Chemistry 20 points
answer all the questions

Explanation:

Remark

First of all you have to identify what is happening. You make the following observations.

The solution in the test tube in a cold water bath is colorless.

As you add heat, the color changes from colorless to brown.

What you are told

N2O4 is colorless

NO2 is brownish red.

What you conclude

The reaction is endothermic. That means it requires heat to happen. An endothermic reaction is

A + Heat ===> B

So you have three possible correct answers

N2O4 + 14 kCal ===> 2NO2

N2O4 > 2NO2                    dH = 14 kCal

N2O4 > 2NO2 - 14  kCal

I can't read the last 4 equations.

Other answers

As the temperature increased, the N2O4 became less.

As the temperature increased, the products were favored. (color change)

The reaction is exothermic (gives off heat) when the reaction goes from

NO2 - Heat ===> N2O2

put the answers   and i could answer.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).