Unit 1: Atoms
How many grams are in 5 moles of Calcium?
~200.39 g of Calcium
Draw the lewis structure in the correct VSEPR shape for: O2 . Include bond angles.
will check answers (linear). 180 degrees.
Under what conditions do real gasses behave like ideal gasses?
High temperatures and low pressures.
What’s a complete molecular equation?
Shows everything that’s aqueous split up into ions and includes spectator ions
When would we use an ICE table?
When we want to find either the change in concentration as a reaction reaches equilibrium, the equilibrium concentrations, or the initial concentrations.
Atoms with the smallest atomic radii will be found where on the periodic table?
Up and to the right
Draw the lewis structure in the correct VSEPR shape for: NO2-. . Include bond angles.
will check answers (bent). 120 degrees.
What is meant by STP?
0 degrees Celsius or 273.15 K, and 1 atm
What’s the oxidation number of oxygen in O2?
0
If Q < K, does that mean the reverse reaction or the forward reaction will be favored?
Forward reaction. Pushin' P!!
Ionization energy increases in the periodic table...
As you go up a group and from left to right
Draw the lewis structure in the correct VSEPR shape for: PO4-3 . Include bond angles.
will check answers (tetrahedral). 109.5 degrees.
What's the concentration of a NaCl solution containing 5 moles of NaCl dissolved in 2 L of water?
2.5 mol / L or 2.5 M
What’s the oxidation number of carbon in CO2?
+4
What is the only factor that will change the value of the equilibrium constant?
Temperature
What does ionization energy refer to?
Energy needed rip away a valence electron from an atom
Draw the lewis structure in the correct VSEPR shape for: COH2. Include bond angles.
will check answers (trigonal planar). 120 degrees.
Order these chemicals in terms of increasing IMF strength: CH4, C8H16OH, C8H18
CH4 < C8H18 < C8H17O
If a spectrophotometer absorbance reading is lower than it should be, what’s one possible reason for this?
Water still present, which diluted the sample.
Will increasing the temperature of an exothermic reaction increase or decrease the equilibrium constant?
What are the two factors in determining the strength of the attractive force between two charged particles in Coulomb's Law?
Distance and size of the charge
Draw the lewis structure in the correct VSEPR shape for: NCl3. Include bond angles.
will check answers (trigonal pyramidal). 109.5.
What is meant by the phrase like dissolves like?
Nonpolar substances tend to dissolve nonpolar substances, and polar substances tend to dissolve polar substances.
What’s a spectator ion?
Ion that does not actually participate in the chemical reaction
Write the Ksp expression for the following reaction:
MgCl2 (s) ⇌ Mg+2 (aq) + 2 Cl-1 (aq)
Ksp = [Mg][Cl]2