In witch of these examples does chemical energy change to electrical energy

examples
a)digesting food
b)photosynthesis
c)respiration
d)using a battery

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

What is the percent by mass of magnesium sulfate in mgso4.7h2o