24. The half-life of iodine-125 is 60 days. 24. The half-life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would What fraction of iodine-125 nuclides would be left after 360 days?be left after 360 days?

a. ½a. ½ b.1/256thb.1/256th c. 1/8th c. 1/8th d. 1/64th d. 1/64th

Which type(s) of nuclear reaction is Which type(s) of nuclear reaction is used in a nuclear power plant?used in a nuclear power plant?

. a. fission. a. fission b. fusionb. fusion c. both fission and fusionc. both fission and fusion d. none of thesed. none of these

What is the charge of Zn in the What is the charge of Zn in the compounds ZnClcompounds ZnCl2, 2, Zn(OH)Zn(OH)2 2 andand

ZnFZnF22

A 1+A 1+ B 2 +B 2 + C 3 +C 3 + D 4 +D 4 +

How many significant digits are in How many significant digits are in the measurement .002345the measurement .002345

A 4A 4 B 6B 6 C 5C 5 D 1D 1

Isotopes of an element differ from Isotopes of an element differ from each other by their:each other by their:

a. number of protons b.number of neutronsa. number of protons b.number of neutrons c. atomic numbersc. atomic numbers d. all of the aboved. all of the above

What are the products of the What are the products of the following reaction? following reaction?

KOH + NaCl KOH + NaCl

A ClA Cl22 and NaKOH and NaKOH

B KCl and NaOHB KCl and NaOH C NaK and HOClC NaK and HOCl D HD H22 and NaCl and NaCl

What are the products of a What are the products of a combustion reaction?combustion reaction?

A CO + energyA CO + energy B COB CO2 2 + H+ H22OO

C COC CO2 2 + H+ H22O + energyO + energy

D COD CO33 + H + H2 2

What is the molar mass of Al(OH)What is the molar mass of Al(OH)33

AA 52.3852.38

B 77.98B 77.98

C. 43.98C. 43.98

How many grams of aluminum chloride are How many grams of aluminum chloride are produced when 32.0g of Al react with an produced when 32.0g of Al react with an excess of HCl? (Hydrogen gas is the other excess of HCl? (Hydrogen gas is the other product)product)

A. 158 g of AlCl3

B. 316 g of AlCl3

C. 76.0 g of AlCl3

When aluminum metal is placed in copper(II) nitrate, a When aluminum metal is placed in copper(II) nitrate, a single replacement reaction occurs. If the solution is made single replacement reaction occurs. If the solution is made by dissolving 52.5g of copper(II) nitrate in water, and 2.7g of by dissolving 52.5g of copper(II) nitrate in water, and 2.7g of aluminum is placed in the solution:aluminum is placed in the solution:

How many grams of copper metal will be produced?How many grams of copper metal will be produced?

A. 19 g Cu

B. 9.5 g Cu

C. 18.0 g Cu

D. 18 g Cu

What volume is occupied of 5.6 g What volume is occupied of 5.6 g of Clof Cl22 gas at STP? gas at STP?

A. 1.8 LA. 1.8 L B .90 LB .90 L C 2.6 LC 2.6 L D 3.2 LD 3.2 L

A solution is made by dissolving 4.0 g A solution is made by dissolving 4.0 g of NaOH in enough water to make a of NaOH in enough water to make a

2.00 L solution. What is the molarity? 2.00 L solution. What is the molarity?

A .24 MA .24 M B .050 MB .050 M C .012 MC .012 M D .04 MD .04 M

Write the quantum that follows the following Write the quantum that follows the following 3 0 0 +1/23 0 0 +1/2

A. 3 0 0 -1/2A. 3 0 0 -1/2

B. 3 1 0 +1/2B. 3 1 0 +1/2

C. 4 0 0 +1/2 C. 4 0 0 +1/2

Select the correct electron configuration for Select the correct electron configuration for the ion, the ion, OO2-2-

a) 1sa) 1s221p1p662s2s22 b) 1sb) 1s222s2s222p2p55

c) 1sc) 1s222s2s222p2p44 d) 1sd) 1s222s2s222p2p66

Calculate the energy of a mole of atoms which Calculate the energy of a mole of atoms which emit a light which has a frequency of 6.34 x 10emit a light which has a frequency of 6.34 x 101515 hz.hz.

Remember Planck’s constant isRemember Planck’s constant is 6.626X 10 6.626X 10 -34-34 J-S J-S

a) 4.20 x 10-a) 4.20 x 10-1818 J J b) 4.20 x 10 b) 4.20 x 10-18-18 kJ kJ

c) 3.70 x 10-c) 3.70 x 10-1818 J J d) 2.53 x 10 d) 2.53 x 1066 kj kj

Consider the unbalanced equation: Na(Consider the unbalanced equation: Na(ss) + ) + ClCl22((gg) ) NaCl( NaCl(ss). What mass of NaCl can ). What mass of NaCl can

be produced from 25.0 g of Clbe produced from 25.0 g of Cl22 and excess and excess

Na?Na? A 41.2 gA 41.2 g B 82.4 gB 82.4 g C 20.0 g C 20.0 g

The destruction of ozone by chlorofluorocarbons can be The destruction of ozone by chlorofluorocarbons can be described by the following reactions:described by the following reactions:

ClO(g) + OClO(g) + O33(g) → Cl(g) + 2 O(g) → Cl(g) + 2 O22(g) (g) H°= -29.90 kJ/molH°= -29.90 kJ/mol

2 O2 O33(g) (g) →→ 3 O 3 O22(g)(g) H°= 24.18 kJ/molH°= 24.18 kJ/mol

Determine the Value of Determine the Value of H° for:H° for:

Cl(g) + OCl(g) + O33(g) → ClO(g) + O(g) → ClO(g) + O22(g)(g)

A 5.72 KJ/molA 5.72 KJ/mol

B.B. 54.08 KJ/mol54.08 KJ/mol

C.C.18.46 kJ/mol18.46 kJ/mol

What is the name of the following What is the name of the following molecule?PClmolecule?PCl55

A Phosphorous ChlorideA Phosphorous Chloride B tetraChloroPhosphorousB tetraChloroPhosphorous C Phosphorous tetrachlorideC Phosphorous tetrachloride D Phosphorous pentachloride D Phosphorous pentachloride

An ideal gas occupies a certain volume at 600. Torr An ideal gas occupies a certain volume at 600. Torr and 27 degrees C. If the pressure is reduced to and 27 degrees C. If the pressure is reduced to

500. Torr what will the temperature have to be to 500. Torr what will the temperature have to be to keep the volume constantkeep the volume constant

A. 250 CA. 250 CB. 250 KB. 250 KC. 200 CC. 200 CD. 200 KD. 200 K

What intermolecular forces are What intermolecular forces are present in Hpresent in H22

A Dipole DipoleA Dipole Dipole B IonicB Ionic C London Dispersion ForcesC London Dispersion Forces D.Hydrogen bondingD.Hydrogen bonding

What is the name of the following What is the name of the following compound? Nacompound? Na22CrOCrO44

A. Sodium ChlorideA. Sodium Chloride B. Sodium CarbonateB. Sodium Carbonate C Sodium ChromateC Sodium Chromate D sodiumdicarbonatetetraoxideD sodiumdicarbonatetetraoxide

What is the name of the family that What is the name of the family that includes Fluorine, Chlorine and includes Fluorine, Chlorine and

Bromine?Bromine?

. a. Halogens. a. Halogens b. Alkaline metalsb. Alkaline metals c. Alkali metalsc. Alkali metalsd. Alkaline earth metalsd. Alkaline earth metals

What is the final temperature of a What is the final temperature of a system prepared by placing a 100.0 system prepared by placing a 100.0

g sample of hot copper metal g sample of hot copper metal originally at 98.8 C into 100.0 0 g of originally at 98.8 C into 100.0 0 g of

water at 25.0 degrees C?water at 25.0 degrees C?

A. 20.1 degrees CA. 20.1 degrees C B 45.1 degrees CB 45.1 degrees C C 31.2 degrees CC 31.2 degrees C

A compound contains .52g of A compound contains .52g of Phosphorous and .67g of Oxygen. Phosphorous and .67g of Oxygen.

What is the empirical formula?What is the empirical formula? A. POA. PO B. PB. P33OO66

C. PC. P44OO88

D. D. PP22OO55

What is the empirical formula of the What is the empirical formula of the compound that contains 3.10 g P compound that contains 3.10 g P

and 10.64 g Cl?and 10.64 g Cl? A. PClA. PCl33 B. PClB. PCl C. PC. P22ClCl55

S(s) + OS(s) + O22 > SO > SO22(g) (g) ΔΔH -296kJ/molH -296kJ/mol

How much heat is released when How much heat is released when 275 g of Sulfur is burned in excess 275 g of Sulfur is burned in excess

of oxygen?of oxygen?A. 2.54 X 10 3 KJA. 2.54 X 10 3 KJB. 2.00 X 10 3 KJB. 2.00 X 10 3 KJC. 5.45 X 10 3 KJC. 5.45 X 10 3 KJ

Predict the products and write the Predict the products and write the equation for the following:equation for the following:

Solid Copper reacts with aqueous silver Solid Copper reacts with aqueous silver NitrateNitrate

Draw the lewis dot structure for Draw the lewis dot structure for NHNH44ClCl

Draw the lewis dot structure for SODraw the lewis dot structure for SO44 2-2-