Question

1. Classify the following as an endothermic or exothermic reaction: a. Making popcorn in a microwave oven. b. Boiling water. 2. Balance each of the following equations. Classify each reaction as synthesis, decomposition, single-displacement, or double-displacement.? a. H + Bry → HB b. BaOx(s) H2SO4(aq) → BaSO4(s) + H2O2(aq) c, Ba(ClO 2 + Heat → BaCl2 d. Song) + O2(g) → SO, e. Na HO → NaOH + H2 3. Calculate the number of molest a. 2.10kg NaHCO3 b. 9.8 X 10* molecules CO2 c. 250mL ethyl alcohol C2H5OH (d = 0.789g/mL) 4. Given the unbalanced equation: H2SO4 + NaOH → Na2SO4 + H2O a) How many moles of NaOH will react with 17 mol of H2SO4? b) How many moles of Na2SO4 will produced when 21 mol of NaOH react? umber of moles - Given mass/Molecular mass %percent = (part/whole) * 100%

Answer 1

1. endotheemic reaction aboobs heat whereas exothermec reaction-releases heat Thus, @ Making popcorn - endotheempe as for the popcorns to pep, heat is absorbed ③ Bolling water- endo the mic

1. endotheemic reaction aboobs heat whereas exothermec reaction-releases heat Thus, @ Making popcorn - endotheempe as for the popcorns to pep, heat is absorbed ③ Bolling water- endo the mic

as water boils when heat is absorbed. 2. @ Hat Bry 24B8 Sy thesis - BaO₂ (s) + H2 504 (aq) : Basoa + H22 Cs cag) Double displacement: © BacC103) + Heat Bac + 302 Decomposition @ 2502(g) + 02 (9) >4803 (9) Synthesis © Na +2420 2Nach + H2 Single displacement: c cation displacement) Na replaces nog ho to give Naoy and

3. Mass og Nak CO₂ = 2.10kg. - 2.10 x 108 Molar mass og Narcoz = 84.0079/mol Moles of Halcoz = mass of Narcos Molar mass of Narcos = 2.10x10 g 84.007 olmal = 24.9979168mol - 25.0 mol © No of molecules = 9.8x107 Avogadro's constant- 6:022 x10 molecules 23 mol Nog meks og Ceza 9.8x1024 molecules 6.022 x 103 molseley mol = 16.2736632 mol = 16.3mal © volume of Calon = 250mL density of (2450M = 0.789 g/mL Mass of Guron volume of C21504 x Density of qugor

- 2050001 x 0.7899 =197.259 Molar mass of Ca 450H = 46.07g/mol Moles of C G OH = Mass of 24504 Molar mass of C2H5OH = 197.299 46.07g/mol = 4.28152811 mol = 4.28mol Hace 4. Balanced equalfen: H2SO4 + 2NaOH - Na₂SO4 + 2H2O ☺ Molaq nalto a Naon to H2904 S 2:1 Moles of Nacho Moles of H2SO4 x Molar rallo of Nach to H₂SO4 Cgiven moles = 17701) of 42509 - 1 mol M2804 x a mol Naok Imollys 04 = 34.0 mol

b) Molar natto of Na₂SO4 to Nook is 1:2 Moles of Na2SO4 = Moles of Naon x . Molar natto of Na₂SO4 to Noch (gruen: Moles of Naos = 21 mal) = Qimar Naokx i molna s04 anol Karls 1015 mol Na 304 =