Classify the following substances as element, mixture or compound a. limestone b. diamond c. soil d. urine e. bronze f. sugar g. gold h. soap i. milk j. air k. neon

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li