Classify the reactions as endothermic or exothermic.
the reaction between
ammonium nitrate and
water absorbs heat
from the surrounding
environment.
three drops of concentrated
sulfuric acid added to 100
milliliters of water in a beaker
makes the beaker hot.
ammonium chloride dissolved
in a beaker of water makes the
beaker cold.
uranium atoms are split to
produce nuclear energy.
water separates into
hydrogen and oxygen
when an electric current
is run through it.
methane and oxygen are
combined to produce
methanol and heat.
endothermic reaction
exothermic reaction

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