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WorksheetsChemistry Grade Recovery Assignment
Total questions: 60
Worksheet time: 30mins
An atom’s atomic mass tells you the number of _______ in an atom of the element.
protons
neutrons
protons and neutrons
photons
The elements are place in the periodic table by ____.
Decreasing atomic mass
Decreasing atomic number
Increasing atomic mass
Increasing atomic number
Where are the valence electrons located on an atom?
On the closest energy level to the nucleus
On the middle energy level
On the farthest energy level from the nucleus
On the vertical columns of the Periodic Table
The positively charged particle in the nucleus of an atom is the
electron
proton
neutron
magnetron
Most of the energy of the atom is found in the
nucleus
Energy level closest to the nucleus
Energy level furthest from the nucleus
Nuclear force bonding
How many energy levels are occupied in an atom of oxygen?
2
3
4
8
How many electrons can the second energy level hold?
2
8
18
32
Neutrons and protons are found in the _____ of the atom.
nucleus
energy levels
isotope
atom's ion
Each molecule of hydrochloric acid, HCl, contains one atom of hydrogen and:
one atom of chlorine
one atom of oxygen
two atoms of chlorine
two atoms of oxygen
How many atoms of hydrogen are in sugar (C6H12O6)?
1
3
6
12
An ionic bond is a bond that forms between
ions with opposite charges
atoms with neutral charges
one atoms nucleus and another atom’s electrons
the electrons of two different atoms
Covalent bonds are formed between two or more
ions
metal atoms
non-metal atoms
compounds
In a metallic bond, the nucleus of one atom is attracted by a nearby atom’s
nucleus
negative ion
energy structure
electrons
The type of bond where atoms share electrons is
covalent
metallic
ionic
polyatomic
The anion formed from an oxygen atom is called a (an)
oxygen ion
oxide ion
carbon dioxide
nitrous oxide
The name dinitrogen tetroxide tells you that this compound contains
two nitrogen atoms and two oxygen atoms
four nitrogen atoms and two oxygen atoms
two nitrogen atoms and four oxygen atoms
four nitrogen atoms and four oxygen atoms
The compound CaCl2 would be classified as
ionic
covalent
polyatomic
metallic
A carbon atom can bond to four other atoms because it has
four different cations
four valence cations
two inner energy levels
no protons in its nucleus
A chromium ion (Cr3+) combines with an oxygen ion (O2-) to form an ionic compound. Which formula represents an ionic compound formed by these two ions?
CrO
CrO2
Cr2O3
Cr3O2
Two elements, X and Z react together to form an ionic substance, XZ. In this reaction, X loses an electron, and Z gains that electron. Which classification below most likely identifies the two elements?
X = metal; Z = nonmetal
X = non-metal; Z = metal
X = transition metal; Z = metalloid
X = metal; Z = metal
The covalent bond between a hydrogen atom and the oxygen atom in water is formed when
hydrogen gains an electron from oxygen
hydrogen and oxygen share an electron pair
hydrogen and oxygen both lose electrons from their outer shells
oxygen gains an electron from hydrogen
How many electrons are shared in a single covalent bond?
1
6
2
4
If magnesium ions have a 2+ charge and oxygen ions have a 2- charge, the compound magnesium oxide is:
Mg4O2
Mg2O2
MgO3
Mg2O4
What elements tend to form ionic compounds?
any two elements of the same phase
elements found in the upper right hand side of the periodic table
metallic elements
elements found on opposite sides of the periodic table
If sodium ions (Na+) have a 1+ charge and sulfate ions (SO42-) have a 2- charge, the compound sodium sulfate is?
NaSO4
Na2(SO4)2
NaSO8
Na2(SO4)
Aluminum oxide, Al2O3 is produce by combining Al3+ and O2- particles. What type of compound has formed?
covalent
ionic
metallic
molecular
Which of these best describes the difference between the formulas for nitrogen monoxide and nitrogen dioxide?
nitrogen monoxide has one more atom of nitrogen
nitrogen dioxide has one fewer atom of oxygen
nitrogen monoxide has one fewer atom of oxygen
nitrogen dioxide has one more atom of nitrogen
How would you name this PbO2 ionic compound?
lead (II) oxide
lead (III) oxide
lead (I) oxide
lead (IV) oxide
All alcohols contain
carbon, hydrogen and oxygen
carbon, hydrogen and nitrous oxide
carbon, hydrogen and oxide
carbon, hydrogen and oxymoron
Describe the electron movement in ionic bonds.
The cations gain the electrons and the anions lose electrons
The cations give up their electrons, and the anions gain the electrons
Their electrons are shared, like NaCl, (salt); MgBr2, (magnesium bromide)
Who cares
Describe the electron movement in Covalent bonds.
The cations gain the electrons and the anions lose electrons
The cations give up their electrons, and the anions gain the electrons
Their electrons are shared, like H2O - Water; CO – Carbon monoxide; CO2 – Carbon dioxide; C6H12O6 – Glucose.
The atoms give up and take in electrons on their valence shells, thus making them “happy” stable compounds
Anions are always ______________.
Metals and positively charged.
Metals and negatively charged.
Non-metals and negatively charged.
Non-metals and positively charged.
What is an atoms oxidation number?
It is the positive or negative charge an atom becomes after receiving or giving up electrons during a covalent bond.
It is the positive or negative charge an atom becomes after receiving or giving up electrons during an ionic bond.
It is the charge the Oxygen atom has in any chemical reaction.
It is the charge the Oxygen atom has in any covalent bond reaction.
What is the oxidation number of Copper (its charge after an ionic bond)?
+1
(1)
(IV)
unknown since it is a transition metal.
The atomic mass of Xenon is 132 AMU.
True
False
How many electrons in an atom of Xenon?
54
131.293
77
185.293
How many protons in an atom of Xenon?
54
131.293
77
185.293
How many neutrons in an atom of Xenon?
54
131.293
77
185.293
What elements are present in CaCO3?
a calcium and a cobalt
calcium and chlorine
calcium, carbon, and oxygen
carbon, chlorine, and oxygen
The covalent bond between a hydrogen atom and the oxygen atom in water is formed when
hydrogen gives an electron to oxygen
hydrogen and oxygen share an electron pair
hydrogen and oxygen both lose electrons from their outer shells
hydrogen gains an electron from oxygen
Which of the following is not a characteristic of an acid?
sour taste
pH below 7
sharp smell
pH above 7
Which of the following is not a characteristic of a base?
bitter taste
pH below 7
slippery
pH above 7
What are the two parts of every chemical reaction?
reactants and products
reactants and results
ingredients and products
ingredients and results
What type of reaction is the following: AgNO3 + NaCl --> NaNO3 + AgCl
synthesis
combustion
double replacement
neutralization
A reaction with vinegar and baking soda is a what type of reaction?
endothermic
exothermic
combustion
nuclear
What type of reaction is the following: 2H2 + O2 --> 2H2O
synthesis
combustion
single replacement
neutralization
Which one of the following is a balanced chemical reaction?
2C8H18 + 25O2 --> 16CO2 + 18H2O
C8H18 + O2 --> CO2 + H2O
2CH + 25O --> 16CO + 18HO
2C8H18 + 5O2 --> 16CO2 + 8H2O
Which one of the following best describes a neutralization reaction?
Two elements combine to make a compound
A compound breaks down to form two elements
An acid and a base react to form salt, H2O, and CO2
Can only contain C, H, and O and reacts to produce CO2 and H2O
Which one of the following best describes a combustion reaction?
Two elements combine to make a compound
A compound breaks down to form two elements
An acid and a base react to form salt, H2O, and CO2
Can only contain C, H, and O and reacts to produce CO2 and H2O
Which one of the following is a balanced chemical reaction?
Al(HCO3) + AlPO4 --> Al2(OH)3 + H3PO4
Al(HCO3) + 2AlPO4 --> Al2(OH)3 + H3PO4
2Al(HCO3) + AlPO4 --> Al2(OH)3 + H3PO4
Al(HCO3) + AlPO4 --> 3Al2(OH)3 + H3PO4
Which one of the follow best describes a synthesis reaction?
Two elements combine to make a compound
A compound breaks down to form two elements
An acid and a base react to form a salt, H2O, and CO2
Can only contain C, H, and O and reacts to produce CO2 and H2O
Which one of the following is a balanced chemical reaction?
2N2O5 --> 2N2 + 5O2
3N2O5 --> 2N2 + 5O2
N2O5 --> N2 + O2
2N2O5 --> 2N2 + O2
Which one of the following is NOT a chemical reaction?
single replacement
neutralization
combustion
solubility
Which one of the following reactions may occur spontaneously?
exothermic
endothermic
both of them
none of the above
What type of reaction is the following: Zn + H2SO4 --> H2 + ZnSO4
synthesis
single replacement
single replacement
neutralization
Which one of the following best describes a decomposition reaction?
Two elements combine to make a compound
A compound breaks down to form two elements
An acid and a base react to form salt, H2O, and CO2
Can only contain C, H, and O and reacts to produce CO2 and H2O
If sodium ions (Na+) have a 1+ charge and sulfate ions (SO42-) have a 2- charge, the compound sodium sulfate is?
NaSO4
Na2(SO4)2
NaSO8
Na2(SO4)
If magnesium ions have a 2+ charge and oxygen ions have a 2- charge, the compound magnesium oxide is:
Mg4O2
Mg2O2
MgO3
Mg2O4
How many moles are in 22 grams of argon?
0.55 mol
878.9 mol
396 mol
1.22 mol
How many grams are in 88.1 moles of magnesium?
3.62 grams
2141 grams
7.34 grams
1057 grams
