A solution is prepared by adding 0.10 mol of chromium(III) nitrate, Cr(NO3)3, to 1.00 L of water. Which statement about the solution is correct? O The value of K, for the species in solution must be known before a prediction can be made. The solution is acidic. The solution is neutral. The solution is basic. The value of K, for the species in solution must be known before a prediction can be made.

Which of the following is a decomposition reaction? a. CH,(1) + O2(g) –CO2(g) + H,O(1) b. CO(g) + O2(g) –→ CO2(g) c. Cl2(g) + NaBr(s) → NaCI(s) + Br2(g) d. CACO3(s) → CaO(s) + CO2(g) O a O b O c none of the choices kindle DELE

4. For the reaction the product will be: a. 1 y 2 b. 2 c. 1 d. 4 e. 3

6. Count the number of elements on each side of the equation & write the total number down below. 3NAHCO;(aq) + C,H,OH(COOH);(aq)-C3H,OH(COONA)3(aq) + 3H,0(1) + 3CO,(2) Reactants Products Hydrogen Окудеn Carbon Sodium Hydrogen Окудеn Carbon Sodium

When 5.52 g sodium Na is mixed with 10 g Al;03 What mass of excess reactant remains at the end of the reaction? 6 Na (1) + Alz03 (s) --> 2 AI (1) + 3 NazO (s) Molar mass of Na: 23 gr/mol Molar mass of Al;03: 102 gr/mol Molar mass of Al: 27 gr/mol O a. 8.13 gr O b. 10.6 O. 5.92 gr O d. 2.01

Name: Hour: CH (CO3)-2 (OH)-- (SO.)-2 Na + Cl' (PO.)3 Na+1 Naz Co) Na OH Na(Sam) Nac(Par) NaCl (NH4)*- K*- Ca+2 Mg*A Zn 2 Fe*3 + CI" Fe (Cos) Fe*3 FeCl3 Al3 Co+3 H*-

While ethanol (CH,CH,OH) is produced naturally by fermentation, e.g. in beer- and wine-making, industrially it is synthesized by reacting ethylene (CH,CH,) with water vapor at elevated temperatures. A chemical engineer studying this reaction fills a 125 L tank with 33. mol of ethylene gas and 13. mol of water vapor. When the mixture has come to equilibrium she determines that it contains 24.6 mol of ethylene gas and 4.6 mol of water vapor. The engineer then adds another 17. mol of ethylene, and allows the mixture to come to equilibrium again. Calculate the moles of ethanol after equilibrium is reached the second time. Round your answer to 2 significant digits. dlo mol

1. Write the balanced chemical equations for the following reactions and identify the type of the reactions. (i) K,SO,(aq) + AICI;(aq) → Al;(SO);(aq) + KCI(aq) Туре: (ii) CH;OH(1) + O2(g) → CO2(g) + H;O(g) Туре:

Write the net ionic equation for the following: CaCla + NazCO; * Co.*- (aq) + Ca²* (aq) CACO: (s) Na (aq) + Cl- (aq)NaCl(s) Ca2+ (aq) + Na* (aq) – CaNa: (s) no precipitate forms Which of the following ionic reaction represents a complete ionic equation? I. Al,0, (s) + 6H* (aq) + 6C1O, (aq) → 2 Al3*(aq) + 6C10, (aq) +3 H, 0 (I) II. PbCr0, (s) → Pb2+(aq) + Cr0; (aq) III. Mg(OH)2 (s) + H2SO, (aq) → MgSO, (aq)+ 2 H20 (1) IV. H2CO, (aq) + 20H (aq)→ clo;- (aq) + 2 H,0 (I) II IV

26. The chemical reaction below is an example of what type of reaction: Mg(s) + H2SO4(aq) > MgSO4(aq) + H2(g) a. Combination b. Decomposition c. Single replacement d. Double replacement