What of the following is an advantage of the therm properties of plastic? (1 point)
Responses
Hearing plastics eliminated the risk of BPA exposure.
The thermal conductivity of plastic is very high, making it a good material to transmit heat
Plastics are safe to use in microwave ovens.
Plastics are easy to mold into any shape.
Plastics are easy to mold into any shape.
Which phase change is the opposite of boiling?(1 point)
Responses
evaporation
freezing
condensation
melting
Condensation
Which phase change is the opposite of boiling?(1 point)
Responses
evaporation
evaporation
freezing
freezing
condensation
condensation
melting
Condensation
Which observation is inconsistent with the ideal gas law?(1 point)
Responses
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 temperature is held constant and volume increases, the pressure increases.
When temperature is held constant and volume increases, the pressure increases.
When nothing is held constant and pressure and volume both increase, the temperature increases.
When nothing is held constant and pressure and volume both increase, the temperature increases.
When temperature is held constant and volume increases, the pressure increases.
A gaseous product of a reaction is collected at 280K and 0.95 atm. Given R=0.0821L⋅atmmol⋅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
0.04 g/mol
0.04 g/mol
27 g/mol
27 g/mol
133 g/mol
133 g/mol
24 g/mol
To find the molar mass of the gas, we can first calculate the number of moles using the ideal gas law equation:
PV = nRT
where:
P = pressure (0.95 atm)
V = volume (4.92 L)
n = number of moles (to be determined)
R = ideal gas constant (0.0821 L⋅atm/mol⋅K)
T = temperature (280K)
Rearranging the equation to solve for n:
n = (PV) / (RT)
Substituting the given values:
n = (0.95 atm * 4.92 L) / (0.0821 L⋅atm/mol⋅K * 280K)
n = 0.2252 mol
Now, we can calculate the molar mass (M) using the formula:
M = molar mass / number of moles
Substituting the given mass (5.49 g) and the calculated moles (0.2252 mol):
M = 5.49 g / 0.2252 mol
M ≈ 24.38 g/mol
To the nearest whole number, the molar mass of the gas is 24 g/mol.
Based on patterns in the periodic table, which list shows the acids in order from strongest to weakest?
(1 point)
Responses
HCl, H2S, PH3
HCl, H 2 S, PH 3
HCl, PH3, H2S
HCl, PH 3 , H 2 S
H2S, PH3, HCl
H 2 S, PH 3 , HCl
PH3, H2S, HCl