Answer: hexane
water
hexane
water
Question: Use the table in Q6. [You should assume no supersaturated solution is formed.] A solution containing 82 g of NaNO3 in 75 g of water at 50°C is cooled to 20°C. How many grams of NaNO3 remain in solution at 20°C?
Answer Options:
Answer: 66
Question: Predict the molecular polarity of each of the following molecules. (All structures are given above)
Answer Options:
a. CCl4
b. BrF5
c. CO2
d. PCl5
Answer: a. Nonpolar
b. Polar
c. Nonpolar
d. Polar
Question: Write the following as a standard number: 8.25 x
1
0
−
2
10
−2
Answer Options:
Answer: 0.0825
Question: A sunscreen preparation contains 2.50% by mass benzyl salicylate. If a tube contains 6.0 oz of sunscreen, how many grams of benzyl salicylate are needed to manufacture 270 tubes of sunscreen? (1 oz = 28.35 g)
Answer Options:
Answer: 1.15
Question: What type of reaction is in Q6?
Answer Options:
Single Displacement
Synthesis/combination
Combustion
Decomposition
Double Displacement
Answer: Decomposition
Question: Looking at an uncolored, unmarked periodic table, identify if these are metals, metalloids, or nonmetals.
Answer Options:
arsenic
chromium
selenium
copper
Answer: metalloid
metal
nonmetal
metal
Question: Determine the pH if [OH-] = 2.0×10^-7 M.
Report to 2 decimal places
Answer Options:
Answer: 7.30