If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11 which of the following is true.
- [HCHO2] < [NaCHO2]
- [HCHO2] = [NaCHO2]
- [HCHO2] << [NaCHO2]
- [HCHO2] > [NaCHO2]
-it is not possible to make a buffer of this pH from HCHO2 and NaCHO2

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

The law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.