Trends
In a periodic table, what do you call it when you move left to right across the table?
period
What type of bond has a shared pair of electrons?
Covalent bond.
What is the molarity of a solution with 2 moles of NaCl dissolved in 1 liter of water?
2 M
What does it mean when a chemical reaction is at equilibrium?
When the forward and reverse reactions happen at the same rate, and the amounts of substances are the same.
what is the lectron configuration of beryllium
1s22s2
What is the name of the first group on the periodic table?
Alkali Metal
How many valence electrons are used in CH4?
ou dissolve 0.5 moles of Helium in 2 liters of water, What is the molarity of the solution?
0.25M
How does concentration affect reaction?
Increasing concentration makes the reaction faster because there are more particles colliding.
What are the 4 types of orbitals?
s, p, d, f
What is the most electronegative element in the periodic table?
fluorine
How many lone pairs are in NH3?
1 lone pair.
How many moles of kBr are needed to make 500mL of a 1.5 M solution?
0.75 moles
N2(g) + 3H2(g) ⇌ 2NH3(g) What happens to the equilibrium if more H2 is added?
shift right
What is the noble gas configuration is Xenon
[Kr} 5s24d10
Why does the atomic radius decrease when going down a group
shielding
What is the shape of CH4 and how many lone pairs does it have?
Tetrahedral, zero lone pairs.
What volume of 2M NaOH
0.05L
2KOH(aq) + H2SO4(aq) ⇌ 2H2O(l) + K2SO4(aq) Answer beginning with Keq = ____
keq = [K2SO4] / [KOH]2[H2SO4]
What is the maximum amount of electrons in the "f" orbital
14 electrons.
What explains the general trend that metals lose electrons early while nonmetals tend to gain electrons during chemical reactions?
Metals have low ionization energy, making it easy to lose, and nonmetals have more electronegativity, making it easier to gain electrons.
Are molecules with symmetrical shapes always nonpolar?
A molecule can have a symmetrical shape and still be polar if the atoms around it aren’t all the same.
What mass of NaOH (molar mass = 40g/mol) is needed to make 150 mL of a 0.75 M solution?
4.5 grams
2Al(s) + 3Cu2+ (aq) ⇌ 2Al3+(aq) + 3cu(s)
What is the electron configuration of Fe3+
1s22s22p63s23p63d5