In an isotope, what does the 'u' stand for? For example: Lithium isotope: Li-6 6u
The u after 6

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line