Numbers of Mole and Molarity Calculation of a Equation Questions

Question 1: The Mole (4 points)a. Match the following terms to their definitions. (2 points)A. Mole___ The number of items in a moleB. Molarity___ Mass of 1 mole of somethingC. Molar mass___ 6.02 × 1023 itemsD. Avogadro’s number___ Concentration of a dissolved substanceb. Match the following terms to their units. (1.5 points)A. Atomic mass___ mol/literB. Molarity___ amuC. Molar mass___ g/molc. What is the relationship between the atomic mass of an element and a mole of that element’s atoms? (.5 point)Question 2: Unit Conversions (2 points)Use the periodic table to answer the following questions. (Round atomic masses to the nearest tenth unit.)a. What is the molar mass of Fe(NO3)2? (.5 point)b. What is the number of moles of 27.6 g of lithium (Li)? (.5 point)c. What is the number of molecules of 140 g of CO? (.5 point)d. What is the molarity of 48.6 g of magnesium (Mg) ions in 2 L H2O? (.5 point)Question 3: Empirical and Molecular Formula (1 point)a. What is the difference between the empirical formula and the molecular formula? (.5 point)b. How does one determine the molecular formula from the empirical formula? (.5 point)Question 4: Percent Composition (3.5 points)a. How is the percent composition by mass determined? (.5 point)b. Determine the percent composition of each element in MgCl2. (1 point) i. Magnesium (Mg): (.5 point) ii. Chlorine (Cl): (.5 point)c. Calculate the empirical formula from the given percent compositions.82% nitrogen (N), 18% hydrogen (H) (2 points)Question 5: Chemical Equations (8 points)a. Identify the different parts of the chemical equation below. (2 points)A(s) + B(l) C(g) + D(aq)1. A: _________________________5. (s): _________________________2. B: _________________________6. (l): _________________________3. C: _________________________7. (g): _________________________4. D: _________________________8. (aq): _________________________b. Match each type of chemical reaction to the general form of the equation describing it. (2 points)A. Single replacement___ AB + CD AD + CBB. Decomposition___ AB + C CB + AC. Double replacement___ A + B ABD. Synthesis___ AB A + Bc. Use the activity series of metals to predict the products of the following single-replacement reaction. Explain your answer. (1 point)NiCl2 + Fe d. Use the solubility table to predict if a precipitate will form in the double-replacement reaction.CuSO4 + 2KOH Cu(OH)2 + K2SO4Explain your answer. (1 point)e. Label the states of each compound in the reaction below. (2 points)CuSO4( ) + 2KOH( ) Cu(OH)2( ) + K2SO4( )Question 6: Chemical Reactions (1.5 points)a. How can one tell if a chemical reaction is balanced? (.5 point)b. What information does a complete ionic equation give that the balanced equation doesn’t show? (.5 point)c. What information does a net ionic equation give that the complete ionic equation does not show? (.5 point)Question 7: Combustion (2 points)a. What two reactants are necessary in order for a hydrocarbon combustion reaction to take place? (.5 point)b. What three products are necessary in order for a hydrocarbon combustion reaction to take place? (.5 point)c. Complete the following combustion reaction. Write your balanced equation two different ways. (1 point)C8H18 + O2 C8H18 + O2 Question 8: Drawing Hydrocarbons (3 points)Use the pictures shown to identify three ways of drawing hydrocarbon molecules. Then write the molecular formulas. (1 point each)a. b. c.

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