For a substance to reach its boiling point, a substantial amount of energy must be added. The boiling point occurs when the .
A temperature increases
B vapor pressure equals atmospheric pressure
C particle velocity equals the boiling point
D vapor pressure reaches the critical point

What semimetal can form four single covalent bonds.

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

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)