Aluminum Foil Lab

The purpose of this lab is to find if the mass changes when you galvanize and put a penny in the flame of a Bunsen burner introducing it to heat. In this lab, you galvanize eight pennies to silver and then heat up four of the silver pennies and make it into brass with the Bunsen burner. The independent variable in this lab is the penny because we have control over of what kind of penny we use rather it be new, old, dirty, or clean. The dependent variable in this lab is the mass of the penny because we are measuring the mass of each penny. Finally, the constant in this lab is the sodium hydroxide because; we use the same amount throughout the whole entire lab.

* There are drawbacks as well as benefits from the use of metals in structures.

In this lab experiment our main focus was to get skillful in using tools such as the metric ruler, balances, thermometer, and graduated cylinder to capture measurements of length, mass, temperature and volume. Additionally, this lab helped us to become more familiar with the uncertainty of measurements, as well as becoming efficient with rounding our measurements to the correct numbers of significant figures. Our results are measured consistently with rounding to the closest answer we could possibly acquire as the data can tell you.

11. Using the volume(s) you just calculated for regular vs. heavy duty samples as well as your dimensional measurements (length and width in cm) from Part IV of this experiment, calculate the height, or thickness, of each sample of aluminum using the formula V = l x w x h.  In the formula, V stands for volume, l for length, w for width, and h for height. Once again, you will have to use your algebraic skills to manipulate the formula, to solve for height.  You must show all your work. (15 pts)

The independent variable in the experiment was the mass (or amount) of the cheese and bacon balls.

A chef wants to see if the quality of bread (e.g., texture and appearance) is increased by

The independent variable for the experiment was the paper towels. The dependent variable was the absorbency and strength. The constants for the experiment were the size of the paper towels that were used, the amount of water, the size of the beaker, the size of the cylinder and the amount of the weight.

This purpose of this experiment is to calculate the thickness of a sheet of aluminum foil. This experiment is necessary because the human eye cannot accurately measure the small thickness of aluminum foil with only a ruler. However, to understand the procedure one needs to understand conversion, density, and volume. Conversion is when one converts one unit to another unit using a conversion factor(e.g. 2.54cm/in). Density is how much mass there is in a certain volume(density=mass/volume) and it stays constant in a substances and mixtures that have the same composition. Volume is the amount of space that an object occupies. The experiment will consist of weighing of aluminum foil, measuring the length and width, then converting these values

1. For this experiment, what were the independent variable and the dependent variable? What were the constants?

Alcoa created its aluminum using a process called Hall-Herould through electrolysis since aluminum is highly reactive, as I have mentioned before, and for this requires a high amount of energy. A single aluminum plant uses as much electricity as the city of Tacoma. The company is spending millions of dollars researching ways to use less power. It, however, still takes an average of 16,232 kilowatt hours to turn out a ton of aluminum, if we are to compare to another product, for instance steel would only need 77 for a ton. However, there is a reason to why Alcoa Intalco Works stays purely with aluminum as Isaac Bonell, a writer for The Bellingham Business Journal pointed out that “Aluminum is needed to build infrastructure, to manufacture cars and airplanes, to make high-tech medical equipment and to package your favorite chilled beverage. In the smelting industry, there is no shortage of customers.” Last year, on August 2016, the facility celebrated its 50th birthday in operation which was bittersweet because they were discussing shutting down some of their potlines again which mean layoff of over 400 employees as well. Unfortunately, energy crisis was not the only problem here but had to do with the global market prices of aluminum which makes Intalco unprofitable.

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

The experiment began by weighing out exactly 1.00 gram of aluminum foil. After this was measured, the aluminum foil was broken up into small pieces about 4-6 mm long and wide or smaller. Scissors were the most effective way of breaking up the aluminum foil and should be used rather than tearing individual pieces by hand. Once the foil is broken up, place the pieces in a 250 mL glass beaker. 25.00 mL of 3M KOH solution was measured out into a graduated cylinder. After 25.00 mL is measured, the solution was slowly poured into the beaker

2. The independent variable is thewater. The dependent variable is the candy. The controlled variable are the other materials used.

there could many different reason to get errors in the readings , the error which we have encountered and the assumptions made for calculations.

Variables: In this experiment, the temperature (in degrees Celsius) of the chemicals is the independent variable. To change the temperature, the materials are placed in a bath of water being heated by a hotplate.