In this experiment we took an original mixture and split into three components. By decanting and dissolving materials we were able to find the percentages of each material in the original mixture. From the results we found Sand and NaCl to be the majority of the mixture, however in reference to the Law of Conservation of Mass, we found a slight discrepancy in the final results.
I had gotten a call on Monday at around 4:00 in the morning to come in at the large firm as a dead body had been found in the building. I reached at the large firm at 5:00 AM and found police cars, ambulances, and fire trucks at the scene. A few of my colleagues had come up to me to give me the information from the cleaning crew who had found the dead body. I asked the coroner to measure the body’s temperature and he told me it was currently 88.2oF. I decided to wait an hour to see the decrease in the body’s temperature. Until then I decided to search for more evidence. One of the cleaners told me the building stays at a constant temperature of 67oF. At 6:00 AM, the coroner measured the body’s temperature and it had decreased 1.5 degrees. The body’s temperature was
In Section A, the average mass of the 50 ml beaker was weighed 3 times using 2 different electronic balances. The final average mass recorded was 33.73g. The volume of distilled water needed was calculated from the mass of water using the density= 0.9971g/mL in Section B. The volume of water needed was transferred using pipette, graduated cylinder and Erlenmeyer flask respectively. In Section C, a pipette was calibrated by measuring the water temperature and the density was determined. The average mass of water was calculated and the reading was 20.68g. The value for the relative average deviation was 5.33%. In Section D, the crucible, crucible lid and anhydrous magnesium sulphate were weighed and the % water in magnesium sulphate hydrate was recorded calculated which is 41.56%.
Physical Means was the first method we used to separate parts of Sludge. Physical Means means that you are taking something out (most likely a insoluble solid which is what we did) either with a tool or with your hands. We had four insoluble solids in our mixture and we used our fingers to remove each of them
Experience 1: For children to experience the solid form of water, and to understand freezing and melting process. This experience helps children to see the relationship between ice and water. It support children to understand temperature can make water change its form, and for children to recognize the term solid, freezing and melting.
People drink sodas and iced teas in their everyday lives and I wanted to investigate which of the two is less harmful in terms of sugar content. We wanted to examine and precisely measure the amount of sugar in four different sodas and two different iced teas to see if the amount of sugar indicated on the soda and iced tea bottle labels per 250ml is accurate.
Chemical reactions which cause a change in temperature can be categorized as endothermic or exothermic reactions. In an endothermic reaction, energy will be absorbed by the chemical mixture; in an exothermic reaction, energy will be released. If a beaker is submerged in a mixture with a cooler temperature than the water inside the beaker, heat will be transferred from the water in the beaker to the chemical mixture, making the chemical mixture undergo an endothermic reaction. When the chemical mixture is warmer than the water inside the beaker, heat will be released from the water inside the beaker to the chemical mixture, making the chemical mixture undergo an exothermic reaction. The goal of this lab was to learn about endothermic reactions, exothermic reactions and
In Part A of the experiment which is sterilisation technique, three types of technique is used. The first technique is dry-heat sterilisation. Dry heat sterilisation takes a long time and is done at a high temperature of about 160°C for 60 minutes. In dry-heat sterilisation, there is two parts which are heating and flaming. Heating is when the inoculating loop and the needle are burned in the direct flame until it turns red in colour while flaming is just passing the forceps and mouth of the culture tubes through the flame to prevent bacteria from entering. The second technique is moist heat sterilisation whereby an autoclave is used. Autoclave is operated at a temperature of 121°C and a pressure of 15 psi for about 15-20 minutes. In this experiment,