 24. The half-life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360 days?  a. ½b.1/256thc. 1/8th d. 1/64th

Which type(s) of nuclear reaction is used in a nuclear power plant? . a. fissionb. fusion  c. both fission and fusiond. none of these

What is the charge of Zn in the compounds ZnCl 2, Zn(OH) 2 and ZnF 2  A 1+  B 2 +  C 3 +  D 4 +

How many significant digits are in the measurement  A 4  B 6  C 5  D 1

Isotopes of an element differ from each other by their:  a. number of protons b.number of neutrons  c. atomic numbersd. all of the above

What are the products of the following reaction? KOH + NaCl  A Cl 2 and NaKOH  B KCl and NaOH  C NaK and HOCl  D H 2 and NaCl

What are the products of a combustion reaction?  A CO + energy  B CO 2 + H 2 O  C CO 2 + H 2 O + energy  D CO 3 + H 2

 What is the molar mass of Al(OH) 3 A B C

How many grams of aluminum chloride are produced when 32.0g of Al react with an excess of HCl? (Hydrogen gas is the other product) How many grams of aluminum chloride are produced when 32.0g of Al react with an excess of HCl? (Hydrogen gas is the other 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 single replacement reaction occurs. If the solution is made by dissolving 52.5g of copper(II) nitrate in water, and 2.7g of aluminum is placed in the solution:  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 of Cl 2 gas at STP?  A. 1.8 L  B.90 L  C 2.6 L  D 3.2 L

A solution is made by dissolving 4.0 g of NaOH in enough water to make a 2.00 L solution. What is the molarity?  A.24 M  B.050 M  C.012 M  D.04 M

 Write the quantum that follows the following /2  A /2 B /2 B /2 C /2 C /2

 Select the correct electron configuration for the ion, O 2-  a) 1s 2 1p 6 2s 2 b) 1s 2 2s 2 2p 5  c) 1s 2 2s 2 2p 4 d) 1s 2 2s 2 2p 6

 Calculate the energy of a mole of atoms which emit a light which has a frequency of 6.34 x hz.  Remember Planck’s constant is  6.626X J-S a) 4.20 x J b) 4.20 x kJ c) 3.70 x J d) 2.53 x 10 6 kj c) 3.70 x J d) 2.53 x 10 6 kj

 Consider the unbalanced equation: Na(s) + Cl 2 (g)  NaCl(s). What mass of NaCl can be produced from 25.0 g of Cl 2 and excess Na?  A 41.2 g  B 82.4 g  C 20.0 g

The destruction of ozone by chlorofluorocarbons can be described by the following reactions: ClO(g) + O 3 (g) → Cl(g) + 2 O 2 (g) H°= kJ/mol 2 O 3 (g) → 3 O 2 (g)H°= kJ/mol Determine the Value of H° for: Cl(g) + O 3 (g) → ClO(g) + O 2 (g) A 5.72 KJ/mol B KJ/mol C kJ/mol

What is the name of the following molecule?PCl 5  A Phosphorous Chloride  B tetraChloroPhosphorous  C Phosphorous tetrachloride  D Phosphorous pentachloride

An ideal gas occupies a certain volume at 600. Torr and 27 degrees C. If the pressure is reduced to 500. Torr what will the temperature have to be to keep the volume constant  A. 250 C B. 250 K C. 200 C D. 200 K

What intermolecular forces are present in H 2  A Dipole Dipole  B Ionic  C London Dispersion Forces  D.Hydrogen bonding

What is the name of the following compound? Na 2 CrO 4  A. Sodium Chloride  B. Sodium Carbonate  C Sodium Chromate  D sodiumdicarbonatetetraoxide

What is the name of the family that includes Fluorine, Chlorine and Bromine? . a. Halogensb. Alkaline metals  c. Alkali metalsd. Alkaline earth metals

What is the final temperature of a system prepared by placing a g sample of hot copper metal originally at 98.8 C into g of water at 25.0 degrees C?  A degrees C  B 45.1 degrees C  C 31.2 degrees C

A compound contains.52g of Phosphorous and.67g of Oxygen. What is the empirical formula?  A. PO  B. P 3 O 6  C. P 4 O 8  D. P 2 O 5

What is the empirical formula of the compound that contains 3.10 g P and g Cl?  A. PCl 3  B. PCl  C. P 2 Cl 5

S(s) + O 2 > SO 2 (g) ΔH -296kJ/mol How much heat is released when 275 g of Sulfur is burned in excess of oxygen? A X 10 3 KJ B X 10 3 KJ C X 10 3 KJ

Predict the products and write the equation for the following:  Solid Copper reacts with aqueous silver Nitrate

Draw the lewis dot structure for NH 4 Cl

Draw the lewis dot structure for SO 4 2-