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