Calculate the relative rate of effusion of argon and helium gases at STP?

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

Word equation for k(s) +h2o(l) yield koh (aq) + h2

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these