The Effect Of Boiling Points Of Distilled Water And Water That Has Been Mixed With Our Everyday Table Salt

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

The only dependent variable is the time the ice cubes take to melt. The controlled variables are the size of the ice cube, and the room conditions they melted in. Aim: To see which type of ice cube melts faster (the one with or without sugar).

I will measure these individual alcohols by mass which will be measured in grams, I'll be making two readings of each alcohol before the experiment and after, which would tell me the mass lost and how much heat is produced. Dependent Variable, the things that I'll be measuring would be the temperature (oC) increase at the start and the final resting point once combustion has been stopped of each different alcohol being lit to heat the water in the copper calorimeter, and the mass before and after the experiment of alcohols. Fixed Variables, the things that I have chosen to keep the same in each individual experiment to keep it a fair test, is to keep the same amount of water being heated, the same copper calorimeter, as it may vary in conductivity, the height of the calorimeter, and the same amount of time for each

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

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.

The response earned a final point for the discussion of the ability of water to moderate temperature: water

In this experiment the scientists are looking for how gas production is effected when different sized Alka-Seltzer tablets are put into water. The independent variable is the different sizes while the dependent variable is the amount of gas produced. A constant variable includes the same brand of Alka-Seltzer tablets, the volume of water and same starting temperature. Finally the scientist’s control variable is the first trial testing the whole tablet comparing its reaction time to each new piece.

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.

The purpose of this experiment was to find the amount and percent of water in a hydrated salt. Hydrated salt contains water molecules chemically bound to it while anhydrous salt is a substance that fire can readily remove the water molecules. Using the gravimetric analysis method, the sample salt was measured, heated, and was measured again after cooled down to room temperature; this procedure allowed the weight of water lost in the salt to be obtained. After two trials, the water in the salt was determined to have an average percent water of -35.04%. The null hypothesis, the heat will not affect the amount of water lost, was rejected ,however, the alternative hypothesis, the heat will allow for there to be water lost, was not supported.

For our lab, we have six beakers of water. Three of the beakers contain high temperature water that range from 46 ℃ to 55 ℃, while the other three beakers contain room temperature water that range from 22 ℃ to 23 ℃. Then, we take six different colored Alka Seltzer tablets, and place them into the beakers one at a time. We record the length of time it takes for each Alka Seltzer to dissolve

As the temperature of water increases, the particles of solid Potassium chloride, KCl, which are absorbing energy from its surrounding, start moving more easily between the solution and its solid state because. According to the second law of thermodynamics, the particles will shift to the more disordered, more highly dispersed solution state. I predict that as the temperature of a KCl and water mixture increases, then the solubility of the KCl will also increase.

"There are several different kinds of relationships between variables. Before drawing a conclusion, you should first understand how one variable changes with the other. This means you need to establish how the variables are related - is the relationship linear or quadratic or inverse or logarithmic or something else" ("Relationship Between Variables ", n.d)

In this experiment, we investigate the change in temperature caused by adding a chemical substance into the water and dissolving it. The results recorded in the table below show that our hypothesis is correct.

Overall, the results mainly do support the original hypothesis. Throughout the 8 days of experiment, there was no lead, bacteria, or sodium detected by the test kits or the test strips that were used in any of the waters of the water bottle brands and tap water in both environments thus proving the hypothesis that was originally posed, correct. This was the same for the tap water from Quincy, Massachusetts in both environments, thus not supporting the original hypothesis of the belief of traces of lead or bacteria in the tap water of Quincy. However, the original pH estimates for the different types of water were not correct. The hypothesis about how pH balance would decrease in the cooler environment and increase in the warmer environment

In Part 1, I conducted a statistical experiment to determine if a linear relationship exists between each of my independent variables and my dependent variable, which were biological in nature. My independent variables were height (inches) and age (years). My dependent variable was weight (pounds). The goal of my experiment was to observe a linear correlation between an 18-22 year-old male’s height and weight. I collected my data by randomly selecting a sample size of 25 male individuals who attend Montclair State University. The best method of prediction would