Monthly Archives: October 2012

10.31.12 pH and Carrot Osmosis

Happy Halloween!!!! I hope you have a safe and fun time tonight.

A few reminders:

****All students received their current grade sheets in class today. All missing and corrected work is due but Friday to receive credit. Please see me at lunch or BEST for help or check this blog for the assignments.

**** For periods 1, 3, and 5: your test is this Friday. The Hydro part 2 study guide 2012 DS is due tomorrow!!!! It will be checked at the beginning of class for completion. You may take your folder home to study from.

For periods 1, 3, and 5: your objective was to investigate the characteristics of pH and the tools used to measure pH. We started the lesson off with the pre-asssessment section of the acids-and-bases-notes. Then we followed the flip chart to describe the properties of acids (a substance that when added to water forms hydrogen ions (H+), corrosive, sour, pH less than 7, reacts with bases to form salts or water) and the properties of bases ( a substance that when added to water produce hydroxide ions (OH-), corrosive, bitter, pH greater than 7, slippery to touch, reacts with acids to form salts or water). We took a look at how to test pH (litmus paper , pH paper,,  and SPARKS probe , ) and tested some samples. Once we finished filling out the acids-and-bases-notes we watched 2 videos: Tim and Moby:  Acids and Bases and pH Scale (sligoms, brainpop). We finished the lesson by going over the pre-assessment statements from the warm up. Your homework is to complete the Hydro part 2 study guide 2012 DS.

For period 6: your objective was to model and investigate two ways molecules may be transported in and out of a cell. We jumped right into the lesson today and took a look at our carrot results, measuring the mass and testing the string’s  tightness around the carrot to see how it reacted to the salt and fresh water solutions. We then went through the summary and application questions of the Carrot Osmosis Lab 6th.  Your homework is to complete any missing work and turn it in by Friday.

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10.26.12 Cellular Respiration and Carrot Osmosis Lab

Good afternoon and happy Friday!

For periods 1, 3,  and 5 your objective was to analyze how organisms use sugar to create energy and to identify carbon dioxide as a product of respiration. We started the lesson off with solubility review. Then we went over CELLULAR RESPIRATION NOTES. Remember that both animal go through cellular respiration to break down glucose using oxygen to produce energy! Carbon dioxide is a gas waste product produced from this reaction. Then we took a look at our Cellular Respiration Lab day 2 results. We should have seen the following results:  Tube tube 1 should have remained blue, test tube 2 should have remained green and test tube 3 should have turned yellow . We added the active yeast to test tube 3 and as the yeast went through cellular respiration to extract energy  from the sugar, it produced carbon dioxide turning the indicator, Bromothymol blue yellow. If your results were different from what we expected, it could be the result of incorrect measurements, incorrectly adding the wrong ingredients, the warm bath could have been to hot or too cold. You were to turn in the questions to this lab as well as the exchanging-gases-concept-map. You also got your Hydro part 2 study guide 2012 DS. You are to work on this for homework. This will be checked for completion on November 1st. Your test is November 2nd and it will be a summative assessment. You are welcome to take your folder home to help you.

For period 6, your objective was to model and investigate two ways molecules may be transported in and out of a cell. We broke the lesson into 2 sections. Half of you worked with Mrs. Artis to complete the graph from our Speed of Diffusion Demo while the other half of you set up day 1 of the Carrot Osmosis Lab 6th. Then we switched. We went through the difference between diffusion and osmosis and set up our carrots in the salt water and fresh water solutions. Notice the carrot floats in the salt water but not the fresh water? What causes that? Tomorrow we will discuss this and find out whether the mass of our carrots changed in the different solutions. You do not have any homework 🙂

10.25.12 Cellular Respiration and Diffusion

Greetings! Was it just me or did today feel like it should have been Friday?

For 1st, 3rd, and 5th periods your objective was to analyze how organisms use sugar to create energy and to identify carbon dioxide as a product of respiration. We started the lesson with Identifying Mixtures Warm Up. Then we went over the answer to the exit card reactants-products answer key. Then we reviewed the three factors influencing solubility (movement of molecules: stirring, size of particles in the solute: surface area, and temperature of the solvent). Then we gave some examples of solutions and identified the solute and solvent used to create them ( Lemon and sugar for the solutes, water for the solvent to make the solution lemonade.) We discussed solutions create liquids not solids such as paper even though the process of paper making uses a solvent and solute, the final product is a solid.  Then we moved onto introducing cellular respiration with Brainpop: Cellular Respiration (sligoms, brainpop). All three classes had wonder questions about this process and how we use oxygen in our body. We finished the lesson by setting up the Cellular Respiration Lab for day 1 using  active yeast (heated) inactivated yeast (unheated), and, sugar Bromothymol Blue. We put our samples  in the hot water bath for 24 hours. We will check to see if the yeast broke down the sugar through the process of cellular respiration tomorrow. If the yeast did use the sugar as an energy source we should see a color change of the Bromothymol Blue indicator showing that carbon dioxide was produced, a waste product of cellular respiration. But why did we use test tube 1 with only sugar and Bromothymol blue but no yeast, what was the purpose of that? You do not have any homework tonight 🙂

Fro period 6, your objective was to explain how molecules move into and out of cells. We also started the lesson with con of mass warm up. Then we watched Tim and Moby explain Diffusion (username: sligoms, password: brainpop).We then talked about those crazy, hyper gas molecules, and how they like to spread out by asking our partner, do you smell it yet? Speed of Diffusion Demo. We will finish graphing the results tomorrow.

10.24.12 Mixtures, Solutions and Conservation of Mass, oh my!

 For periods 1, 3, and 5: Our objective was to investigate the solubility of a variety of substances in order to develop an understanding of the system by which plants absorb nutrients. We started the lesson with the COM Summary Card which you turned in. We then watched two videos to start our discussion of mixtures: Mr. Parr’s Separating Mixtures  and Brainpop: Compounds and Mixtures (sligoms, brainpop) We then went onto Mixtures and Solutions Notes while following the flipchart and investigated the solubility of hot chocolate powder versus chocolate chips  (remember solubility is impacted by temperature, size of the particles of the solute, and stirring). The molecules in any liquid are constantly moving. We can see this in an example of diffusion:  The food coloring molecules will move from and area of high concentration to an area of low concentration even without stirring. So any solute with start to dissolve on it’s own in a solvent if it is soluble. Mixtures are compounds that have not been chemically combined. Each of the ingredients keeps it own properties and the components can be easily separated: You do not have any homework tonight.

For period 6, your objective was to was to investigate the law of the conservation of matter in a closed system. We started the lesson off with Number element. Then we took some notes on the difference between a chemical and physical change using P and C change notes. Then we observed 2 chemical changes in the lab What goes in must come out. Does the mass of this closed system before the reaction equal the mass of the closed system after the reaction ? If not why not? Was our system perfectly sealed? How could we improve the experiment?

10.23.12 Carrot Osmosis Lab Day 2 and Assembling Raw Materials

Good afternoon! We are getting close to end of the first quarter. Please make sure that you have turned in all missing or corrected work by next friday, November 2nd. You will also have a summative assessment on November 2nd. You will get your study guide for this on Friday.

For Periods 1, 3, and 5 your objective was to analyze osmosis in a carrot in salt water and fresh water. We started the lesson with conservation of Mass Exit Cards. Remember that mass cannot be created or destroyed so how can mass change in chemical reaction? Molecules in the environment can increase or decrease the mass such as with rust and fire. We then went into day 2 of the Honey I Shrunk the Carrot Lab. We had some great observations about how the water molecules moved into the fresh carrot and out of the salt carrot. If you did not get a chance to finish the question, please get them done for homework and turn it in tomorrow.

For period 6: your objective was to model how the raw materials are used to make simple sugar molecules and prove the law of the conservation of matter. We started the lesson by going over # 2 and 3 from the summary on Constructing Models of Molecules. Then we moved into modeling photosynthesis by creating water and carbon dioxide molecules as the reactants and glucose and oxygen molecules  as the products using Assembling Raw Materials 6th. You do not have any homework tonight.

Modeling osmosis with carrots day 1 and constructing molecules

Good afternoon! Wow, what a wonderful trip we had on Thursday! You guys we fantastic and we hope you had a great time!

For periods 1, 3, and 5, your objective was to model and investigate two ways molecules may be transported in and out of a cell. We went straight into the Honey I Shrunk the Carrot Lab. We went through the difference between diffusion and osmosis and set up our carrots in the salt water and fresh water solutions. Notice the carrot floats in the salt water but not the fresh water? What causes that?  Tomorrow we will discuss this and find out whether the mass of our carrots changed in the different solutions. No homework tonight.

For period 6 your objective was to describe and model how atoms combine to form molecules and compounds. We started the lesson off with identify-each-unknown-as-a-compound. Then we moved onto watching two videos: What is Matter? and What are Molecules? We used this information to complete part one of Constructing Models of Molecules. Then we drew and constructed water molecules:  We discussed the difference between a physical and chemical bond

10.17.12 Diffusion

Good afternoon! Are you excited for the field trip tomorrow?! It should be a lot of fun! Remember cameras are ok but no music, this is still a school event.

For period 3, your objective was to explain how molecules move into and out of cells. We also started the lesson with Conservation warm up and then watched Tim and Moby: Conservation of Mass (sligoms, brainpop) as a review. Then we watched Tim and Moby explain Diffusion (username: sligoms, password: brainpop).We then talked about those crazy, hyper gas molecules, and how they like to spread out by asking our partner, do you smell it yet? Speed of Diffusion Demo. Tonight’s homework is SR Elements Found in Living Things.

For periods 1 and 5, your objective was to explain how molecules move into and out of cells. We also started the lesson with Conservation warm up and then watched Tim and Moby: Conservation of Mass (sligoms, brainpop) as a review. We then went over the data we collected in the  Speed of Diffusion Demo and graphed out results. We then saw how diffusion works with liquids: . You then worked with a partner to complete Diffusion Vocabulary. You do not have any homework 🙂