What equation is used to calculate the heat needed to change the temperature of a substance? Define all variables.
Q=mSHΔt (mass, specific heat, change in temperature)
100
This type of bond is the result of the sharing of a pair of electrons between atoms, whereas this type of bond is the result of a transfer of electrons.
What are covalent and ionic bonds?
100
A net separation of charge is referred to as this.
What is a dipole?
100
What are the three types of intermolecular forces?
What is Dipole, hydrogen bonds, dispersion forces.
200
A homogeneous mixture of two or more substances.
What is a solution?
200
This property of volatile liquids such as water depends upon the temperature and must be considered as a partial pressure when a gas is collected over the volatile liquid.
What is vapor pressure?
200
These are the electrons involved in covalent bonding.
What are valence electrons?
200
Is N2 polar or nonpolar?
Nonpolar
200
Polar molecules exhibit these intermolecular forces.
Dispersion forces and either dipole or hydrogen bonds.
300
The terms indicating “not much solute” and “a lot of solute” respectively.
What are dilute and concentrated?
300
How are molar enthalpies of fusion, vaporization and sublimation written?
ΔHfus ΔHvap ΔHsub
300
This is the ability of an atom to attract the electrons forming a covalent bond.
Bonus 200 points: What is the periodic table trend for this?
What is electronegativity?
Bonus: Increases going across and decreases going down the table.
300
Is H2O polar or nonpolar?
Polar
300
Which intermolecular forces do nonpolar molecules exhibit?
Dispersion forces
400
How many moles of HCl are in 15.0ml of 6.00M HCl?
.0900 moles HCl
400
Draw and label the graph of temperature versus heating which shows the phase changes from solid through gas.
400
These types of ions are typically formed from metals and have lost electrons, whereas this other type of ion typically forms from nonmetals which have gained electrons.
What are cations, anions?
400
This type of molecule has no net separation of charge.
What is nonpolar molecule?
400
When comparing strengths of dispersion forces, it is directly related to which property of the molecule?
Molar mass/size
500
Calculate the molarity of a solution made by dissolving 12.10 grams of NaCl in enough water to result in a solution volume of 250.0ml.
.8281M
500
Calculate the heat needed to convert 25 grams of water at 75°C to gas at 100°C. ΔHvap is 40.7kJ/mole.
59210J or 59.21kJ
500
Write the chemical formula (with charge indicated) for the following polyatomic ions: Ammonium, Hydroxide, Carbonate, Phosphate, Nitrate, Sulfate, Hydrogen Carbonate.