Which of the following defines sublimation?

solid ➡ gas

solid ➡ liquid

liquid ➡ solid

gas ➡ solid

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !