BIO 2101 all 08-30-2023

Announcements

Upcoming Long Weekend

• No classes on Monday or Tuesday.

• The college will be closed on Monday, but will open on Tuesday, although there will be no classes scheduled.

• No labs will be held next week, allowing students to focus on self-study and preparation.

Class Reminders

• Track your class schedules carefully and ensure participation in labs. This is especially important for students who attend classes on Monday/Wednesday and Tuesday/Thursday, as they need to remain aware of any missed lab opportunities.

• Utilize the long weekend for relaxation and to catch up on any missed work, particularly in labs and histology material, which may contribute significantly to quiz preparations.

Preparation for Quiz 2

• Focus specifically on the following topics:

  • Intravenous Fluids: Understanding types and uses of IV fluids in clinical settings.

  • Math and Problem-Solving Skills: Develop comfort with calculations that may appear on the quiz.

  • Consider practical examples such as currency conversion and distance measurement in different units to solidify understanding of real-world applications.

  • Emphasize becoming confident in solving real-life problems that involve solutions and concentrations.

Key Concepts for the Quiz

Cell Concentration:

• Have a firm grasp on isotonic solutions, as cells typically prefer isotonic environments to maintain optimal shape and function.

• Familiarize yourself with the characteristics of isotonic solutions:

  • 0.85% sodium chloride solution

  • 5% glucose solution

Understanding Percent:

• Remember that percent refers to parts per 100. For example, if a quiz has 33 questions and a student misses 2, the percentage grade can be calculated as follows: (31/33) x 100 = 94%.

• Understand how to accurately calculate grades based on the total number of questions and those answered correctly.

Calculating Concentration:

• Use this formula: Percent = (grams of solute / 100 mL of solution). This will help in various calculations regarding solutions' strength.

• Distinguish clearly between solute (the substance that is dissolved) and solvent (the substance that dissolves the solute). For example: to prepare a 5% glucose solution, accurately measure the required amounts:

  • 5 grams of glucose for every 100 mL of total solution.

Important Equations to Remember

• The basic equation for calculating concentration: Grams of solute over 100 mL = Percent concentration. This is foundational for upcoming practical evaluations.

Solution Creation:

• When preparing solutions, remember that total volume = volume of solute + volume of solvent. It is crucial to note that adding solute will displace some volume of solvent (for instance, water).

Molarity:

• Definition: Molarity is defined as moles of solute / liters of solution. Understanding this concept is critical for effective laboratory work.

• Remember, 1 mole of a given substance is equivalent to its molecular weight in grams. This can help in transitioning between grams and moles.

• Be capable of deriving molarity from grams with this formula: grams / molecular weight = moles.

Examples for Practice

Percent Calculation:

1. Given 4 grams of fructose in 100 mL:

   • Answer: 4% concentration.

2. Given 3 grams in 50 mL:

   • Answer: 6% concentration.

3. Given 1 gram in 10 mL:

   • Answer: 10% concentration.

Molarity Calculation:

1. With 360 grams of fructose in 1 liter:

   • Molarity = 360 grams / 180 grams (molecular weight) = 2 moles.

2. Given 29.46 grams of magnesium bromide in 500 mL:

   • Calculate the molarity based on the molecular weight obtained from the periodic table.

Study Resources

• Access online resource modules on D2L specifically designed for practice quizzes.

• Use calculation tips documents effectively for quiz preparation.

• Review all materials comprehensively before quiz day to reinforce understanding and retention of concepts.