Look at the four chemical reactions.

reaction 1: 4na + o2 → 2na2o
reaction 2: 2nacl → 2na + cl2
reaction 3: caco3 → cao + co2
reaction 4: 2kclo33 → 2kcl + 3o2

which statement identifies the reaction that is different from the rest and explains correctly why it is different?

reaction 2, because two ions are interchanged
reaction 2, because two products are formed
reaction 1, because a single product is formed
reaction 1, because a single ion is replaced in a compound

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

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

If 22.5 of nitrogen at 748 mm hg are compressed to 725 mm hg at constant temperature. what is the new volume?