Unit 1&2
How many valence electrons are in an atom of chlorine?
7
How many valence electrons does the potassium atom have?
One
What is a hydrogen ion donor called?
An acid.
What is the temperature at absolute zero?
0 K (all molecular motion stops)
You have an acid that dissociates partially in solution. Is this a strong or weak acid?
Weak acids dissociate partially. Strong acids and bases dissociate (break apart) completely in water.
How many valence electrons does aluminum have?
3
How many valence electrons does the magnesium atom have?
Two
What is a hydrogen ion acceptor called?
A base
Equal volumes of gases at STP have equal _____.
Moles
Given the reaction at equilibrium:
1/2 N2 (g) +1/2 O2 (g) + 21.6 kcal ---> NO (g)
What will happen if temperature is increased?
Increasing temperature means heat is being added more to the left side (think mud slide). The reaction will shift right to form more NO.
Which of the following has the greatest freedom of movement: solids, liquids, gases?
Gases
How many valence electrons does chlorine have?
Tastes bitter; acid or base?
Base.
What is 98K in degrees Celsius?
(Celsius = Kelvin - 273)
Answer: -175 degrees Celsius
Find the molar mass of Al2(SO4)3
342 g/mol
Are noble gases reactive?
No. They have a full octet of electrons. They do not want to react with anything.
..
: Ne :
..
Lewis Dot Structure for Neon
pH < 7 ; acid, base, or neutral?
Acid
What is the volume occupied by 1 mole of a gas at STP?
1 mole of gas at STP = 22.4 L
C2H4 + 3 O2 ----> 2 CO2 + 2 H2O
If you start with 45 grams of ethylene (C2H4), how many grams of carbon dioxide will be produced?
141.4 g CO2
Identify the following as a metal, semimetal, transition metal, or nonmetal:
H, C, K, Fe, Si
H - nonmetal
C - nonmetal
K - metal
Fe - transition metal
Si - semimetal
.
: F :
..
Lewis Dot Structure for Fluorine
Ammonia, acid or base?
Base (drain cleaners are bases).
Define STP.
Pressure = 1 atm or 101.3 kPa
Temperature = 0 degrees Celsius or 273 K
Mg + 2 HNO3 ---> Mg(NO3)2 + H2
If I start this reaction with 40.0 grams of magnesium and an excess of nitric acid (HNO3), how many grams of hydrogen gas will I produce?
3.3 g H2