Molarity
What is the molarity of a solution with 2 moles of NaCl dissolved in 1 liter of water?
2 M
What type of bond has a shared pair of electrons?
Covalent bond
In a periodic table, what do you call it when you move left to right across the table?
period
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 electron configuration of beryllium (Be)
1s2 2s2
You dissolve 0.5 moles of Helium in 2 liters of water, What is the molarity of the solution?
0.25 M
How many valence electrons are used in CH4?
What is the name of the first group on the periodic table?
alkali metal
How does concentration affect reaction?
Increasing concentration makes the reaction faster because there are more particles colliding
what are the four types of orbitals?
s, p, d, f
How many moles of kBr are needed to make 500mL of a 1.5 M solution?
0.75 moles
How many lone pairs are in NH3?
1 lone pair
What is the most electronegative element in the periodic table?
fluorine
N2(g) + 3H2(g) ⇌ 2NH3(g) What happens to the equilibrium if more H2 is added?
Shift right
What is the noble gas configuration of Xenon (Xe)
[Kr] 5s24d10
What volume of 2M NaOH
0.05L
What is the shape of CH4 and how many lone pairs does it have?
Tetrahedral, zero lone pairs
Why does the atomic radius decrease when going down a group
shielding
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" orital
14 electrons
What mass of NaOH (molar mass = 40g/mol) is needed to make 150 mL of a 0.75 M solution?
4.5 grams
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 explains the general trend that metals lose electrons early while nonmetals tend to gain electrons during chemical reactions?
Answer: Metals have low ionization energy, making it easy to lose, and nonmetals have more electronegativity, making it easier to gain electrons
2Al(s) + 3Cu2+(aq) ⇌ 2Al3+(aq) + 3Cu(s) Answer beginning with keq = ____
Keq = [Al3+]2 / [Cu2+]3
1s22s22p63s23p63d5