WorksheetsFoundations Chemistry Midterm Review 2021
Total questions: 76
Worksheet time: 45mins
Cannot be decomposed into two or more substances
compound
element
homogeneous mixture
heterogenous mixture
Two or more elements chemically combined in a fixed proportion
compound
element
homogeneous mixture
heterogenous mixture
Evenly distributed, can be separated physically
compound
element
homogeneous mixture
heterogenous mixture
Which particle diagram represents a mixture of two elements?
Which particle diagram represents a diatomic element?
Which particle diagram represents a compound in the gaseous state?
Which process represents a chemical change?
Boiling
Melting
Combusting
Freezing
Which number has the least number of sig figs?
0.0010
10.40
4000
404
How many moles of neon is present in 40.0 g of neon?
800 moles
2.00 moles
0.50 moles
6.022 x 1023 moles
How many grams of neon is present in 2.5 moles of neon?
0.125 grams
8.0 grams
50. grams
6.022 x 1023 grams
The molar mass is the same as the
gram formula mass
coefficients
atomic mass
mass number
The molar mass of Mg3(PO4)2 is
167 g/mol
231 g/mol
262 g/mol
334 g/mol
Electrons have what charge?
Positive
Negative
Neutral
Protons have what charge?
Positive
Negative
Neutral
Neutrons have what charge?
Positive
Negative
Neutral
Protons are located
in orbitals
outside the nucleus
inside the nucleus
(check all of the answers that apply!) Electrons are located
in orbitals
outside the nucleus
inside the nucleus
Gold foil observation: most of the alpha particles passed through the gold foil. Conclusion:
The atom is mostly empty space
The atom has a dense, positive nucleus
The atom contains electrons and protons
The alpha particles were trapped
Gold foil observation: some of the alpha particles deflected away from the gold foil. Conclusion:
The atom is mostly empty space
The atom has a dense, positive nucleus
The atom contains electrons and protons
The alpha particles were trapped
The atomic mass of an element is the weighted average of the atomic masses of
the least abundant isotopes of the element
the naturally occurring isotopes of the
element
the artificially produced isotopes of the
element
the natural and artificial isotopes of the
element
The table gives the atomic mass and the abundance of the two naturally occurring isotopes of bromine. Which numerical setup can be used to calculate the atomic mass of the element bromine?
(78.92 u)(50.69) + (80.92 u)(49.31)
(78.92 u)(49.31) + (80.92 u)(50.69)
(78.92 u)(0.5069) + (80.92 u)(0.4931)
(78.92 u)(0.4931) + (80.92 u)(0.5069)
Metal atoms
lose electrons
gain electrons
Nonmetal atoms
lose electrons
gain electrons
Nonmetal atoms
form positive ions
form negative ions
Metal atoms
form positive ions
form negative ions
What state of matter uniformly fills the container?
(g)
(l)
(s)
(aq)
What state of matter is arranged in a crystalline structure?
(g)
(l)
(s)
(aq)
Which elements are present in this mixture?
D and A
X and A
D and Z
X and Z
Which Lewis electron-dot diagram represents the bonding in potassium iodide?
(1)
(2)
(3)
(4)
Which Lewis electron-dot diagram represents a fluoride ion?
Ionic radius is smaller than atomic radius for
metals
nonmetals
Ionic radius is larger than atomic radius for
metals
nonmetals
Which element's ionic radius is larger than its atomic radius?
Argon
Sodium
Potassium
Nitrogen
Which element's ionic radius is smaller than its atomic radius?
Helium
Magnesium
Sulfur
Bromine
Ionization energy is
the size of an atom
the size of an ion
the ability to attract electrons
the energy required to remove an electron
Electronegativity is
the size of an atom
the size of an ion
the ability to attract electrons
the energy required to remove an electron
Electronegativity, ionization energy and atomic radius can all be found on
the periodic table
Table S
Table E
Table T
The trend in ionization energy is...
decreases across a period, decreases down a group
decreases across a period, increases down a group
increases across a period, decreases down a group
increases across a period, increases down a group
The trend in electronegativity is...
decreases across a period, decreases down a group
decreases across a period, increases down a group
increases across a period, decreases down a group
increases across a period, increases down a group
The trend in atomic radius is...
decreases across a period, decreases down a group
decreases across a period, increases down a group
increases across a period, decreases down a group
increases across a period, increases down a group
For a compound to contain ionic and covalent bonds, it must contain
a metal only
nonmetals only
a polyatomic ion
Which compound contains both ionic and covalent bonds?
KBr
CH4
NH3
NH4NO3
An element with the electron configuration 2-8-1 is a
metal
nonmetal
An element with the electron configuration 2-8-6 is a
metal
nonmetal
Ionic bonds are formed between
metals and nonmetals
nonmetals only
metals only
Covalent bonds are formed between
metals and nonmetals
nonmetals only
metals only
For an atom to go into the excited state, the electron
gains energy and moves closer to the nucleus
gains energy and moves away from the nucleus
loses energy and moves closer to the nucleus
loses energy and moves away from the nucleus
Which electron configuration represents an atom of magnesium in an excited state?
2-8
2-8-8
2-8-2-1
2-8-1-1
How do you determine the number of bonds an element will form?
It's the same as the number of valence electrons
# bonds = 8 + VE
# bonds = 8 - VE
# bonds = 8/VE
The bromine atoms in Br2 share a total of
1 electron
2 electrons
4 electrons
6 electrons
One bond is equal to
one electron
two electrons
one protons
two protons
Metalloids are found
on the left side of the periodic table
along the staircase
on the right side of the periodic table
Metals are found
on the left side of the periodic table
along the staircase
on the right side of the periodic table
Nonmetals are found
on the left side of the periodic table
along the staircase
on the right side of the periodic table
In order to be an isotope, atoms must have
the same number of protons and a different number of neutrons
the same number of neutrons and a different number of protons
the same number of protons and a different number of electrons
the same number of neutrons and a different number of electrons
If a molecule is polar, it must
symmetrical
asymmetrical
If a molecule is nonpolar, it must
symmetrical
asymmetrical
Distillation is separation based on
boiling point
density
polarity
particle size
Filtration is separation based on
boiling point
density
polarity
particle size
Metallic bonds are formed between
metals and nonmetals
nonmetals only
metals only
What is the strongest type of intermolecular force that is found in molecules with H bonded to F, O or N?
London Dispersion Forces
Dipole-Dipole
Hydrogen Bonding
The stronger the IMF, the
higher the boiling point
lower the boiling point
What formula represents the simplest ratio of each element?
Molecular formula
Empirical formula
Gram formula mass
Molar mass
What type of chemical reaction involves multiple reactants forming a single product?
Synthesis
Decomposition
Single Replacement
Double replacement
Combustion
What type of chemical reaction involves a single reactant forming multiple products?
Synthesis
Decomposition
Single Replacement
Double replacement
Combustion
What type of chemical reaction involves an element switching places with an ion in a compound?
Synthesis
Decomposition
Single Replacement
Double replacement
Combustion
What type of chemical reaction involves an ion in a compound switching places with an ion in another compound?
Synthesis
Decomposition
Single Replacement
Double replacement
Combustion
What type of chemical reaction involves oxygen as a reactant with carbon dioxide and water as products?
Synthesis
Decomposition
Single Replacement
Double replacement
Combustion
How is the bright line spectrum produced?
Electrons move from the excited state to the ground state releasing energy as light.
Electrons move from the ground state to the excited state releasing energy as light.
Electrons move from the excited state to the ground state absorbing energy.
Electrons move from the ground state to the excited state absorbing energy.
Which number is higher?
-111
-68
For a bond to be more polar, the elements in the bond must have a
greater difference in electronegativity
smaller difference in electronegativity
the same electronegativity
How do we find a difference in electronegativity for a bond?
Subtract the EN of one element by the other
Add the EN of one element to the other
Multiply the EN of one element by the other
Divide the EN of one element by the other
In order for something to be a chemical change,
a new substance must be formed
a state of matter must occur
the properties must remain the same
no bonds are broken or formed
Endothermic means
energy is released, energy is a reactant
energy is released, energy is a product
energy is absorbed, energy is a reactant
energy is absorbed, energy is a produced
What is the purpose of heating the hydrate to constant mass?
To add in water
To remove all of water
To find the mass of the hydrate
To break the crucible
Ionic compounds conduct electricity when aqueous due to...
mobile ions
the crystal lattice
