The purpose of washing the test tubes thoroughly is so the chemicals don’t cross contaminate and affect the outcome of another section of the lab. Hypothesis: 1. If a substance contains lipids then when rubbed onto a paper bag a transparent or opaque spot will appear. 2. Is a substance contains starches then when iodine solution is added to the substance it will change from yellow-brown to blue-black.
This colligative property is important in many industries, but is clear to see when using ordinary salt to remove ice from steps or a driveway. The water takes salt into solution, which in turn lowers the freezing point of the water, ensuring that even sub-freezing ambient temperatures do not lead to ice buildup anywhere the salt or ice melt was applied. Experimental Procedure: Before any measurements were taken, equipment was set up and calibrated. Using Microlab’s integrated calibration file the thermistor was calibrated in order to obtain accurate temperature measurements. A graph for the data was also set up with time on the x axis in .5 second intervals and temperature on the y axis.
____blows out hot air_________ 2. What does a thermostat do if it gets too hot? _______stops blowing hot air_____________ 3. How do our bodies sometimes act like a thermostat? _______in homeostasis, negative feedback is used in the same way, by increasing the stimulus until it is excessive and then decreasing or stopping___________________________________________________ _______________________________________________ Gizmo Warm-up To survive, an organism must be able to maintain stable internal conditions in a changing environment.
UNIT 4222-233 MEET FOOD SAFETY REQUIREMENTS WHEN PROVIDING FOOD AND DRINK FOR INDIVIDUALS. 1.1 Workers should be aware of and practice personal Hygiene - eg, hand washing, hair up and nails short and clean. Food stored at correct temperature, chilled or frozen. Food stored in correct conditions - eg raw meat not contaminating cooked meat & veg not using same utensils for raw meat and other foods using correct chopping boards. Food should be served at the correct temperature; temperature should be monitored if food is kept in warming trays.
Why is it important to determine these physical properties of a substance? The melting point of a solid is the point at which a solid becomes a liquid with standard atmospheric pressure. The boiling point of a liquid equals the external pressure. It is important to know these characteristics of a substance so that you can handle them in the correct manner. The boiling point and melting point can also be used to identify an unknown substance.
Osmotic pressure, one of the colligative properties previously discussed, is defined as the pressure used by the water flow through a membrane separating two solutions with different concentrations of various solutes. The purpose of this lab was to assist in the educating one upon the freezing points of a pure solvent compared to that of a solvent found within a nonvolatile solute, while at the same time understanding and gaining a greater depth of osmosis. I greatly enjoyed this lab, although I wish it could have been conducted in less time. Observations: I took note of several components of the lab conducted. The dialysis tubing was one I especially monitored, checking every hour with recordings.
To note the endpoint of the reaction, a pH electrode probe is placed in the reactant. In understanding and finding out the results of the laboratory, it is important to know its components, find the percent composition to see how much acetic acid is in vinegar, and to find the pH solution of vinegar. Experimental Investigation One: First, be sure that the temperature and the pH electrode are set up and are connected to LoggerPro software. Rinse the probe with distilled water after you unscrew the top cap and then dry afterwards. To calibrate the
Make sure the rubber stopper is securely in place since gas can easily leak out. Collecting the gaseous product: Prepare the gas collection bottle by positioning the bottle so that its mouth is. directly over the hole at the bottom of the trough; this is where the gas will enter the bottle. After the reaction, slide a square of glass over the mouth of the bottle while the bottle is still under water. Keeping the glass fixed to the mouth, raise the collection bottle and invert.
SEC failed at this due to the fact that their product will not operate above 130 degrees F, and that the requirements would not be able to be met without different materials (The Orion Shield Project, 2003). Due to this issue alone, it caused problems with the project, delaying the timeline for completion, increased the amount of resources used and not committing to the stakeholders. Not only did they fail to meet the temperature standard, they also failed to meet the life span expectation. Mr. Allison is responsible for overcoming these technical objectives as project manager of The Orion Shield Project. Ethical Issue: Before even beginning the project, Mr. Allison couldn’t keep his commitment in regards to meeting the temperature requirement.
It shows that the oil and gas industry has had several breakthroughs with technology, including hydraulic fracturing. These breakthroughs have found ways to make hydro fracking more environmentally friendly and cost efficient. With any technological developments, there are consequences. For example, there is the possibility of polluting the water supply with chemicals. There is the possible pollution of air as well.