Unit 1 & 2
Unit 5 & 7
Unit 3 & 6
Unit 9 & 10
Unit 11 and 13-15
100
The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
12
100
Based on the periodic table, how many protons are found in an atom of iron (Fe)?
26
100
The formation of an ionic bond involves the _____ of ______
transfer of electrons.
100
A researcher needs to combine 500 mL of two reactants for an investigation. However, the reaction is strongly exothermic and tends to damage equipment when the reactants are simply mixed together. To keep the reaction from damaging equipment, what is the BEST way to modify the reaction process?
Slowly add one of the reactants to the other inside the equipment.
100
What is the pH of an aqueous solution that has a hydroxide ion concentration of 
M?
9
200
How many electrons are in the outermost energy level of a neutral carbon atom?
4
200
Which group on the periodic table contains elements that are the LEAST reactive?
group 18 (8A)
200
How does a single covalent bond between two carbon atoms compare to a double covalent bond between two carbon atoms?
A single covalent bond is weaker and has a longer bond length than a double covalent bond.
200
Magnesium burns in air according to the balanced equation below.
Which of the following BEST characterizes this reaction? (type and endo v exo)
exothermic synthesis reaction
200
How does the change in components of a chemical reaction at equilibrium differ from the change in components when the reaction is not at equilibrium?
At equilibrium, there is no change in components while there is always a change when the reaction is not at equilibrium.
300
Which part of an atom creates most of the atom’s volume?
electron
300
When geologists are trying to identify certain rocks, they often place a few drops of diluted hydrochloric acid on the rocks. Sometimes the rocks effervesce when acid is dropped on them. What are the geologists most likely trying to determine?
the chemical properties of the rocks
300
What is the chemical formula of a compound with the IUPAC name of aluminum cyanide?
Al(CN)3
300
There are water droplets on the outside of a clean beaker. Two chemicals are added to the beaker. These chemicals react with each other. During the reaction, the water droplets outside the beaker freeze. Which statement BEST describes the reaction? (exo v endo and why)
endothermic, because energy is absorbed
300
A solution has an
concentration of 0.0001 M. What is the pH of the solution?
4
400
What color of light does a hydrogen atom emit when an electron transitions from the n=6 energy level to the n=2 energy level?
violet
400
Ozone is three oxygen atoms bonded together. It can sometimes be smelled in the air after a thunderstorm. The smell is a result of...
a chemical change.
400
Oxygen atoms have an electronegativity value of 3.44, and carbon atoms have an electronegativity value of 2.55. What type of bond forms between carbon and oxygen?
polar covalent bond
400
A scientist distilled a quantity of water to use in an experiment. How much water did he collect if the condensation process released 9040 J of energy?
0.222 mol
400
When adding sugar to tea, it was observed that the sugar kept dissolving. When ice was added, some sugar precipitated to the bottom of the glass. The mixture is then considered to be
saturated
500
In his model of the atom, Bohr proposed that electrons move at fixed distances from the nucleus and that the energy of the electron is related to its orbit. What discovery contributed to the development of this atomic model?
Elements have characteristic wavelengths of light emission and absorption.
500
what would the precipitate be in the reaction below?
Ag2SO4
500
Physicists have described four basic forces in the universe. Which one of the four basic forces holds the protons together within the nucleus of the oxygen atom in a water molecule?
strong force
500
Air conditioners contain refrigerant, a substance that circulates through pipes of the system. The refrigerant transfers large amounts of heat from the air inside a room to the air outside by using a continuous cycle of evaporation and condensation. Which of the following BEST explains why evaporation and condensation play an important role in air conditioning?
Substances absorb heat energy when they evaporate and release heat energy when they condense.
500
The following chemical reaction is at equilibrium:
Which statement is true pertaining to the concentrations of the elements?
The concentrations of SO2 and O2 are not changing.