A substance, X, has a melting point of 649 °C, a boiling point of 1107 °C and is insoluble in water. State an additional test that could be done to find out whether substance X is an ionic compound

Different isotopes indicate that an element will have different numbers of

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Find the number of moles of argon in 364g of argon.