chem exam 2 t/f
A pressure cooker allows the pressure inside the cooker to rise above atmospheric pressure. This increases the boiling point of the water used to cook the food, thus cooking the food faster.
True
At STP 88 liters of CO2 contains the same number of molecules as 88 liters of N2
True
Colligative properties depend on the concentration of the particles in a solution, rather than on their identity.
True
If ice were denser than liquid water, lakes would freeze from the bottom up.
True
Most gases can be converted to liquids under conditions of high pressure and low temperature
True
Network covalent substances have one of the highest melting points of all substances.
True
Since acetone (nail polish remover) evaporates more readily than water, one would assume that acetone has weaker intermolecular forces.
True
The solvent in an aqueous solution is always water
True
Water is denser than most other liquids.
True
When heat is first added to an ice/water mixture at 0°C, the temperature of the water will not increase until all the ice has melted.
True
A steam burn is so painful because of water's high heat of fusion.
False
As temperature increases, so will the viscosity of a liquid.
False
At the same temperature and pressure, equal volumes of all gases will have the same mass.
False
Boiling takes place only at the surface of the liquid and only at one temperature
False
Liquids boil at higher temperatures in the mountains due to the higher altitude.
False
One mole of ANY gas will have a volume of 22.4 liters.
False
The mass of one molecule of oxygen is 32.0 grams
False
The melting point of metallic sodium is 97.8oC, so at a temperature of 25oC, it is a liquid
False
Theoretical yield in a chemical reaction is the amount of grams obtained in the actual experiment.
False
Water in Lake Michigan does not warm up readily in the summer because of water's low specific heat.
False
Water is a liquid at room temperature, due to its very small mass.
False
When the temperature of a liquid is increased, the molecules move faster, but there is no change in the vapor pressure of the liquid.
False
