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MERLOT II


    

Peer Review


Dilutions

by Cecilia Yu , CarolAnn Paul
 

Ratings

Overall Rating:

4.75 stars
Content Quality: 4.75 stars
Effectiveness: 4.75 stars
Ease of Use: 4.75 stars
Reviewed: Feb 27, 2013 by Biology Editorial Board
Overview: Practice problems on how to perform dilutions. Dilution is one part of a larger web page called Biological Assays within Biology Concepts, but it addresses a very fundamental chemical concept that impacts biology in a significant way. It addresses basic volume-concentration dilutions as well as more complex Serial dilutions. Several important laboratory concepts such as making solutions and buffers are also addressed.
Learning Goals: None specifically stated. Site covers: How to do the calculations to set up the dilution How to do the dilution optimally How to calculate the final dilution
Target Student Population: High school or undergraduate.
Prerequisite Knowledge or Skills: Some basic understanding of volume and solutions would help, but are not necessary. Basic biology or chemistry.
Type of Material: This web site offers text and video animations to deliver the instructional material. Tutorial on performing dilutions.
Recommended Uses: Supplementing classroom instruction and independent study. Out of class or lab practice.
Technical Requirements: HTML and Quicktime.

Evaluation and Observation

Content Quality

Rating: 4.75 stars
Strengths:
  • Well designed
  • Simple format and well-organized
  • Conservative use of text helps explain the material without looking like an e-book
  • Presents a good application of a difficult concept for students
  • Provides an opportunity to learn theory and perform applications
  • Content is current and accurate
Concerns:
  • Limited number of types of dilution problems

Potential Effectiveness as a Teaching Tool

Rating: 4.75 stars
Strengths:
  • Concepts are distilled down into digestible learning blocks.
  • Starts with simpler concepts and builds up to more complex concepts
  • Video animations help keep students attention
  • Question and quizzes increase the learning experience
  • Would be a good out of class assignment for students struggling with dilutions
  • Provides theory, practice problems and answers
  • Could be used to generate assignments
Concerns:
  • On my computer the videos were a little small. This could be a strength if the user has a smaller monitor
  • Problems are somewhat simple--more examples would be useful

Ease of Use for Both Students and Faculty

Rating: 4.75 stars
Strengths:
  • Very clear and easy to navigate
  • Loads easily
  • Easy to navigate
  • Fairly simple site
  • The text is well written
  • Practice problems well illustrated
Concerns:
  • Some animations did not run smoothly

Other Issues and Comments: None.