Module 2: Quiz 2
Which of the following statements about water is true? 1. Water participates in Hydrogen bonding. 2. Water is an important element in our bodies. 3. Hydrogen and oxygen in water are held together by an ionic bond. 4. Electrons are shared equally between the hydrogen and oxygen. Question options: A) 1, 2, 3, 4 B) 1, 2, 3 C) 1, 2 D) 1 E) 2, 3, 4
A) 1, 2, 3, 4 1. Water participates in Hydrogen bonding. 2. Water is an important element in our bodies. 3. Hydrogen and oxygen in water are held together by an ionic bond. 4. Electrons are shared equally between the hydrogen and oxygen.
How many molecules are contained in one mole? Question options: A) 6.02 X 10^23 B) 6.02X10^22 C) 6.02 X 10^21 D) 6.02 X 10^24
A) 6.02 X 10^23
What is a mole? Question options: A) 6.02x10^23 molecules B) an easier way to quantize molecules C) the molecular weight of a substance measured in grams D) all of the above
A) 6.02x10^23 molecules B) an easier way to quantize molecules C) the molecular weight of a substance measured in grams
How does water help to maintain the body's temperature even when the weather is cold? Question options: A) As water molecules slow down they form more hydrogen bonds and release energy. B) When the body experiences a large drop in temperature it forces the water molecules to move faster in order to break hydrogen bonds and release energy as heat. C) As the temperature decreases the water molecules lose kinetic energy, this allows them to form more stable polar covalent bonds. D) Since water has a high heat capacity it retains heat longer. E) a, c, d F) b, c, d G) a and c H) a and d
A) As water molecules slow down they form more hydrogen bonds and release energy. D) Since water has a high heat capacity it retains heat longer.
___________ is an example of a hydrophobic molecule, whereas ___________ is an example of a hydrophilic molecule. Question options: A) Fat, sugar B) Oil, fat C) salt, oil D) salt, sugar
A) Fat, sugar
Why does water have so many of the unique characteristics that it does? Question options: A) Hydrogen Bonds allow it to interact with itself and other polar molecules. B) Its covalent bonds are easily broken so H and O can interact with other molecules. C) Having 2 Hydrogen's in one molecule allow it to be extremely reactive. D) It is able to interact with molecules that are both polar and nonpolar.
A) Hydrogen Bonds allow it to interact with itself and other polar molecules.
Important electrolyte(s) in the body include... Question options: A) K+ B) Na+ C) Ca2+ D) Cl- E) HC03- F) H+ G) Mg2+ H) all of the above
A) K+ B) Na+ C) Ca2+ D) Cl- E) HC03- F) H+ G) Mg2+
Why does NaCl dissociate in water and not glucose? Question options: A) NaCl is bound by ionic bonds and glucose atoms are covalently bonded. B) Glucose is bound by ionic bonds and NaCl atoms are covalently bonded. C) Glucose is a much larger molecule so it can't be broken down by water. D) Glucose is hydrophobic.
A) NaCl is bound by ionic bonds and glucose atoms are covalently bonded.
Tom is in his chemistry class and notices that the water in his test tube forms a "U" shape (meniscus) on the top surface. What reasonable conclusion can be made based on this information? Question options: A) The test tube is made of polar molecules. B) Atmospheric pressure is pushing down more on the center than on the sides. C) Test tubes are rounded at the bottom so the center of the water column will be lower than the sides. D) The test tube needs more water to make it level.
A) The test tube is made of polar molecules.
Why is it important to drink adequate amounts of water each day? Question options: A) Water helps to regulate body temperature. B) Water helps to lubricate the joints. C) Water dissolves solutes, which allows chemical reactions to occur. D) all of the above
A) Water helps to regulate body temperature. B) Water helps to lubricate the joints. C) Water dissolves solutes, which allows chemical reactions to occur.
Which of the following statements about water is true? Question options: A) Water is a molecule B) Water is a compound C) Water contains polar covalent bonds D) Water molecules form intermolecular hydrogen bonds E) all of the above
A) Water is a molecule B) Water is a compound C) Water contains polar covalent bonds D) Water molecules form intermolecular hydrogen bonds
The osmolarity of a solution is _________. Question options: A) a measure of solute concentration. B) a measure of solute type. C) the weight of a solid substance. D) reflects a measure of the amount of oil dissolved in a water. E) a scientific term for determining the solubility of a substance in water.
A) a measure of solute concentration.
Water is a good solvent for __________ molecules, because it has __________ with the solutes. Question options: A) hydrophilic, electrical charge attractions B) hydrophilic, polar covalent bonds C) hydrophobic, hydrogen bonds D) hydrophobic, electrical charge attractions
A) hydrophilic, electrical charge attractions
Substances dissolved in water are called _________. Question options: A) solutes. B) solvents. C) catalysts. D) osmoles. E) insoluble.
A) solutes
To make a 1% solution of glucose, you would dissolve ____ gram(s) of glucose into enough water to make a 100mL solution. Question options: A) 0.1 B) 1 C) 10 D) 100
B) 1
When one mole of potassium chloride (KCl) dissolves in water it dissociates into two ions. After the ions dissociate we could say that there is/are __________ mole(s) of K+ in solution and __________ mole(s) of Cl- in solution. Question options: A) ½, ½ B) 1, 1 C) 2, 2 D) 1, 2
B) 1, 1
Which of the following statements about water is true? 1. Water participates in Hydrogen bonding. 2. Water is an important element in our bodies. 3. Hydrogen and oxygen in water are held together by an ionic bond. 4. Electrons are shared equally between the hydrogen and oxygen. Question options: A) 1, 2, 3, 4 B) 1, 2, 3 C) 1, 2 D) 1 E) 2, 3, 4
B) 1, 2, 3 1. Water participates in Hydrogen bonding. 2. Water is an important element in our bodies. 3. Hydrogen and oxygen in water are held together by an ionic bond.
If you place 2 Osm of NaCl into water, what is the osmolarity of Na+ in water? Question options: A) 0.5 Osm B) 1.0 Osm C) 1.5 Osm D) 2.0 Osm
B) 1.0 Osm
The ability of water to stick to other polar substances is termed: Question options: A) Hydrogen bonds B) Cohesion C) Adhesion D) Lubrication
C) Adhesion
Which statement is NOT true about water? Question options: A) Pure water is a non-electrolyte B) The attraction of water molecules to each other is called cohesion C) Water is a nonpolar solvent D) Approximately 92% of plasma is water
C) Water is a nonpolar solvent
In order to produce a 9% solution of glucose, I should add 9 __________ of glucose to 100 __________ of water. Question options: A) milligrams, milliliters B) milligrams, deciliters C) grams, milliliters D) grams, liters
C) grams, milliliters
A milliosmole Question options: A) is 1/10 of an osmole B) is 1/100 of an osmole C) is 1/1000 of an osmole D) is 1/10,000 of an osmole
C) is 1/1000 of an osmole
Osmolarity differs from molarity Question options: A) osmolarity is in the body and molarity is in a beaker B) osmolarity is a solution of organic molecules and molarity is inorganic C) osmolarity reflects the number of particles in solution D) osmolarity reflects the type of particles in solution
C) osmolarity reflects the number of particles in solution
Electrolytes are Question options: A) nonpolar molecules. B) substances that usually don't dissolve in water. C) found in solutions that do not conduct electricity. D) cations and anions that dissociate in water.
D) cations and anions that dissociate in water.
Ions dissolved in water could be called ________. Question options: A) isomers B) solvents C) coenzymes D) electrolytes E) monomers
D) electrolytes
One calorie is the amount of energy needed to raise the temperature of one __________ of water one degree __________. Question options: A) liter, Celsius B) liter, Fahrenheit C) gram, Fahrenheit D) gram, Celsius
D) gram, Celsius
You are given two unknown liquids labeled X and Y. You decide to run some experiments to determine what they are. You pour the liquids into separate beakers and begin to heat them up. As the liquids sit on the hot plate you notice that liquid X heats up much faster and begins to boil. Based on this information, what can you conclude about the hydrogen bonds in each liquid? Question options: A) Liquid X can form more hydrogen bonds. B) Liquid Y can form more hydrogen bonds. C) Liquid X has a higher heat of vaporization. D) Liquid Y has a higher heat of vaporization. E) a and d F) b and d
B) Liquid Y can form more hydrogen bonds. D) Liquid Y has a higher heat of vaporization.
What is the difference between molarity and osmolarity? Question options: A) Molarity refers to moles per liter and osmolarity refers to grams per 100 ml B) Molarity is used for solutes added to water and osmolarity considers any dissociation that may occur in water. C) Molarity is more accurate to use when referring to solute concentration in body fluids D) All of the above are TRUE statements
B) Molarity is used for solutes added to water and osmolarity considers any dissociation that may occur in water.
If 3 moles of MgCl2 are put in a Liter of water then which of the following statements is TRUE? (Mark all that are TRUE...there may be more than one). Question options: A) The solution would have a molarity of 1 B) The solution would have a molarity of 3 C) The solution would have an osmolarity of 3 D) The solution would have an osmolarity of 6 E) The solution would have a molarity of 6 F) The solution would have a molarity of 1.5 G) The solution would have an osmolarity of 1.5 H) The solution would have an osmolarity of 9
B) The solution would have a molarity of 3 H) The solution would have an osmolarity of 9
Hydrogen bonds cause surface tension in water, allowing some small organisms, like water striders, to move around on the surface of the water without getting wet. If you introduce soap (a large compound made up of polar covalent bonds) to the water, the surface tension disappears, and the water striders will sink into the water. This is because... Question options: A) Water striders can't swim B) Water makes hydrogen bonds with the soap instead of with itself, disrupting the surface tension C) Soap dissociates in the water, becoming an electrolyte, and disrupting the surface tension D) Soap creates new covalent bonds with water, becoming non-polar so surface tension disappears E) None of the above.
B) Water makes hydrogen bonds with the soap instead of with itself, disrupting the surface tension
When ionic compounds dissolve in water, their ions ________. Question options: A) cling tightly together. B) dissociate or separate from one another. C) lose their charge. D) settle to the bottom of the container.
B) dissociate or separate from one another.
What is NOT a biological function of water? Question options: A) protection and lubrication B) regulation of blood volume C) involved in many chemical reactions necessary for life D) stabilizing body temperature
B) regulation of blood volume