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WorksheetsPhysical Science Mid-Term Test (Units 1 - 3)
Total questions: 30
Worksheet time: 15mins
The atomic number of an atom is defined as which of the following?
mass in amu
number of electrons
mass in grams
number of protons
Using a periodic table, what is the average atomic mass of cobalt (Co)?
40.08 amu
52.00 amu
58.93 amu
65.55 amu
What is the charge of an electron?
-2
-1
0
+1
Arsenic is a metalloid. Which statement best describes arsenic?
Arsenic is similar to a nonmetal because it is a gas at room temperature and similar to a metal because it is not malleable.
Arsenic is similar to a nonmetal because it is brittle and similar to a metal because it conducts heat and electricity well.
Arsenic is only similar to a metal because it is not ductile and is a gas at room temperature.
Arsenic is only similar to a nonmetal because it is a good conductor and is reflective.
Due to the number of valence electrons, which type of atom would a Group 1 element bond with in a 1:1 ratio?
argon
oxygen
carbon
fluorine
What is the most important factor in determining how an atom will bond?
the number of protons the atom has
the number of neutrons the atom has
the number of isotopes of the atom that exist
the number of electrons in the atom's outermost energy level
The chemical properties of calcium are most similar to the chemical properties of
Ar
K
Sc
Mg
Which element has chemical properties that are MOST similar to those of calcium?
Ar
K
Sc
Mg
Which sequence of atomic numbers represents elements that have similar chemical properties?
3, 12, 21, 40
4, 20, 38, 88
9, 16, 33, 50
19, 23, 30, 36
What is the overall charge of the compound sodium chloride?
+1
+2
0
-1
What leads to the formation of a covalent bond?
the transfer of electrons
the sharing of an electron pair
the transfer of protons
the sharing of a proton pair
In a chemical equation, what indicates the number of molecules of a given substance?
subscript
coefficient
superscript
reaction number
Which best describes a stable binary ionic compound?
two ions with the same charges and a net charge of negative one (1)
two ions with opposite charges and a net charge of positive one (+1)
two ions with the same charges and a net charge of zero (0)
two ions with opposite charges and a net charge of zero (0)
What is the chemical formula for the compound formed when aluminum ions (A1³+) and chloride ions (Cl-) unite?
AICI
Al₂Cl
AICI₂
AlCl3
What does a chemical formula show?
the number and type of each atom in a compound
the number of each atom in a compound, only
the chemical properties of atoms in a compound
the mass of atoms in a compound
What is the chemical name for NO2?
nitrogen oxide
nitrogen dioxide
nitrogen trioxide
nitrogen monoxide
What is the chemical formula for dinitrogen monoxide?
NO
NO₂
2NO₂
N₂O
In a chemical reaction, how does the total mass of the products compare to the total mass of the reactants?
They are always equal.
The reactants are always smaller.
The reactants are always larger.
They are never equal.
Which of the following is a balanced equation?
Na₂S + 2KCI → 2NaCl + K₂S
LICI + 2H₂O → 2HCl + Li₂O
2KBr + 2CaO → K₂O + CaBr2
NaCl + H₂O → NaO + 2HCI
Which type of chemical bond is formed by the electrostatic force between a positive ion and a negative ion?
cooperative
covalent
ionic
metallic
What is the sum of the charges in a compound?
0
+1
+2
-1
Hydrofluoric acid is an extremely strong acid with a pH of 2.1. What is the chemical formula for the reaction between hydrogen and fluorine to make the hydrofluoric acid?
HF
H₂F
HF2
H₂F3
What type of reaction is shown in the equation below? 2H₂0 > 2H₂ + O2
synthesis
decomposition
single replacement
double replacement
Does the equation 2H₂O2 → 2H₂O + O2 follow the conservation of mass?
Yes, because the mass of the reactants is greater than the mass of the products.
No, because the mass of the reactants is greater than the mass of the products.
No, because the coefficient of the reactant is less than the coefficient sum of the products.
Yes, because each atom that is in the reactants is found in the products.
Which of the following is a balanced equation?
2NaBr + Cl₂ → 2NaCl + Br2
NaBr + Cl₂ → NaCl + Br2
NaBr + Cl₂ → NaCl + Br
NaBr + Cl₂ → NaCl + Br3
Which type of chemical bond requires the transfer of electrons between atoms?
ionic
metallic
covalent
cooperative
What is the suffix for all binary ionic compounds of representative elements?
-ate
-ide
-OUS
-ane
Which is the correct way to write the formula for the compound diphosphorus pentoxide?
P204
PO4
P50
P205
In a chemical formula, which of the following indicates how many of each atom or ion is present?
the atomic number
the subscript
the charge
the element symbol
In a chemical reaction, how does the total mass of the products compare to the total mass of the reactants?
They are always equal
The reactants are always smaller
The reactants are always larger
They are never equal
