Class of: 03-Feb-2016.
Today we started Chapter 6: Elements, Compounds, and the Atomic Theory.
We began with Section 6.1: Properties Are Used to Identify Matter (p. 149).
Learning Objectives:
- Students will be able to classify substances as mixtures or pure substances using their physical and chemical properties.
- Students will be able to classify pure substances as elements or compounds again based on their properties.
- Students will be able to write the chemical symbol and chemical formula for any element on the periodic table.
As an interesting fact about physical properties, osmium (atomic number 76, chemical symbol Os) is the densest substance on the planet. It is also, therefore, the densest metal (including any alloys). Unfortunately it forms an extremely toxic compound with oxygen when exposed to the air, and it is also a pyrophoric substance, meaning that is bursts into flames spontaneously at room temperature. So, you probably won’t find it being used as cutlery any time soon!
Also, in case you were wondering, when you want to give an example you use “e.g.” because it stands for “exempli gratia” in Latin, which translates to “for the sake of the example.” This is different than when you use “i.e.” to indicate only one specific thing, which stands for “id est,” meaning “that is”
Please work through the following review problems:
#1-11 on p. 152.