Wednesday, November 9, 2011

Exam Review Question!!

Question: What is the difference between a solution and a heterogeneous mixture? A pure substance and a mixture? A solution and compound? Give examples of each. Overall give 5 examples of heterogeneous mixtures and 5 examples of homogeneous mixtures?

             There are many ways to distinguish between mixtures of elements, including homogeneous, heterogeneous, solutions etc. A heterogeneous mixture is a mixture whose composition is not uniform throughout. A solution, also known as a homogeneous mixture, is a mixture where the composition is uniform; either all solid, all liquid or all gaseous. An example of a heterogeneous mixture is Campbell's chicken noodle soup and an example of a solution is gasoline. The difference between a pure substance and a mixture is that a pure substance has a fixed composition and a mixture's composition varies depending on the product. An example of a pure substance would be something like a bar of soap and a mixture would be milk. Milk can have different amounts of calcium and fat while soap usually will have the same amount of all its ingredients. A solution is different than a compound in that a solution can only be homogeneous while a compound can only be heterogeneous because they are substances. A solution would be water while a compound could be something like gushers, a blueberry bagel, or body wash with moisture beads. A compound could be anything from salt to cotton.



  1. Good work! In case you wanted some more examples... Salt water is also a solution/homogeneous mixture. Trail mix is another example of a heterogeneous mixture.

  2. The post was quite complete, but the first sentence was quite confusing because you started to talk about heterogenous mixtures and then said also known as homogenous mixtures and began to talk about those types of mixtures. also your examples were good strong examples for each. Overall I can see you worked hard on this post. Besides the first sentence which was pretty coinfusing, it was a good post.

  3. Good post, it tells all the information needed well, except for the first part. A tip would be to write a 'topic sentence'. Maybe sum up what you are going got talk about or write a short into. But when you dive into it, it makes it harder to get it. But you still get everything in there. Good job with coming up with good examples.

  4. Great post! I really liked the examples that you used, and I think that you explained the concepts clearly. The only thing that I would suggest is to rephrase your first sentence in your answer, because I was a little confused at first and had to re-read it a few times to understand what you were saying. Overall, it was a great post and explained the concepts well!

  5. Great job, Nicole! You did wonderfully, although there are a few mistakes. You may want to add that solutions can be gaseous as well as solid or liquid. The “it’s” in the sentence about milk should be its, and I tend to think that the amount of fat varies more between different types of milk than the calcium content does. In the last bit, you said that the only difference between a compound and a mixture is that a solution has to be homogeneous, and a compound could be either heterogeneous or homogeneous. But this is wrong! You seem to have confused compounds and mixtures. Compounds are substances, so they have a uniform composition throughout, and cannot be heterogeneous. This also means that the examples you gave for compounds are actually all mixtures. Other than these small errors, your post was great! I especially loved your upbeat attitude. 