2/14/11
We went over the homework. It was to work on sections of the Lab and to balance a few equations. The Lab is going to be due friday it should be typed, you would only get about half a point off if you don't.
Each table went over the balancing equations with each other. One of the equations... # 3
__Na2CO3+__HCl -->__NaCl+__H2O+ __CO2 each side has to be equal, just like an equation. the answers in red are the answers. our test will be on thursday!!!!
What can we do with our starting measurments and ending?
compare them H2O left the test tube...if you start with 57 g and end up with 23 g...34 g left the test tube. this can be good data and observations for your lab.
How does this apply to the conservation of mass?- the particles still weigh the same but are not in the same spot and the mass of the atoms went away from the test tube but if we colected them it would still be the same.
conservation of mass- mass cant just disapear what ever we start with we have to end with.
What happened to the arrangement of atoms?- everything was separate in the beginnning, all one big group the molicules were no longer together in the end, we changed the organizaton of the particles.
wich of these involved rearrangment of particles?
crumpled paper
burning magnesium ribbon
lighting a match
melting ice
soaking water up with a paper towel
nail getting rusty
the red ones were rearranged because theybecame two separate things.
in each of the RED ones the particles leave the source. unlike the Non Red ones.
GP
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