5) NaOH 6) H3PO4 7) CuSO4 8) (NH4)2SO4 9. Written Explanation of Molar Conversion Problem: Convert 3.5 moles CuSO4 into grams. Part 1: Identification What is your known? _____________________________ What are you looking for? __________________________ What conversion factor will you use?_______________________________________________________ Part 2: Math… Solve the problem Part 3: Explanation Use the following content words to explain how you solved the problem: Known, unknown, convert, units, cancel, calculate, conversion factor, multiply, divide, setup _______________________________________________________________________________________________ 10) How many moles are in 21g of sodium fluoride, NaF? Unit 4 – Benchmark Gram/Mole/Volume Conversions – Practice!
calcium oxide + water aluminum + bromine Decomposition Reaction A single compound breaks down into its component parts or simpler compounds. Basic form: AX → A + X Examples of decomposition reactions: Metallic carbonates, when heated, form metallic oxides and CO2(g). EX. CaCO3(s) → CaO(s) + CO2(g) Most metallic hydroxides, when heated, decompose into metallic oxides and water. EX. Ca(OH)2(s) → CaO(s) + H2O(g) Metallic chlorates, when heated, decompose into metallic chlorides and oxygen. EX. 2KClO3(s) → 2KCl(s) + 3O2(g) Some acids, when heated, decompose into nonmetallic oxides and water. EX. H2SO4 → H2O(l) + SO3(g) Some oxides, when heated, decompose. EX. 2HgO(s) → 2Hg(l) + O2(g) Some decomposition reactions are produced by electricity. EX. 2H2O(l) → 2H2(g) + O2(g) EX. 2NaCl(l) → 2Na(s) + Cl2(g) Write the reactant formula, predict the product in words and write the product formula, then balance. ______NaCl ____Na + _____Cl2 ___ CaBr ___ Ca + ___ Br2
used to power some motor vehicles. THE combustion of propane is shown in the equation below. C3H8 + 5 O2 → 3 CO2 + 4 H20 The combustion of 100 g of propane produces 299.4 g of carbon dioxide. Assume the combustion of propane produces the same amount of energy per gram as the combustion of octane. c. Based on this information and your calculations, identify which fuel, octane or propane, is less harmful to the environment. Justify your answer. Worksheet: Writing and Identifying Equations CHEMISTRY: A Study of Matter Directions: a) Write balanced equations for the following word equations. b) In the blank to the left of the equation, tell if the equation is synthesis (S), decomposition (D), combustion (C), single replacement (SR), or double replacement (DR). _____ potassium chloride + silver (I)nitrate yields potassium nitrate + silver (I) chloride _____ iron metal + copper (II) sulfate yields iron (II) sulfate + copper metal _______________________________________________________________________________________________
C K2O and H2 D KOH and H2 Consider this reaction: 3Ca (s) (aq) (s) (g) How many moles of calcium are required to produce 60.0 g of calcium phosphate? A 0.145 mole B 0.194 mole C 0.387 mole D 0.581 mole 12/13/13 Methane (CH 4) is combusted/burned in oxygen according to this balanced chemical equation: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g) What volume of carbon dioxide is formed when 9.36 liters of methane are burned in excess oxygen at STP? A 9.36 L B 15.0 L C 18.7 L D 22.4 L 12/16/13 Which set of equipment would be most useful to determine the density of a liquid? A Balance and periodic table B Periodic table and graduated cylinder C Balance and graduated cylinder D Graduated cylinder and thermometer What is the volume of the liquid in the graduated cylinder? A 13.00 mL B 13.50 mL C 14.00 mL D 14.50 mL A student is given a container of potassium nitrate crystals. In order to determine the exact mass of the potassium nitrate using a triple beam balance, he must know the — A mass of the filled container and the chemical formula for potassium nitrate B mass of the filled container and the density of potassium nitrate C volume of the filled container and the volume of the potassium nitrate D mass of the empty container and the mass of the filled container 12/18/13 Iodine-131 is a radioactive isotope with a half-life of 8 days. How many grams of a 64 g sample of iodine-131 will remain at the end of 24 days? Copper sulfide is formed when copper and sulfur are heated together. In this reaction, 127 grams of copper reacts with 41 g of sulfur. After the reaction is complete, 9 g of sulfur remains unreacted. What is the mass of copper sulfide formed?