Which phase change is the opposite of boiling?(1 point)
Responses
evaporation
evaporation
melting
melting
condensation
condensation
freezing
freezing
Which table correctly shows the relationships between volume, pressure, and temperature of an enclosed gas?(1 point)
Responses
Quantities Relationship
volume and temperature directly proportional
pressure and volume directly proportional
pressure and temperature inversely proportional
Quantities Relationship volume and temperature directly proportional pressure and volume directly proportional pressure and temperature inversely proportional
Quantities Relationship
volume and temperature inversely proportional
pressure and volume inversely proportional
pressure and temperature directly proportional
Quantities Relationship volume and temperature inversely proportional pressure and volume inversely proportional pressure and temperature directly proportional
Quantities Relationship
volume and temperature directly proportional
pressure and volume inversely proportional
pressure and temperature directly proportional
Quantities Relationship volume and temperature directly proportional pressure and volume inversely proportional pressure and temperature directly proportional
Quantities Relationship
volume and temperature inversely proportional
pressure and volume directly proportional
pressure and temperature directly proportional
Quantities Relationship
volume and temperature inversely proportional
pressure and volume directly proportional
pressure and temperature directly proportional
Which observation is inconsistent with the ideal gas law?(1 point)
Responses
When temperature is held constant and volume increases, the pressure increases.
When temperature is held constant and volume increases, the pressure increases.
When volume is held constant and the temperature increases, the pressure increases.
When volume is held constant and the temperature increases, the pressure increases.
When pressure is held constant and volume increases, the temperature increases.
When pressure is held constant and volume increases, the temperature increases.
When nothing is held constant and pressure and volume both increase, the temperature increases.
When pressure is held constant and volume increases, the temperature increases.
A gaseous product of a reaction is collected at 280K and 0.95 atm. Given R=0.0821L⋅atmmol⋅K
R
=
0.0821
L
⋅
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?(1 point)
Responses
133 g/mol
133 g/mol
0.04 g/mol
0.04 g/mol
27 g/mol
27 g/mol
24 g/mol
To solve this problem, we can use the Ideal Gas Law equation:
PV = nRT
where:
P = pressure (0.95 atm)
V = volume (4.92 L)
n = number of moles of gas
R = gas constant (0.0821 L·atm/mol·K)
T = temperature in Kelvin (280K)
First, we need to calculate the number of moles of gas:
n = PV / RT
n = (0.95 atm)(4.92 L) / (0.0821 L·atm/mol·K)(280K)
n = 0.0453 mol
Next, we will calculate the molar mass of the gas using the given mass and the calculated number of moles:
molar mass = mass / number of moles
molar mass = 5.49 g / 0.0453 mol
molar mass = 121.17 g/mol
Therefore, the molar mass of the gas is approximately 121.17 g/mol.
When salt dissolves completely into water, which term is used to describe the water? (1 point)
Responses
solute
solute
solution
solution
solvent
solvent
concentration
solvent
Which statement best describes what it means when something is classified as a strong acid?(1 point)
Responses
It resists dissociating into ions in solution.
It resists dissociating into ions in solution.
It is present in low quantities in a solution.
It is present in low quantities in a solution.
It easily dissociates into ions in solution.
It easily dissociates into ions in solution.
It is present in large quantities in a solution.