1 Explain the difference between a scientific law and a scientific theory 2 What is the SI unit of mass Length Volume Time 1 3 a A graduated cylinder has a mass of 116 97 g A piece of metal is then placed in the graduated cylinder and the total mass reads 157 76 g The piece of metal is then removed A volume of 125 mL is added to the empty graduated cylinder The metal is then replaced and the new volume reads 128 6 mL Calculate the density of the metal b The density of water is 1 00 g mL Does the piece of metal float sink or suspend in the water Justify your answer c Convert the density you found in part a to megagrams per cubic meter Mg m3 d What volume would a 150 g sample of the same metal occupy in mL Express your answer in scientific notation 4 1 lb is equal to 453 6 g If the correct dosage of a drug is 1 23 mg of drug per kg of body weight how much of the drug should be given to a person weighing 175 lbs 5 Identify the experimenter associated with the following and a brief description of how 2 they changed the view of the atom a Oil Drop Experiment b Chocolate Chip Plum Pudding Model c Gold Foil Experiment d Indivisibility Indestructibility e Hydrogen Model Orbits 6 Consider the following species For each give the number of protons P the number of electrons E and the number of neutrons N a Bromine with a mass of 80 amu and a net charge of 1 b Sodium with a mass of 24 amu and a net charge of 1 c Carbon with a mass of 14 amu and a net charge of zero 7 a Which element in the second period is most likely to form an ion with a charge of 2 b Which element in the seventeenth group is the smallest in terms of mass in amu What charge would you expect it to have in an ionic compound 8 Write the formula for the following substances a Cesium nitrate b Calcium phosphite c Dinitrogen pentoxide d Lithium fluoride e Copper II sulfate pentahydrate 9 Write the name for the following substances a K2CO3 b Ni OH 2 c NH3 d NH4 3P 10 A new element is discovered and named element X A representative sample of 10 atoms of element X is taken 2 of the atoms have a mass of 399 amu 3 of the atoms have a mass of 404 amu and 5 of the atoms have a mass of 409 amu Calculate the average mass of element X 3 11 There are two known isotopes of Nitrogen 14N and 15N If the average mass of Nitrogen is 14 007 amu calculate the percent abundance of each isotope 12 A 6 57 g sample of an unknown organic compound containing carbon hydrogen and oxygen is burned in the presence of oxygen gas to produce 3 94 g of water and 9 63 g of carbon dioxide a Determine the empirical formula of the compound 4 b Given that the molecular weight of the compound is 180 2 g mol determine the molecular formula of the compound c Write a balanced chemical equation for the situation described above in part a d Using the reaction you wrote in part c calculate the mass of water that would be produced if 57 3 g of the organic compound reacts with 15 4 g of oxygen gas 13 A compound containing carbon hydrogen nitrogen and oxygen is analyzed It is determined that the compound contains 49 48 carbon 5 19 hydrogen and 16 48 oxygen by mass a Determine the empirical formula of the compound 5 b If the molecular weight of the compound is 194 19 g mol what is the molecular formula of the compound c How many nitrogen atoms are in 0 351 kg of the compound d How many moles of the compound are there if there are 9 11 x1031 carbon atoms in a sample of the compound 6 14 C3H8 g O2 g CO2 g H2O g a Balance the reaction b If 10 3 g of C3H8 react with 15 1 g of O2 i Determine the limiting reagent ii Calculate the maximum mass of CO2 that can be produced iii Calculate the mass of excess reagent iv If only 6 10 g of CO2 are produced calculate the percent yield c What is the mass percent of carbon in C3H8
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