Chemistry 21 June 2016 Questions Answer keys
The University Of The State Of New York
Regents High School Examination
Tuesday, June 21, 2016 — 9:15 a.m. to 12:15 p.m., only
1. Which statement describes the charge of an electron and the charge of a proton?
- (1) An electron and a proton both have a charge of +1.
- (2) An electron and a proton both have a charge of -1.
- (3) An electron has a charge of 1, and a proton has a charge of -1.
- (4) An electron has a charge of 1, and a proton has a charge of +1.
2. Which subatomic particles are found in the nucleus of an atom of beryllium?
- (1) electrons and protons
- (2) electrons and positrons
- (3) neutrons and protons
- (4) neutrons and electrons
3. The elements in Period 4 on the Periodic Table are arranged in order of increasing
- (1) atomic radius
- (2) atomic number
- (3) number of valence electrons
- (4) number of occupied shells of electrons
4. Which phrase describes two forms of solid carbon, diamond and graphite, at STP?
- (1) the same crystal structure and the same properties
- (2) the same crystal structure and different properties
- (3) different crystal structures and the same properties
- (4) different crystal structures and different properties
5. Which element has six valence electrons in each of its atoms in the ground state?
- (1) Se
- (2) As
- (3) Kr
- (4) Ga
6. What is the chemical name for H2SO3(aq)?
- (1) sulfuric acid
- (2) sulfurous acid
- (3) hydrosulfuric acid
- (4) hydrosulfurous acid
7. Which substance is most soluble in water?
- (1) (NH4)3PO4
- (2) Cu(OH)2
- (3) Ag2SO4
- (4) CaCO3
8. Which type of bonding is present in a sample of an element that is malleable?
- (1) ionic
- (2) metallic
- (3) nonpolar covalent
- (4) polar covalent
9. Which atom has the greatest attraction for the electrons in a chemical bond?
- (1) hydrogen
- (2) oxygen
- (3) silicon
- (4) sulfur
10. Which type of reaction involves the transfer of electrons?
- (1) alpha decay
- (2) double replacement
- (3) neutralization
- (4) oxidation-reduction
11. A 10.0-gram sample of nitrogen is at STP. Which property will increase when the sample is cooled to 72 K at standard pressure?
- (1) mass
- (2) volume
- (3) density
- (4) temperature
12. Which element is a gas at STP?
- (1) sulfur
- (2) xenon
- (3) potassium
- (4) phosphorus
13. A 5.0-gram sample of Fe(s) is to be placed in 100. milliliters of HCl(aq). Which changes will result in the fastest rate of reaction?
- (1) increasing the surface area of Fe(s) and increasing the concentration of HCl(aq)
- (2) increasing the surface area of Fe(s) and decreasing the concentration of HCl(aq)
- (3) decreasing the surface area of Fe(s) and increasing the concentration of HCl(aq)
- (4) decreasing the surface area of Fe(s) and decreasing the concentration of HCl(aq)
14. Which process is commonly used to separate a mixture of ethanol and water?
- (1) distillation
- (2) ionization
- (3) filtration
- (4) titration
15. A sample of hydrogen gas will behave most like an ideal gas under the conditions of
- (1) low pressure and low temperature
- (2) low pressure and high temperature
- (3) high pressure and low temperature
- (4) high pressure and high temperature
16. The collision theory states that a reaction is most likely to occur when the reactant particles collide with the proper
- (1) formula masses
- (2) molecular masses
- (3) density and volume
- (4) energy and orientation
17. At STP, which sample contains the same number of molecules as 3.0 liters of H2(g)?
- (1) 1.5 L of NH3(g)
- (2) 2.0 L of CO2(g)
- (3) 3.0 L of CH4(g)
- (4) 6.0 L of N2(g)
18. The addition of a catalyst to a chemical reaction provides an alternate pathway that
- (1) increases the potential energy of reactants
- (2) decreases the potential energy of reactants
- (3) increases the activation energy
- (4) decreases the activation energy
19. A sample of water is boiling as heat is added at a constant rate. Which statement describes the potential energy and the average kinetic energy of the water molecules in this sample?
- (1) The potential energy decreases and the average kinetic energy remains the same.
- (2) The potential energy decreases and the average kinetic energy increases.
- (3) The potential energy increases and the average kinetic energy remains the same.
- (4) The potential energy increases and the average kinetic energy increases.
20. Entropy is a measure of the
- (1) acidity of a sample
- (2) disorder of a system
- (3) concentration of a solution
- (4) chemical activity of an element
21. Which element has atoms that can bond with each other to form ring, chain, and network structures?
- (1) aluminum
- (2) calcium
- (3) carbon
- (4) argon
22. What is the number of electrons shared in the multiple carbon-carbon bond in one molecule of 1-pentyne?
- (1) 6
- (2) 2
- (3) 3
- (4) 8
23. Butanal, butanone, and diethyl ether have different properties because the molecules of each compound differ in their
- (1) numbers of carbon atoms
- (2) numbers of oxygen atoms
- (3) types of functional groups
- (4) types of radioactive isotopes
24. What occurs when a magnesium atom becomes a magnesium ion?
- (1) Electrons are gained and the oxidation number increases.
- (2) Electrons are gained and the oxidation number decreases.
- (3) Electrons are lost and the oxidation number increases.
- (4) Electrons are lost and the oxidation number decreases.
25. Energy is required to produce a chemical change during
- (1) chromatography
- (2) electrolysis
- (3) boiling
- (4) melting
26. The reaction of an Arrhenius acid with an Arrhenius base produces water and
- (1) a salt
- (2) an ester
- (3) an aldehyde
- (4) a halocarbon
27. One acid-base theory defines an acid as an
- (1) H– acceptor
- (2) H– donor
- (3) H+ acceptor
- (4) H+ donor
28. Which phrase describes the decay modes and the half-lives of K-37 and K-42?
- (1) the same decay mode but different half-lives
- (2) the same decay mode and the same half-life
- (3) different decay modes and different half-lives
- (4) different decay modes but the same half-life
29. Which particle has a mass that is approximately equal to the mass of a proton?
- (1) an alpha particle
- (2) a beta particle
- (3) a neutron
- (4) a positron
30. Which change occurs during a nuclear fission reaction?
- (1) Covalent bonds are converted to ionic bonds.
- (2) Isotopes are converted to isomers.
- (3) Temperature is converted to mass.
- (4) Matter is converted to energy.
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