Please answer all the questions from 1 to 6 with the right choice of answer. Answer all of them to get a thumbs up. DO NOT skip any of the questions or parts.

1. Perform the following conversions. a) 305 K = C b) 5.25 km = cm c) 765 mg = g d) 29 g = dg e) 43 ns = S f) 42.5C = K g) 14.05 amu = kg h) 25.8 kJ = cal 2. Evaluate the following expressions and report your answer to the correct number of significant figures / decimal places. Include the correct units in your answer. a) 1.523 km x 0.0720 km = b) 1.844 g + 2.1 g +8.99 g = C) 343.23 mL - 69.222 mL = d) 44.01 mm2 / 10 mm e) 20 mx 1.8 m x 5.25 m = 3. Round the following numbers off to the specified amount of significant figures (SF) a) 2 107 600 (3 SF) = b) 0.0056744 (2 SF) = c) 167.3 (1 SF) = d) 65.79 (2 SF) = e) 6348 (2 SF) = 4. Fill in the missing blanks in the table below Element Name Element Symbol Atomic Number Mass Number # of protons # of electrons # of neutrons Argon 44 Xe 20 5. Silicon has three naturally occurring isotopes. The isotopes are summarized in the table below. Fill in the missing blank in the table and calculate the average atomic mass of silicon. Isotope Relative Abundance Si-28 92.21 % Si-29 Si-30 3.09% 6. If 12.2 g of hydrogen reacts completely with 87.5 g of oxygen to form hydrogen peroxide (H2O2), then what is the percent by mass of hydrogen in hydrogen peroxide? 7. A 55.0 g sample of methane (CH4) is found to contain 40.1 g of carbon. What is the mass of carbon in a 37.8 g sample of methane? 8. Provide the chemical formulas for the following compounds. a) Lithium phosphide: b) Gallium telluride: c) Lithium carbonate: d) Carbon tetrachloride: e) Tin (iv) oxide: 9. Provide the IUPAC name for the following compounds. a) CaBrz: b) A12S3: c) Mg(C102)2: d) Cu3P2 H2S: 10. Balance the following chemical reactions a) Fe + Cl2 FeCl3 b) NH3 + 02 + NO + H2