Changes of state occur when there is change in a. thermal energy b. electromagnetic energy c. chemichal energy d. eletrical energy

Which of these best describes an ionic bond?

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

What is the percentage of hydrogen in nitrogen trihydride