This question is about chemical reactions and electricity.0 7 . 1 Electrolysis and chemical cells both involve chemical reactions and electricity.Explain the difference between the processes in electrolysis and in a chemical cell.[2 marks

Which statements correctly describe electrolysis?  During electrolysis:an electrochemical decomposition reaction occurs.electric current is supplied as the energy to perform an endergonic reaction.the electrochemical cell operates with a negative ΔG.electric current flows in a nonspontaneous direction within an electrochemical cell.A.I and IV onlyB.I, II, and III onlyC.II and IV onlyD.I, II, and IV only

In an electrochemical cell:a.Kinetic energy decreasesb.Potential energy decreasesc.Potential energy gets converted into electrical energyd.Chemical energy gets converted into electrochemical energy

1. Considering the difference between chemical reactions and nuclear reactions, which of the following statementsis FALSE?A. Chemical reactions release or absorb relatively small quantities of energy while nuclear reactions involvetremendous amounts of energy.B. Chemical reactions involve only electrons while nuclear reactions involve only neutrons and protons.C. Chemical reactions are affected by external factors such as pressure and temperature while nuclearreactions depend on the nature of the nucleus.D. Chemical reactions involve rearrangement of chemical bonds while nuclear reactions involve transformationof elements.2. Which of the following factors can affect the rate of a chemical reaction?A. The concentration of reactants.B. The color of the reaction mixture.C. The volume of the reaction vessel.D. The shape of the reaction container.3. Consider the reaction 2A+B→3C, which follows second-order kinetics. The initial concentrations are [A]₀ = 0.2 Mand [B]₀ = 0.3 M. After a certain time t, the concentration of C is measured to be [C] = 0.15 M. Which of thefollowing statements is correct regarding the concentrations of reactants A and B at time t?A. [A] at time t is less than 0.1 M, and [B] at time t is less than 0.2 M.B. [A] at time t is less than 0.1 M, and [B] at time t is greater than 0.2 M.C. [A] at time t is greater than 0.1 M, and [B] at time t is less than 0.2 M.D. [A] at time t is greater than 0.1 M, and [B] at time t is greater than 0.2 M.4. Study the given graph. Which region in the graph does alpha particle emission most likely occur?5. A reaction involving two reactants A and B has a total order of 2. Which of the following is likely to be the rateconstant for this reaction?A. 0.4278 M min-1B. 1.5134 M-1 s-1C. 0.0005232 yr-1D. 65.1405 M-2 s-16. Which of the following can block gamma radiation?A. shirtB. handC. a general chemistry textbookD. a slab of hollow block7. For the reaction A + B + C→ products, when the concentration of C is tripled, the concentration of B is doubled,and the concentration of A multiplied by a factor of 1/3, the rate increases by a factor of 9. Which of the followingis the correct rate law for the reaction?A. rate = [A][B][C] 3B. rate = [A][B][C]C. rate = [B]2 [C]D. rate = [A][C]38. How many neutrons are produced in the following fission reaction?23994 Pu(n,a)23692 UA. 0B. 1C. 2D. 39. Catalysts are used to speed up chemical reactions. Which of the following statements is TRUE regardingcatalysts?A. Heterogenous catalysts are generally more effective than homogenous catalysts.B. Catalysts do not change the mechanism of a reaction; they lower the activation energy of the reaction.C. The effect of a catalyst does not depend on the temperature at which the reaction is taking place.D. Catalysts are more efficient at higher concentrations of the substrate.10. A patient undergoes a series of radiographic imaging procedures in a hospital. During these procedures, thefollowing radiation doses are absorbed by different organs:• The liver absorbs 50 millisieverts (mSv) of radiation.• The brain absorbs 10 centigrays (cGy) of radiation.• The heart absorbs 100 micrograys (µGy) of radiation.Which of the following statements is correct regarding the absorbed radiation doses in these organs?A. The liver received the highest absorbed dose.B. The brain received the highest absorbed dose.C. The heart received the highest absorbed dose.D. The absorbed doses are equal, so no organ received the highest dose.

Simple chemical cells involve two electrodes. Which of the following statements is correct?Both electrodes must be carbonThe electrodes must be two different metalsThe electrodes must be the same metalOne electrode must be carbon2To make a chemical cell, two metal electrodes are dipped in a salt or dilute acid solution and joined by a wire. What causes the electrical current?The flow of electrons from the more reactive metal to the less reactive metalThe formation of metal ions in the salt solutionThe loss of heat to the surroundingsThe flow of electrons from the less reactive metal to the more reactive metal3A zinc/carbon chemical cell (or battery) contains a paste of ammonium chloride. What is the function of this paste?To hold the electrodes in placeTo act as an electrolyteTo act as an electrodeTo hold the wire in place4What is the balanced equation of the overall reaction that takes place in a fuel cell?2H2O → 2H2 + O2H2 + O2 → H2O2H2 + O → 2H2O2H2 + O2 → 2H2O5Which of the following is a disadvantage of using hydrogen as a fuel?Fuel cells do not require rechargingFuel cells can be a range of sizesThe only waste product is waterHydrogen gas is highly flammable6Which of the following statements about hydrogen-oxygen fuel cells is not true?The only waste product is waterElectrical energy is produced from the oxidation of hydrogenHydrogen must be supplied constantlyAn acidic electrolyte is required 5/6 11-Apr-24 12:36

Describe what a chemical reaction is, in terms of the substances involved and the atoms that make them up.