Chemistry Unit 5 lesson 8 Gases Unit Test
As the pressure of an enclosed gas decreases to half its original value, what happens to the volume of the gas if temperature is held constant?
The volume increases to twice its original value.
Which formula shows a correct representation of the combined gas law?
V1P1/T1=V2P2/T2
A gaseous product of a reaction is collected at 280K and 0.95 atm. Given R=0.0821L⋅atm/mol⋅K, what is the molar mass of the gas, in grams per mole, if 5.49 g of gas occupies 4.92 L?
27 g/mol
Which observation is inconsistent with the ideal gas law?
When temperature is held constant and volume increases, the pressure increases.
The relationships among which variable quantities are expressed by the ideal gas law equation? Responses
pressure, volume, temperature, number of moles
The molar volume of a gas increases by a factor of 2. Which parameter change could have caused the shift in molar volume?
the temperature increasing by a factor of 2
Given R=0.0821L⋅atm/mol⋅K, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270K?
7.10 L/mol
A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely investigating?
Gay-Lussac's law, by seeing how changes in temperature affect the pressure of the gas
Which measure of a gas does the expression nRT/P represent?
volume
Which table correctly shows the relationships between volume, pressure, and temperature of an enclosed gas?
-Volume and temperature = directly proportional -pressure and volume = inversely proportional -pressure and temperature = directly proportional
Given R=0.0821L⋅atm/mol⋅K, how many moles of gas are in a 1.25 L container at 300K and 2.07 atm?
0.105 mol
Which statement best describes the graph of the relationship between the volume and temperature of an enclosed gas?
It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume.
There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?
keeping the pressure constant and increasing the temperature
