Structures
An atom of strontium-90 contains...
__ electrons, __ protons, __ neutrons
38 electrons, 38 protons, 52 neutrons
What element type is potassium?
Alkali Metal
What are the Bronsted-Lowry bases in this reaction?
NH3(aq) + H2O(aq) <-> NH4+(aq) + OH-(aq)
NH3 and OH-
What is the atomic number for an ion that has a charge of +1 and contains 19 electrons?
20
What element has the highest electronegativity?
Fluorine
What kind of reaction is this?
HCl(aq) + RbOH(aq) -> H2O(l) + RbCl(aq)
Acid-Base Neutralization
How many lone pairs are on the central atom of ClF3?
2
Alkaline earth metals form what charge as ions?
+2 ions.
What is the oxidation number of chlorine in NaClO2
+3
What is the molecular geometry of CO32-?
Trigonal Planar
Arrange the elements Li, Ne, Na, and Ar in increasing order of first ionization energy.
Na<Li<Ar<Ne
What is the ΔHrxn for CO(g) + 1/2O2(g) -> CO2(g)
C(s) + O2(g) -> CO2(g) ΔHrxn=-394 kJ/mol
2C(s) + O2(g) -> 2CO(g) ΔHrxn=-221 kJ/mol
-284 kJ/mol
Which of the following molecules has a 120o bond angle?
CO2, NH3, IF3, SO3
SO3
Arrange the species F-, Mg2+, and Na+, in order of decreasing size.
F->Na+>Mg2+
Use the enthalpies of formation, ΔHof, in the table to determine ΔH for this reaction.
2C2H2(g) + 5O2(g) -> 4CO2(g) + 2H2O(g)
ΔHof kJ/mol
C2H2(g) = 227
H2O(g) = -242
CO2(g) = -393
-2510 kJ/mol