chemistry quiz need help?

B

bob1

Active member
hi im confused i haved try these problems 2 times and got the wrong can u guys give me explanitantions for these problems pls so in the future i can do them ty

When heat flows from the system to the surroundings
Student ResponseValueFeedback
A.we define the flow of energy as negative and call it EXOTHERMIC
B.we define the flow of energy as positive and call it EXOTHERMIC
C.we define the flow of energy as negative and call it ENDOTHERMIC
D.we define the flow of energy as positive and call it ENDOTHERMIC


Which of the following is true about the properties of DH?
Student ResponseValueFeedback
A.if a reaction is reversed, the sign of DH remains the same
B.DH is the same for any amount of reactants.
C.DH is directly proportional to the amount of reactants.


If DH for the reaction A + 2B -> C is +30 kJ/mol
What is DH for the reaction C -> A + 2B?
Student ResponseValueFeedback
A.+60 kJ/mol
B.-60 kJ/mol
C.+30 kJ/mol
D.-30 kJ/mol
E.we do not have enough information to determine this.

If DH for the reaction A + 2B -> C is +30 kJ/mol
What is DH for the reaction if you have ½ mol A and 1 mol B?
Student ResponseValueFeedback
A.+15 kJ/mol
B.+30 kJ/mol
C.-30 kJ/mol
D.-15 kJ/mol
E.we do not have enough information to determine this.
 
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