True or false a scientists opinion is a valid source of information to use in a scientific investigation?

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

This question is about electrolysis. metal spoons can be coated with silver. this is called electroplating. suggest one reason why spoons are electroplated?

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided