Chemicals React!!

Today in chemistry, we basically started where we'd left off yesterday in the Chemical Reactions lab.
First, we combined hydrochloric acid with 6 different substances to observe changes that would take place. The acid by itself was just a clear liquid. When litmus paper was inserted into it, the paper turned pink confirming that it was acidic. The acid was then mixed liquids like sodium hydroxide, which raised the temperature to 24.1°C; sodium bicarbonate, which caused bubbles and lowered the temperature; and silver nitrate, which caused the mixture to turn whiter. It was then mixed with solids like mossy zinc, aluminum and magnesium ribbons. The zinc blackened and fizzed, the aluminum bubbled, and the magnesium fizzed and rose to 37°C.
For the second part of the lab, we mixed cupric chloride with 6 substances. Initially, it was light blue with a temperature of 22.7°C. We mixed it with solids like aluminum shot, aluminum foil and zinc which all blackened and caused fizzing and bubbling. Then the cupric chloride was mixed with liquids. Ammonium hydroxide, sodium carbonate, and silver nitrate all caused different colored precipitates and temperature changes.
Finally, a flask had some cupric chloride put into it. A test tube was then filled with silver nitrate and placed into the flask and the two were mixed. The mixture turned blue and formed small precipitates.
And that's the way the cookie crumbles. The scribe for Friday will be Matt P.

What's Wrong with a Little Change?

To start Chemistry class today, we discussed the Mixtures Lab (due tomorrow), and Mr. Lieberman asked if there were any questions. Question number 6 seemed to be confusing. Mr. Lieberman explained then to ignore it, or write the mass percent of each substance in the mixture.

Next, after turning in the Paper Clip worksheet from last week, we took notes on a powerpoint about chemical and physical propertieds and changes. Remember:
a Physical Propety is one that can be observed without a new substance being formed (ex. boiling point, melting point, texture, etc.).
a Chemical Property is a property that tells us how a substance would react in a given circumstance (ex. at what temperature does cinnabar split into mercury and oxygen?)
a Physical Change is a change that can be observed without the formation of a new substance, including change of phase. (ex. water freezing, boiling, a rock being smashed).
a Chemical Change is a change of a substance into a brand new substance. (ex. a bomb exploding, wood burning, banana ripening).

Finally, went over the prelab for "What Chemical Reactions?", which discusses properties and changes, and also determines that "corrosive," a property of HydroChloric acid, means damaging to skin and clothes, and then started the lab. Most of the groups did not get far because of limited time, but we did get to see some Chemical reactions. We will finish it tomorrow.

Sorry no pictures... I didn't get any good ones. The next scribe will be: Ben T