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WorksheetsChemistry Term 2 Review Practice
Total questions: 120
Worksheet time: 2hrs 22mins
Which correctly describes why ionic compounds have high melting points?
They have weak intermolecular forces.
They have strong covalent bonds.
They have strong electrostatic forces between ions.
They have low molecular weights.
Which element will have an electronegativity value greater than chlorine?
Sodium
Fluorine
Oxygen
Hydrogen
Which is a property of covalent compounds?
High melting points
Conduct electricity in solution
Low boiling points
Form crystal lattices
Which of these is an example of an intermolecular force?
Ionic bond
Covalent bond
Hydrogen bond
Metallic bond
Which property should the students test to find out which compound has the strongest intramolecular forces and why?
Melting point, because higher melting points indicate stronger forces.
Color, because it shows the type of bond.
Solubility, because it indicates bond strength.
Density, because it reflects molecular weight.
What is electronegativity?
The ability of an atom to attract electrons in a bond.
The energy required to remove an electron.
The size of an atom.
The number of protons in an atom.
Which correctly describes the molecular structure of polypropylene carpet fibers, and explains why the material is good for making carpet?
They are ionic, making them strong.
They are metallic, making them conductive.
They are covalent, making them durable.
They are polar, making them water-resistant.
Why does ionization energy display the stair-step increase when moving from left to right across a row of the Periodic Table?
Due to increasing atomic radius
Due to decreasing nuclear charge
Due to increasing nuclear charge
Due to decreasing electron shielding
How are chemical formulas for covalent compounds BEST determined from their prefixes?
By using the atomic number
By using the number of atoms indicated by the prefixes
By using the atomic mass
By using the electron configuration
What type of bond is formed when electrons are shared between atoms?
Hydrogen bond
Metallic bond
Covalent bond
Ionic bond
Which of the following elements is most likely to form a covalent bond?
Chlorine
Potassium
Sodium
Argon
When sodium chloride dissolves in water, how do the water molecules orient around the ions?
The oxygen atoms point toward both the sodium ions and the chloride ions.
The oxygen atoms point toward the sodium ions, and the hydrogen atoms point toward the chloride ions.
The hydrogen atoms point toward the sodium ions, and the oxygen atoms point toward the chloride ions.
Water molecules are randomly oriented around the ions.
In a nonpolar covalent bond, the electrons gather around...
Mostly the atom with the greatest electronegativity
The atom with the lowest electronegativity
Each atom Equally
Only the atom with the greatest electronegativity
In a polar covalent bond, the electrons gather around...
Mostly the atom with the greatest electronegativity
The atom with the lowest electronegativity
Each atom equally
Only the atom with the greatest electronegativity
The polarity of a bond is determined by...
The sum of the electronegativities of the two atoms
The difference in the electronegativities of the two atoms
The charges of the atoms
The number of electrons shared in the bond
Which substance has the weakest intermolecular forces?
Substance A, boiling point of 75 °C
Substance B, boiling point of 105 °C
Substance C, boiling point of 25 °C
Substance d, boiling point of 45 °C
The weaker the intermolecular forces of a substance the _____________ the boiling point
higher
lower
(a) covalent compounds have a partial negative charge on one side and a partial positive charge on the other side.
In a polar bond, the atom that is more electronegative attracts the shared electrons more strongly. This results in it having a partial (a) charge.
In a water molecule, the hydrogen side of the molecule has a slightly (a) charge.
Liquid ethylene (C2H2) molecules are nonpolar and do not experience hydrogen bonding, liquid water (H2O) molecules are polar and experience hydrogen bonding. Which liquid will have a higher boiling point?
water
ethylene
water and ethylene have the same boiling point
Water is a polar compound.
true
false
Magnesium can be burned in oxygen to produce solid magnesium oxide.
Mg + O2→ MgO
Mg+ O→ MgO
Mg + CO2 → MgO + C
Mg + O2→ Mg2O2
Sodium reacts with chlorine gas to produce sodium chloride.
NaCl→ Cl + Na
Na+ CO2 → NaCO2
Na + Cl2→ NaCl
Na + Cl → NaCl
Iron reacts with solid sulfur to produce iron(II) sulfide powder.
Fe + S → Fe2S
Fe + S → FeS
Fe2 + S→ Fe2S2
Fe + S2 → Fe2S
When lead reacts with oxygen, a yellow lead(II) oxide powder is produced.
Pb + O2 → PbO
Pb + O2→ PbO2
Pb2 + O2→ Pb2O
Pb + O → PbO
When hydrogen reacts with sulfur, a smelly gas, dihydrogen monosulfide, is produced.
H2 + S → HS
H2 + S → H2S
H + S→ HS
H + S→ H2S
Hydrogen gas and nitrogen monoxide gas forms water and nitrogen gas.
H2 + NO --> H2O + N2
H + NO --> H2O + N
H2 + N2O3 --> H2O + N2
H + NO --> H2O + N2
Aluminum bromide and chlorine gas produce aluminum chloride and bromine gas.
AlBr3 + Cl2 --> AlCl3 + Br2
AlBr3 + Cl --> AlCl3 + Br
Al3Br + Cl --> Al3Cl + Br2
AlBr3 + Cl2 --> AlCl3 + Br
Hydrogen gas and chlorine gas produce hydrogen chloride
H2 + Cl2 --> HCl
H + Cl --> HCl
H2 + Cl2 --> H2Cl2
H + Cl --> H2Cl
Aluminum and oxygen produces aluminum oxide
Al + O2 --> Al2O3
Al + O --> Al2O3
Al3 + O2 --> Al2O3
Al + O --> AlO
In the reaction, A + B --> C, what letter(s) represent the reactants
C Only
A Only
B Only
A and B
A substance that speeds up the reaction but is unchanged during a reaction
inhibitor
reactant
product
catalyst
Same number of atoms on both sides of the arrow
Atomic Theory
Equality
Balanced Equation
Reaction Equilibrium
Matter is neither created or destroyed it only changes form is known as what?
Law of Creation
Law of conservation of energy
Law of conservation of mass or matter
Law of Chemistry
One or more substance are converted to one or more substances
Physical Change
Chemical Reaction
Boiling
Freezing
A process where energy is absorbed, therefore temperature decreases.
Exothermic
Endothermic
Reaction Rate
Freezing
Minimum energy required to for a chemical reaction to occur
Reaction energy
Potential Energy
Activation Energy
Breaking Energy
Elements that exists as two atoms combined together (example: O2, H2)
monoatomic
diatomic
polyatomic
biatomic
A process where energy is released, therefore temperature increases.
Endothermic
Decomposition
Exothermic
Absorption
This is a list that determines if a single replacement reaction will occur (it organizes the elements based on reactivity)
Reactivity List
Single Reaction List
Periodic List
Activity Series
New material being formed during a reaction
Products
Reactants
Solid
Gases
Starting material in a reaction
Products
Reactants
Solids
Gases
N2 +3 H2 --> 2NH3
__Ag2O →__ Ag +___O2
__P4 + __O2 --> __P2O3
For the following equation, what is the coefficient for LiCl?
___LiBr + ___Cl2 --> ___Br2 + ___LiCl
0
1
2
3
What is the molar mass of C2H4O2?
40 g/mol
50 g/mol
60 g/mol
68 g/mol
The number 6.02 x 1023 is called...
Obama's number and it measures the amount of gases or liters in a mole
Bohr's number and it measures the amount of molecules or atoms in a sample
Avogadro's number and it measures the amount of gas in moles
Avogadro's number and it measures the amount of molecules or atoms in a sample
_N2 + _H2 → _NH3
What is the mole ratio between N2 and NH3 if you balanced the above equation correctly?
1 moles NH3 / 2 moles N2
2 moles NH3 / 1 moles N2
2 moles N2 / 3 moles NH3
1 moles N2 / 3 moles NH3
Which of the following represent a mole ratio between silver nitrate and copper(II) nitrate in the following reaction:
2AgNO3 + _Cu → _Cu(NO3)2 + 2Ag
2 : 2
1 : 2
1 : 1
2 : 1
Using the following equation:
_Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
4 moles Fe
6 moles Fe
9 moles Fe
2 moles Fe
2Na + 2H2O → 2NaOH+ _H2
How many grams of hydrogen are produced if 120 g of Na are available?
5.2 g
2.6 g
690 g
45 g
2 NaClO3 (s) → 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
64 g of O2
576 g of O2
288 g O2
0.563 g O2
Q= m c ∆T
The units for specific heat are:
If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________
one reaches a temperature of zero
they both have an equal temperature
one runs out of energy
For a skillet, used for cooking, do you want a high or low specific heat
High, so that it will need more energy to heat up
Low, so that it will change temperature quickly
What does "q" mean?
A measure of heat energy
A change in heat energy
A measure of kinetic energy
A change in temperature
What is the temperature of the metal cube when thermal equilibrium is achieved between the cube and the liquid?
What does "ΔT" mean?
A change in health
A change in heat
A change in height
A change in temperature
Thermal energy ALWAYS moves from _____ to _____.
cold to hot
hot to cold
A metal cube at temperature of 70°C is immersed in water at temperature of 20°C. The metal _______ heat while the water __________ heat.
gains, loses
loses, gains
Identify the given m in problem:
15.75 g
1086.75 J
150°C
unknown (aka ?)
Identify the given q in problem:
15.75 g
1086.75 J
150°C
unknown (aka ?)
identify the c in the problem
10.0 g
33°C
0.90 J/g°C
unknown (aka ?)
1 food Calorie is equal to how many small calories?
4.18
1000
4184
1
What is the definition of a calorie?
The amount of energy needed to raise 1 g H2O by 1ºC.
The amount of energy needed to raise 1000 g H2O by 1ºC.
The amount of energy needed to raise 1 L air by 1ºC.
The amount of energy needed to raise 1 g H2O by 10ºC.
6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O2
endothermic reaction
exothermic reaction
Is this diagram endothermic or exothermic
Endothermic
Exotermic
Exothermic
Endote
Is the combustion of propane endothermic or exothermic?
Endothermic
Exothermic
Is this reaction endothermic or exothermic?
Which of the following process is exothermic?
Candle was melting
A puddle evaporating
Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide
Water freezing to form ice
What term is given to a reaction which transfers heat energy to the surroundings?
Endothermic
Reversible
Exothermic
Exotermic
Calculate the heat absorbed by 105.0 grams of water when it is heated to cook spaghetti. The initial temperature of the water is 20.0°C, and the final temperature of the water is 99.0°C. The specific heat of water is 4.18 J/g•°C.
8778 J
0.0005 J
34673 J
43451.1 J
Equal masses of copper, stainless steel, carbon steel, and zinc were all heated using 10,000 JOULES of thermal energy. What material would be have the LARGEST change in temperature?
Copper
Carbon Steel
Zinc
Stainless Steel
For the graph, choose the CORRECT statement.
The rate of reaction slowly increase
The systems never reach equilibrium
At equilibrium, more NO2 is present than N2O4.
At start of reaction, only NO2 was present.
Which of the following are equal for a chemical system at equilibrium?
The concentrations of reactant and products are equal
The rate constants for the forward and reverse reactions are equal
The time that a particular atom or molecule spends as a reactant and product are equal
The rate of the forward and reverse reaction as the equilibrium has achieved
Which of the following statements is CORRECT for a reaction at an equilibrium?
The rate of forward and reverse reactions are equal.
The final concentrations of product and reactant are equal.
The initial concentrations of product and reactant are equal.
The rate constant of the forward and reverse reactions are equal.
Label the parts of the reaction diagram.
reactants
products
activation energy
Which of the following would increase the rate of reaction? Select ALL correct answers.
Addition of a catalytst
Increasing the temperature
Decreasing activation energy
Decreasing the energy of the products
Increasing the concentration of reactants
Reaction rates are increased by (a) the (b) between reactants.
What does it mean for a chemical reaction to be in equilibrium?
Which represents the addition of an enzyme in the reaction?
3
4
2
1
Which chemical is a proton donor?
Acid
Base
Which chemical is a proton acceptor?
Acid
Base
Which chemical reacts with most metals?
Acid
Base
Which chemical produces an H3O when mixed with water?
Acid
Base
Which chemical produces an (OH) when mixed with water?
Acid
Base
Which chemical feels slippery on the skin?
Acid
Base
Which pH number below reflects a weak acid?
1
6
8
13
Which pH number below reflects a weak base?
1
6
8
13
Which pH number below reflects a strong base?
1
6
8
13
Which pH number below reflects a strong acid?
1
6
8
13
What would happen to the blue and red litmus papers when they are dipped into a sample of acid rain?
Blue litmus paper remains blue and red litmus paper remains red.
Blue litmus paper turns red and red litmus paper turns blue.
Blue litmus paper remains blue and red litmus paper turns blue.
Blue litmus paper turns red and red litmus paper remains red.
If the [H+] of a solution is 1 x 10-2 M the pH is
2
12
-2
1
Which solution is the best conductor of an electric
current?
0.001 mole of NaCl dissolved in 1000. mL of
water
0.005 mole of NaCl dissolved in 1000. mL of
water
0.1 mole of NaCl dissolved in 1000. mL of
water
0.05 mole of NaCl dissolved in 1000. mL of
water
The table below shows the molar concentrations of
hydronium ion, H3O+, in four different solutions.
Which solution has the highest pH?
A
B
C
D
When the concentration of hydrogen ions in a solution
is decreased by a factor of ten, the pH of the solution
increases by 1
decreases by 1
increases by 10
decreases by 10
The concentration of which ion is increased when LiOH is dissolved in water?
hydroxide ion
hydrogen ion
hydronium ion
halide ion
When the pH changes from 5 to 7
hydrogen ion concentration decrease by 10
hydrogen ion concentration decrease by 100
hydrogen ion concentration decrease by 2
hydrogen ion concentration decrease by 20
