1
calculate the molar mass of NaCl
AMUs
Na: 22.990
Cl:35.453
58.443
reactants appear on which side of the chemical reaction?
reactants appear on the left side of the reaction
does the temperature of a pure substance change when a phase change occurs?
no, the heat energy applied is converted to kinetic energy on the particle level.
which type of compound has a higher boiling point, covalent or ionic?
ionic compounds have higher boiling points because their bonds are higher in energy meaning it takes more energy to break an ionic bond as compared to a covalent bond.
list the 4 colligative properties
Vapor pressure
boiling point
freezing point
osmotic pressure
what is avagadro's number and what is it used for
6.022x10^23
it is used to convert between moles and number of particles
calculate the percent yield:
Expected: 75.387
Actual: 72.5
96.2%
name the three intermolecular forces in increasing order
1. london dispersion forces
2. dipole dipole forces
3. hydrogen bonding
which compound will have a lower melting point 1.0 M LiF or 1.0 M CO
CO has a lower melting point because it is held together by covalent bonds, LiF is ionic.
If some Hydrogen is removed from this reaction what way will the reaction shift?
2H2 + O2 --> 2H2O
towards the reactants, left
balance the following chemical equation
SiCl4 + H2O --> H4SiO4 + HCl
SiCl4 + 4H2O --> H4SiO4 + 4HCl
an electron is gained by an atom
What atoms can form a hydrogen bond?
O (oxygen), F (fluorine), and N (nitrogen)
in a hypertonic solution a cell will:
shrink, in a hypertonic solution the outside has a higher solute concentration than the inside of the cell causing water to move out of the cell.
polar molecules have what kind of intermolecular forces?
london dispersion, dipole dipole, and possibly hydrogen bonding.
london dispersion, dipole dipole, and possibly hydrogen bonding.
How many moles are in 4000. milligrams of of HCl?
H: 1.008
Cl: 35.453
0.1097 moles
which species is oxidized during this reaction? which is reduced?
Zn + CuSO4 --> ZnSO4 + Cu
Zn is oxidized, CuSO4 is reduced
Calculate the molarity of 14 L solution with 7.0 grams of CaCl2.
Ca: 40.078
Cl: 35.453
4.5x10^-3
what is osmotic pressure?
the minimum pressure required to prevent a pure solvent from flowing into a more concentrated solution across a membrane.
explain the difference between an Intermolecular force and a bond.
an intermolecular force is an attraction between atoms whereas a bond is a sharing of electrons or a very strong electrostatic attraction that forms a connection between the atoms
Ethane (C2H6) reacts with oxygen gas (O2) to produce carbon dioxide and water. If 30 grams of ethane is mixed with 84 grams of oxygen how many grams of water will be produced and which reagent is limiting?
C: 12.01
H: 1.008
O: 16.00
40.54 grams of H2O, the oxygen gas is the limiting reagent
A sample of gas at 25.0 °C has a volume of 11.0 L and exerts a pressure of 1.00 atm. How many moles of gas are in the sample?
0.450 mol
30 mL of a 5.0 M solution are placed into a 100 mL beaker and diluted with 50 mL of water. What is the molarity of the new solution?
1.9 M
calculate the weight percent (per volume) of a 5.0 liter, 4.0 M NaCl solution.
Na: 22.990
Cl: 35.453
23% NaCl
write the Keq for the following reaction
2HCl (aq) + 2 Na (s) --> 2 NaCl (s) + H2 (g)
Keq = [H2]/[HCl]^2