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?

thanks if you feel its cheating get off the site!

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.

Yeah, same with me. School is "always" tough.

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.

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! :(

my teacher says that although im in 8th grade im learning 10th grade schooling.

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

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

Ok is the answer D?

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