January 2003 Regents #21-30
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Other Regents Exams
|21 When a mixture of water,
sand, and salt is filtered, what passes through
the filter paper?
|3||the salt will dissolve in the water and pass through the filter paper|
|22 A hydrate is a compound
that includes water molecules within its
crystal structure. During an experiment to determine the percent by
mass of water in a hydrated crystal, a student found the mass of the
hydrated crystal to be 4.10 grams. After heating to constant mass, the
mass was 3.70 grams. What is the percent by mass of water in this crystal?
|23 Which of these 1 M
solutions will have the highest pH?
pH is a base
NaOH (OH-) is a base
24 Which physical property makes it
possible to separate the components
of crude oil by means of distillation?
|4||distillation use boiling point differences|
|25 In saturated
hydrocarbons, carbon atoms are bonded to each other by
|1||saturated hydrocarbons-all single bonds-alkanes|
|26 Which formula correctly
represents the product of an addition reaction
between ethene and chlorine?
|3||C2H4 + Cl2 -->C2 H4 Cl2|
|27 When a neutral atom
undergoes oxidation, the atomís oxidation state
|4||ox # increase-loses electrons|
|2||2H+ --> H2o|
|1||2 reactants and the isotopic notations|
|4||acid base salt --> aqueous|
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