Samantha's Chemistry Blog

3 Question Blog #2 1. Tasks I've completed recently are a lab related to the changes in matter, a lab related to the differences in a physical and chemical change and flipped notes 2. Recently I have learned the difference between chemical and physical properties, along with chemical and physical changes. 3.  To improve my understanding I will ask with questions, take time outside of class to go over my flipped notes, and specifically study what different properties are in Chemical and Physical changes.

3 Question Blog #3 I have done extensive practice on isotopes and atoms in PHET simulators to experiment how theyre balanced and changed. I have researched to better understand how electrons change charge. I have learned about the elements found in the periodic table, what is found in an atoms nucleus, how to find the number of neutrons in an isotope, and how to calculate mass. I will watch more videos online on how to find the number of electrons in an isotope and its charge. Then I will attempt to solve these problems on my own to see my improvement.  

Isotopic Abundance Lab The task for this lab was to find the atomic mass of beanium. Each group received 4 different groups of beans. In this case the beans represented the different Atom. We first had to count the number of of each atom in its group and measure its total mass. We then calculated the percent of population by dibided the number of beans by the total. Then we calculated the average mass by dividing the total mass by number of beans. Lastly, to find the Atomic mass we multiplied each isotopes average mass by the percent of population and added the product to the other isotopes. My groups overall atomic mass came out to be .45g.  Evidence  : Limium|Mass: 7.1 g/ Avg= 1.42 g ( 5 beans) 10% Kidneyum|Mass: 8.5 g/ Avg= 0.53 g ( 15 beans) 30% Peagen: Mass: 7.1 g/ Avg= 0.24 g (30 beans) 60%          (1.42g)(10%)+(0.53g)(30%)+(0.24)(60%)/100= 0.4 g 

Exploring Changes of Matter Which examples of matter were chemical and physical ? The task was to carry out and observe 5 scenarios, then determine if a physical or chemical change occurred. The first was to mix 100g of water (H2O) and salt (NaCI) together. The second, we heated up a copper wire in a crucible over fire. The third, was to put 5 drops of sodium hydroxide (NaOH) and 5 drops of copper nitrate (Cu(NO3)2). Fourth, we put 5 drops pf hydrochloric acid (HCI) in 2g of sodium bicarbonate (NaHCO3). Then finally, we subjected paraffin wax to heat in a hot water bath. After conducting each experiment , we then recorded each scenarios reaction beside its procedure to later discuss. -100g of water mixed with 5g of table salt: Turned to salt water and looked foggy -A small wad of copper wire is placed in a crucible and heated: Copper turns to black -5 drops of sodium hydroxide with 5 drops of copper nitrate: Change in state/Composition (jelly) -5 drops of hydrochloric acid ad

3 Question Blog   1. What tasks have you completed recently?        We have completed a total of four tasks the past three weeks in class. The first lab was Exploring        Measurement in the Food Industry, where we determined accuracy and precision after collecting          data for several bags. The second was practicing and learning the importance of significant                  digits. We copied notes and learned what made a measurement more precise or invalid. Third, we        had a Density Lab to find  the density of pennies in water. Then lastly, we worked to solve for the        thickness of aluminum foil by calculating its density, volume and area. 2. What have you learned recently?       I have recently learned how many significant digits are calculated when either adding/subtracting      or multiplying/dividing. I've became familiar with the difference between accuracy and precision        in measurements. Although, its still fresh I have also learned how to fin

        Do You Get What you Pay for?     So the question is if we really get what we pay for when purchasing, in this case a small hot Cheetos bag.  The task was to collect mass information about various bags of chips. Using your data to determine the accuracy and precision of several bags measurements. We first created a table to record the measurements of the product unopened, empty and its difference. In order to avoid any errors and have a dependable experiment, we used more than one bag to compare. We also recorded the net weight written on the bag to compare to our measurements. After weighing the gross and tare weights we could then determine whether or not these measurements were both Precise and Accurate. Accuracy in this case was defined as 28.3 grams +/-. Precision is defined as having a variance less than or equal to .20 grams. In order, bags one through four ranged from 29.2-29.83 grams. So accurately, we're given more than what we paid for since these particular b