Article: Make up three to four concentrations of one solution. Using a spectrophotometer, measure the absorbance of one concentration of solution at a given wavelength. Start with the lowest concentration of solution and move to the highest. The order isn't important, but keep track of which absorbance goes with which calculation. Using the values obtained from the spectrophotometer, plot each point on a line graph. For each individual value, plot the concentration on the X-axis and absorbance on the Y-axis. Draw a line between each of the points. If the measurements are correct, the points should form a straight line indicating absorbance and concentration are proportional to Beer's Law. To calculate the slope of the line you take rise divided by run. Using two of your data points, subtract the X- and Y-values from each other, then divide Y/X. The equation for the slope of a line is (Y2 - Y1)/(X2 - X1). The point higher on the line is given the subscript 2, while the lower point is given the subscript 1. For example: The absorbance at a .2 molar concentration is 0.27 and at 0.3 molar is 0.41. The absorbance values are Y-values, while concentrations are X-values. Using the equation for a line (Y2 - Y1)/(X2 - X1) = (0.41-0.27)/(0.3-0.2) = 0.14/0.1 = 1.4 is the slope of the line. The final step to calculating molar absorptivity with data points is to divide by the path length. The path length is the depth of the cuvette used in the spectrophotometer. Continuing our example: If 1.4 is the slope of the line and the path length is 0.5 cm, then the molar absorptivity is 1.4/0.5 = 2.8 L mol-1 cm-1.
Question: What is a summary of what this article is about?
Measure the intensity of transmitted light through varying concentrations of solution. Plot the concentration versus absorbance on a graph. Determine the slope of the line-of-best-fit through the data points. Divide the slope of the line by the path length (depth of the cuvette) to calculate molar absorptivity.
Article: Contract phones need to be locked to the mobile network carrier for a specific span of time, as stated in the contract or agreement. However, some carriers lets you unlock your phone even while under contract, as long as you meet the following criteria: You are the owner of the Optimus G and can provide the account details related to the phone's contract. Your phone has already been paid in full price, regardless of the remaining time you need to stay on the service as stated in the contract. In example, you've already paid the full price of the Optimus G even if you're only on the first year of your contract. Your phone was not reported as stolen or lost. If you meet these basic criteria, then you may call your carrier's customer service hotline and ask if your Optimus G is eligible for unlocking. If it is, they will assist you with the process of unlocking your phone. You may call these numbers if your Optimus G is from one of these carriers:AT&T (U.S. Clients): (800) 331-0500Verizon (U.S. Clients): (800) 922-0204 or dial *611 from your Verizon phoneSprint (U.S. Clients): (844) 665-6327 or dial *2 from your Sprint phone Once your phone has been unlocked, you can now use any SIM from other mobile network carriers, both local and international.
Question: What is a summary of what this article is about?
Meet the carrier's criteria to unlock your phone. Contact your carrier.
Article: Regular exercise helps boost energy levels and metabolism, and even helps the brain. You should incorporate 4-5 days of exercise into your regular routine to help keep you energized and strong. Make sure to exercise a few hours before bed so it doesn't interfere with your sleeping patterns. A study at the University of Georgia found that exercise was more effective than some medication to help boost energy and keep you awake. Regular exercise also helps improve the quality of your sleep. Try walking, cycling, swimming, or hiking. Do something each day for 30 minutes that gets your heart rate up. If you are sitting at your desk and feel like nodding off, try getting out of your chair and moving around. Take a walk around the office, do a few jumping jacks, run in place, or even do some squats and crunches. This helps get your blood pumping and wakes you up. A study at California State University found that a 10 minute walk kept you alert for 2 hours afterwards, while a candy bar only kept you alert for 1 hour and led to a crash afterwards. Stretch. Get out of your chair and touch your toes, stretch your back, and stretch your arms overhead.Stretching gets your blood flowing. When sleepiness hits, try doing some simple yoga poses. Yoga can help warm up the body and work as a natural stimulant. Start with cat-cow pose. Get on your hands and knees with your shoulders and hips over wrists and knees. Move your spine rhythmically. With every inhale, arch the back and lift the sitting bones and chest. When you exhale, round the back and tuck your chin and pelvis. Start in downward facing dog. Lift your right leg up behind you. Round your spine while drawing the knee to your chest. Round your upper spine upwards as you keep the pelvis low. The right thigh should be against your chest and your knee should be against your nose. Return to downward facing dog. Repeat with the left leg. This raises oxygen levels in the blood and helps improve circulation. Breathe through your abdomen for the most effective deep breathing. Sit up straight. Place a hand on your belly. Inhale through your nose. Make sure your belly pushes your hand out while your chest doesn't move. Push the air out through your lips. Complete this exercise 10 times. Inhale and exhale quickly through your nose. Keep your mouth closed and relaxed. The breaths should be short. Then breathe normally. Try for 15 seconds, adding 5 seconds until you can do this for a minute. A study presented at the SLEEP 2012 conference found that obesity and excess weight gain caused daytime sleepiness. Diet and exercise can help lose weight, in addition to helping improve your energy levels.
Question: What is a summary of what this article is about?
Exercise. Move around. Do yoga. Breathe deeply. Lose weight.