Anthony's Chem blog

Recently I have done extensive practice and research on atoms and isotopes in PHET simulators to better my understanding of what we are doing in class . I have learned about the periodic table, what determines if an atom is negatively charged or positively charged, we’ve learned about ions , how to calculate mass I will crest flash card to help me understand what element is what, & I will solve problems relating to finding the mass

Which changes are examples of a chemical change and which ones are an example of a physical change? Claim- chemical changes occur when something that wasn’t there before a change in composition  is created and a physical change is just a change in appearance nothing new is created or found.  Evidence- 1) 100g of water mixed with 5g of table salt - change in color  2) a small wad copper wire is heated - change in color  3) 5 drops of sodium hydroxide & 5 drops of copper nitrate mixed- liquid to a solid  4) 5 drops of hydrochloride added to 2 g of sodium bicarbonate- bubbles , acid  5) paraffin wax subjected to heat in a hot water bath- solid to liquid then back to a solid after cooled Reasoning- chemical changes occur when there’s a change in composition such as change in color, bubbling, heating, etc. physical changes occur when there just a change in for such as liquid to a solid , freezing, heating etc. 

How much does beanium weigh? Claim-  beanium weighs about 0.45 g per bean Reasoning -   we   began by separating all the different kind of beans and setting them aside and then we began to weigh them all in their groups as a whole. Then we got the weight and divided it by however many beans there were.  once we got the mass and average mass we figured out the percentages. After that we were able to multiply the averages mass by the percentages and then add them together and divide them by 100 to get a relative mass of a bean.  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= 0.45 g Answer is 0.45 g

1)  Recently we have been working a lot with density and completing multiple labs up to this point in the class. 2)   We have learned basic measurements and the equations on how to find these measurements and how to convert them as well as how to do lab write ups, blogs 3) I plan on taking more time to study throughout the week as well as have a family member quiz me on notes and equations we have learned so far to better my understanding and knowledge of how to use them in the class.

Do you get what you paid for? Claim- yes, you do get what you paid for you actually end up getting more than what you paid for. Evidence- Full- 30.40 grams                          30.62 grams 30.50 grams 30.09 grams Empty- 1.54 grams 1.52 grams 1.51 grams 1.53 grams Difference- 28.86 grams 29.1 grams 28.99 grams 28.56 grams Our precision was 0.54 which was more than .20 Reasoning- Accuracy- related to the actual value of the object measured. Precision relates to how small a value can be distinguished by the instrument. We were trying to see if you actually get what you pay for & see how precise and accurate advertising is. first we weighed the bag of chips to see how accurate the weight on the bag was, then we weighed the same bags but empty, after that we calculated how precise the weight was to see if you really ...