1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Svet_ta [14]
3 years ago
14

In an exothermic reaction, the potential energy of the products is lower than that of the reactants. Which of the following is a

lso true for an exothermic reaction?
the enthalpy change is negative
it requires a catalyst to take place
energy is absorbed from the surroundings
the kinetic energy of the products is also lower

Chemistry
2 answers:
mixer [17]3 years ago
7 0

Answer: the enthalpy change is negative

Explanation:

Endothermic reactions are defined as the reactions in which potential energy of the product is greater than the potential energy of the reactants. The total energy is absorbed in the form of heat and \Delta H for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which potential energy of the product is lesser than the potential energy of the reactants. The total energy is released in the form of heat and \Delta H for the reaction comes out to be negative.

MatroZZZ [7]3 years ago
3 0
The enthalpy change is negative. The other statements are false because: Can take place without a catalyst Energy is given out to the surroundings. Kinetic energy of products is higher.
You might be interested in
Which compound reacts with a base in the bicarbonate buffer system in the human body? Carbon dioxide carbonic acid bicarbonate i
denis23 [38]

Bicarbonate buffer system in blood consists of carbonic acid and bicarbonate ion. H2CO3/HCO3-

When a base enters the body the acid part of the buffer reacts with the base.

Thats the carbonic acid (H2CO3) reacts with the base.    

8 0
3 years ago
Read 2 more answers
How many moles are in 2.5L of 1.75 M Na2CO3
mixas84 [53]

Answer: There are 4.375 moles in 2.5 L of 1.75 M Na_2CO_3

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}      

Molarity of solution = 1.75 M

Volume of solution = 2.5 L  

Putting values in equation , we get:

1.75M=\frac{\text{Moles of} Na_2CO_3}{2.5L}\\\\\text{Moles of }Na_2CO_3=1.75mol/L\times 2.5L=4.375mol

6 0
2 years ago
John rings a doorbell.
Kamila [148]

Answer:

<u>Yes</u>

Explanation:

Remember, <u>Newton's third law of motion;</u> which says in part that <em>"Every action has an equal and opposite reaction."</em>

Hence, in this case, the fact that the doorbell rang out implies that there was another force that was exerted on it; which is, John's finger pressing the doorbell.

In other words, when John uses his fingers to press the doorbell button he applies a force (a mechanical force), and that force results in an opposite reaction; the ringing of the doorbell.

6 0
3 years ago
the atomic number of barium is 56 what do you know about the subatomic particles in an atom of this element
Reptile [31]

Answer is 56 protons and 56 electrons.

<em>Explanation;</em>

Atomic number is equal to number of protons. Hence, when the atomic number is 56, it means that atom has 56 protons.

When the element is in neutral state, number of protons = number of electrons. Hence, we can say that barium atom has 56 electrons.

But same element can have different number of neutrons. Those are called isotopes. Hence, we cannot say that there are 56 neutrons in barium atom without having its mass number. (Mass number = number of protons + number of neutrons)

4 0
3 years ago
Read 2 more answers
Choose all the answers that apply.
Lady_Fox [76]
It is softer than topaz and and it is softer than diamond (diamond has a Mohs hardness of 10, which is the highest value of the scale)
7 0
3 years ago
Read 2 more answers
Other questions:
  • If 2 molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product, then what is the represe
    7·1 answer
  • A student mixes two liquids together - 10 grams of alcohol and 25 grams of water. Which substance is the solute?
    5·2 answers
  • What is the difference between breccia rock and conglomerate rock
    15·1 answer
  • What is (-1.7588 × 10^11 C/Kg)(1.309 × 10^-15 Kg)
    10·1 answer
  • How do we turn petroleum into energy we use?
    13·1 answer
  • 238 U 92 is an isotope notation. what is the atomic number, mass number, number of protons, and number of neutrons?
    6·1 answer
  • What dose science do
    14·2 answers
  • What is the Lewis dot diagram structure for PI2F
    13·1 answer
  • Except for speed, your nervous system is most similar to
    12·1 answer
  • What are 5 examples of monosaccharides? What is also known as monosaccharide?​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!