Which statement describes what it means for energy to be conserved? Energy released by a reaction disappears.

Energy gained by a reaction is new energy.

Energy gained by a reaction must be taken from another reaction.

Energy released by a reaction is gained by the surroundings.

energy released by a reaction is gained by the surroundings.

Explanation:

umm... I'm not 100% sure about this

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.