When a scientist is beginning the process what is the key term she or he must ask in order to begin? A: when or where
B:why or how
C: who or how many?
D: which or what

plz help thank you

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

Express the following number in scientific notation. 0.026890 =

How many molecules are found in 1.32 mol of nacl?