dioxide made by the yeast at the medium or high dose, so the bleach might have killed the yeast. Salt was the second most toxic chemical mixture, but carbon dioxide was still made, so the salt didn’t kill all the yeast. We compared everything to our control bags. The control bags tell us what the yeast would do under normal conditions. The use of a control is very important because it helps us figure out if anything interfered with our experiment. For example, if we added water that was too hot, it would have killed the yeast. If our control bags didn’t produce any carbon dioxide, we would know something was wrong with the yeast. Other variables that could have been important were the time the experiment lasted and the temperature of the room (yeast needs to stay warm). When we analyzed our results, we were surprised that yeast plus baking soda made more carbon dioxide. Instead of being toxic, the baking soda helped the yeast make more carbon dioxide. Even though we used the same for all the chemicals, we saw different responses at each dose. That means that the dose alone doesn’t mean a chemical is harmful. We see this in our lives. We can drink 8 glasses of water in a day, but 8 glasses of soda would give us an upset stomach. To figure out if a chemical is harmful then, we have to test many different doses.
dioxide made by the yeast at the medium or high dose, so the bleach might have killed the yeast. Salt was the second most toxic chemical mixture, but carbon dioxide was still made, so the salt didn’t kill all the yeast. We compared everything to our control bags. The control bags tell us what the yeast would do under normal conditions. The use of a control is very important because it helps us figure out if anything interfered with our experiment. For example, if we added water that was too hot, it would have killed the yeast. If our control bags didn’t produce any carbon dioxide, we would know something was wrong with the yeast. Other variables that could have been important were the time the experiment lasted and the temperature of the room (yeast needs to stay warm). When we analyzed our results, we were surprised that yeast plus baking soda made more carbon dioxide. Instead of being toxic, the baking soda helped the yeast make more carbon dioxide. Even though we used the same for all the chemicals, we saw different responses at each dose. That means that the dose alone doesn’t mean a chemical is harmful. We see this in our lives. We can drink 8 glasses of water in a day, but 8 glasses of soda would give us an upset stomach. To figure out if a chemical is harmful then, we have to test many different doses.
radish_seed_dose_response_worksheet_-_teacher_key.docx