Johannes kepler analyzed a large collection of data about the motion of objects in the solar system. he discovered that objects orbiting the sun follow a number of laws. one of these laws is that the size of an object's orbit times the square of its velocity is equal to a constant. if r is the size of the orbit (how far the object is from the sun) and v is the velocity, then

earth's average orbital velocity is about 6.7 times faster than that of the planetoid makemake. rounded to the nearest whole number, makemake's orbit is about times larger than earth's orbit.

Noble gases are the most reactive elements on the periodic table. a. true b. false

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction