June 2016 Chemistry Regents #41-45
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Questions | Answer | Links | Explanations |
| 41 Given the balanced equation representing a reaction: 2H2O + energy ==> 2H2 + O2 Which statement describes the change in energy and bonding from the reactant? (1) Energy is absorbed as bonds in H2O are formed. (2) Energy is absorbed as bonds in H2O are broken. (3) Energy is released as bonds in H2O are formed. (4) Energy released as bonds in H2O are broken. | 2 | Energy is absorbed as bonds in H2O are broken | |
42 At standard pressure, what is the temperature at which a saturated solution of NH4Cl has a concentration of 60.g/100. g H2O? (1) 66oC (3) 22oC (2) 57 oC (4) 17oC | 1 | Table G find the temperature that corresponds to 60g of NH4Cl since it says 100g of water, there is no multiplier | |
43 Which aqueous solution has the highest boiling point at standard pressure? (1) 1.0 M KC1(aq) (3) 2.0 M KCl(aq) (2) 1.0 M CaC12(aq) (4) 2.0 M CaC12(aq) | 4 | vant Hoff factor highest BP has the most particles...ions CaCl2 forms 3 ==> Ca2+ and 2Cl- | |
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44 Given the equation representing a system at equilibrium: KNO3(s) + energy ==> K+(aq) + NO3-(aq) Which change causes the equilibrium to shift? (1) increasing pressure (2) increasing temperature (3) adding a noble gas (4) adding a catalyst | 2 | increasing the temperature shift the equilibrium to the right | |
45 Which hydrocarbon is saturated? (1) C2H2 (3) C3H8 (2) C3H4 (4) C4H10 | 4 | saturated...all single bonds...alkanes follows CnH2n+2 | |
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