Please Help!! Chemistry question.

Posted on 2014-11-20 07:07:00 in Chemistry by ADAM

1) For the reaction: 2Al2O3 (s) --> 4Al(s) + 3O2(g) If 4 moles of aluminum oxide is reacted completely, how many moles of oxygen gas would be formed?

3 moles

4 moles

6 moles

12 moles

2) What is the principal energy level of the valence electrons for this element: 1s22s22p4

1

2

4

6

3)What process is represented by this equation: 2NaCl(s) + heat --> 2Na(s) + Cl2(g)

dissociation

a chemical reaction

a physical change

melting

4) Given the reaction: M + 2H2O --> M(OH)2 + H2 the metal represented by M is most likely from group

1

2

3

13

5)What is the mole ratio between KI and F2 in the balanced equation below? 2KF + I2 --> 2KI + F2

1 : 1

1 : 2

2 : 1

2 : 2

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