Chem Test

The pressure exerted by the particles of vapor above a liquid is called the _____. a) atmospheric pressure b) vapor pressure c) barometric pressure d) molar pressure e) standard pressure

vapor pressure

A red blood cell will undergo hemolysis in a) 5% glucose b) 0.9% NaCl c) 10% glucose d) water e) 5% NaCl

water

Which measurement describes the pressure of a gas? a) 0.45 moles b) 315 K c) 1.2 g/L d) 2.5 L e) 725 mmHg

725 mmHg

In the reaction of nitrogen and hydrogen to give ammonia, all the reactants and products are __________. a) liquids b) gases c) solids d) frozen e) boiling

gases

Which of the following correctly describes the partial pressures of gases in the body? a) high O2, low CO2, oxygenated blood b) high O2, low CO2, deoxygenated blood c) high O2, high CO2, tissue d) low O2, low CO2, deoxygenated blood e) high O2, high CO2, oxygenated blood

high O2, low CO2, oxygenated blood

An autoclave is used to sterilize surgical equipment because a) it allows water to boil at temperatures above 100 C b) it allows water to boil at 100 C at pressures less than 1 atm c) it allows water to boil at 100 C at pressures greater than 1 atm d) it allows water to boil at temperatures less than 100 C e) it provides very high temperatures and very low pressures

it allows water to boil at temperatures above 100 C

In the kinetic molecular theory of gas behavior, the distance between gas molecules is assumed to be __________ the diameter of the gas molecules. a) dependent on b) 22.4 times c) approximately the same as d) large relative to e) small relative to

large relative to

A gas sample contains 4.0 g of CH4 and 2.0 g of He. What is the volume of the sample at STP? a) 130 L b) 11 L c) 30. L d) 5.6 L e) 17 L

17 L

At STP, temperature and pressure have the values of a) 0 K and 760 mmHg b) 760 K and 273 atm c) 273 K and 1 mmHg d) 273 K and 760 mmHg e) 0 K and 1 atm

273 K and 760 mmHg

1.25 moles of PbO2 have a mass of a) 279 g b) 299 g c) 191 g d) 178 g e) 239 g

299 g

Treatment of carbon monoxide poisoning can be accomplished by the use of pure oxygen for breathing. This is an example of the use of __________ in a clinical setting. a) the ideal gas law b) henry's law c) Le Chatelier's principle d) conservation of mas e) a precipitation reaction

Le Chatelier's principle

When the combined gas law is rearranged to solve for V2, the following is the correct expression: V2= a) P2T2 / P1V1T1 b) P1V1/T1 - P2/V2 c) T2T1V1 / P2P1 d) P1V1T1 / P2T2 e) P1V1T2 / P2T1

P1V1T2 / P2T1

The solubility of KI is 50 g in 100 g of H2O at 20 °C. If 110 grams of KI are added to 200 grams of H2O a) the solution will start boiling b) the solution will freeze c) a saturated solution will form d) all of the KI will dissolve e) the solution will be unsaturated

a saturated solution will form

A catalyst is a) a substance that increases the energy of the products b) a substance that speeds up a reaction without being consumed in the reaction c) a product in a chemical reaction d) a reactant in a chemical reaction e) a substance that decreases the energy of the products

a substance that speeds up a reaction without being consumed in the reaction

An aqueous mixture containing starch (a colloid), NaCl, glucose, and albumin (a colloid) is placed in a dialysis bag and immersed in distilled water. Which of the following correctly describes the location of the indicated substance after dialysis? a) starch outside b) water inside only c) starch inside and outside d) albumin, inside e) albumin inside and outside

albumin, inside

A hydrogen bond is a) a covalent bond between H and O b) a bond that is stronger than a covalent bond c) the polar O-H bond in water d) an ionic bond between H and another atom e) an attraction between a hydrogen atom attached to N,O, or F and an N,O, or F atom on another molecule

an attraction between a hydrogen atom attached to N,O, or F and an N,O, or F atom on another molecule

Refrigerating perishable foods affects biochemical reactions by a) improving the appearance of the foods b) catalyzing the removal of harmful chemicals from the foods c) decreasing the rate of reactions affecting spoilage d) increasing concentrations of antioxidants e) removing bacteria

decreasing the rate of reactions affecting spoilage

A 4% starch solution and a 10% starch solution separated by a semipermeable membrane. The process that occurs in the system is a) dialysis b) neutralization c) filtration d) osmosis e) hydration

osmosis

A solution is prepared by dissolving 2 g of KCl in 100 g of H20. In this solution, H2O is the a) solute b) solid c) solvent d) ionic compound e) solution

solvent

A balloon is put into a chamber whose pressure is less than the atmospheric pressure and at atmospheric temperature. a) the balloon would get smaller b) the balloon would stay the same c) the balloon would get bigger

the balloon would get bigger