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
compound?
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

IB Chemistry - DrBob222, Friday, March 1, 2013 at 12:11am
1. I is true; II is true: what do you think of III?

2. Higher charge and smaller radius gives higher lattice energy.
IB Chemistry - chirikamo, Friday, March 1, 2013 at 1:08am
I based on the formular to calculate enthalpy change is equal to the bond enthalpy total for the reactants subtracting from the bond enthalpy for products.Hence,if the reaction is endothermic,then the bond enthalpy total for the reactants is greater than for the products

Answer this Question

Related Questions

Chemistry - 1. The delta Hf of an element in its standard state is defined to be...
chemistry kinetics - Statement-I : For an endothermic reaction, the activation ...
Chemistry - 1. A bottle of juice at room temperature is placed in a bucket of ...
Chemistry - Consider the gold-platinum system which has a value of delta w of -...
Chemistry - Consider the gold-platinum system which has a value of delta w of -...
Chemistry - Which of the following is the best definition of Hess' Law? A. ...
Chemistry - Someone said, "Calculate the total delta H of the reaction and ...
Chemistry - Someone said, "Calculate the total delta H of the reaction and...
Chemistry - Which of the following is the best definition of Hess' Law? A. ...
Chemistry - Which of the following is the best definition of Hess' Law? A. ...

For Further Reading

First Name:
School Subject:
Answer: