Chemistry Final
a balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. what is the volume of the balloon at this depth?
0.154 L
How many liters are in 333 mL?
0.333
suppose it took 108 joules of energy to raise a bar of gold from 25.0*C to 29.7*C. Given that the specific heat capacity of gold is 0.128 J/g*C, what is the mass (in grams) of the bar of gold?
1.8 x 10^2 g
Given that sodium chloride is 39.0% sodium by mass, how many grams of sodium chloride are needed to have 750. mg of Na present?
1.92
How much heat (KJ) is needed to raise the temperature of 100.0 grams of water from 25.0*C to 50.0*C?
10.5
what is the formula mass for potassium nitrate?
101.10 amu
what is equivalent pressure of 1520 torr in units of atm?
2.00
When rounding the number 2.348615 to 4 significant digits, what is the correct value?
2.349
What is the mass number of the hydrogen isotope that contains 2 neutrons?
3
How many moles of carbon are in 3.5 moles of calcium carbonate?
3.5
if the theoretical yield of a reaction is 42.0 grams of a product and the percent yield is 75%. How many grams were actually produced?
32
what is the molar mass of aluminum sulfate?
342.2 g/mol
Boyle's Law is expressed as
V is proportional to 1/P
Avogadro's Law is expressed as
V is proportional to n
to solve problems using Charles's Law, which mathematical equation should be used?
V1/T1 = V2/T2
to solve problems using Avogadro's la, which mathematical equation should be used?
V1/n1 = v2/n2
A solid form of matter in which there is long range repeating order is called
crystalline
hydroxides
do not undergo a gas evolution reaction when acid is added
soap
does not typically contain acid
A 42.7 gram sample of potassium nitrate contains how many grams of potassium?
16.5
Ions are formed when atoms
gain or lose electrons
A reaction which forms a gaseous product is an example of a(n)
gas evolution reaction
Mg magnesium
has only 12 protons
the empirical formula of a compound
indicates the simplest ratio of atoms in the compound
aluminum sulfide
insoluble
magnesium phosphate
insoluble
raisin bran
is a heterogeneous mixture
An atom containing 7 protons, 8 neutrons, and 7 electrons
is charge-neutral
torr
is not a common unit of energy
A reaction which forms a solid product is an example of a(n)
precipitation reaction
Dalton
proposed the modern Atomic Theory
How many moles of fluorine are in 3.2 moles of xenon hexafluoride?
19.2
Determine the answer for the question below with correct number of significant figures: 3.215 x 13.2 / 0.218 =
195
aluminum sulfate
soluble
potassium carbonate
soluble
the simplest formula for hydrogen peroxide is HO. To determine its molecular formula, it is necessary to know
the molar mass of hydrogen peroxide
One liter of a gas is in a sealed chamber containing a moveable piston. if the piston is moved so that the volume of the gas is compressed to a volume of one-half liter, what will happen to the pressure on the gas? (assume the temperature is constant and no gas particles are lost)
the pressure will be twice the original value
A balloon originally had a volume of 0.439 L at 44*C and a pressure of 729 torr. To what temperature must the balloon be cooled to reduce its volume to 378 mL if the pressure remained constant?
0*C
What is the correct decimal representation of 1.201 x 10^-7?
0.0000001201
What is the charge on a lithium atom that contains 2 e-?
1-
What is the density (g/mL) of an object that has a mass of 14.01 grams and, when placed into a graduated cylinder, causes the water level to rise from 25.2 mL to 33.6 mL?
1.7
if a mixture of gases contained 78% nitrogen at a pressure of 984 torr and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
1.75 atm
A 15.0 gram lead ball at 25.0*C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g*C, what is the final temperature of the lead?
46.1*C
The boiling point of water is ?
212*F and 373 K
when methane is burned with oxygen, the products are carbon dioxide and water. if you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of carbon dioxide were produced in the reaction?
22
How many moles of Cu are in 1.48 x 10^25 Cu atoms?
24.6
What is the value of -25*C on the Kelvin scale?
248
What is the mass percent of carbon in oxalic acid, H2C2O4?
26.7
How much heat (KJ) is absorbed by 948.0 g of water in order for the temperature to increase from 25.00*C to 32.50*C?
29.7
what is the pressure of a 3.00 L gas vessel that has 18.0 grams of helium at 25*C?
36.7 atm
How many kilojoules are there in 95.0 Calories?
397
a gas sample occupies 3.50 liters of volume at 20*C. What volume will this gas occupy at 100*C?
4.46 L
if 3.011 x 10^23 molecules have a mass of 20.04 grams, what is the molar mass of this substance?
40.08 g/mol
what is the correct scientific notation for the number 500.0?
5.000 x 10^2
The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. what is the percent yield?
56.0
A room has dimensions of 10.0 ft x 20.0 ft x 8.00 ft. Given that there are three feet in a yard, what is the volume of the room in yd^3?
59.3
Avogadro's number
6.022 x 10^23
what is the equivalent pressure of 760 torr in units of mm Hg?
760
1 atm is equal t
760 mm Hg.; 760 torr.; 101,325 Pa.; 14.7 psi.
a sample of 0.255 mole of gas has a volume of 748 mL at 28*C. Calculate the pressure of this gas.
8.42 atm
What is the formula for an ionic compound made of aluminum and oxygen?
Al2O3
who discovered the law of conservation of mass?
Antoine Lavoisier
you have 10.0 g each of Na, C, Pb, Cu and Ne. which contains the largest number of moles?
C
what is the formula for the acetate polyatomic ion?
C2H3O2-
Determine the empirical formula of a compound containing 83% potassium and 17.0% oxygen.
K2O
The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?
Law of Constant Composition
the following statement is not part of the rules for determining significant figures?
Non-zero digits at the end of a number are not significant.
To solve problems using Boyle's Law, which mathematical equation should be used?
P1 V1 = P2 V2
What is the correct formula for a compound that has three oxygen atoms and one sulfur atom?
SO3
a sample of wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1.2 grams. What happened to the rest of the wood?
The remaining 1.8 grams was converted into gaseous compounds.
the pressure of a gas is due to collisions of the gas molecules
True
what type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution?
acid-base neutralization
Group 1A elements are also called
alkali metals
What is the correct number of significant figures in the number 865,000?
ambiguous
Democritus
ancient Greek philosopher who proposed that matter was not continuous
what is the name of Ca(NO3)2?
calcium nitrate
what is the gas produced when hydrochloric acid is reacted with ammonium carbonate?
carbon dioxide
a reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of a(n)
combustion reaction
Metals are located where on the periodic table?
left side
The correct prefix for the multiplier 1,000,000 is?
mega
Xe is a member of which family?
noble gases