Check all statements below that are true.
heating air under the balloon will cause the
air inside to expand.
the air inside will have the same mass but
more volume.
heating the air under the balloon will cause
the entire balloon to rise.
the outside temperature will have no affect
on the height of the balloon.
the only way to make the balloon sink is to
let out the air

Idon’t understand this page, can someone ?

When balancing a chemical equation:

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