if other things like milk, egg whites, bread, chicken, and milk contain sugar, protein, and starch?
2006-12-10 06:27:56 · 3 answers · asked by Me<3JB 2 in Science & Mathematics ➔ Other - Science
A negative control is used to show that your test, eg your test for sugar, works. If you got a positive result for water, it would show that your test was faulty, and you could not trust your result for bread.
A better test would include pure sugar as a positive control, to show what the positive result looks like.
2006-12-10 10:08:04 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Your teacher has failed miserably to teach you what a "control" is. Or perhaps you just weren't paying attention.
You would use water as the control because you already KNOW it doesn't contain any sugar, protein or starch. Whenever you measure anything, you have to have a point you are measuring it FROM.
2006-12-10 14:51:36 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The watter will be used because it will return a zero reading for any of those ingredients
2006-12-10 14:37:38 · answer #3 · answered by Gene 7 · 0⤊ 0⤋