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WorksheetsScience 10: Chemistry Unit Exam Review
Total questions: 71
Worksheet time: 1hrs 18mins
How many electrons does potassium K contain?
19
39
20
40
What's a valence electron?
electrons in the second energy level
electrons in the outermost energy level
the atomic number
electrons in the first level
An atom of Carbon has 6 Protons, 6 Neutrons and 6 Electrons. What is the overall charge of a carbon atom?
6
12
18
0
Which group on the Periodic Table is not reactive (inert)?
Group 1
Group 2
Group 17
Group 18
How do you determine the number of valence electrons an element has?
Look at its period
Look at its group
Look at its atomic number
Look at its atomic mass
What will an atom of potassium (K) do to achieve a full valence shell?
Gain 1 electron
Lose 1 electron
Lose 2 electrons
It already has a full valence shell
What is the name of this chemical family?
Noble gases
representative elements
alkali metals
alkali earth metals
The element symbol for iron includes the number 55.845. What is this number called?
atomic number
atomic mass
atomic configuration
atomic element
Why are the elements in Group (18) called Noble gases?
They were discovered by the royal family.
They are more valuable than other gases.
They rarely take part in a reaction.
They are highly reactive.
Which element belongs in the halogen family?
Rn
Ne
Br
Xe
The compound P4S5 is named...
phosphorus sulfide
phosphorus(V) sulfide
phosphorus(IV) sulfide
tetraphosphorus pentasulfide
The chemical formula for dichlorine heptoxide is...
Cl2O7
ClO
Cl2O7-
2Cl7O
The chemical formula for magnesium phosphide is...
Mg2P3
MgP
Mg3P2
Mg2+ P3-
The compound K2CO3 is named...
potassium carbonate
potassium(II) carbonate
potassium carbide trioxide
dipotassium tricarbonate
Ammonium has a charge of +1.
Carbonate has a charge of -2.
The chemical formula for the compound ammonium carbonate is...
NH4(CO3)2
NH4CO3
(NH4)2CO3
(NH)(CO)2
What is the formula for copper(I) sulfate?
CuSO3
CuSO4
Cu2SO3
Cu2SO4
What is the formula for iron(II) carbonate?
Fe2CO3
FeCO3
Fe2CO2
FeCO4
An atom has a full first energy level and 7 electrons in its second level. How many electrons does this atom have?
2
7
9
Need more information
What does the nucleus of an atom contain?
Electrons and neutrons
Protons and neutrons
Neutrinos and positrons
Electrons and megatrons
Consider the Bohr model shown. If you drew a similar Bohr model for sulfur, how many electrons would be in the third energy level?
5
6
7
8
If I gain electrons I become
Positive because I've added to my atom
negative because I've added electrons
same because i'm balanced
equal because now I have electrons
When a nonmetal gains electrons, it becomes this type of ion.
Anion
Cation
When a metal loses electrons, it becomes this type of ion.
anion
cation
What is the ion that has 12 protons and 10 electrons?
Mg+2
Mg-2
Ne+2
Ne-2
Isotopes of an element have a different number of...
Protons
Neutrons
Electrons
If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:
16
32
48
64
Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two neutrons.
true
false
Which isotope of fluorine has 9 protons and 9 neutrons?
Fluorine-18
Fluorine-9
Fluorine-16
Fluorine-18.998
Formed when a non-metal shares electrons with another non-metal.
ionic compound
molecular compound
Formed when positively charged metal ions attract negatively charged non-metal ions.
ionic compounds
molecular compounds
MgO is a(n)
ionic compound
molecular compound
CH4 is a(n)
ionic compound
molecular compound
Which of the following elements are diatomic?
Boron
Carbon
Nitrogen
Oxygen
Fluorine
A multivalent metal is one that
Forms multiple ion charges
Forms +2 ions
Will form positive or negative ions
Can participate in ionic or covalent bonds
What type of reaction involves 2 substances combining to form 1 new compound?
Decomposition Reaction
Single Displacement Reaction
Double Displacement Reaction
Synthesis / formation / composition Reaction
What type of reaction involves the breaking down of a substance into simpler substances?
Single Displacement Reaction
Double Displacement Reaction
Synthesis Reaction
Decomposition Reaction
Identify this type of reaction,
Cl2 + 2KI --> I2 + 2KCl
Synthesis
Single displacement
Double displacement
Decomposition
During Photosynthesis energy is absorbed. What kind of reaction is it?
Physical
Exothermic
Endothermic
Photothermic
Count the number of atoms in the following compound: NH4CH3C00
4
7
12
15
How many atoms are in the compound: iron (II) sulfate
2
4
6
8
Which scientist discovered that most of an atom's mass is contained in its nucleus and the rest is nearly empty space?
Rutherford
Dalton
Bohr
Thomson
Ice melting
Chemical Change
Physical Change
Baking soda and vinegar combine to make carbon dioxide
Chemical Change
Physical Change
The Law of Conservation of Mass tells us matter can't ______________.
change color
change state of matter
be created or destroyed
change temperature
Cake batter baked in an oven
Chemical Change
Physical Change
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
the product is doubled
the product is half the mass of the reactants
the mass is the same
the mass changes depending on the reaction
How many O's are in Al₂(SO₄)₃
4
12
7
24
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
Si(OH)4+2NaBr--> SiBr4+NaOH
Si(OH)4+4NaBr--> SiBr4+4NaOH
Si(OH)4+NaBr--> SiBr4+4NaOH
Si(OH)4+2NaBr--> SiBr4+2NaOH
An extremely strong base would have a pH of...
1
7
9
14
The substance in the beaker
What equation do we use to solve for THE MASS when provided the number of moles?
m = n/M
n = m/M
m = n x M
n = m + M
What is the Molar Mass of H2SO4?
98.078 g/mol
49.073 g/mol
50.081 g/mcol
82.079 g/mol
According to the law of conservation of mass, how much zinc was present in the zinc carbonate?
256 g
88 g
104 g
40 g
What is CsNO3
Soluble
(aq)
Insoluble
(s)
What is PbSO3
Soluble
(aq)
Insoluble
(s)
The following properties are all characteristics of ionic compounds EXCEPT
high melting and boiling points
soft
crystal lattice structure
conduct electricity when dissolved in water
What properties does an ionic compound have?
A low boiling point and it conducts electricity when dissolved in water
A high melting point and it conducts electricity when liquid
A high boiling point and it conducts electricity when solid
At room temperature, are ionic compounds solids, liquids or gases?
solids
liquids
gases
The graph above is from which type of reaction?
Endothermic reaction
Exothermic Reaction
The graph above is from which type of reaction?
Endothermic reaction
Exothermic reaction
The initial temperature was measured to be 20oC and the final temperature was 10oC. The reaction was
exothermic
endothermic
What does 'A' represent on the energy profile diagram attached?
Products
Energy lost
Activation Energy
Overall change in energy
What does 'Z' represent in the energy profile shown here?
Reactants
Energy
Activation energy
Products
What does 'W' represent in the energy profile diagram shown?
Energy
Reactants
Products
Activation energy
What are the correct formulas and coefficients for the products of the following CSR?
Mg + Al(OH)3 →
No Reaction
Al + Mg(OH)3
Al + Mg(OH)2
MgAl + (OH)3
Predict the products of this synthesis reaction: H2 + Cl2 →
HCl
H2Cl2
H2Cl
HCl2
Complete the balanced equation for this Double Replacement reaction.
3 NaOH + Fe(NO3)3 →
NaFe + OH(NO3)3
NaNO3 + Fe(OH)3
3 NaNO3 + Fe(OH)3
3 NaFe + 3 (OH)NO3
