# CHM 130 Lab 4

Good Essays
1761 Words
Grammar
Plagiarism
Writing
Score
CHM 130 Lab 4
CHM130

Lab 4

Calorimetry

Name:

Data Table: (12 points)

ALUMINUM METAL

Pre-weighed Aluminum metal sample mass (mmetal)
20.09 g
Temperature of boiling water and metal sample in the pot (Ti(metal))

dsdfa(Ti
99°C
Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water))
24°C
Maximum Temperature of water/metal in calorimeter after mixing (Tf)
28°C

Pre-weighed Lead metal sample mass (mmetal)
20.03g
Temperature of boiling water and metal sample in the pot (Ti(metal))
103°C
Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water))
25°C
Maximum Temperature of water/metal in calorimeter after mixing (Tf)
26°C

IRON METAL

Pre-weighed Iron metal sample mass (mmetal)
19.99g
Temperature of boiling water and metal sample in the pot
(Ti(metal))
101°C
Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water))
25°C
Maximum Temperature of water/metal in calorimeter after mixing (Tf)
26°C

Calculations (show work for all calculations)
Aluminum Sample:
1. Calculate the change in temperature for the water caused by the addition of the aluminum by subtracting the initial temperature of the water from the final temperature of the water. ΔT = Tf - Ti (5 points)

ΔT = 28°C – 24°C = 4°C

2. Calculate the change in the metal’s temperature by subtracting the initial temperature of the aluminum from the final temperature of the aluminum. ΔT = Tf - Ti (5 points)

ΔT= 99°C – 28°C = 71°C

3. Determine the mass of the water by using the water’s density (specific to the initial temperature) and the volume of the water. Remember, density =mass/volume. You can look up the density of the water at your specific temperature at http://www.ncsu.edu/chemistry/resource/H2Odensity_vp.html. (5 points)

Density =mass/volume.

Density of water according to NCSU: 0.9972995 g/mL
Volume of water: 75.0 g/mL
Find mass: Mass = Density * Volume

Mass = 0.9972995 g/mL * 75.0

## You May Also Find These Documents Helpful

• Satisfactory Essays

Calorimetry is the measurement of the quantity of heat exchanged during chemical reactions or physical changes. For example, if the energy from an exothermic chemical reaction is absorbed in a container of water, the change in temperature of the water provides a measure of the amount of heat added.…

• 490 Words
• 2 Pages
Satisfactory Essays
• Better Essays

While waiting on the water to boil, retrieve a piece of unknown metal to be identified and record its ID letter and its mass. Once the mass of the unknown metal is recorded, put the metal into the boiling water. While waiting on the water and the metal to achieve the same thermal equilibrium, get a coffee cup and measure its mass. Then pour about 50mL of water into a coffee cup, measure the mass of the water and the coffee cup and then determine the mass of the water alone (mass of water and coffee cup – mass of coffee cup). Record the temperature of the boiling water on the hot plate with the metal and then record the temperature of the water in the coffee cup before adding the metal. Use the string attached to the metal to transfer the metal from the hot water bath to the calorimeter. Using a piece of cardboard to cover the top of the calorimeter, record the temperature of the water in the calorimeter. Repeat the experimental procedure three more…

• 1030 Words
• 5 Pages
Better Essays
• Good Essays

1. Calculate the energy change (q) of the surroundings (water) using the enthalpy equation  qwater = m × c × ΔT.  We can assume that the specific heat capacity of water is 4.18 J / (g × °C) and the density of water is 1.00 g/mL.  The water has absorbed the heat of the metal. So, qwater = qmetal…

• 736 Words
• 5 Pages
Good Essays
• Good Essays

The isotopes of an element have the same amount of protons, but a different amount of neutrons, so they vary in size.…

• 920 Words
• 7 Pages
Good Essays
• Satisfactory Essays

Our objectives are to measure the static and kinetic frictional forces using force sensors. Also, to determine the coefficient of static and kinetic frictional forces, amd the relationship between the frictional forces.…

• 288 Words
• 2 Pages
Satisfactory Essays
• Good Essays

1. Calculate the mass of zinc chloride produced. You know the original mass of the beaker. You also know the mass of the beaker plus the product you produced, which is zinc chloride. The difference…

• 1376 Words
• 6 Pages
Good Essays
• Good Essays

1. Measure out approximately 200 mL of distilled water and pour it into the calorimeter. Stir carefully with a thermometer until a constant temperature is reached. Record the volume of water and the constant initial temperature of the water on your data table.…

• 890 Words
• 4 Pages
Good Essays
• Powerful Essays

The energy it takes to raise the temperature of 1 gram of a substance by one degree Celsius.…

• 895 Words
• 4 Pages
Powerful Essays
• Satisfactory Essays

HSM 230 Week 6 DQ 1Post your response to the following: List examples of tangible and intangible forms of organizational culture. Which form of organizational culture is the most powerful agent for influencing ethical behavior by employees in human service organizations? Justify your answer.…

• 394 Words
• 2 Pages
Satisfactory Essays
• Good Essays

5) would be doing no work on your You are on the side of a hill with a topo map of the region. If you walked so that your trip follows a topo line you backpack. Why?.…

• 804 Words
• 5 Pages
Good Essays
• Good Essays

Chemical kinetics, which can also be explained as reaction kinetics, studies the rates of chemical processes and reactions. A lot of this has to do with the speed at which a chemical reaction occurs for instance the rate at which reactants and products appear and disappear. In this case chemical kinetics goes further in depth to understand what conditions affect the rate of a given reaction. This is important because it allows scientists to determine what type of reaction can occur, and how they can alter the outcome under varying conditions. Gasoline and diesel for example have two very different reaction rates when exposed to a spike in temperature. If you were to light gas on fire it would instantaneously explode igniting fumes in the air as well, however diesel has a much higher ignition temperature allowing it to slowly burn if lit. These two types of fuel are an example of the differences in reaction rate. To determine the rate at which these reactions occur we use the rate law: r=kAxBy. In this equation we are looking to solve for the rate of the reaction “r”, the k value which represents our rate constant is simply the value which quantifies the speed. As for the [A] and [B] values they are the concentration of the species A and B which respectively are raised to the “x” and “y” power. The “x” and “y” values are the respective stoichiometric coefficients that must be determined experimentally. The primary goal essentially for this experiment is to determine the k value or rate constant along with the x and y stoichiometric coefficients given the concentrations of Crystal Violet and Hydroxide. This can be obtained using a spectrophotometer to determine rate of absorbance then graph the rate find a line of best fit, determine our rate constant, then finally solve for our x and y in the rate law equation. Beer’s law also known as Beer-Lambert law relates the absorption of light to the properties of the material through which the…

• 830 Words
• 4 Pages
Good Essays
• Powerful Essays

We were given KOH and KNO3 as our salts. We weighed the calorimeter and water then subtracted accordingly o get the mass of the calorimeter and that of the water. The lab instructed on the amounts of water and salt to be used. The initial temperature of the water in the KOH reaction was 22.8 degrees Celsius and the final temperature of the mixture determined from the graph was 37.0 degrees Celsius. The graph of the KOh showed it to be an exothermic salt and the KNO3 to be and endothermic salt because of the change in the temperature indicating either absorbing or giving off of heat by the salts. This the change in temperature of the solution of the KOH and water is + 28880 J and the heat change of the salt is 82.6 J. Thus the total heat change, in the reaction is -2960 J. To determine the DeltaHs (J/g salt), divide the totalt heat of change by the measure mass of the salt resulting in -590 J/g. The same process was followed for KNO3 but this solution had a -5.9 degree Celsius temperature change this producing a negative total heat change of water and the slat in the solution giving a +13000 J in the reaction. DeltaHs is then determines to be 250 J/g. The expected value of DeltaHs of KNO3 is +354 J/g and for KOH, -1026 J/g. The error for the KNO3 is -27.5% and for the KOH it is 42.5%. These errors are high but not uncommon for the experiment. They are caused because the salts are in a solid form and thus after the peak of temperature of solution is found, the remainder of the graph is flawed because salt is still in the process of dissolving. This dissolving still of the salts is giving off or absorbing heat thus making the extrapolated change in the temperature of solution to be small. The temperature of solution being too small results in the total heat change being too small, giving the DeltaHs value as in the case of KOH too high (not negative enough) and in the KNO3…

• 1355 Words
• 6 Pages
Powerful Essays
• Better Essays

Another challenge arose since temperature change is affected by many factors which can leak heat in or out of the system. To overcome these challenges the temperature was taken over a period of 6 minutes total (2 before the mix, 2 during the mix, and 2 after the mix). This is to obtain a linear plot with small changes to determine the ΔT values.…

• 1034 Words
• 5 Pages
Better Essays
• Powerful Essays

UNIVERSITY OF PRETORIA UNIVERSITEIT VAN PRETORIA ` DEPARTEMENT OF CHEMISTRY DEPARTMENT CHEMIE DATE / DATUM: TIME / TYD: MARKS / PUNTE: 2008.05.30 120 min 80…

• 3151 Words
• 13 Pages
Powerful Essays
• Satisfactory Essays

Q.2 a) A 90 wt% Ag-10 wt% Cu alloy is heated to a temperature within the b + liquid phase region. If the Composition of the liquid phase is 85 wt% Ag, determine: (a) The temperature of the alloy (b) The composition of the b phase…

• 272 Words
• 2 Pages
Satisfactory Essays