If 8.00 g ammonium nitrate is dissolved in 1.0 l water, the water decreases in temperature from 21.0 °c to 20.39 °c. determine the molar heat of solution (in kj/mol) of the ammonium nitrate. the density of water is 1.0 g/ml and assume that the resulting solution has the same specific heat as water (4.184 j/goc).

Describe the forces both attractive and repulsive that occur as two atoms move closer together.

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet

Why is the bottom layer of a trophic pyrimid the