Question

1) Barium may react with oxygen gas to produce Barium oxide. a. Produce a balanced chemical equation for this reaction (be sure to include state symbols) b. In your equation, state which element was reduced and which element was oxidized and why. c. If 3 moles of Oz gas was used in this reaction, calculate how many moles of barium would be needed and how many moles of barium oxide would be formed? d. Showing all working, calculate the mass of barium oxide which would be expected in part c above? e. Showing all working, determine what mass of barium and what mass of oxygen gas is required to form 76.5g of barium oxide. 2) a. What is the difference between an endothermic and an exothermic reaction, and b. Draw an energy profile diagram of an exothermic reaction c. What would be the effect of a catalyst on any reaction? On your diagram above, show the effect that a catalyst would have on your reaction.

Answer 1

"a. ZBackgt 04 (9) ►? B108) 2Ba to abao " (0) 12) (-2) Ba is converted to Ba 27 So, Barium ºs oxidised Oy is converted to 02- so, oxygen Ps reduced (2 Ba (s) + O2(g) → a Bals)) x3 6 Ba + 3 ) ) 6 BaO, . (5) 3 moles of gas was used in reaction then sex moles of Baricem is needed and six moles of Baolum oxide are formed. do from pasti e six moles of Barium oxide are formed one mole of Bao weighs - 153°3279 Six moles o Bao weighs - 6x153.3279 -1919.92691 & Ba + O2 → 2 Bao 2x 137:327 329 28153.327 → 2x137:3279 of Ba gives 2x 153-327 g g Bao qof Ba gives 76.599 Bao 2x 137327 X 76.5 * 16 = 68.52g ) so (68.529 of Bagives 76.5g of Bao 2x153.327 → 82 g of or gives 2x153-329 g of Bao - gore og gives 76.5 gg Bad 32x765 (2x 153 327 ) = (1.98 g f og gives 76.5g of Bad/

Q. If a chemical reaction absorbs energy to gpve products then it is called endothermic reaction. The energy og products is always less the greater than energy of Teacrents in endothermic reaction of a chempcal Teachon et liberates energy to give moduct then it is called eroneomic reaction The energy product Ps always less than energyd Seacters in Erother mfc seaction Energy Producto Energy Reactent Reactents products Reaction coordinale Reaction co-ordinate Erothermit Endothermic co Catalyst decreases the activation energy So, Ine Teacefon proceed in a faster way. without Catalyst without Catalyst Luathcatalyst with catalyst Energy produce Energy/ Reactents Reaction co-oocl poate Reaction co-osdinale Exothermic Endothermic