Exam # 1 Study Guide 1- Indicate in each of the following cases, if the change is a chemical change or a physical change: Ice patches melting on the side rock. __________ A bottle of soda erupting after shaking. __________ An iron bolt rusting in salt water. __________ CoCl2 * 6H2O is pink, but when heated becomes blue. __________ 2- A falsk 18.250 g when empty. If it is filled with dichlorobenzene , the flask and the dichlorobenzene weigh a total mass of 168.325 g. Dichlorobenzene is a liquid with a density of 1.305 g/mL. What is the volume of the falsk?3- What are the unit charge of the following particles. Electron α Proton βNeutron γ4- …………… form the nucleus of an atom and …………….orbits around a nucleus. 5- Indicate the number of protons, neutrons and electrons present in one atom of each of the following:copper-691737Cl6- How many moles of O are there in sample of 2.03 × 1023 atoms?7-What is the molecular formula for chloroform (White = hydrogen, grey is carbon, green is chlorine)? b. What is the mass percent of carbon in chloroform? 8-What is the mass percent of oxygen in iron (III) nitrate hexahydrate? CHEM 105 1st Edition9- Name the following: a) KClO4 b) CrO3 c) Cu2+ d) BaCO3 e) HCl f) SiO2g)HClO410- Write formula for the following (include the charge when appropriate): a) Chromium (III) oxide b) cesium hypochlorite c) Ti (IV) ion d) barium phosphate e) Copper (II) iodide f) Carbon tetrachloride11- Label the following elements as either metal, non-metal, or noble gasa. Rb ___________ b. P ___________ c. Ne ___________ d. Al ___________ e. Ge ___________ 12- Balance the following equations: a. P4O10 (s) + H2O (l) H3PO4 (aq) b. C6H10O5 (s) + O2 (g) CO2 (g) + H2O (g)13.How many moles of chlorine atoms are in 25 g of carbon? b) What is the mass in grams of 0.75 mol of chlorine? 14- In a chemical reaction, 37.9g of phosphorus combines with 130.0g of chlorine. Show your math. a. How many moles of Cl combined with the phosphorous? b. How many moles of Cl would combine with 30.97g of P? c. What is the empirical formula? d. If the molecular weight is 137.33 g/mol, what is the molecular formula? 15- Rust, which is an iron oxide (Fe2O3) can be removed from steel dipping it in hydrochloric acid (HCl). Fe2O3(s) + HCl(aq) FeCl3 (aq) + H2O a) Balance the molecular equation given above. b) Write a total ionic equation (constituents with charge) c) Write the net ionic equation, NIE (eliminating spectator ions)16- A laboratory analysis of a white powder used in paints, enamels and ceramics determined that the mass percent composition is Ba (69.58%), C (6.09%) and O (24.32%). What is the empirical formula of this compound?17- Bromine has two isotopes. The correct description comparing the two isotopes is that they different number of: A. Neutrons. B. Electrons. C. Protons. D. Same number of protons, electrons, and neutrons Avogadro number:The solubility rules [Lower numbered statements take precedence over higher numbered statements.] 1. All sodium, potassium, lithium and ammonium salts are soluble. 2. All nitrates, acetates and perchlorates are soluble [Ag(CH3CO2) is slightly soluble] 3. All silver, lead and mercury (I) salts are insoluble. 4. All chlorides, bromides and iodides are soluble. [HgI2 is insoluble, HgBr2 is slightly soluble] 5. All carbonates, phosphates, sulfides, and oxides are insoluble. 6. All hydroxides are insoluble. [Except Ba(OH)2 is soluble, Ca(OH)2 is slightly soluble] 7. All sulfates are soluble. [Except those of barium, strontium and
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