Scientific Method Lab Report

1.) Measure out 20ml out of the water and place it into a glass beaker

Pour approximately 50 mL of room-temperature distilled water into the glass beaker by using the estimated volume on the beaker.

To start off the lab we did simple measurements with two different rulers, both measuring in centimeters but had different amounts of divisions on the second one making its measurements more precise. The first item to measure was a 13 x 100 mm test tube, again using the two different ruler’s metric ruler A and metric ruler B. After recording the measurements with the accurate rounding, we did the same steps to measure the diameter of a watch glass and an evaporating dish.

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

First, we added water to the graduated cylinder to 20 mL. Then, placed the unknown substance in the water, the water increased and measured 25 mL. The volume was determined by subtracting 20 mL from 25 mL. The volume equaled 5 mL for the unknown substance. Next, we filled the water to 20 mL in the graduated cylinder. Then, placed aluminum in the water, the water increased and measured 25 mL. The volume was determined by subtracting 20 mL from 25 mL. The volume equaled 5 mL for aluminum. After that, we added water to the graduated cylinder to 20 mL. Then, placed the zinc in the water, the water increased and measured 22.5 mL. The volume was determined by subtracting 20 mL from 22.5 mL. The volume equaled 2.5 mL for zinc. Last, we added water to the graduated cylinder to 20 mL. Then, placed lead in the water, the water increased and measured 24 mL. The volume was determined by subtracting 20 mL from 24 mL. The volume equaled 4 mL for

Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel, which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric measurements were the basis of the 3rd part of the experiment. It was displayed during this experiment that a pipet holds about 4mL and that there are approximately 27 drops/mL from a short stem pipet. Part 4 introduced the student to measuring

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.

Procedure : Watch each part of the experimental demonstration and make predictions about what will happen in each scenario.

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.

56.78 g 60.33 g 56.78 g Initial measurement of water in the graduated cylinder 60.7 mL 62.3 mL 58.5 mL 57.2 mL Measurement of the graduated cylinder after metal #8 is added 67.3 mL 68.9 mL 65.3 mL 64.1 mL Volume 6.6 mL 6.6 mL 6.8 mL 6.9 mL Density 9.1 g/mL 8.6 g/mL 8.9 g/mL 8.2 g/mL IV. Calculations: 96.3 mL of water were in the Styrofoam cup.

Using your textbook as a reference, write down the steps of the scientific method in the correct order.

For this lab we used two techniques which were the water displacement technique and filling a pipet all the way up 1. For the water displacement technique you need to first fill the graduated cylinder to an approximate measuring point. Then, you tilt the graduated cylinder and place the solid into the graduated cylinder. Finally, subtract the measurement with the solid in it to the starting place of the liquid 2. To fill a pipet all the way up you first need to place the pipet in the liquid and let go of the tip to let it fill up.

* By using the dropper and measuring cylinder, an amount of 5ml milk was placed in the test tube

Dependent: The dependent variable in this experiment is the water level inside the beaker. Control: The original water level, the type of candle, the position of the candles, the unit of measurement used to measure the water level and the temperature of the room are all control variables in this experiment. HYPOTHESIS: An increase in candles lit under the beaker results in a rise in water level.

As well as that they have to convert their height in different units of measurement (centimeters, inches, feet, and meters). Afterward, the graduated cylinder needs to be used to measure the volume. The volume of water can be determined by pouring all the liquid contained in the soda can into a graduated cylinder. In order to obtain the volume of the water in millimeters, the meniscus has to be read properly. As well as that the amount of volume needs to be converted to fluid ounces and then the millimeters per fluid ounce