Biology II chemistry

Biology II Lab

  1. Top of Form
  • Dear Students:
  • Please answer the following questions.-
  • 1.- What is the Phylum Porifera? Please give an example.
  •  
  • 2.- The clade Bilateria includes:
  • a.- sponges.
  • b.- cnidarians
  • c.- ctenophores
  • d.- arthropods
  • e.- mollusks
  •  
  • 3.- Animals with a water vascular system include:
  • a.- hemichordates
  • b.- chordates
  • c.- sponges
  • d.-nematodes.
  • e.- echinoderms
  •  
  • 4.- The taxon that has epidermal stinging cells is : ________________________
  •  
  • 5.- Please give 2 examples of Phylum Platyhelminthes.
  •  
  • 6.- Please name 2 important characteristics of Phylum Mollusca-Clams.
  •  
  • 7.- Lumbricus terrestris pertains to the Phylum ___________________
  •  
  • Bottom of Form

Classwork Chapter 12: Solutions

  • Identify the solute and the solvent in each solution composed of the following table:
 SoluteSolvent
10.0 g of NaCl and 100.0 g of H2O  
50.0 mL of ethanol and 10.0 mL of H2O    
0.20 L of O2 and 0.80 L of N2  
10.0 mL of acetic acid and 200. mL of water    
100.0 mL of water and 5.0 g of sugar  
5 g of Br2 and 50.0 mL of methylene chloride  
  • Water is a polar solvent and carbon tetrachloride (CCl4) is a nonpolar solvent. In which solvent is each of the following more likely to be soluble?
    • NaNO3, ionic
    • I2, nonpolar
    • sucrose (table sugar), polar
    • gasoline, nonpolar
    • vegetable oil, nonpolar
    • benzene, nonpolar
    • LiCl, ionic
    • Na2SO4, ionic
  • Indicate whether solutions of each of the following contain only ions, only molecules, or mostly molecules and a few ions. Write the equation for the formation of a solution for each of the following:
    • Na2SO4(s), a strong electrolyte
    • CH3OH(l), a nonelectrolyte
    • NH4OH(l), weak electrolyte
  • Classify the solute represented in each of the following equations as a strong, weak, or nonelectrolyte:
  • Define the term solubility. How it is affected by the temperature.
  • Predict whether each of the following salts is soluble in water and explain why:
  1. Na3PO4
    1. CaCO3
    1. K2S
    1. Ca(NO3)2 
    1. PbCl2
    1. NaOH
  • What is the difference between a 5% (m/m) glucose solution and a 5% (m/v) glucose solution?

  • Calculate the mass percent 1m>m2 for the solute in each of the following:
    • 75 g of NaOH in 325 g of NaOH solution.
  • 2.0 g of KOH and 20.0 g of H2O
  • 48.5 g of Na2CO3 in 250.0 g of Na2CO3 solution
  • Calculate the mass/volume percent (m/v) for the solute in each of the following:
    • 2.50 g of LiCl in 40.0 mL of LiCl solution
  • 7.5 g of casein in 120 mL of low-fat milk
  • A bottle of champagne is 11% (v/v) alcohol. If there are 750 mL of champagne in the bottle, what is the volume, in milliliters, of alcohol?
  • Calculate the molarity of each of the following:
    • 0.500 mole of glucose in 0.200 L of a glucose solution
  • 73.0 g of HCl in 2.00 L of a HCl solution
  • 30.0 g of NaOH in 350. mL of a NaOH solution
  • Calculate the final concentration of each of the following:
    • 2.0 L of a 6.0 M HCl solution is added to water so that the final volume is 6.0 L.
  • Water is added to 0.50 L of a 12 M NaOH solution to make 3.0 L of a diluted NaOH solution.
  • A 10.0-mL sample of a 25% (m/v) KOH solution is diluted with water so that the final volume is 100.0 mL.
  • A 50.0-mL sample of a 15% (m/v) H2SO4 solution is added to water to give a final volume of 250 mL.
  • Identify the following as characteristic of a solution, a colloid, or a suspension:
    • a mixture that cannot be separated by a semipermeable membrane
    • a mixture that settles out upon standing
    • Particles of this mixture remain inside a semipermeable membrane but pass through filters.
    •  The particles of solute in this solution are very large and visible.
  • Are the following solutions isotonic, hypotonic, or hypertonic compared with a red blood cell?
    • distilled H2O
    • 1% (m/v) glucose
    • 0.9% (m/v) NaCl
    • 15% (m/v) glucose
  • 1% (m/v) glucose
  • 2% (m/v) NaCl
  • 5% (m/v2) glucose
  • 0.1% (m/v) NaCl
  • Indicate the compartment (A or B) that will increase in volume for each of the following pairs of solutions separated by a semipermeable membrane:

Classwork Chapter 13:

Reaction Rates and Chemical Equilibrium

  1. What is meant by the rate of a reaction?
  • Why does bread grow mold more quickly at room temperature than in the refrigerator?
  • How would each of the following change the rate of the reaction shown here?

2SO2(g)+O2(g)→2SO3(g)

  • adding some SO2(g)
  • increasing the temperature
  • adding a catalyst
  • removing some O2(g)
  • decreasing the temperature
  • What is meant by the term reversible reaction?
  • When does a reversible reaction reach equilibrium?
  • Write the equilibrium expression for each of the following reactions:
  • CH4(g)+2H2S(g) ⇄ CS2(g)+4H2(g)
  • 2NO(g) ⇄ N2(g)+O2(g)
  • 2SO3(g)+CO2(g) ⇄ CS2(g)+4O2(g)
  • CH4(g)+H2O(g) ⇄ 3H2(g)+CO(g)
  • What is the numerical value of Kc for the following reaction if the equilibrium mixture contains 

CO2(g)+H2(g)⇄CO(g)+H2O(g)

  • 0.30 M CO2          0.20 M CO
    • 0.30 M H2O      0.033 M H2
  • Indicate whether each of the following equilibrium mixtures contains mostly products or mostly reactants:
  • Cl2(g)+NO(g)  ⇄  2NOCl(g)   Kc=3.7×108
  • 2H2(g)+S2(g)  ⇄  2H2S(g)   Kc=1.1×107
  • 3O2(g)  ⇄  2O3(g)   Kc=1.7×10-56
  • Ammonia is produced by reacting nitrogen gas and hydrogen gas.

N2(g)+3H2(g)⇄2NH3(g) ∆H= +92 kJ

For each of the following changes at equilibrium, indicate whether the equilibrium shifts in the direction of product, reactants, or does not change:

  1. removing some N2(g)
  • decreasing the temperature
  • adding more NH3(g)
  • adding more H2(g)
  • increasing the volume of the container
  • adding a catalyst
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