Questions

Explanations

Each interval on the axis labeled "Potential Energy (kJ/mol)'" represents 10. kilo joules per mole. What is the activation energy or the forward reaction?

(3) 40. kJ/mol

(4) 60. kJ/mol

4 boxes times 10kj/mol

42 Which condensed structural formula  represents an unsaturated compound?

(1) CH₃CHCHCH₃   (3) CH₃CH₃

(2) CH₃CH₂CH₃      (4) CH₄

unsaturated is not all single bonds, alkenes have a double

43 Which element reacts spontaneously with 1.0M HCl (aq) at room temperature?

(2) gold        (4) zinc

(2) 2.0 mol     (4)  6.0mol

so 2 x 3.0 moles is 6 moles of electrons

45 What is the amount of heat energy released when 50.0 grams of water is cooled from 20.0°C to 10.0°C?

(1) 5.00 X 10² J

(2) 2.09 X I0³ J

(3) 1.67 X 10⁵ J

(4) 1.13 X 10⁶ J

Q=50.0g x 4.18J/gC x (10-20)

Q=-2090J  (negative is exothermic (energy is released))

46 What occurs at one of the electrodes in both an electrolytic cell and a voltaic c31?

(1) Oxidation occurs  as electrons arc gained at the cathode.

(2) Oxidation occurs as electrons  are lost at the anode.

(3) Reduction occurs as electrons are gained at the anode.

(4) Reduction occurs as electrons are lost at the cathode.

reduction at the cathode, oxidation at the anode

LEO GER

Lose electrons oxidation, gain electrons reduction

47 Given the balanced equation representing a reaction:

H₂O + HCl ==> H₃O⁺ + Cl^-

According to one acid-base theory, the H₂O molecule

(1)  accepts H+ ions     (3) donate H+ ions

(2) accepts OH- ions (4) donates OH- ions

(2) a beta particle     (4) a positron

49 Which balanced equation represents nuclear fusion?

50 Which reaction releases the greatest amount of energy per kilogram of reactants?

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