Materials and Methods:
50 paper cups were used for this experiment. 100 milliliters of room temperature water was put in each cup. 10 cups were set aside in 5 groups so that 10 cups were in each group. In the first 10 cups, 25 mL of Wesson vegetables oil was put into the cups. In the next 10 cups, 25 mL (5.07 teaspoons) of Morton salt was put in the cups. 25 mL of Tide laundry detergent was put in the next 10 cups, and 25 mL of Rutter’s 1% low fat milk was put in the next 10 cups. 10 cups with 125 mL of water was then left for the control. These 50 cups were put under 5 lights each with 5 new 60-watt light bulbs. The light was spaced out evenly so that each cup received the same amount of light. Each cup was measured once a day for depth of the substance and the average was found for each group twice a day. The experiment went on for 5 days.
Whould I change anything? My teacher asked how I can I tell that only the water evaporated and not the substances? Any input?
2007-11-27 12:19:35 · 5 answers · asked by fluorine DX4 3 in Science & Mathematics ➔ Chemistry
Would the substances evaporate? Does oil or tide evaporate?
2007-11-27 12:28:24 · update #1
by the way, I'm testing to see which substance best prevents the evaporation of water.
2007-11-27 12:37:34 · update #2
Do I measure both the water and the substances together or sepretly before the experiment??
2007-11-27 13:15:08 · update #3
> Would I change anything?
Yes. You need the mass of the substances, including the cups, not the volume.
After the water had all evaporated, you would then weigh the cups. If anything weighed less than when you started, then you'd know that the substance had evaporated and not just the water.
2007-11-27 12:24:16 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The fact that only water evaporated would be evident by the amount of liquid remaining in the cups being the same...Except for the one with the oil floating on it.
The oil would practically prevent the evaporation of the water.
2007-11-27 20:33:35 · answer #2 · answered by Norrie 7 · 0⤊ 0⤋
Hi. One way may be to allow ALL the water to evaporate and weigh the residual material. All but the pure water should weigh an amount equal to the original 25ml.
2007-11-27 20:23:39 · answer #3 · answered by Cirric 7 · 0⤊ 0⤋
place a cover or plate 10 Cm above
2007-11-27 20:22:02 · answer #4 · answered by Chris V 2 · 0⤊ 0⤋
buy containers with lids or sit and watch how much evaporates
2007-11-27 20:24:10 · answer #5 · answered by Zac Efron Lover!!! 2 · 0⤊ 0⤋