Conversions! Aug 29th

Today in class we went over conversions! We learned that there is a certain way to set up and solve the conversions. It is easier to do it this way so all of our work stays organized! This is very important for Chemistry, it will make the math easier to figure out! Some examples of conversion factors: 1 liter to 100 cL= a conversion factor 24 hours to 1 day= a conversion factor One example of an easy conversion is: 1daL=______ cL It is difficult to set it up correctly on the iPad. However, you would make a chart and solve it that way. The answer you should get is 1000cL Then we learned a bit harder conversions such as: 3.2*10^7pm= ________ mm You would again use the chart, and get the answer 3.2*10^-2mm Homework: 20.) 882*10^-6g 21.) 0.0603*10^-3mL 23.) a.) 92.25*10^3k B.) 92.25*10^-2c 38.) a.) 4 B.) 1 C.) 6 D.) 3 None of these answers match the answers on the sheet, but I did them like we did in class!

Significant Figures- Aug 28th

Today we learned a little bit about significant figures! We learned how to identify what sig figs are, and the rules needed for when it becomes more difficult to figure out what the sig figs are! For Example: 0.00700 there would be 3 significant figures. Then we learned multiplying and dividing with sig figs. For Example: 1.69m times 2.09m= 3.5321m squared. However, for multiplying and dividing you change it to 3.53m squared. Then we learned add/sub. It is similar to mul/div however you change the answer in a different way. For Example: 1.26+2.3=3.56 due to 2.3, you would change the answer to 3.6. Thanks to the stuttering talking man we learned sig figs today! :) Homework: 2.) A. 4 sig figs B. 2 sig figs C. 6 sig figs 3.)2.7 4.) A. 53.88g B. 77m C. 3.159 (I am unclear on what the units would be!)