Blog Week 17

I wasn't sure if we were suppose to blog for week 17, so I'm doing one just in case. On Monday, I was absent. On Tuesday, we talked about the lab that was done on Monday. We then worked on the problem: 49 grams of salt dissolved in 121 grams of H2O. So. decided that salt/ over the whole solution would give us the percent composition by mass. So we set up the problem 49/121+49. which would equal 49/170= 28.8%. After we discussed that we went on to compare mixtures and compounds. Mixtures are two or more elements/pure substances mixed together without being joined. Compounds are two or more elements/atoms bound together. Compounds are a fixed ratio. So,we then planned how many game. We had two elements, which can make one mixture and eleven compounds. On Wednesday, we learned properties of metals and non metals. The properties of metal are: solid at room temperature, higher density, hardness, luster-bling-shiny, conductive-heat-energy-electricity; malleable-ability to bend, shape, play like play dough and higher melting point and boiling point. The properties of nonmetals are: liquids or gases at room temperature, poor conductors.  no luster, brittle-in solid state-breaks easily, lower density, and lower melting point and boiling point. Then we found that Ca3P2 means that it has 3 Ca and 2 P. We then learned that (NH4)2O equals 2 N, 8 H and 1 O. We learned that H2 is called dihydrogen and O is called monoxide. CO is carbon monoxide. We learned three rules and they are: Rule #1: subscripts in compound formulas, tells the number of atoms in a compound. Rule #2: Subscript matches up with prefix *Exception: if first element is only one atom then leave out the "mon". Rule #3: Last name gets changed to "-ide" Ex- Oxygen--> Oxide. On Thursday we learned that H2O is a 2:1 ratio. If we had 50ML of H2O then the volume of each molecule 25 ML. Here's a picture of molecule diagrams.

On Friday, we reviewed for the midterm it really helped going through the review sheet.