The most abundant gas in the earth’s atmosphere is:
a. hydrogen
b. oxygen
c. nitrogen
d. carbon dioxide

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

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

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?