The number 4.6300 X 10The number 4.6300 X 1033 has how has how many significant digits? many significant digits? A. 3A. 3 B. 4 B. 4 C. 5C. 5 D. 6D. 6

When 81.3 cm is subtracted from 42.3 When 81.3 cm is subtracted from 42.3 meters, the answer that has the correct meters, the answer that has the correct number of significant digits is:number of significant digits is:

A. 4148.7 cmA. 4148.7 cm B. 4149 cmC. 41.49 mB. 4149 cmC. 41.49 m

The correct name of the compound PThe correct name of the compound P22OO55 is : is :

A. diphosphorus oxideA. diphosphorus oxide B. phosphorus B. phosphorus pentoxide;pentoxide;

C. phosphorus(V)oxide  C. phosphorus(V)oxide  D. diphosphorus pentoxideD. diphosphorus pentoxide

The correct name of the compound MnOThe correct name of the compound MnO22 is: is:

A. manganese(II)oxideA. manganese(II)oxide B. manganese B. manganese dioxide dioxide 

C. manganese(IV)oxide D. manganese oxideC. manganese(IV)oxide D. manganese oxide

How many moles are present in 608 grams How many moles are present in 608 grams of Naof Na22COCO33??

A.A.1.00 moles1.00 moles B. 5.74 moles;B. 5.74 moles; C. 608 moles C. 608 moles 

D. 3.45 X 10D. 3.45 X 102424 moles moles

When 50.0 grams of manganese oxide When 50.0 grams of manganese oxide were decomposed, it was found to have were decomposed, it was found to have 34.8 grams of manganese and 15.2 34.8 grams of manganese and 15.2 grams of oxygen. What is the grams of oxygen. What is the empirical empirical formulaformula of this compound? of this compound?

A. MnO; A. MnO; B. MnOB. MnO22 C. MnC. Mn22OO33 D. D.

MnMn33OO22

How many moles of HHow many moles of H22SOSO44 are contained in 3.5 L are contained in 3.5 L

of a 6.5 M solution?of a 6.5 M solution?

A. 1.86 moles; A. 1.86 moles; B. 3.5 moles B. 3.5 moles  C. 6.5 C. 6.5 moles moles 

D. 23 molesD. 23 moles

1. If 3.0 moles of aluminum metal are 1. If 3.0 moles of aluminum metal are reacted with an excess of iron(III) oxide, reacted with an excess of iron(III) oxide, how many moles of iron metal will be how many moles of iron metal will be produced?produced?

a. 3.0 molesa. 3.0 moles b. 2.0 molesb. 2.0 moles c. 1.5 molesc. 1.5 moles d. 1.0 molesd. 1.0 moles

The following data was obtained in the The following data was obtained in the copper lab. copper lab.

Mass of copper initially: 0.51 gMass of copper initially: 0.51 g Mass of empty beaker: 35.70 gMass of empty beaker: 35.70 g Mass of beaker and copper ppt: 36.16 gMass of beaker and copper ppt: 36.16 g Calculate the Calculate the percent yieldpercent yield in this in this

experiment. experiment. Calculate the percent error in this Calculate the percent error in this

experimentexperiment

Write the net ionic equation for the Write the net ionic equation for the following reactionfollowing reaction

Lead (II) nitrate solution is mixed with Lead (II) nitrate solution is mixed with sodium chloride solution sodium chloride solution