Science Experiments

Posts Tagged ‘data’

Question: Im want to a science fair project on the effect of PBCS on our water systems or ponds…but?

i dont know how to set up a testable experiment. im really clueless here, so any help provided would be appreciated. How could i test this in a manner that answers the question?
or would this question be more feasible: What effect does the presence of phosphates have, if any, on the oxygen level of water in a pond?

Answer: Go with phosphates/oxygen.

our completely dangerous science experiment

Question: Science experiment – glucose, amylase – help?

We carried out an experiment to see the effects of amylase on starch solution.

But I am confused with the method and results/analysis.

This is the method:

Visking tube – 3 parts amylase to 1 part starch
Put in a beaker of water for 15 minutes
After 15 minutes added a small amout to spotting tile with drop of iodine.
Next, took a test tube and added Benedict’s solution to a mixture of amylase and starch solution.
Placed in water bath for 15 minutes.

Is this correct? I am confused on what the analysis/results are.

Help is much appreciated.

Thank you!
Am I right in thinking that there was no starch present in the beaker of water as when tested with iodine – it turned blue/black = no starch present. The molecules were too big?

Answer: Basically – the amylase hydrolyses (breaks down) the starch down into mono- and disaccherides.

You test with iodine to demonstrate the presence or absence of starch. If it turns blue/ black, there IS starch present. As the starch is is broken down, you will not get the colour change.

Benedicts solution is used to test for the presence of reducing sugars, including all monosaccharides and the disaccharides mannose, lactose and maltose. In other words you are using it to test for the PRODUCT of the hydrolysis of starch by amylase.

I suspect the beakers of water may have been to do with maintaining particular temperatures to allow the amylase and Benedicts reagent to work properly.

If I follow your description you should have got:
Start – starch turns blue/black with iodine
Mixed with amylase and incubated for 15 mins
Test with iodine again. You should have got less or no reaction with the iodine as the starch would have been hydrolysed to sugars.
You then test with Benedicts solution. If you got a red, green or yellow precipitate, it indicates the presence of reducing sugars showing that the starch has been hydrolysed to sugars (ideally in a perfect world you’d have testing your starting starch solution with Benedicts to show that you didn’t have sugars in there to start off with).

CNN Finally Reports on Dispersant Corexit ‘science experiment’

Question: help on science experiment?

i have to design an experiment to test a enviromental factor on plant growth. i have to include a hypothesis, control, data table, and a graph… i do not kno wat to do so please help me
make sure i can do the experiment in a few hours
and i also need to be able to design with common household objects

Answer: for plant growth you need at least a couple days for most experiments try putting two plants in seperate rooms with no windows and the lights on, make sure both rooms have the same conditions, measure how tall they are then put a different kinds of music in each room after a while measure how tall they are again.

Video 4: GED as Project: Graphing – Science Practice Test