Which two words apply to the substance copper sulphate? Please give 1 answer.
A.
solid, compound
В.
gas, element
C
solid, mixture
D.
gas, compound

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

How are the terms group and period used on the periodic table

Why is any chemical reaction always balanced? give reasons and explain the easiest way to solve the balancing problems in chemical equations with stoichiometric coefficients upto 20 as hit and trial doesn't always work. give full reasoning