Bell Work 1 / Terms Define and explain the difference between the following terms: Law and theory Qualitative and quantitative Hypothesis and conclusion

Bell Work 2 / Sig Fig’s How many Sig fig’s are in the following? 1.0 X 10^2 f. 11.030 0.00004302 g. 4.80 312.15 h. 0.23100 Perform the following operations, and express each result to the correct Sig Fig: 0.102 x 0.0821 x 273 3. 0.14 x 6.022 x 273= 1.01 2. 98.36 – 4.258 + 16.98 = 4. 1.230 x 10^5 0.29 x 10^4

Bell Work 3 / Phy and Chem Changes Label each property as either physical or chemical   ____________1. Sugar dissolve in water ____________2. A nail rust ____________3. A glass shatters ____________4. Iron and sulfur mix and form a partially magnetic black and yellow mixture ____________5. A piece of paper burns ____________6. Ability to combine with another substance ____________7. Dry Ice (solid carbon dioxide -- CO2) is sublimed at room temperature ____________8. Vinegar reacts when mixed with baking soda. ____________9. Zinc when immersed in Hydrocholoric Acid produces hydrogen gas ____________10. The cap is loosen on a soda bottle and you hear fizzing.

Bell Work 4 / Calibration curve 1. In your own words describe what a calibration curve is and how they are used?

Bell Work 5 / Solution Separation 1. List 5 types of solution separation that was covered in yesterdays video notes.

Bell Work 6 / Spectroscopy List the four types of spectroscopy from your notes. 2. What type of spectroscopy would be the best tool to analyze the concentration of the carotene macromolecule, which gives the orange color to carrots, in carrot juice? Why?   A. UV-Vis spectroscopy B. IR spectroscopy C. Mass spectroscopy D. Photoelectron spectroscopy 3. What type of spectroscopy would be the best tool to analyze a clear and colorless solution for the presence of a functional group like an alcohol group (-OH)? Why? A. UV spectroscopy B. IR spectroscopy C. Mass spectroscopy D. Photoelectron spectroscopy

Bell Work 6 / Empirical Formulas 1. A compound contains the elements copper and chlorine in a ratio of 1 mole of copper : 2 moles of chlorine. a. What is the empirical formula?   CuCl2 (my subscript is not working) b. What is the percent composition of copper? (show all work)   Cu = 63.6 63.6 / 134.6 = %47.25   Cl = 2 x 35.5=71.0 Total Mass = 134.6 g c. What is the percent composition of chlorine? (show all work)   71.0 / 134.6 = %52.75   d. If the molar mass is 269.2g what is the molecular formula of the compound?   269.2 / 134.6 = 2 Cu2Cl4 e. How many grams of copper would be in a 15.89 g sample of CuCl2 ? 15.89 x .4725 = 7.51 grams

Bell Work 7 / Formula for a Hydrate A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

Bell Work 4 / Quantitative and Qualitative Classify the following as: Quantitative or qualitative observations.   My eyes are blue. The reaction produced a bad smell. Your average in chemistry is 92.2% Physics is a difficult subject.