*will mark brainliest and give 40 points* * be fully detailed *

the diagram shows the potential energy changes for a reaction pathway.

a curve line graph is shown. the y axis of the graph has the title potential energy. the x axis of the graph has the title reaction pathway. the curve begins at a lower level and ends at a slightly higher level. a vertical line labeled a, starts from the x axis till the beginning of the graph line. a vertical line labeled b starts from the x axis and continues till the peak of the graph. another vertical line labeled c is shown from the x axis till the point where the curve ends.

part 1: does the diagram illustrate an endothermic or an exothermic reaction? give reasons in support of your answer.

part 2: describe how you can determine the total change in enthalpy and activation energy from the diagram and if each is positive or negative.

Part 1: The diagram shows an endothermic reaction.

Part 2: To find total change in enthalpy do C minus A  It will be positive. To find activation energy subtract B minus A. It will be positive.

Explanation:

Part 1: Endothermic. In the diagram A represents the reactants and C represents the products. An endothermic reaction absorbs energy, meaning it has more energy at the end than at the beginning. C is higher up on the diagram than A and represents more energy, while also representing the result of the reaction.

Part 2: To find total change in enthalpy do C minus A (or products minus reactants). It will be positive because C is a greater value than A. To find activation energy subtract B minus A because this will give you the difference between the peak of the curve and A. It will be positive because B is a greater value than A.

the atomic mass is the bottom number on the element.

-steel jelly

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.