Unit 1: Precision and Accuracy of Measurements

Today we:

• Talked about the differences between Precision and Accuracy
• Handed back Quiz #1
• Received homework sheet on the Metric System
• Took notes on Precision, Accuracy, Measurements, and the Metric system.

To demonstrate how Precision and Accuracy contrast, we held an in-class competition based on the aim of the competitors. The more precise and accurate you were, the better you would perform.

Precision- how reproducible your value is

Accuracy- how close the measurement is to what it actually should be

Measurements- Use the metric system (Mass in grams, Length in meters, Volume in liters)

The Metric System- The following prefixes are used. Focus on 10^6 - 10^-12, specifically 10^3, 10^-2, and 10^-3.

HW: Metrics Sheet

Tomorrow's Scribe is Cody D

Day 6: Atoms and Paperclips

                  In class today we learned about pure substances and mixtures. We made a graph in class and i think it helped me understand this kind of stuff so im going to recreate it down below.

                                                                              Matter

                                                  _________________|__________________             

                                                  |                                                                       |

                                 Pure Substances:                                                        Mixture:

                    A substance that's smallest pieces                             Different types of atoms or 

                           are the same. Can be:                                        molecules that are physically 

                        Monatomic- single atoms                                         mixed together, but are not 

                Diatomic- atoms boned in groups of 2                                 chemically bonded.

             Polyatomic- atoms bonded in groups of 3+                            ________| _________

                        ____________| ____________                                  |                                   | 

                        |                                                |                        Homogeneous:           Heterogeneous:                         

                Elements:                               Compounds:             A mixture that has      A mixture that has 

          A substance that                    two different types           the same makeup.    the same makeup, but

         contains only one                   of atoms present in                                               can have different

             type of atoms.                     the same molecule.                                                     amounts.           

             ______|______                                     |                                                                                                   

             |                        |                             molecules:          

       Atoms:            Molecules:             Two or more atoms that

   the smallest        two or more             are chemically joined  

  basic unit of       atoms that are           together. Can be more 

   a chemical       chemically joined       than one kind of atom.

     element.       together. Can be only         (H2O, CO2)

        (Cu)            one kind of atoms.

                                 (H2, O2) 

               We also did a paper clip lab. In the lab we basically attached different paperclips together to make molecules. This is a picture of my groups molecules.

 the next scribe is Nazia L.