April 19, 2014

Homework Help: IB Chemistry

Posted by chirikamo on Thursday, February 28, 2013 at 11:57pm.

Which statements are correct for an endothermic reaction?
I. The system absorbs heat.
II. The enthalpy change is positive.
III. The bond enthalpy total for the reactants is greater than for the products.
A. I and II only B. I and III only
C. II and III only D. I, II and III
The answer is A but I don't understand Why D is not correct

2) Which combination of ionic charge and ionic radius give the largest lattice enthalpy for an ionic
Ionic charge Ionic radius
A. high large
B. high small
C. low small
D. low large
The answer is D but Why B is not correct
Please help me,,thank you so much

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