January 2019 Chemistry Regents Questions 1-10 Question Preview (ID: 59732)


Use Your Knowledge Of Chemistry To Answer All Questions In The Data Set. You Will Need Your Chemistry Reference Tables And A Calculator To Answer Some Of The Questions. Good Luck. TEACHERS: click here for quick copy question ID numbers.

The results of the gold foil experiment led to the conclusion that an atom is
a) mostly empty space and has a small, negatively charged nucleus
b) mostly empty space and has a small, positively charged nucleus
c) a hard sphere and has a large, negatively charged nucleus
d) a hard sphere and has a large, positively charged nucleus

Atoms are neutral because the number of
a) protons equals the number of neutrons
b) protons equals the number of electrons
c) neutrons is greater than the number of protons
d) neutrons is greater than the number of electrons

In the ground state, valence electrons of a krypton atom are found in
a) the first shell
b) the outermost shell
c) both the nucleus and the first shell
d) both the first shell and the outermost shell

According to the wave-mechanical model of the atom, electrons are located in
a) orbitals
b) circular paths
c) a small, dense nucleus
d) a hard, indivisible sphere

Which electron configuration represents the electrons in an atom of sodium in the ground state at STP?
a) 2-8-1
b) 2-7-2
c) 2-8-6
d) 2-7-7

The elements on the Periodic Table of the Elements are arranged in order of increasing
a) atomic number
b) mass number
c) number of neutrons
d) number of valence electrons

Which element is malleable at STP?
a) chlorine
b) copper
c) helium
d) sulfur

At 298 K and 1 atm, which noble gas has the lowest density?
a) Ne
b) Kr
c) Xe
d) Rn

Which two terms represent types of chemical formulas?
a) empirical and molecular
b) polar and nonpolar
c) synthesis and decomposition
d) saturated and concentrated

Which quantities are conserved in all chemical reactions?
a) charge, pressure, and energy
b) charge, mass, and energy
c) volume, pressure, and energy
d) volume, mass, and pressure

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