solutions round mixturescollig. props vocab.formulasconc. problems solubility 100 200 300 400 500...
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Solutions Round
Mixtures Collig.Props
Vocab. Formulas Conc. Problems
Solubility
100 100 100 100 100 100200 200 200 200 200 200300 300 300 300 300 300400 400 400 400 400 400500 500 500 500 500 500
Gases Round
Mixtures - 100
• Silver and gold is an example of which solute-solvent combination?
Answer: solid-solid
Mixtures - 200
• This can be used to separate liquids that have different densities.
Answer: Centrifuge
Mixtures - 300
• What does not experience the Tyndall effect?
Answer: Solutions or homogeneous mixtures
Mixtures - 400
• Identify whether the following scenario describes a saturated, unsaturated or supersaturated solution.
• A single grain of solute is added to the solution, it sinks to the bottom of the container, and nothing else happens.
Answer: Saturated
Mixtures - 500
• A student is trying to determine if a liquid is a colloid, solution or suspension. The student cannot see through the mixture and the particles are not settling out. The liquid should be classified as a _______________________.
Answer: Colloid
Colligative Properties - 100
• A property that is determined by the number of particles present in a system but that is independent of the properties of the particles themselves.
Answer: Colligative Property
Colligative Properties - 200Which of the following is an example of using the
concept of boiling point elevation?a. Adding table salt in water to cook pastab. Adding rock salt on icy roadsc. Adding valve oil to a brass instrument during a Christmas parade to keep the valves from locking up.d. Adding ethylene glycol (antifreeze) to a car engine during the winter.
Answer: a
Colligative Property - 300
• To determine the melting point elevation, the concentration of the solution should be in:
Answer: Molality
Colligative Properties - 400
Which of the following would have the greatest impact on the freezing point of water?a. glucose (C6H12O6)
b. strontium sulfide (SrS)c. lithium bromide (LiBr2)
d. sodium chloride (NaCl)
Answer: C
Colligative Properties - 500
• Calculate the boiling point of a solution of 520 g of the ionic compound magnesium chloride, MgCl2, dissolved in 900 g of water. (kb of water is 0.51ºC/m and the normal boiling point of water is 100ºC)
Answer: 520g x 1mol/95.3g = 5.45 mol
Tb = KbmN = (0.51)(5.45/.900)(3) = 9.265ºC
100 + (9.265) = 109.3ºC
Vocabulary - 300
• A compound that concentrates at the boundary surface between two immiscible phases (solid-liquid, liquid-liquid, or liquid-gas).
Answer: Surfactant
Vocabulary - 400
• The law that relates partial pressure of a gas to its solubility is ____________________.
Answer: Henry’s Law
Vocabulary - 500
• The random movement of microscopic particles suspended in a fluid is known as:
Answer: Brownian Motion
Formulas - 300
• What is the formula to calculate the parts per million of a solution?
Answer: m = gsolute /gsolvent x 1000000Orm = masssolute /masssolvent x 1000000
Formulas - 500
• What is the formula used to calculate the change in freezing point.
Answer: Tf = kfmN
Concentration Problems - 100
• A sample of 1500.0 g of drinking water is found to contain 42 mg Pb. What is this concentration in parts per million?
Answer: 28 ppm
Concentration Problems - 200
• A solution contains 76.0 g of NaCl and has a volume of 550 mL. Find the molarity of the solution.
Answer: 2.36 M
Concentration Problems - 300
• You need to make 200 mL of 0.25 M HCl. How much 6.0 M HCl would you need?
Answer: 8.33 mL (use M1V1=M2V2)
Concentration Problems - 400
• How many grams of NaOH are required to prepare 1200 mL of a 0.50 M solution?
Answer: 24 g
0.50 = x/1.200 (M=mol/L)
x = 0.6 mol x 40g/1mol = 24 g
Concentration Problems - 500
• Legally, the concentration of methyl mercury needs to be less than 1.0 ppm in fish meat to be sold or eaten. What is the maximum amount in milligrams of methyl mercury allowed in a fish that weighs 2.25 kg?
Answer: 2.25 mg
1.0 = x/2250 x 1000000
x = 0.00225 g x 1000 = 2.25 mg
Solubility - 100• Describe a condition that has an effect on
solubility.Answer: Temperature – increases solubility of solids and liquids, decreases solubility of gases,Agitation – increases solubility of liquids and solidsSurface area – the smaller the surface area, the greater impact on solubilityPolarity – has to be the same polarity to be soluble
Solubility - 200
• How can the solubility of a gas be increased?
Answer: Increase pressure, decrease temp, decrease agitation
Solubility - 300• What chemical
has the most change in solubility as the temperature is changed from 0C to 100 C
Answer: NaC2H3O2 or sodium acetate
Solubility - 400
• At 10 °C, how much CsCl can be dissolved in 300 g of water?
Answer: about 513 g
171 x 3
Solubilty - 500
• At 90C, 30 g of Li2SO4 is dissolved in 100 g of water. Is this solution saturated, unsaturated, or supersaturated?
Answer: Unsaturated, because at 90C, water can hold 31 g of Li2SO4
Gases Round
Ideal Gases
Gas Laws Gas Law Problems
DiffusionConcepts
Misc. Vocab
200 200 200 200 200 200400 400 400 400 400 400600 600 600 600 600 600800 800 800 800 800 800
1000 1000 1000 1000 1000 1000
Ideal Gases - 400
According to the diagram to the right, at what pressure do all the gases most resemble an ideal gas?
0 atm
Ideal Gases - 600
Calculate the approximate volume of a 2.50 mol sample of gas at -8.0°C and a pressure of 3.50 atm.
15.5 L
Ideal Gases - 800
A 10.5 L sample of a gas has a mass of 95.9 g at 7.6 atm and 35°C. What is the molar mass of the gas? (Hint: divide the given mass by n).
30.4 g/mol
Ideal Gases - 1000
2H2O(l) + electricity 2H2(g) + O2(g)
What mass of H2O is needed to create 15.64 L of O2, if the temperature is 25°C and the pressure is 1.2 atm?
27.6 g
Gas Laws - 400Who developed the concept that the total
pressure of a mixture of gases is the sum of their partial pressures?
Dalton
Gas Laws - 600
Charles’s law is the direct relationship between ____________________ and volume.
Temperature
Gas Laws - 800
Who is accredited with the idea that in a reaction, two volumes of hydrogen gas will combine with one volume of oxygen gas to produce two volumes of water vapor?
Gay-Lussac
Gas Laws - 1000
The principle that under similar pressures and temperatures, equal volumes of gases contain the same number of molecules is attributed to ________________.
Avogadro
Gas Law Problems - 200
A mixture of gases with a pressure of 800.0 mm Hg contains 60% nitrogen and 40% oxygen by volume. What is the partial pressure of oxygen in this mixture?
320 mm Hg
Gas Law Problems - 400
A sample of oxygen occupies 350 mL when the pressure is 5 atm. At constant temperature, what volume does the gas occupy when pressure falls to 3 atm?
583 mL
Gas Law Problems - 800
Nitrogen reacts with hydrogen to make ammonia [N2 (g) + 3H2 (g) --> 2NH3 (g)]. If one needs to produce 4 L of ammonia, how many liters of nitrogen are needed?
2 L
Gas Law Problems - 1000
A sample of a gas has a pressure of 2.25 atm, a volume of 650 mL and a temperature of 36°C. What would the volume of the gas be if the pressure is increased to 3.20 atm and the temperature is decreased to 31°C?
449.6 mL
Diffusion Concepts - 200
This is the passage of a gas under pressure through a tiny opening.
Effusion
Diffusion Concepts - 400
The rate of diffusion of a gas depends on the ____________ of the gas.
Molar Mass
Diffusion Concepts - 600
What scientist studied effusion in detail and determined that the rate of effusion is indirectly proportional to the square root of the molar mass of the gas, if pressure and temperature are kept constant.
(Thomas) Graham
Diffusion Concepts - 800
To two decimal places, what will vA/vB be equal to if N2 is considered to be gas A and NO is considered to be gas B. (A diffusion problem)
1.03
Diffusion Concepts - 1000
What is the molar mass of a gas if it diffuses at a rate of 258 m/s while Iodine gas diffuses at 125 m/s at the same temperature?
29.7 g
Miscellaneous - 200
The average kinetic energy of random motion is proportional to the temperature in what unit?
Kelvin
Miscellaneous - 400
Standard temperature and pressure for a gas is ____________________
0°C (or 273 K) and 1 atm.
Miscellaneous - 1000
Line D represents water. If the atmospheric pressure in a flask is lowered to 70 kPa, water would boil at what temperature?
92 C
Vocabulary - 200
What does the constant bombardment of gas molecules against the inside of a container cause?
Pressure
Vocabulary - 400
The movement of particles from regions of higher concentrations to regions of lower concentration.
Diffusion
Vocabulary - 800
The pressure of each gas in a mixture is called the ____________________ pressure.
Partial