# Required changes

Hi folks,

I have had the opportunity to look over your work and I have suggestions:

## Primary biological content area covered

be more explicit and make the link between sunlight energy driving chemical reactions that convert CO2 into carbon compounds with an O2 waste product.

## Teacher materials

• Be more specific in listing the Tap water conditioner.
• Give the brand we used and state the reason for using it.
• Move photographs of the glassware, and the home made versions up. Give each image a caption and number them: Figure 1. An inverted baby food jar.....etc. In this way you refer to the photos by number in your description of the activity.
• Add photographs of the construction paper cutouts; also make this a job for the children rather than the teacher (obviously in our 20-minute session this is impractical, but few teachers would have time to make the cutouts and the scissors practice is good for young hands and minds)

## Handout

• q 4 is vague; q 5 provides the answer; perhaps you need a more leading question in this case; provide a word bank at the bottom for emerging readers and writers. In it's current form the handout may be intimidating for the average grade 2 student

## lesson plan

• refer to the figures by number (see above).
• Don't make the bicarbonate seem optional; very briefly describe the chemistry happening here and perhaps find a chemistry resource on wikieducator to back this up
• Fiery demonstration
• With glass tubes or baby food jars, I doubt hat the gas will float the tube. It will displace the water however.
• Replace sun with light source; Make a connection to the first law of thermodynamics for higher grades
• Point out that the match demo requires a full tube of oxygen or air dilutes the effect. An alternative is to place a thumb over the still submerged tube, invert it, and then you have water on the bottom, and nearly pure oxygen on top; try it, it may work. However, unless we have healthier plants, this piece may have to be dropped or changed to a suggestion
• creating diagram; space needed after arrows

## Pitfalls

• add suggestion above as a solution. In general, offer suggestions for dealing with pitfalls

## work on next steps

aquarium, plants, what else can be done? Fish habitat? compost? It is important to point out that purchased organisms should NEVER be released to the environment.

## Standards

This section looks great. Keep up the good work.

Dmccabe 19:27, 2 February 2009 (UTC)

07:27, 3 February 2009