By Carl Lyman © September 2001 Jeopardy Template By Carl Lyman © September 2001

Midterm Jeopardy 2 100 200 300 400 500 MOF Reactions Stoichiometry Thermo 100 200 300 400 500

Credits That’s all folks. Exit

MOF $100 What is the molar mass of (NH4)2CO3? A.) 144 g/mol B.) 138 g/mol C.) 96 g/mol D.) 78 g/mol

MOF $100 C 96 g/mol Subscript must be multiplied in for parentheses N 2 x 14 = 28 H 8 x 1 = 8 C 1 x 12 = 12 O 3 x 16 = 48

MOF $200 What is the percent composition of chromium in BaCrO4? D.) 25.2 %

MOF $200 C 20.5% Ba 1 x 137 = 137 Part/Whole x 100 Cr 1 x 52 = 52 O 4 x 16 = 64 52 x 100 = 253 g/mol 253

MOF $300 What is the mass in grams of 5.90 moles of C8H18? A.) 0.0512 g B.) 19.4 g C.) 389 g D.) 673 g

MOF $300 D 673 g 5.90 mol x 114 g = 1 mol C 8 x 12 = 96 H 18 x 1 = 18

How many moles of silver atoms are in 1.8 x 1020 atoms of silver? MOF $400 How many moles of silver atoms are in 1.8 x 1020 atoms of silver? A.) 3.0 x 10-4 B.) 3.3 x 10-3 C.) 3.0 x 102 D.) 1.1 x 1044

MOF $400 A 3.0 x 10-4 mol 1.8 x 1020 atoms x 1 mol = 6.02 x 1023 atoms Don’t forget to use parentheses when plugging scientific notation into your calculator

MOF $500 Which of the following is NOT an empirical formula? A.) Sb2S3 B.) C2H8O C.) C2N2H8 D.) BeCr2O7

MOF $500 C C2N2H8 Empirical formulas are in lowest whole number ratio of atoms. C2N2H8 can be reduced to CNH4

CaSO4 + AlCl3  Al2(SO4)3 + CaCl2 Reactions $100 CaSO4 + AlCl3  Al2(SO4)3 + CaCl2 What is the coefficient of Al2(SO4)3 when the equation is completely balanced using the smallest whole-number coefficients? A.) 1 B.) 2 C.) 3 D.) 4

Reactions $100 A 1 3CaSO4 + 2AlCl3  Al2(SO4)3 + 3CaCl2 Balanced equations have the same number of atoms of each element in both the reactants and products. Only coefficients can be altered.

is an example of which type of reaction? Reactions $200 The equation 2C3H7 + 9O2  6CO2 + 8H2O is an example of which type of reaction? A.) single-replacement reaction B.) double-replacement reaction C.) decomposition reaction D.) combustion reaction

Reactions $200 D combustion reaction A hydrocarbon reacts with oxygen to produce carbon dioxide and water

is an example of which type of reaction? Reactions $300 The equation Mg(s) + 2HCl(aq)  MgCl2(aq) + H2(g) is an example of which type of reaction? A.) combination reaction B.) single-replacement reaction C.) decomposition reaction D.) double-replacement reaction

Reactions $300 B single replacement reaction The free element Mg replaces hydrogen in the compound HCl.

Reactions $400 A double-replacement reaction takes place when aqueous Na2CO3 reacts with aqueous Sn(NO3)2. You would expect one of the products of this reaction to be ________. A.) NaNO3 B.) NaSn C.) Sn(CO3)2 D.) CNO3

Reactions $400 A NaNO3 Na2CO3 + Sn(NO3)2  SnCO3 + 2NaNO3 Na and Sn trade places

Reactions $500 Predict the products: Mg + CuCl2  A.) No reaction B.) MgCu + Cl2 C.) Cu + MgCl2 D.) MgCuCl2

Reactions $500 C Cu + MgCl2 This is a single replacement reaction. It will occur because the free element Mg is higher in activity than the element it is replacing in the compound. Mg and Cu will be the ones trading places because they are both metals and have positive oxidation numbers.

Stoichiometry $100 6 CO2 + 6 H2O  C6H12O6 + 6 O2 What is the total number of moles of water needed to make 2.5 moles of C6H12O6? A.) 2.5 B.) 6.0 C.) 12 D.) 15

Stoichiometry $100 D 15 mol 2.5 = X 1 6 ← From original equation

2Pb(NO3)2(s)  2PbO(s) + 4NO2(g) + O2(g) Stoichiometry $200 2Pb(NO3)2(s)  2PbO(s) + 4NO2(g) + O2(g) How many grams of oxygen are produced when 11.5 grams of NO2 is formed? A.) 1.00 g B.) 2.00 g C.) 2.88 g D.) 32.0 g

Stoichiometry $200 B 2.00 g 11.5g x 1mol 0.25 = X 0.0625mol x 32g = 46g 4 1 1mol

Stoichiometry $300 2 C4H10 + 13 O2  8 CO2 + 10 H2O What is the total number of moles of O2 that must react completely with 5.00 moles of C4H10? A.) 10.0 B.) 20.0 C.) 26.5 D.) 32.5

Stoichiometry $300 D 32.5 mol 5.00 = X 2 13

Stoichiometry $400 4Fe(s) + 3O2(g) 2Fe2O3(s) How many grams of Fe2O3 are formed when 16.7 grams of Fe reacts completely with oxygen? A.) 12.0 g B.) 23.9 g C.) 47.8 g D.) 95.6 g

Stoichiometry $400 B 23.9 g 16.7g x 1mol 0.298 = X 0.149mol x 160g = 56g 4 2 1mol

Stoichiometry $500 Ca + F2  CaF2 What is the limiting reagent and what quantity of CaF2 results from the reaction of 3.00 g of calcium and 2.00 g of fluorine? A.) Ca, 4.78 B.) F2, 4.78 C.) Ca, 4.11 D.) F2, 4.11 E.) Ca, 3.22

Stoichiometry $500 D F2, 4.11 Determine how many grams of product can be made Ca 3g x 1mol 0.075 = X 0.075mol x 78g = 5.85g 40g 1 1 1mol F2 2g x 1mol 0.053 = X 0.053mol x 78g = 4.11g 38g 1 1 1mol F2 is the limiting reagent because it can make the least amount of product. The theoretical yield is the smaller amount of product made and is based on the amount made by the limiting reagent.

Which Kelvin temperature is equal to -73°C? Thermo $100 Which Kelvin temperature is equal to -73°C? A.) 100 K B.) 173 K C.) 200 K D.) 346 K

Thermo $100 C 200 K K = °C + 273 = -23 + 273

Thermo $200 The average kinetic energy of water molecules is greatest in which of these samples? A.) 10 g of water at 35°C B.) 10 g of water at 55°C C.) 100 g of water at 25°C D.) 100 g of water at 45°C

Thermo $200 B 10g of water at 55°C Temperature measures kinetic energy, the higher the temperature the higher the kinetic energy

Thermo $300 The specific heat of silver is 0.24 J/gºC. How much heat is needed to warm 4.37 g of silver from 25.0ºC to 27.5ºC? A.) 2.62 J B.) 0.14 J C.) 45.5 J D.) 0.022 J

Thermo $300 A 2.62 J q = mcΔT q = (4.37 g)(0.24 J/g°C)(27.5°C – 25.0°C)

Calculate the energy required to produce 7 moles of Cl2O7 Thermo $400 2Cl2 + 7 O2 + 543.4 kJ  2 Cl2O7 Calculate the energy required to produce 7 moles of Cl2O7 A.) 29.26 kJ B.) 271.7 kJ C.) 543.4 kJ D.) 1901.9 kJ

Thermo $400 D 1901.9 kJ 7 = X 2 543.4 ← From original equation

Thermo $500 Given the potential energy diagram of a chemical reaction: . . . (see image) Which arrow represents the potential energy of the reactants? A.) B.) C.) D.)

Category 4 $500 B A = activation energy C = P.E. of activated complex D = P.E. of products