Solve the following and show your working. If helium's average speed is 1400 m/s, what is the average speed of HCl ?

Why is carbon ideal for making different compounds?

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 compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-