Wednesday June 5th - Sun Safety Lab

Problem/ Question:How well do different materials protect the skin from the sun?

Students working on their Sun Safety Lab.

Colts Soccer Jersey Being Tested

LLBean UV rated shirt tested against Regular Cotton Shirt.

HMS Students confirm the 40+ UV rating of the LLBean Shirt!

(Control strip on left, shirt showing UV rays being blocked on right, full exposure in center).

Amazing Respiratory Link and Tuesday's Respiratory Lab

Click here for an amazing respiratory link.

Today's Lab - Respiratory System
Access by clicking here

Pig Heart Dissection- Wednesday May 1st

Please take some time and look over the Pig Heart Dissection powerpoint below.

Pig Heart Dissection Powerpoint

This will be just like the one we will complete on Wednesday.  Be familiar with the names and parts.

Friday, April 5, 2013

Yeast Fermentation Lab!

Scientists,

Well done today with the lab despite the fact that we did not see the results as quickly as we might have thought.  Some of your labs actually came out quite well!  Unfortunately you were all out the door and starting your weekend fun before you could see it!!

Good science means that we are always "tinkering and experimenting" for ways to get results with our labs.  Why do you thi nk we saw faster results when we added heat and more yeast to the beakers?  We can explore this more on Monday!

For those of you who would like to get a head start on the Post Lab Analysis here is an image of what your beakers looked like before the fermentation took place and what they looked like after:

BEFORE:

AFTER:

Click on the images to enlarge them, but from left to right it is the water, the Powerade, the fruit punch, and the Hi-C.

Enjoy the weekend and be sure to email Mr. Greg with any questions you might have about the lab or the comics!

  

Yeast Fermentation Lab

Greetings Scientists,

On Friday you will be conducting an experiment to observe the evidence of yeast activity.  Before performing the lab, you must take the time to answer the Pre-Lab Questions from the handout given to you today in class.  The link to the reading "Chapter 15-Investigating Fungi II--Yeast" will help you answer these questions.  Be sure to read pg. 180-182 and the Lab Instructions!

Chapter 15-Investigating Fungi II--Yeast

The Pre-Lab Questions must be completed by the start of class on Friday for you to do the lab.

Good Luck!

Stomata Lab Sheet

When you have finished your scientific drawings....

Click on the following link to reflect and answer the Pots-Lab Analysis questions:

Stomata Lab Sheet

March 27th - Stomata Lab

Here are images of the Kale leave under 400 magnification.  The circled items are the stomatal openings on the leaf.  What do you think is happening when they are open?

Egg Osmosis Lab

Here is the link to the Egg Osmosis Lab if you want to attempt it.
Download the directions here.

March 14th - Onion Cell Osmosis Lab

Here is the lab we completed today looking at osmosis and red onion cells.
Click here to access lab.

Background:

A substance that dissolves in another substance is called a solute, and the more plentiful substance that does the dissolving is called the solvent.  In living things, water is the solvent.  The mixture of solute and solvent is called a solution. Solute and solvent tend to diffuse from areas where their concentration is high to areas where their concentration is lower.  When water moves from higher concentration of water to lower concentration of water through a cell membrane, it is called osmosis. 

Here is the cell before the salt solution was added.

Here is the cell after the salt solution was added.

Notice the decrease in size of the vacuole as the water is diffused out of it.

March 12th - Diffusion Lab

Today we completed a lab on diffusion.

The essential question was - How do cells move molecules in and out of their membranes?

Here is the Introduction of the lab:

In this lab you will observe the diffusion of a substance across a semi-permeable membrane. We will model cell membranes using a plastic bag and explore movement of molecules when we change the concentration of substances.  Iodine is a known indicator for starch. An indicator is a substance that changes color in the presence of the substance it indicates. 

Here is a link to the lab.

Here are some photos of the before and after.  The iodine diffused through the bag and reacted with the starch turning it purple!

Students need to complete the post-lab for homework.