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WorksheetsRegents Chemistry Midterm Review
Total questions: 20
Worksheet time: 20mins
In an atom, an orbital represents
the most probably location of a proton
the most probable location of an electron
the least probably location of a neutron
photons emitted as electrons move to lower energy levels
Which particle has a mass so small, it is considered to be 0 amu?
proton
hydrogen nucleus
neutron
electron
During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms
are gained by the atoms
are lost by the atoms
move to higher energy states within the atoms
move to lower energy states within the atoms
What quantity is the same among atoms of the same element?
mass number
atomic number
number of neutrons
number of nucleons
An atom that has 8 protons and 10 neutrons is an isotope of the element
nitrogen
oxygen
fluorine
neon
Which elements have the most similar chemical properties?
Ge, As, and Sb
Mn, Fe, and Co
S, Se, and Te
P, S, and Cl
In a bond between an atom of hydrogen and an atom of chlorine, the hydrogen atom has a
weaker attraction for electrons
stronger attraction for electrons
smaller number of first-shell atoms
larger number of first-shell atoms
Which atom has the lowest electronegativity?
Nitrogen
Oxygen
Fluorine
Neon
Which temperature is equal to 170 C?
103 K
443 K
-103 K
498 K
Which statement accurately describes particles of an ideal gas, according to the kinetic molecular theory?
The distance between the gas particles is much greater than the size of the particles
As the gas particles collide, the total energy of the system increases
The gas particles have strong intermolecular forces
The gas particles move in a circular motion
What is the overall charge of an ion that has 9 protons, 11 neutrons, and 10 electrons?
+1
-1
+2
-2
Which electron configuration represents the atoms of a bromine atom in the excited state?
2-8-18-7
2-8-18-8
2-8-17-8
2-8-18-7-1
Which formula represents a polar molecule?
Cl2
CH4
HCl
CO2
Which compound has both ionic and covalent bonds?
CH4
CO
CaCl2
MgSO4
When iron is mixed with sulfur, the iron
becomes a covalent compound
retains its magnetic properties
loses its magnetic properties
transfers its magnetic properties to sulfur
As the elements in Group 2 in the periodic table are considered in order of increasing atomic number, there is a general increase in
stability
atomic radius
electronegativity
first ionization energy
How many electron pairs are shared between the atoms in an N2 molecule?
1
2
3
4
How would you classify NaCl?
element
compound
heterogeneous mixture
homogeneous mixture
Which pair of atoms will form ionic bonds?
S and F
Mg and O
F and Cl
H and Ne
Under which conditions does a gas behave least like an ideal gas?
high temperature and low pressure
high temperature and high pressure
low temperature and low pressure
low temperature and high pressure
