Julian's chemistry blog

Is it Physical or Chemical Change? The question we tried to answer was is a physical or a chemical change occurring. We did this because we wanted to know the difference between a chemical and physical change and how to know if it is either chemical or physical. How we did this was that we did an experiment in the experiment we did 5 example between physical and chemical examples.   The five examples were: Water with Salt Copper and Heat Sodium hydroxide and Copper nitrate Hydrochloric acid and Sodium bicarbonate Paraffin wax heated by water Our claim was that the physical change is physical because it is the same thing before and after therefore nothing new. a chemical change is a chemical because its new and different. Our evidence was that the physical changes were water and salt and paraffin wax.  Because in the end it was still water,salt, and paraffin wax. The chemical changes were copper and heat, sodium hydroxide and copper nitrate, hydrochlori...

The task that I have completed recently in my class of chemistry have been 2 labs, and a pogil, regarding significant digits and significant digits calculations. The pogil we did was significant digits and measurements this was the first thing we did to learn the basics of significant digits and how there manipulated like if you have only centimeters and no millimeters you estimate to the tenths place like if it 5 centimeters you have to add a 5.0 centimeters but if it has a millimeters then its 5.12 the 2 is estimated. Then the lab we did was density of pennies where we calculated the volume of the pennies in a 100mL graduated cylinder by using significant digits. then we had a lab about figuring the thickness of aluminum and to do that we had to convert units. So the things i have learned recently is about significant digits, how to round them, how to calculate them, and how to convert units well that I still haven't got it completely. Finally,   to improve my understanding I...