thermochemistry

this week we worked on thermochemistry.
we learned about how heat transfers from the hot object to the cold.
the energy from the hot objects moves to the cold object.
we also did a lab with the bunsen burner again.
we had to weigh the cups and every little detail.
i think i did it wrong though.
we got a new packet that was just due this friday.
it was about the flow of energy.
the picture is of a beaker that stuck to the piece of wood because of the transfer of energy.

stoichiometry lab: Na2Co3 plus HCl

this week, we did a lab involving fire again.
we boiled hydrochloric acid with sodium carbonate.
when, we burned it for about 5 minutes, the contents boiled away.
we had to weigh the beaker, beaker + HCl, beaker + NaCl (aq), and beaker + NaCl (s).
click here to find the results of the lab( not our results though, the general result)
the picture is of bubbling hydrochloric acid!
tomorrow, we are going to take the stoichiometry test.
i do not think i'm ready, so i got to go study.
the yellow stoichiometry packet is also due tomorrow.
that's a lot of work!

stoichiometry

stoichiometry can be simplified as grams to moles to moles to moles to grams.
we worked on that this week.
we also did a lab called oxidation of magnesium.
in that lab, we burned magnesium ribbon.
before, we weighed the cruicible.
after, we weighed the magnesium oxide with the cruicible.
we had 31.67% error on ours, because we didn't scrape out the scraps from the previous period.
now, i am going to get my blog posts checked.

reactions 2 packet

we worked on the reactions 2 packet this week.
we had to balance synthesis reactions, decomposition reactions, and double-replacement reactions.
it was homework this week to finish up the packet.
we also saw fire in class.
i forgot what it was, but bubbles added to a lighter made a bright and pretty flame!
this week was also the cahsee testing.
i don't have a first period, so i was not use to going to school so early.
it was pretty easy though.
this whole week was easy!