My chemistry blog

Recently we have completed a " Chemical vs. Physical properties and changes lab". This lab consisted of 10 different experiments. The first experiment consisted of a bunsuen burner and matches, each person in the group took a turn lighting the Bunsen burner. The second experiment consisted of Alka seltzer tablets, a graduated cylinder, a stopwatch and water. At this station we put the tablets in the water and observed what happened as well as answered questions. The third experiment consisted of cobalt II chloride, sodium phosphate, a small test tube, and empty beaker and a waste beaker. With these materials we first placed the test tube in the small empty beaker, then we transferred five drops of cobalt II chloride solution into the test tube. Then we answered a few observational questions and following those questions we added 5 drops of sodium phosphate in the test tube. We then answered more questions and cleaned up our station. Next was experiment four, at this station w...

In this lab we conducted an experiment about exploring changes in matter. The question in which we were trying to answer was "Which changes were examples of a chemical change and which were examples of a physical change."  A physical change is when nothing new is made, things stay the same. In a chemical change, you get something new and different that wasn't there before. During this lab we had five tasks to complete. Each task consisted of adding ingredients together and observing the data to determine if  a chemical or physical change has occurred. The first task we completed was 100g of water mixed with 5g of table salt. The second task was a small wad of copper wire is placed in a crucible and heated. The third task was five drops of sodium hydroxide and five drops of copper(II) nitrate mixed together. The fourth task was adding five drops of hydrochloric acid to 2g of sodium bicarbonate. Then fifth and final task was paraffin wax subjected to heat in ...

Recently I completed a lab based on the density of pennies. During this assignment we had to complete a list of eight procedures. Each procedure had specific steps on how to conduct each part of the lab.  I first started off by recording the dates of the pennies, then I Put the pennies in chronological order oldest on top to newest on the bottom.  In groups of two's I weighed each set of pennies on the  balance pan to find their mass.  I recorded my data on the chart in my packet. After I waited all 14 pennies on the balance I filled a graduated cylinder (with water)  to the 30 ML mark. I then flip the pennies over and placed  them oldest to newest.  I then placed the oldest two pennies in the graduated cylinder and recorded the volume of the graduated cylinder. I repeated these steps until all 14 pennies were in the graduated cylinder. I recorded all of my results onto the data table.  With my data table completely filled out I went on to data an...

During this lab exercise we were trying to discover whether each bag of Cheetos had the same mass, and if the buyers (us) were  getting what they payed for. We first began the lab by gathering four bags of cheetos and labeling them one through four. We then weighed each bag of cheetos with the content inside (one bag at a time) on a scale. Each weight was recorded onto a table, this first weight was called the "Gross weight" meaning that this was the initial weight of the unopened bags with the amount of cheetos it came with. We then emptied the content of each bag onto a paper towel, followed by taking the Empty bags back with us back to the scale. Once again we weighed each back individually and recorded the weight onto the table. This time there was nothing in the bags and this weight was called the "Tare weight" meaning the weight of the bag with out the cheetos. The next step we took was to accumulate our "Net Weight" which was the amount of "Ta...