CHEM 1010 Exam 2
The correct formula for ammonium sulfate is?
(NH4)2 SO4
The correct name for BaCO3 is ___?
Barium Carbonate
2500 L of oxygen gas is produced at 1.00 atm of pressure. It is to be compressed and stored in a 20.0 L cylinder. If temperature is constant, calculate the pressure of the oxygen in the cylinder.
Boyle's Law: p1*v1 = p2*v2 1.00atm*2500 L = p2*20.0 L p2= 2500 L/20.0 L p2= 125 atm
The correct name for K2SO4 is?
Potassium Sulfate
A redox reaction can also be an?
Single Replacement and Combination
The direct change from the solid state to the vapor state is called:
Sublimation
Oxygen must gain two electrons to achieve a noble gas configuration...T/F
True
T/F: The atomic size of the elements in a group increase with the period number?
True
The outer shell of a noble gas always contains eight electrons...T/F
True
A covalent bond results when ____?
Two atoms share a pair of electrons
KNOW POLAR MOLECULES
When the electrons do not have an equal distribution of electrons in the orbit you have a polar molecule.In a polar molecule, the ends of the molecule (called dipoles) carry an unequal charge.
Which of the following distinguishing electron configurations is characteristic of noble gases?
np^5
Propane, C3H8, burns to produce carbon dioxide and water but the equation below. What is the coefficient in front of the carbon dioxide in the balanced equation? (C3H8 + O2 -> CO2 + H2O)
3
Which set of coefficients balances the equation? (CH4 -> C3H8 + 2H2)
3CH4 = C3H8 + 2H2
Which of the following molecules would be classified as polar covalent? (NaCl, CH3Cl, KCl, CaCls)
CH3Cl
The correct name for CeS is?
Cesium Sulfide
What is the oxidizing agent in the following reaction? 4HCl + MnO2 -> 2H2O + MnCl2
Cl
A balloon has a volume of 5.00 L at 22 degrees C and 1.00 atm of pressure. What will be the balloon's volume in liters if the pressure is increased to 3.00 atm at 22 degrees C?
Combined Gas Law: P1V1/T1 = P2V2/T2 =1.67 liters
A gas sample is collected in a balloon. What happens to the density of the gas sample as it is heated?
Decreases
Increasing the pressure on a gas at constant temperature does what to the volume of the gas?
Decreases
The correct name for the covalent compound N2O4 is ___?
Dinitrogen Tetroxide
In describing the strength of interparticle forces, we discover that the weakest forces of bonds are?
Dispersion
Which type of interparticle force leads to compounds with the lowest melting points?
Dispersion Forces
What rule, principle, or law is used to explain that an electron will not share the same orbital if there is an empty orbital of the same energy available?
Hund's Rule
KNOW ELECTRONEGATIVITY
Is a measure of the tendency of an atom to attract a bonding pair of electrons.The most electronegative element is fluorine. If you remember that fact, everything becomes easy, because electronegativity must always increase towards fluorine in the Periodic Table.
The ionic compound that forms between Magnesium and oxygen has the formula _____?
MgO
Consider the reactants and propose the right side of the equation. Mg + H2SO -> _______
MgSO4 + H2
When magnesium forms an ion, it would be represented as _____.
Mg^2+
What substance is reduced in the following reaction? 4HCl + MnO2 -> Cl2 + 2H2O + MnCl2
Mn
Which of the following is a noble gas? (neon, gold, platinum, chlorine)
Neon
Which of the following has the highest electronegativity? (O, N, Si, P)
O
Single replacement reactions are always?
One element replaces another element
Calculate the volume in liters of 3.50 moles of gas at STP.
PV=nRT (22.4 L is STP for one mole) V=(3.5)(22.4) = 78.4