When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
is halved.
has its sign changed.
is unchanged.

The correct answer is " is halved and has its sign changed".

Explanation:

I had to find the chemical equation that the statement refers to.

When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and its sign changes. This is because in the global equation only one CaO molecule is used, while in the semi-reaction the enthalpy change for two CaO molecules is given, so the enthalpy change must be divided by 2. Also, the sign changes because in the globular equation the inverse reaction of the one shown in the semi-reaction is produced, in this way we have that the CaO is on the side of the reagents and in the semi-reaction it is on the side of the products.

Have a nice day!

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)