AP Chemistry Semester 1 Exam Review
According to the following reaction, how much energy is evolved during the reaction of 32.5 g B2H6 and 72.5 g Cl2? The molar mass of B2H6 is 27.67 g/mol
238 kJ
What value of I is represented by a f orbital?
3
What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362+41) / 63.498
4.57
Choose the statement below that is TRUE.
A weak acid solution consists of mostly nonionized acid molecules.
Near Cozumel, Mexico, a scuba diver goes down 60 ft to look at the sea creatures. As she descends, the air pressure increases. Which gas law is this an example of?
Boyle's Law
What does "X" represent in the following symbol? 80 _____ X 35
Bromine
Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.
C6H15O6
What species is represented by the following information? p+ = 17 nº = 18 e- = 18
Cl-
Identify the species oxidized.
Fe
Dalton's Atomic Theory states
that matter is composed of small indestructible particles
The statement, "In a chemical reaction, matter is neither created nor destroyed" is called
the Law of Conservation of Mass
Define energy
the capacity to do work
Define pressure.
the force exerted per unit area by gas particles as they strike the surfaces around them
Molecules can be described as
two or more atoms chemically joined together
Choose the homogeneous mixture from the list below. a. cola float b. wine c. concrete d. trail mix e. chunky spaghetti sauce
wine
What is the volume of 5.60 g of O2 at 7.78 atm and 415 K?
0.766 L
Calculate the change in internal energy (∆E) for a system that is giving off 25.0 kJ of heat and is changing from 12.00 L to 6.00 L in volume at a.50 atm pressure.
-24.1 kJ
For ∆Esys to always be -, what must be TRUE?
-w > +q
Determine the density of NH3 has at 435 K and 1.00 atm.
0.477 g/L
In Lhasa, Tibet, the elevation is 12,000 feet. The altimeter reading in an airplane is 19.00 in Hg. This pressure is equal to ________ atm.
0.635
A mixture of 10.0 g of Ne and 10.0 g Ar have a total pressure of 1.6 atm. What is the partial pressure of Ne?
1.1 atm
How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol
1.10 x 10^24
Determine the volume of hexane that contains 5.33 x 10^22 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol
11.6 mL
Calculate the mass percent composition of lithium in Li3PO4
17.98%
Give the number of core electrons for F-.
2
Identify the exact number a. 2 b. 2.0 c. 2.000 d. 2.0000
2
Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed.
2 Li +(aq) + S 2-(aq) + Cu 2+(aq) + 2 NO3 -(aq) --> CuS(s) + 2 Li +(aq) + 2 NO3 -(aq)
How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s) + N2(g) --> 2 Li3N(s)
20.3 g Li3N
Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm^3.
23.6 mL
According to the following reaction, what volume of 0.244 M KCl solution is required to react exactly with 50.0 mL of 0.210 M Pb(NO3)2 solution? 2 KCl(aq) + Pb(NO3)2(aq) --> PbCl2 + 2 KNO3(aq)
86.1 mL
To what temperature must a balloon, initially at 25ºC and 2.00 L, be heated in order to have a volume of 6.00 L?
894 K
According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed? 2 H2S(g) + SO2(g) --> 3 S(s) + 2 H2O(l)
99.8 g S
Which of the following statements about subatomic particles is TRUE?
A neutral atom contains the same number of protons and electrons
Which of the following statements about the phases of matter is TRUE?
In both solids and liquids, the atoms or molecules pack closely to one another
Give the spectator ions for the reaction that occurs when aqueous solutions of H2SO4 and KOH are mixed.
K + and SO4 2-
Which of the following types of electromagnetic radiation has the lowest frequency?
Orange
Which of the following is an example of the law of multiple proportions?
Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C
Which of the following represents a hypothesis?
When a substance combusts, it combines with air.
Give the ground state electron configuration for Se.
[Ar]4s^2 3d^10 4p^4
A substance that can't be chemically broken down into simpler substances is
an element
A chemist mixes sodium with water and witnesses a violent reaction between the metal and water. This is best classified as
an observation
Identify a liquid a. definite volume and definite shape b. definite volume and no definite shape c. definite shape and no definite volume d. no definite shape and no definite volume
definite volume and no definite shape
Which change is a physical change? a. iron rusting b. dynamite exploding c. gasoline evaporating d. wood burning
gasoline evaporating
Identify a gas a. definite volume and definite shape b. definite volume and no definite shape c. definite shape and no definite volume d. no definite shape and no definite volume
no definite shape and no definite volume
Energy that is associated with the motion of an object is called
kinetic energy
Give the set of four quantum numbers that could represent the electron gained to form the Br ION from the Br atom.
n=4, I=1, mI=1, ms=-1/2
Identify the equipment that Millikan utilized to do his research.
oil atomizer, light source, microscope
Identify the description of an atom.
protons and neutrons in nucleus; electrons in orbitals
Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as losing heat to the surroundings?
q = - ; w = -
What are the possible orbitals for n=3
s, p, d
