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
Lynna [10]
2 years ago
5

What does Hess's law state can be done in order to be able to react solid magnesium with oxygen gas safely (that is, without exp

osing the magnesium to flames)?A. More moles of solid magnesium can be added until the reaction is safe.B. More moles of oxygen gas can be added until the reaction is safe.C. The reaction can be broken down and performed in steps. D. The phase state of the reactants can be changed to match each other.E. The phase state of the products can be changed to match each other.
Chemistry
1 answer:
aleksley [76]2 years ago
3 0

Answer:

C. The reaction can be broken down and performed in steps

Explanation:

Hess's Law of Constant Heat Summation states that irrespective of the number of steps followed in a reaction, the total enthalpy change for the reaction is the sum of all enthalpy changes corresponding to all the steps in the overall reaction. The implication of this law is that  the change of enthalpy in a chemical reaction is independent of the pathway between the initial and final states of the system.

To obtain MgO safely without exposing magnesium to flame, the reaction sequence shown in the image attached may be carried out. Since the enthalpy of the overall reaction is independent of the pathway between the initial and final states of the system, the sum of the enthalpy of each step yields the enthalpy of formation of MgO.

You might be interested in
The electronegativity values of carbon, hydrogen, and nitrogen are compared in the table.
Fofino [41]

Answer:

C. CH₄ is less than NH₃ because the NH bond is more polar than the CH bond

Explanation:

The intermolecular forces between ammonia is far stronger than for methane. Between the molecules of ammonia we have the presence of hydrogen bonds. This bond is absent in methane.

Hydrogen bonds are one of the strongest intermolecular forces. It is as a result of the electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom N, O and F of another molecule.

  • This strong interaction is absent in methane which has just dipole - dipole attraction.

The strength of the hydrogen bond depends on the electronegativity of the combining atoms.

5 0
3 years ago
A woman’s menstrual cycle usually lasts about 28 days T/F
Sergio039 [100]

A woman’s menstrual cycle usually lasts about 28 days *TRUE*

6 0
3 years ago
Read 2 more answers
This is a science question for k12
bixtya [17]

Height of wave - amplitude

Higher the pitch - higher the frequency

Louder - higher the amplitude

bottom of the wave - trough

distance from crest to crest - wave length

top of the wave - crest

6 0
2 years ago
Read 2 more answers
How to answer all these questions?
Fudgin [204]
You have to do it to see the results
8 0
3 years ago
What is the oxidation state of each individual carbon atom in c2o42−?
MA_775_DIABLO [31]

Answer:

+3

Explanation:

The oxygen all have a -2 oxidation state. (peroxides are exceptions)

The chemical structure is symmetrical. Both carbon are equivalent.

2 (oxidation state of carbon) + 4 (oxidation state of oxygen) = charge of ion.

2 (oxidation state of carbon) + 4 (-2) = -2

oxidation state of carbon = +3

7 0
2 years ago
Read 2 more answers
Other questions:
  • How many ml of 0.01-m naoh will be required to titrate 0.061-g of khp to it's endpoint?
    10·1 answer
  • _.
    12·1 answer
  • How many valence electrons must two atoms share to form a single covalent bond? answers A.2 B.4 C.3 D.1
    14·1 answer
  • Why Ammonia is nut dried by passing through concentrated H2SO4.​
    11·1 answer
  • What are 2 indications that a chemical change has occurred?
    12·1 answer
  • Two separate masses of zinc were measured on a laboratory balance. The first zinc had a sample mass of 210.10g, and the second z
    12·1 answer
  • El compuesto del cianuro
    5·1 answer
  • Use the following information to calculate the concentration, Ka and pka for an unknown monoprotic weak acid. (8 pts.) 20.00 mL
    9·1 answer
  • A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur.
    14·1 answer
  • A
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!