Ch. 6
What is limiting reactant?
The reactant that will be used up first in a reaction.
What are valence electrons, and how do you count them?
They are the outermost electrons! You count them by their group # (the column they're in)
increases up and to the right
Name 2 units of pressure in this unit.
Pa/kPa, torr, atm, psi, mmHg
What equation should you use to find heat, using specific heat capacity?
Q = mcΔT
What's special about the d and f blocks?
the d coefficient is 1 less than its row
the f coefficient is 2 less than its row
Rank the following elements in order of decreasing electronegativity:
S, Se, O
O, C, N
O, S, Se
O, N, C
Why do you have to be careful with temperature using gas laws?
You HAVE to convert to Kelvin!
Use the balanced equation below. How many moles of oxygen are needed to produce 0.085 mol of water?
2C2H2 + 5O2 → 4CO2 + 2H2O
0.21 mol
How many valence electrons are in Xe2+?
6
Draw the Lewis structure for N22-
2 double-bonded nitrogens, each with 2 lone pairs, and brackets with a 2-
What 2 variables does Boyle's Law use? What 2 does Charles' Law use?
Boyle's Law: pressure and volume
Charles' Law: volume and temperature
Calculate the energy required to heat 824.0 g of ammonia from 54.6°C to 66.9°C. Assume the specific heat capacity of ammonia is 4.70 J/(g·K).
47.6 kJ
What is the condensed electron configuration for indium (In)?
[Kr]4d105s25p1
Is CH3F polar or nonpolar?
If it's polar, what is the atom closest to the negative side?
polar
F (more electronegative)
The atmospheric pressure in La Paz, capital of Bolivia, is 0.632 atm. Calculate the atmospheric pressure in mmHg and torr.
480. mmHg
480 torr
Use the equation below. What mass of NH3 is consumed to make 8.76 g of O2?
4 NH3 + 5 O2 → 4 NO + 6 H2O
3.73 g
Rank the following in order of decreasing ionization energy:
Ga, He, Ra
He, Ga, Ra
How many Lewis structures does S2O have? (resonance)
2
1. S=S-O
2. S-S=O
An arctic weather balloon is filled with 24 L of helium gas. The temperature inside the shed is 13°C. The balloon is then taken outside, where the temperature 3°C. Calculate the new volume of the balloon.
23.2 L