CHEM115 LAB 2 THICKNESS OF FOIL

Fill in the following blanks. As the dye concentration increases, the absorbance of the light       [linearly increases, linearly decreases, exponentially increases or exponentially decreases]. The dye concentration units are [molar (M), millimolar (mM) or grams per liter (g/L)]  . Although most people wrongly conclude that absorbance has units nm, in fact, absorbance is unitless. This is because it results from a ratio of light through a colored sample relative to light intensity through a clear (blank) sample.  The units for the slope of the graph would be       [mM, 1/mM or nm]  . Hint: the slope is the change in y values divided by the change in x values. The units for the y-intercept of the graph would be       [nm, nM or unitless]  . The value for the slope of the line that describes the absorbance data is       [6.4597 or 0.0008]  The value for the y-intercept of the line that describes the absorbance data is       [6.4597 or 0.0008]  .

Briefly define the phrase “fit-for-purpose” in relation to analytical chemistry.

student found a bottle of unknown origin in the basement of an "CAUTION—contains С₁H₁O.” No other A old house. The bottle was labelled information was given, but inside the bottle were some white crystals. The student took the bottle to a chemistry laboratory, where she analyzed the crystals with the help of the laboratory staff. C₁2H₁6O reacted with Br₂ in CCl4 adding one mole of Br, and forming C₁₂H₁OB2₂. When a sample of C₁₂H₂O was reacted with O3 followed by Zn/H₂O, two different samples, J and K, were obtained. Compound J had a molecular formula of C.HgO₂, and its NMR is shown below. Compound K had a molecular formula of C₂H₂O, and it could be oxidized to compound L, with a molecular formula of C₂H₂O₂. The IR spectrum of L showed a very wide, strong band centred around 3000 cm*¹. The NMR spectrum of L showed only two different absorptions: a doublet (6H) at 0.9 ppm and a septet (1H) at 3.6 ppm. There was also a singlet (1H) off the scale at 11.8 ppm. students, deduce possible…

デジタル形式で段階的に解決 ありがとう!! SOLVE STEP BY STEP IN DIGITAL FORMAT Structure of Metal Materials: 8. A colleague calculated the density of iron with BCC structure using the following data of atomic radius equal to 1.24 Angstrom and atomic weight of 55.85 as follows: p = [(4 atoms / C. U.) x (55.85 g/atomic weight)/(atoms/atomic weight) / [2(1.24x108 cm)/√2]³ p = 68.8 g/cm³ Is the result obtained logical? Explain and justify your answer.

More than 40% of the world's population has limited access to clean water. One proposed method for the production of clean water involves removing salt from seawater. Which technique would be used to separate the salt from the salt water mixture?     a)   chromatography     b)   fractional distillation   c)     filtration     d)   simple distillation

A new compound has the empirical formula GaCl2. Thissurprises some chemists who, based on the position of gallium in the periodic table, expect a chloride of gallium to have the formula GaCl3 or possibly GaCl. They suggest that the “GaCl2” is really Ga[GaCl4], in which the bracketed group behaves as a unit with a -1 charge. Suggest experiments to test this hypothesis

4. (Also can you explain what is meant by determinant error)

Is the underlined part of the macroscopic domain, or the microscopic domain of chemistry ? A carbon atom has 6 protons, 6 neutrons and 6 electrons.

Five calcite, CaCO3CaCO3 (MM 100.085 g/mol), samples of equal mass have a total mass of 12.1±0.1 g12.1±0.1 g. What is the average mass and absolute uncertainty of calcium in each sample? Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.

The element rubidium consists of two isotopes, one having an isotopic mass of 84.912 and the other having an isotopic mass of 86.920.  Determine the percentage abundance of the lighter isotope.  Record your answer, to the correct number of significant figures, in the box below; do not include the units of your final answer.  Then show your numerical set-up(s) in the next question.