Experiment Two: Laboratory Techniques And Measurements

Procedure: Measure the volume, mass, length and temperature of a variety of items. Create dilution of sugar water.

The dependent variable in the experiment was the temperature and energy absorbed by the water.

Procedure: Using distilled water, premeasured containers and objects determine displacement of fluids and density of objects. Use ice and heat measure temperatures in Celsius, Fahrenheit and Kelvin.

Procedure: I used a ruler, thermometer, and scale to take measurements. I used a graduated cylinder, short step pipet, scale, and ruler to determine volume and density. I used a volumetric flask, graduated pipet, pipet bulb, scale, and glass beaker to determine concentrations and densities of various dilutions.

An error that could have occurred during this experiment would be the failure to heat all of the water particles in the air off the

Students will carefully observe acts of aggression and prosocial behavior on television, report their observations, and analyze their data to draw conclusions.

The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.

Lab 1 also teaches us the importance of molecular weight of a substance and how to use that to find the amount of moles of that substance in a solution. For example; in exercise 3 we were asked to weigh 8 grams of sugar and then calculate how many moles of sugar it really was. Using the molecular weight of sugar (C = 12.01 grams/mol, H = 1.008 grams/mole, O = 15.00 grams/mole). We were then able to use this molecular mass of the sugar that we then had to use to calculate and determine the molarity of the sugar

3. The volume of a fixed mass of a liquid sample increases as the temperature rises from 20 to

13. The temperature of the water was measured prior to the tube being placed in it and the temperature of the Hydrochloric Acid was measured after it 's temperature had adjusted.

During this lab the temperature and Oxygen levels were measured at a multitude of depths. The temperature at 0 meters was 27.26 °C. The temperature reading was then done at 1 meter below was 27.2 °C. The Temperature than began to drop constantly until about 10 meters down where the temperature was at 10.09°C. From this point the temperature dropped less dramatically until settling on 7 degree range. The lowest Temperature was at the bottom of the lake being 22 meters deep with a temperature at 7.35°C (figure 1).

The purpose of this lab is to test substances and to determine the physical and chemical properties of substances.

Mass of sample is not given, so we cannot calculate the heat added to the water sample.

Then, each group of students received the necessary materials to complete the experiment. When the students received the cups, they labeled cups to distinguish between the salt solution, distilled water, and control group. After weighing the cups and finding the mass of the cucumbers, the students poured 50 ml of water in one cup, 50 ml of salt solution in the other, and left the control cup empty. Then, the students placed the cucumbers into the cups and waited 30 minutes for the results. After the 30 minutes, the students removed the cucumbers from each solution and dried the cucumbers with paper towels. The students then weighed the cucumbers again and recorded their results. Lastly, the students found the difference from the original mass of the cucumbers and recorded their results.

b) An empty beaker was weighted. Then, water was filled in the beaker. The temperature was recorded at uniform intervals.