Mr. Bouyer

Day 1 | Day 2 | MWJH Science Goals Concept Mapping

a mad scientisit

 

 

 

 

Percentage of Water
In Magnesium Sulfate

Objective: The objective of theis lab is to give you practice with common lab techniques that will be used in High School.

Materials: Triple Beam Balance, Bunsen Burner, Ring Stand, Wire Gauze, Watch Glass, Beaker, Magnesium Sulfate.

Procedure:
1. Weigh your watch glass and write the weight in your data section.
2. Weigh your beaker and write the weight in your data section.
3. Obtain a small sample of magnesium sulfate in your watch glass from Mr. Bouyer.
4. Weigh the watch glass and chemical and write the weight in your data section.
5. Subtract the weight of the watch glass from step 4. This will be your chemical's beginning weight. Write this weight in your data section.
6. Transfer the magnesium sulfate from your watch glass to the beaker.
7. Gently heat the magnesium sulfate until Mr. Bouyer says stop. You have just "dried" the magnesium sulfate.
8. Let the beaker and chemical cool.
9. Weigh the dry chemical and beaker and write the weight in your data section.
10. Subtract your original beaker weight and you'll get the weight of your dry chemical. Write the weight of your dry chemical in your data section.

Data:

1. Wt. of watch glass _____ grams
2. Wt. of beaker ______ grams
3. Wt. of watch glass and Chemical _____ grams
4. Wt. of chemical (step 3- step 1) _____ grams

After Heating

5. Weight of beaker and dry chemical _____ grams
6. Subtract step 2 from step 5 _____ grams. This is your dry chemical weight.
7. Subtract step 6 (dry chemical wt.) from step 4 wt. of chemical. _____ grams. This is your weight loss.


8. Wt. loss (what you got in step 7) divided by wt. of chemical (step 4) = _____ This is your percent of water in magnesium sulfate.

Day 2

Importance of Lab Safety
  1. Use the MWJH Science Goals Pagelink to a local webpage to answer the following questions.
    1. Define critical thinking.
    2. Use the self-evaluation criteria to determine which of the following is an "A" statement, "B" statement, and "C" statement.
      • Mineral Wells Junior High School is known for technology, hard working students, and sports.
    3. What are the four basic class rules in MWJH science classes?
    4. Explain what is meant by the last statement on the MWJH science goals page?

click to find the answer to today's question What is the main threat to safety in our lab?

eye protection required Laboratory experience is essential in all science classes. Experiments are carried out to test a hypothesis formed through researching a particular problem. Although the results of an experiment should not come as a complete surprise, you must always be prepared for the unexpected. For this reason, safety is always a concern with any lab. To insure that you and your classmates will not be injured in science class, be very familiar with the MWJH science lab safety procedures.

The laboratory equipment used in this class is not complex, but each piece of labware has a specific purpose and should be used properly. This not only protects the equipment, it also improves safety in the lab.

Most of the chemicals used in Science Class will be diluted to the point that they are not immediately dangerous. However, care should be taken not to get chemicals on your skin and clothing. Every chemical has its own special properties that require certain precautions. Material Safety Data Sheets are available for every chemical in the MWJH chemical inventory. While there is a link to this inventory on the science homepage, this symbol material safety data sheets will be found on several weekly concept pages. It is linked directly to the chemical inventory and MSDS.

Test Your Concept Understanding:

    Use the MWJH science lab pagelink to a local webpage to answer the following safety questions.

  1. What PPE must always be worn when you are working at a chemistry lab station?
  2. What is the most common accident in the science lab?
  3. A glass beaker is dropped, shattering over your lab table. What are you to do?
  4. Is sodium hydroxide a carcinogen (an agent that cause cancer)?
    The answer to question #4 is on the material safety data sheet, MSDS, for sodium hydroxide.

    Use the lab equpimentlink to a local webpage page to answer the following

  5. What is the most versatile piece of glassware at our chemistry lab stations?
  6. Read the lab technique for measuring the volume of a liquid with a graduated cylindar. What volume is represented by this picture of a 10 milliliter graduated cylindar? link to a local picture
  7. What is the purpose of the "bumper ring" on a graduated cylindar?
  8. A "striker" is used to light a laboratory burner. What is it "not" used for?
  9. Where is the "hottest part" of a laboratory burner flame?

Concept mapping: link to a local picture

A concept map is a way of organizing and describing related ideas. Concept maps can be drawn in many different ways. What is important is that yours has meaning to you and helps you understand the information gained during research.

The map begins with the central topic or theme of the research. This central theme is then broken down into important areas. Each of these areas might be broken down as well, depending on the complexity of the research topic. Once the map is complete, you have identified the areas that will be used in reporting your research.

A concept map is provided for each week of class, with the basic theme at the bottom of the page. While these maps might not represent an assigned research topic, they do serve as examples as you learn to make your own concept maps and use them in your research.

Demonstrating technology skills:link to a local webpage

Citizens of the twenty first century must be able to use technology. You have already learned to use many tools of technology at Mineral Wells Schools. Science students are expected to use these tools when doing their science assignments. This site provides much of what you will need to be successful this year. It is important that you study the student pagelink to a local webpage that explains how to use the MWJH science curriculum.