WhAt is an example of a chemical change is: Boiling water, Melting butter, Spreading cream cheese, Toasting bread?

What is the percentage composition of carbon in the compound ch4

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?