Science Help!

Johhny left a glass of milk on his bedside table for a week, and it spoiled. At the end of the week, the glass contained a yellow liquid with white chunks, and there was a terrible odor. What can be concluded?
A. The milk has undergone a physical change.
B. The mass of the milk before the change is less than the mass of the milk after the change.
C. Milk only forms ionic bonds
D. The milk has undergone a chemical change.
Is the answer A?

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asked by Callie
  1. I agree with A.

    B doesn't seem like the answer.

    Both C and D also don't seem like the answer either.

    So yes, I believe that A is correct for the problem.

    I hope this helps! :)

    P.S. I will try to keep on helping you(When I can). That, I believe may be the only way to talk on here. Same with other posts related to school it seems.

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    posted by Brady
  2. Thanks:(

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    posted by Callie
  3. You're welcome, Callie.

    P.S. One day in the future we can talk as friends for sure. Right now, it doesn't seem like we can. Sorry! :(

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    posted by Brady
  4. I guess I will have to keep using jiskha for 4 more years, til im 18. Huh, I really do appreciate the help, school is tough.

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    posted by Callie
  5. Yeah, same with me. School is "always" tough.

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    posted by Brady
  6. my teacher says that although im in 8th grade im learning 10th grade schooling.

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    posted by Callie
  7. Yeah, it's almost the same for me. I am in 9th grade, learning like a 12th grader.

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    posted by Brady
  8. A is not the right answer. Look up the difference between a physical change and a chemical change.

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  9. Ok is the answer D?

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    posted by Callie
  10. DrBob222 is right, spoiling milk is a chemical reaction, not a physical reaction. Sorry! I did try though.

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    posted by Brady
  11. Yeah, I would think D.

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    posted by Brady
  12. D is correct.

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  13. No cheating kids

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  14. thanks if you feel its cheating get off the site!

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    posted by New kid
  15. Brady and Callie, there are other websites if you want to communicate with each other so other people don't see your conversations. One I use is Peeranswer. com It's a learning website as well, so you can help eachother out with questions and you can talk privatly. And yes D is correct.

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  16. yes the answer is D thanks for all the help.

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    posted by alyssa
  17. "DrBob222" why would you break up their conversation it was cute (lol) have Ur brothers back he was "trying" to flirt with Callie lol

    P.s i messing with you so don't take it personally i don't get out much :)

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  18. plus I'm a sucker for a good long-distance never met before story and I think that one day when u 2 really meet after 4 years of typing to each other on a homework help site..... that ur gonna be great friends!!!

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  19. and I think you should listen to "Anonymous" so you guys can talk :)

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