6.03 Calorimetry Lab

Determine the volume of the magnet and metal bolt to +/- 0.1 mL using units and sig figs carefully. Measure the mass and calculate the density of the magnet and metal bolt using the correct significant figures and units. Show work for full credit. (2 points)

) Suppose that some magnesium oxide smoke had escaped during the investigation, the Mg:O ratio would have increased from 58% to 72%. The final mass of MgO would have decreased because the magnesium oxide smoke is part of the product and when some of it escapes, it decreases the final mass.

Care must be exercised as chemistry often contains wonderful surprises. Suppose the percent by mass experiment for an iron oxide results in 72.36% Fe by mass and 27.64% O by mass. Following the procedure above, results in a molar ratio of 1.296:1.727. Division by the lowest number, results in a mole ratio of 1:1.33. For cases like this, the next step is to multiply by the lowest whole number that converts each of the subscripts to a whole number. Thus the formula is Fe3O4. As iron has two oxidation states (+2, +3), the expected formula is either FeO of Fe2O3. Anytime a result that is inconsistent with expectations is obtained, the first and immediate step should be to recheck all the data and calculations. In this case, the results are real and Fe3O4 is a known compound often called magnetite. Understanding the oxidation state of iron in this compound

Step six: After this, they used the equation, Density = Mass/Volume, to find the density of the 100 g mass and recorded it onto the table.

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

Weight the mass for the different percent of zinc and copper mixtures, which have 11 groups.

Then the correct amount of each reactant had to be determined by turning .03 moles into grams and milliliters to use in the experiment.

Pour 10 grams of magic sand (sand with scothgard) and fine sand in a different container with 200 ml of water and after 30 seconds, get the sands from the container and measure the amount of water lost in the container. Repeat the last step 3 times.

The mass of the individual recovered components make up the total mass of the 1:1:1 mixture of Benzoic acid, Benzocaine, and Fluorenone. Because the ratio is 1:1:1, that means all of the components are equally weighted in the total weight of the mixture. Since the starting weight of the 1:1:1 heterogeneous mixture was 0.618 g, you can assume that the 0.618 g is made up of the three components each weighing 0.206 g. This came from dividing the starting weight by 3, since there are three components. As shown in the percent recovery calculations above the percent recovery of benzoic acid was 60.6 %, the percent recovery of benzocaine was 62.2% and the percent recovery of fluorenone was 59.7%. These percent recoveries are reasonable for the mixture

After we find the inverse of matrix A and use matrix multiplication, we are left with the mass information in table 4 below. This also allows us to calculate the weight percent of each species in the slag (found in table 5).

1. I started by pouring all of my ingrediants (nails,water,salt,oil,sand) into the measuring cup and wait for everything to settle.

percent by weight of the oceans and, as a constituent of most rocks and minerals,

=α+β. IRON

Coarse aggregate passing through 20mm and retained 10mm sieve was being used. Its fineness modulus specific gravity, water absorption and dry density are listed in table.

The cement-sand slurry used is of the proportion 1:2 with a water cement ratio 0.6. The percentage of fibres (by volume fraction) used in the experimentation is 6 % for mono fibres.