SCIENCE HELP!!??

Hello


My question which is making me totaly confused is that my teacher has given me the test for starch slightly different to what the bbc website had gave


The bbc website says :


First of all you add the leaf into boiling water in order to kill it. Then you put it in a warm bath of alchol that removes the chrorphyll which is the green colour. Then you dip it into water to soften it and then pyut it in a white tile and add 2-3 drops of iodine, if starch is present than it will turn blue-black.


For my tracher's explanation

it was :

1- Drops leaf in boiling water
This stops all further cell activity and allows substances to mive into the cell easily.

2- Put the leaf into a boiling water bath in a tube filled with ethanol. This removes the chlorophyll so you can see the colour change more easily. The leaf goes white and goes crrispy/stiff.

3- It is soften by dipping the leaf in hot water.

4- Add iodine to test after spreading leaf on a flat white tile.




Do I add ethanol or alchol to take off the colour I am totaly confused can anyone tell me please which is the right cause my sats are comin

thankyou

Both are right. YOu have a water boiling bath. Put your leaf into a test tube filled with ethanol. Now dip the tube of ethanol into the hot water. The ethanol is warmed by the water, and the ethanol dissolves the cholorphyl. This is a better method for removing than the BBC site: ethanol will dissolve much better than just hot water. However, if you choose to skip the ethanol, just dip the leaf in hot water, enough should come out to see the iodine reaction.

asked by Blossom

Respond to this Question

First Name

Your Answer

Similar Questions

  1. science

    Do you think, based on knowledge, that the portrayal of anthropology in the media is correct and/or appropriate in this article Cambridge-based scientists develop 'superwheat' Website: BBC News
  2. science

    Do you think, based on knowledge acquired in this module, that the portrayal of anthropology in the media is correct and/or appropriate in this article Cambridge-based scientists develop 'superwheat' Website: BBC News
  3. English

    I am new and I have questions. Are there any teachers in this website? If there are teachers in this website WHAT ARE THEIR NAMES? I could write to them in this website when I need help with my homework LIKE: Name:Kaveri Subject:
  4. Website Question

    Will the website be supporting pictures soon? like take a pic of your problem then upload it to the website then someone will try and solve it?
  5. General question

    What is difference between people lives of Iraq and the way we live. These sites have information about life in Iraq. (Broken Link Removed) http://news.bbc.co.uk/2/hi/in_depth/middle_east/2006/life_in_iraq/
  6. Question for Mrs.Sue help

    Mrs.Sue I posted a question on this website with my answer I wrote looking for help with my grammar before I turned it in and the teacher found on this site and I told him I posted it but, he won't give me credit for it unless it
  7. Finance

    Which one of the following account login credentials (username and password) is most important to keep secure? a.Primary Email account b.Credit Card website c.401(k) website d.Bank website e.Mortgage website I pick d Because this
  8. Math

    Donald Trump purchased a large box of his own books for $55,000. He gave 25 of the books to other republican nominees and then sold the rest on an Internet website for $63,000, making a profit of $15 on each one. a) How many his
  9. English

    Can you please tell me if the following sentences regarding school rules are possible? Thank you. 1.You are not allowed to enter the school building after ten o’clock. 2.School starts at five to eight. Remember to arrive to
  10. teacher aide

    Name and provide the website address of the National OHS organisation. Visit their website and download a piece of information relevant to your workplace. Please help thanks for your time!

More Similar Questions