How does increasing the temperature affect collisions?
O A. It makes the molecules stick together when they hit.
B. It increases the number of high-energy collisions.
O C. It lowers the amount of energy the collisions must have.
D. It reduces how hard the molecules hit each other.

Enough of a monoprotic weak acid is dissolved in water to produce a 0.0172 m solution. if the ph of the resulting solution is 2.39 at 20 °c, determine the pka for the acid.

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

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