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Physical and Chemical Processes (Grades 11-12)

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Physical and Chemical Processes

Consider the following endothermic reaction:
[math]N_2(g) + O_2(g) rarr 2NO (g) [/math]
[math]DeltaH = +180 (kJ)/(mol[/math]

Which statement correctly defines this endothermic reaction?
  1. Product is less stable than the reactants
  2. Heat is evolved in this reaction
  3. Reaction proceeds spontaneously in the forward direction
  4. Enthalpy of products is less than those of reactants
Which statement correctly defines an exothermic reaction?
  1. A chemical reaction with evolution of heat
  2. A chemical reaction with absorption of heat
  3. A chemical reaction with no change in internal energy
  4. A chemical chemical with no change in temperature
Which chemical equation shows precipitation?
  1. [math]NaCl + AgNO_3 rarr AgCl darr + NaNO_3[/math]
  2. [math]NaOH + HCl rarrNaCl + H_2O[/math]
  3. [math]Fe^(2+) + Ce^(4+ ) hArr Fe^(3+) + Ce^(3+)[/math]
  4. [math]CH_3COOH + NaOH -> CH_3COONa + H_2O[/math]
Which of the following is a type of acid-base reaction?
  1. Neutralization reaction
  2. Synthesis reaction
  3. Decomposition reaction
  4. Redox reaction
Which chemical equation shows an acid-base reaction?
  1. [math]CH_3COOH + NaOH ->CH_3COONa + H_2O[/math]
  2. [math](Cr_2O_7)^(2-) + 14H^+ + 6e^(-) hArr 2Cr^(3+) + 7H_2O[/math][math][/math]
  3. [math]Fe^(2+) + Ce^(4+) hArr Fe^(3+) + Ce^(3+[/math]
  4. [math]Cl^(-) + Ag^(+) rArr AgCl(s)[/math]
Which chemical equation shows a redox reaction?
  1. [math]CH_3COOH + NaOH -> CH_3COONa + H_2O[/math]
  2. [math]Cl^(-) + Ag^(+) ->AgCl darr[/math][math][/math]
  3. [math]5Fe^(2+) + MnO_4^(1-) + 8H_3O^+ rArr6Fe^(3+) + Mn^(2+) + 12H_2O[/math]
  4. [math]HCl + NaOH -> NaCl + H_2O[/math]
In which of the following chemical reactions are the reactants completely converted into products?
  1. [math]2KClO_3(s) -> 2KCl (s) + 3O_2(g) uarr[/math]
  2. [math]N_2(g) + 3H_2(g) hArr 2NH_3(g)[/math]
  3. [math]N_2O_4 (g) hArr 2NO_2(g)[/math]
  4. [math]N_2(g) + O_2(g) hArr 2NO(g)[/math]
Which of the following chemical equations represents a physical change?
  1. [math]H_2O(l) harr H_2O (g)[/math]
  2. [math]N_2(g) + O_2(g) harr 2NO(g)[/math]
  3. [math]CaCO_3(s) harr CaO (s) + CO_2(g)[/math]
  4. [math]C(s) + CO_2(g) harr 2CO(g)[/math]
In exothermic reactions, the enthalpy of the products is less than that of the reactants.
  1. True
  2. False
A hydrocarbon and oxygen gas are typical reactants in a                            reaction.

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