Chemistry

1)During an endothermic reaction, total energy
A. decreases.
B. increases.
C. stays the same.
D. cannot be determined.

2)The enthalpy of formation of an element is
A. negative.
B. positive.
C. zero.
D. negative or positive, depending on which element.

i think number 1 is A
for number 2 i marked C on my test, but i have mixed feelings that it could be D can you please help
Thank you

  1. 👍 0
  2. 👎 0
  3. 👁 210
  1. 2 is C for sure.
    #1 is not that easy I don't think. The question asks about total energy but provides only the fact it is endothermic. Endothermic tells you that the reaction absorbs heat from the surroundings in order to occur. It doesn't say anything about the total energy; i.e., nothing about delta S for you to calculate delta G.

    1. 👍 0
    2. 👎 0
  2. I believe that the answer to 1 is C because, according to the first law of thermodynamics, energy can be converted from one form to another but is neither created nor destroyed. So, the total energy of the universe would remain the same even if the system's energy decreases and the surrounding's energy increases. 2 is C.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What

  2. Algebra

    How are the variables related on the graph? A. As speed decreases, height stays constant B. As speed deceases , height increases C. As speed increases , height decreases D. As speed increases , height increases

  3. Science

    PLEASE CHECK MY ANSWERS------------------------------------------------- An object falls through the air, gaining speed as it falls. A student claims that this creates new energy, and so it breaks the law of conservation of

  4. social studies

    How does opportunity cost affect people's wants and needs? A. It changes the supply and demand of goods. B. It requires them to make a choice. C. It requires them to be producers and consumers. D. Opportunity cost does not impact

  1. math

    Which statement about the function y = -1/4x− 2 is true? 1)As the value of x increases, the value of y increases. 2)As the value of x decreases, the value of y stays the same. 3)As the value of x increases, the value of y

  2. Science(Stuff to do like with magnets!)

    1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next??? A. its potential energy decreases. B. Its potential energy increases. C. Its potential energy stays the

  3. Algebra 1

    What is the end behavior of the graph of f(x) = -0.25x^2 - 2x + 1? A) As x increases, f(x) increases. As x decreases, f(x) decreases. *** B) As x increases, f(x) decreases. As x decreases, f(x) decreases. C) As x increases, f(x)

  4. social studies

    when supply decreases and demand increases what happens to the price of a good? a it increases b it stays the same c it decreases d it is unaffected

  1. Chemistry

    Which of the following reactions is exothermic? 1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- --> Cl-1 My guess is 4, but I'm not sure Here is what you do. For 1, do we think it will take energy to

  2. Math help please

    1. The ordered pairs (0, 1), (1, 4), (2, 16), (3, 64), and (4, 256) represent a function. What is a rule that represents this function? y = 4^x y = 4x y = x^4 y = x + 4 2. Consider the relationship between the height of a tree and

  3. chemistry

    For which of the reactions listed below will Gibbs free energy always be negative? A. An exothermic reaction that increases in entropy B. An endothermic reaction that decreases in entropy C. An endothermic reaction that increases

  4. algebra 1

    What is the end behavior of the graph of f(x) = -0.25x2 - 2x + 1? A) As x increases, f(x) increases. As x decreases, f(x) decreases. B) As x increases, f(x) decreases. As x decreases, f(x) decreases. C) As x increases, f(x)

You can view more similar questions or ask a new question.