H₂O2 +21+2H+ → 2H₂O + 1₂ Select the false statement and explain why: a) d[H+] 4v=-2- dt b) c) d) d[1₂] dt = -2v = d[H₂O₂] dt d[H₂O₂] dt d[I] dt d[1₂] dt
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- Which reaction is most likely to have a positive ASys? a) SiO2(s) + 3 C(s) b) 6 CO2(g) + 6 H¿O(g) c) CO(g) + Cl2(g) d) 3 NO:(g) + H2O(1) 2 HN0;(1) + NO(g) SiC(s) + 2 CO(g) - CH12O6(8) + 6 O2(8) - COCI2(g)Hello, can answer the question and could you please write out the full chemical reaction and the state of matter for each compound. Benzoic acid, HC7H5O2, and its salts are used as food preservatives. Ka for benzoic acid is6,3 x 10–5. A solution of sodium benzoate, NaC7H5O2, in water has a concentration of0,015 mol.dm–3. (a) What is the equilibrium concentration of benzoic acid in the sodium benzoatesolution?Mg (s) + ½O2 (g) → MgO (s) (1)This equation can be obtained by combining equations (2), (3) and (4) below:MgO (s) + 2HCl (aq) → MgCl2 (aq) + H2O (l) (2)Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g) (3)H2 (g) + ½ O2 (g) → H2O (l) (4) Combine equations (2), (3) and (4) to obtain equation (1).
- Determine the AH of the reaction 1 1 NO29) + 702c9) +5H20(9) → HNO3(aq) 4 AH = 33.2 kJ 5 N2c9) + O2cg) → N02c9) 1 Haa) +Nzo) +0zc) → HNO3(aq) AH = -202.3 kJ 1 H2(g) - ΗΝO3(αq) 1 H2(g) * 2 → H20(g) AH = -285.8 kJWhat is the observable result of: Cl + Ag AgCl(s) + 2NH3(aq) AgCl(s) + sunlight Br+AgNO3 AgBr(s) + sunlight AgBr(s) + 2H3(aq) (HERE) CO3 2- + dil. HCl(aq) (HERE) CO3 2- + Ca(OH)2 (HERE) CIO + red lithmus paper CIO + blue lithmus paper (HERE) Agl + 2NH3 Agl + Sunlight (HERE) Cl- + Cl2 + Hexane Br- + Cl2 + Hexane I- + Cl2 + Hexane Acidified K2Cr2O2 Choices: - white precipitate - colorless solution - gray precipitate - pale cream - gas/fumes - milky suspension - blue to white - pale yellow precipitate - 2 layered colorless solution - 2 layered purple solution - 2 layered orange solution - green solutionA chemist measures the enthalpy change AH during the following reaction: 8 SO,(9) + 16 H,S(g)→3 Sg(s) + 16 H,O(1) AH=-1863. kJ Use this information to complete the table below. Round each of your answers to the nea reaction ΔΗ 3 S, () + 4H,0(1) – 2s0, (2) + 4H,8 (g) 250, (g) + 4H,S (g) kJ
- The lead-acid storage battery is the oldest rechargeable battery in existence. It was invented in 1859 by French physician Gaston Plante and still retains application todaY, more than 150 years later. There are two reactions that take place during discharge of the lead-acid storage battery. In one step, sulfuric acid decomposes to form sulfur trioxide and water: H, SO,() – SO;(9) + H,O() AH-+113. kJ In another step, lead, lead(IV) oxide, and sulfur trioxide react to form lead(II) sulfate: Pb(s) – PbO,(s) - 2 S0, (g) → 2 PbSO,(s) AH= -775. J Calculate the net change in enthalpy for the formation of one mole of lead(II) sulfate from lead, lead(IV) oxide, and sulfuric acid from these reactions. Round your answer to the nearest kJ.What characterizes an electrolytic cell? What is an ampere? When the current applied to an electrolytic cell is multiplied by the time in seconds, what quantity is determined? How is this quantity converted to moles of electrons required? How are moles of electrons required converted to moles of metal plated out? What does plating mean? How do you predict the cathode and the anode half-reactions in an electrolytic cell? Why is the electrolysis of molten salts much easier to predict in terms of what occurs at the anode and cathode than the electrolysis of aqueous dissolved salts? What is overvoltage?74 CHu + 2 Oze) CO2ig) + 2 H2O1n COue) +2 H;0n CHe) + 2 Oze) 2 C,H180 + 25 Ozug) 16 CO) + 18 H;Og 2 CH,OH, + 3 0ze) → 2C0u9+4H;0µ Which of the following is an endothermic reaction? * 2 C3H18(1) + 25 O218) → 16 CO218) + 18 H2O(g) 2 CH3OH) + 3 O2«) - 2 CO2e) + 4 H,O CO2ne) + 2 H2O) CHẠE) + 2 O2ie) CH4(g) + 2 O28) CO26) + 2 H2O)
- (1) two baking sheets are made of different metals. you purchase both and bake a dozen cookies on each sheet at the same time in your oven. you observe that after 9 minutes, the cookies on one sheet are slightly burned on the bottom, whereas those on the other sheet are fine. (you are curious and you vary the conditions so you know the result is not caused by the oven.) (a) how can you use this observation to infer something about the specific heat of the materials in the baking sheets? (b) what is the mathematical reasoning (equation) that you need to support your conclusion?What is true for this chemical reaction: 3CO(g) + Fe₂O3(s) = 3CO₂(g) + 2Fe(s)? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b C AHxn> 0; ASxn > 0 AHxn 0 AHxn 0; ASxn <03 Draw labelled energy level diagrams for the following reactions: a S(s) + O₂(g) → SO₂(g) AH = -297 kJ mol-¹ b 6C0₂(aq) + 6H₂O(l) → C6H₁206(aq) + 60₂(g) AH=+2800 kJ mol-¹ C6H₁206