Exam 3: Water and Life

You have two beakers.One contains a solution of HCl at pH = 1.0.The other contains a solution of NaOH at pH = 13.Into a third beaker,you slowly and cautiously pour 20 mL of the HCl and 20 mL of the NaOH.After complete stirring,the pH of the mixture will be

How many molecules of glucose (C₆H₁₂O₆ molecular mass = 180 daltons)would be present in 90 grams of glucose?

Use the following figure to answer the questions below. -How many grams of the compound in the figure above would be required to make 2.5 L of a 1 M solution? (carbon = 12,oxygen = 16,hydrogen = 1)

Hydrophobic substances such as vegetable oil are

Which of the following is a property of liquid water? Liquid water ________.

Which of the following ionizes completely in solution and is considered to be a strong base (alkali)?

One mole (mol)of glucose (molecular mass = 180 daltons)is

Use the following figure to answer the questions below. -How many grams of the compound in the figure above would be required to make 1 L of a 0.5 M solution? (carbon = 12,oxygen = 16,hydrogen = 1)

Identical heat lamps are arranged to shine on identical containers of water and methanol (wood alcohol),so that each liquid absorbs the same amount of energy minute by minute.The covalent bonds of methanol molecules are nonpolar,so there are no hydrogen bonds among methanol molecules.Which of the following graphs correctly describes what will happen to the temperature of the water and the methanol?

Which type of bond must be broken for water to vaporize?

If the cytoplasm of a cell is at pH 7,and the mitochondrial matrix is at pH 8,this means that

Many mammals control their body temperature by sweating.Which property of water is most directly responsible for the ability of sweat to lower body temperature?

You have a freshly prepared 1 M solution of glucose in water.You carefully pour out a 100 mL sample of that solution.How many glucose molecules are included in that 100 mL sample?

To act as an effective coolant in a car's radiator,a substance has to have the capacity to absorb a great deal of heat.You have a reference book with tables listing the physical properties of many liquids.In choosing a coolant for your car,which table would you check first?

If a solution has a pH of 7,this means that

The molecular weight of water is 18 daltons.What is the molarity of 1 litre of pure water? (Hint: What is the mass of 1 litre of pure water?)

Consider the following reaction at equilibrium: What would be the effect of adding additional H₂CO₃?

You have two beakers.One contains pure water; the other contains pure methanol (wood alcohol).The covalent bonds of methanol molecules are nonpolar,so there are no hydrogen bonds among methanol molecules.You pour crystals of table salt (NaCl)into each beaker.Predict what will happen.

Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7.From this information,we can reasonably conclude that

-Based on your knowledge of the polarity of water molecules,the solute molecule depicted here is most likely