Predict whether ΔS for each reaction would be greater than zero, less than zero, or too close to zero to decide.
ΔS > 0; ΔS < 0; too close to decide
I2(g) + Cl2(g) > 2ICl(g)
2NOBr(g) > 2NO(g) + Br2(g)
CO2(g) + H2(g) > CO(g) + H2O(g)
2H2O2(I) > 2H2O(I) + O2(g)

a) : too close to decide.

b) : > 0.

c) : too close to decide.

d)  : > 0.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

For the reaction:

a)

In this reaction 2 moles of gaseous reactants are converting to 2 moles of gaseous products. Thus is too close to decide.

b)  

In this reaction 2 moles gaseous reactants is getting converted to 3 moles of gaseous products. Thus the randomness will increase and hence entropy will also increase.Thus > 0.

c)

In this reaction 2 moles of gaseous reactants are converting to 2 moles of gaseous products. Thus is too close to decide.

d)  

In this reaction 2 moles liquid reactants is getting converted to 2 moles of liquid and 1 mole of gaseous products. Thus the randomness will increase and hence entropy will also increase.Thus > 0.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.