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
Daniel [21]
3 years ago
12

How is energy involved in chemical and physical changes?

Chemistry
1 answer:
lys-0071 [83]3 years ago
7 0
Chemical changes within matter always use energy; physical changes sometimes use energy, though they use much less energy than chemical changes. Physical changes use energy to change the physical state of a substance. Chemical changes either release or absorb energy when changing a substance into a completely new one.
You might be interested in
Which of the following chemical formulas contains the most molecules?
maw [93]
C. 2Fe2O3 would be the correct answer!
4 0
3 years ago
The rate constant of a reaction is 5.8 × 10−3 s−1 at 25°c, and the activation energy is 33.6 kj/mol. what is k at 75°c? enter yo
sergij07 [2.7K]

Answer:

k₂ = 4.06 x 10⁻² s⁻¹.

Explanation:

  • From Arrhenius law: <em>K = Ae(-Ea/RT)</em>

where, K is the rate constant of the reaction.

A is the Arrhenius factor.

Ea is the activation energy.

R is the general gas constant.

T is the temperature.

  • At different temperatures:

<em>ln(k₂/k₁) = Ea/R [(T₂-T₁)/(T₁T₂)]</em>

k₁ = 5.8 × 10⁻³ s⁻¹, k₂ = ??? , Ea = 33600 J/mol, R = 8.314 J/mol.K, T₁ = 298.0 K, T₂ = 348.0 K.

  • ln(k₂/5.8 × 10⁻³ s⁻¹) = (33600 J/mol / 8.314 J/mol.K) [(348.0 K - 298.0 K) / (298.0 K x 348.0 K)] = (4041.37) (4.82 x 10⁻⁴) = 1.9479.
  • Taking exponential of both sides:

(k₂/5.8 × 10⁻³ s⁻¹) = 7.014.

∴ k₂ = 4.06 x 10⁻² s⁻¹.

3 0
3 years ago
Question
lyudmila [28]
C — all others endanger you.
3 0
3 years ago
Read 2 more answers
I need help.... I wasn't taught this, I was sick and she doesn't do anything to help me!
Ghella [55]

Answer:

The answer to your question is:

52.- E, A, D, B, C, F

53.- D, B, F, C, A, E

Explanation:

52.- Gamma, Ultraviolet, Blue, Red, Infrared, Microwaves

53.- X-ray, ultraviolet, green, orange, infrared, radio

4 0
3 years ago
Describe the ammonium ion, NH4+, and the sulfate ion, SO42-. What compounds would these ions form with potassium and fluoride io
rjkz [21]

Explanation:

Ammonium Fluoride and Potassium Sulphate

3 0
3 years ago
Other questions:
  • 6 - 7 if you can. I will give brainliest
    14·2 answers
  • How could energy conservation help to control or decrease air, water, and land pollution?
    9·1 answer
  • Robert was able to travel 166.0 miles in 4.000 hours and used 39 liters of gasoline. What was Robert's speed in feet per second?
    9·1 answer
  • How does increasing the mass affect the kinetic and potential energy of a pendulum?
    10·1 answer
  • List things that determine thermal energy
    7·1 answer
  • Oxidation-reduction is often the most confusing and abstract part of chemistry for first-time chemistry students. Is it really w
    7·1 answer
  • Which body systems are involved in the removal of waste
    5·1 answer
  • For a particular reaction, ΔH° is 34.2 kJ and ΔS is 99.2 J/K. Assuming these values change very little with temperature, over wh
    6·2 answers
  • A student tests a solid sample of a compound and determines that it does not conduct electric
    7·1 answer
  • What phrase is defined as distance over time for a given period?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!