learning log
lab saftey and chapter 1
The focas of this week was chapter one and lab saftey. Goggles must be worn at all times durring lab and until all materials are put away. You also must wear an apron and keep your table clean. To test ones ability in the lab, a practice lab was done this week. The objective was to see how glycerin and soap effect bubbles. The largest bubble made was some 40 centimeters in diameter using just soap. Many groups saw improvment as the amount of glycerin was increased. The test involoved goggles and pipets to not contaminate your eyes or other samples. Other such rules placed in case of an emergency include calling the teacher imeadetly if an accedent did occur and if the samples had gotten in the eyes you would have needed to wash them constantly for fifteen minutes. Also, this week the stuctures of molecules was metioned. It is known that matter is what makes up all objects and that matter has mass. Regular substances are are made of molecules which are made of atoms. There are many elements that can make up an atom. One of whitch is gold or carbon. The elements are catorized into three different groups: metals, nonmetals, and semimetals. The characteristics of metals include how shiny it is, malability, ductility, and electrical and thermal conductivity. Nonmetals are basicly opposite. They are dull, brittle, and are poor conductors. Semi metals are a mixture of both and characteristics may varry. The elements were amazingly oranized into the periodic table. There is a noticable staircase on which are the semimetals. To the left of the staircase are the metals and to the right are the nonmetals. The periodic table is also organised in colems called families and rows called groups. The families all have similarities like reactivity and the number of their electrons. On the other hand the groups get incressingly different as you move from side to side. Also metioned about matter, were homogenious and heterogenious mixtures along with compounds physical and chemical changes.