75 Old and Hard Regents Questions

Below are the 75 most missed questions from recent regents exams

1. In the wave-mechanical model, an orbital is a region of space in an atom where there is
(1) a high probability of finding an electron
(2) a high probability of finding a neutron
(3) a circular path in which electrons are found
(4) a circular path in which neutrons are found

2. What is the charge of the nucleus in an atom of oxygen-17?
(1) 0        (2) –2        (3) +8      (4) +17

3. Helium is most likely to behave as an ideal gas when it is under
(1) high pressure + high temperature
(2) high pressure + low temperature
(3) low pressure + high temperature
(4) low pressure + low temperature

4. At STP, the element oxygen can exist as either O2 or O3 gas molecules. These two forms of the element have
(1) the same chemical and physical properties
(2) the same chemical properties and different physical properties
(3) different chemical properties and the same physical properties
(4) different chemical and physical properties

5. In a nuclear fusion reaction, the mass of the products is
(1) less than the mass of the reactants because some of the
mass has been converted to energy.
(2) less than the mass of the reactants because some of the
energy has been converted to mass.
(3) more than the mass of the reactants because some of the
mass has been converted to energy.
(4) more than the mass of the reactants because some of the
energy has been converted to mass.

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