The weakest link

The weakest linkL

Round 114 questions 10 second delay

What are the postulates of the Kinetic molecular theory?

Gases are made of small particles Take up little volume compared with

the volume of the container Move in straight lines Have no attractive or repulsive forces

(mostly) Elastic collisions Average kinetic energy = temp.

The random movement of particles from an area of high concentration to an area of low concentration is:

Diffusion

Is effusion is directly or inversely proportional to the square root of molar mass?

Inversely

Is Pressure directly or inversely proportional to volume according to Boyles law?

Inversely

Is temperature directly or inversely proportional to volume according to charles law?

Directly

Is temperature directly or inversely proportional to pressure according to gay lussacs law?

Directly

Molecules with a small atomic mass typically form which state of matter?

Gas

When a gas is heated what property will increase?(Pressure, volume, both neither?)

Both

When a bond forms is it endothermic or exothermic

Exothermic

End of roundWho is the weakest link


Calculate: if a balloon has an original volume of 1.5L at STP, what is the new pressure inside the balloon when it is compressed to 1.0L?

1,140mmHg

Calculate: if the initial volume of a balloon is 1.5L at standard pressure and room temp (25°C). What will the new volume of the balloon be when the temp drops to 3°C?

1,140mmHg

Calculate: 500mL sample of O2 gas at 760mmHg is compressed to 100mL what will the new pressure be?

3800mm Hg

Calculate: a sample of gas occupies 45.2mL at 720mm Hg. What is its volume at standard atmospheric pressure?

43mL

Calculate: A sample of oxygen is collected over water at a total pressure of 755 torr at 20°C. Calculate the pressure of oxygen, if water vapor has a partial pressure of 17.5 torr at 20°C.

737.5 torr

Calculate: What is the partial pressure of hydrogen gas in a mixture of hydrogen and helium if the total pressure is 600 mm Hg and the partial pressure of helium is 439 mm Hg?

161 mm Hg

Calculate: Find the total pressure for a mixture that contains four gases with partial pressures of 5.00 KPa, 4.46 KPa, 3.02 KPa, and 1.20 KPa.

13.78 KPa

Calculate: you have 5.00 L of helium in a balloon at 1.00 atm, if you decrease the volume to 2.00 L, what would your balloons pressure be?

2.5atm

Calculate: The pressure of a sample of helium is a 1.00L container is 0.988atm, what is the new pressure if the sample is placed in a 2.00L container?

0.494 atm

Calculate: A sample of neon gas occupies 0.220L at 0.860atm, what ill be it’s volume oat 29.2kPa pressure?

0.657L

Calculate: What is the volume of air in a balloon that occupies 0.620L at 25°C if the temperature is lowered to 0.00°C?

0.57L

Calculate: A gas at 89°C occupies a volume of 0.67L. At what Celsius temperature will the volume increase to 1.12L?

330°C



What is the combined gas law?

P1V1 = P2V2T1 T2

Which three (3) laws are demonstrated by the combined gas law?

Boyles Charles Gay-lussacs

Calculate: A helium filled balloon at sea level has a volume of 2.1L at 0.998atm and 36°C. If it is raises to an elevation at which the pressure is 0.900atm and the temperature is 28°C, what will the new volume of the balloon be?

2.3L

Calculate: At 0.00°C and 1.00atm, a sample of gas occupies 30.0mL. If the temperature is increased to 30.0°C and the entire sample is transferred to a 20.0mL container, what will the gas pressure be inside the container?

1.66atm

What is the ideal gas equation?

PV=nRT

What does the n in the ideal gas equation stand for?

PV=nRT

What the equation used to calculate Molar mass if you are given density of a gas?

M = DRT/P

What is the units of the ideal gas constant?

mmHg L/mol K

calculate the number of moles of a gas contained in a 3.0L vessel at 300K with a pressure of 1.5atm

0.18mol = n

At what temperature would 2.10 moles of N2 gas have a pressure of 1.25 atm and in a 25.0 L tank?

181 K



What volume is occupied by 5.03 g of O2 at 28°C and a pressure of 0.998atm?

3.9 L

Calculate the pressure in a 212 Liter tank containing 23.3 kg of argon gas at25°C?

67.3 atm



Which phase of matter has the HIGHEST attractive forces?

Solids

Which state of matter is MOST fluid?

Gases

The resistance of a substance to flow is called:

Viscosity

Which state of matter takes the MOST pressure to compress:

Solids

The resistance of a substance to flow is called:

Viscosity

Viscosity is controlled by three properties name one.

Temperature Attraction shape

What property of water is a measure of the inward pull of the molecules?

Surface tension

What property of liquids allows water to travel up against gravity through small spaces?

Capillary action



What type of energy is measured with temp?

Kinetic energy

Which attractive force, intermolecular force, is weakest?

Dispersion forces

Which attractive force, intermolecular force, is formed between polar compounds?

Dipole dipole

Which energy is stored in bonds?

potential

Which attractive force, intermolecular force, is utilized by living systems to hold DNA together. Works like velcro?

Hydrogen bonds

What is the units for energy?

Joules (J)



What does letter A signify?

Activation energy

What does letter C signify?

Heat of reaction

What does letter B signify?

Activation energy in thereverse reaction

Endo or exothermic

endothermic

What is DH for this reaction?

300J – 100J = +200J



Calculate: If the temperature of 34.4g of ethanol increases from 25.0°C to 78.8°C how much heat will be absorbed by ethanol? (cethanol = 2.44 j/g°C)

4520 J

Calculate: A 4.50g nugget of pure gold absorbed 276J of heat. What was the final temperature of the gold if the initial temperature was 25.0°C? (cgold = 0.129J/g°C)

500 °C

Calculate: the energy required to take a 5g block of ice from -100°C to 200°C if the specific heat of 4.18J/g°C and the heat of fusion is 4,100J/g and the heat of vaporization is 60,100J/g

327270J

Calculate: the energy required to take a 5g of water vapor from 100°C to -200°C if the specific heat of 4.18J/g°C and the heat of fusion is 4,100J/g and the heat of vaporization is 60,100J/g

-327270J

The Impossible Tie Breaker What is the third word, in the third line

of the third scene, of the third act of Shakespeare’s play Henry the third

Radcliff

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The weakest link