Write a net ionic equation for the reaction that occurs when nickel(ii) sulfide and excess hydrochloric acid (aq) are combined.

What layer of the atmosphere is directly above the troposphere?

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.