Chem 11.3-14.3
Common units for the gas constant R are...
(L x atm)/(mol x K)
Which of the following values for heat of solution involves the greatest release of energy?
(lowest number)
Absolute zero is equal to...
-273 degrees C
A solution contains particles whose size is...
.1 nm to 1 nm
Standard temperature is exactly...
0 degrees C
The principle that under similar pressures and temperatures, equal volumes of gases contain the same number of molecules is attributed to...
Avogadro
The ideal gas law combines Boyle's law, Charles' law, and...
Avogadro's principle
Pressure and volume changes at constant temperature can be calculated using the law developed by...
Boyle
The idea that the total pressure of a mixture of gases is the sum of their partial pressures is credited to...
Dalton
The law that helps to explain the volume ratios in a chemical reaction is...
Gay-Lussac's Law
If the volumes of the gaseous reactants and products in the equation 2C2H6 + 7O2 yields 4CO2 + 6H2O are measured under ordinary conditions, the substance that could not be included in the volume relationship has the formula...
H2O
Endothermic dissolving processes...
absorb heat and have positive heats of solution
A homogeneous mixture of metals is an...
alloy
Two substances that are immiscible are...
benzene and water
The volume of a gas is directly proportional to the number of moles if...
both pressure and temperature are constant
Gay-Lussac recognized that at constant temperature and pressure, the volumes of gaseous reactants and products...
can be expressed as ratios of small whole numbers
An example of a nonpolar solvent is...
carbon tetrachloride
A solid whose solubility decreases with increasing temperature is...
cerium sulfate
Suppose that two gases with unequal molecular masses were injected into opposite ends of a long tube at the same time and allowed to diffuse toward the center. They should begin to mix...
closer to the end that held the heavier gas
Mixtures whose particles are smaller than those in heterogenous mixtures and larger than those in solutions are called...
colloid
Volumes of gaseous reactants and products in a chemical reaction can be expressed as ratios of small whole numbers if...
constant temperature and pressure are maintained
The molar volume of a gas is not...
dependent on the size of the molecules
A solution that contains a low concentration of solute must be...
dilute, but may be saturated or unsaturated
Which of the following is a solvent for both polar and nonpolar solutes?
ethanol
The type of problem in which the atomic masses are not used in the calculations is...
gas volume-gas volume
A suspension contains solute particles whose size is...
greater than 1000 nm
A mixture that has components that are not easily distinguishable is a...
homogeneous
A salt-water solution is an example of a...
homogeneous mixture
A molecular substance whose water solution conducts electricity is...
hydrogen chloride
If a gas at 0 degrees C were warmed to 1 degree C and the pressure did not change, then the volume would...
increase
solutions of nonelectrolytes do not contain...
ions
The value of R, the ideal gas constant, can be calculated from the measured values of a gas's pressure, volume, temperature, and...
molar amount
Knowing the mass and volume of a gas at STP allows one to calculate the...
molar mass of the gas
According to Graham;s law, two gases at the same temperature and pressure will have different rates of diffusion because they have different...
molar masses
The molar mass of a gas at STP is simply the density of the gas...
multiplied by 22.4 L
Carbon tetrachloride and benzene are...
nonpolar
At STP, standard molar volume of a gas of known volume can be used to calculate the...
number of moles of gas
According to Avogadro's principle, in a chemical equation equal volumes of gases contain equal...
numbers of molecules
The law of combining volumes applies...
only to gases
Sugar is soluble in water because sugar molecules are...
polar
Which of the following would be soluble in water?
potassium nitrate
Ammonia is more water-soluble than expected because it...
reacts with water
A solution at equilibrium is a...
saturated solution
An example of an electrolyte...
sodium chloride
To correct for the partial pressure of water vapor, the vapor pressure of H2O at the collecting temperature is...
subtracted from the gas temperature
An example of a nonelectrolyte is...
sugar
An example of a homogenous mixture is...
sugar water
Pressures is defined as the force per unit of...
surface area
The average kinetic energy of the molecules of any gas is determined by...
temperature
To use the ideal gas law to determine the molar mass of a gas...
the mass of any known volume of the gas may be used
According to Graham's law, the rates of diffusion of two gasses at the same temperature and pressure are inversely proportional to...
the square roots of their molar masses
A sample of gas at a constant volume experiences a drop in pressure of 75mmHg. The most likely explanation is...
the temperature decreased
It is believed that absolute zero is the coldest possible temperature because at that temperature...
the volume of any gas should become zero
If the molecular formula of a gas is known, the molecular volume is used directly in solving...
the volume of any mass of gas
If gas A has a molar mass greater than that of gas B and samples of each gas at identical temperatures and pressures contain equal numbers of molecules then...
the volumes of gas A and gas B are equal
For reactants or products that are gases, the coefficients in the chemical equation indicate...
volume
An example of a pure substance is...
water
Avogadro's principle led to the realization that the molecules of some substances...
were made of more than one atom
An example of a heterogeneous mixture is...
whole-wheat bread
