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
Soloha48 [4]
3 years ago
15

Chemistry questions below! (●'◡'●)

Chemistry
1 answer:
bearhunter [10]3 years ago
4 0

(1) Islands are always surrounded by bodies of water, in this case oceans. These islands tend to have more 'stable climates' and 'smaller temperature fluctuations' due to the specific heat of water, which is quite high, 4180 J/kg C. The higher the specific heat, the more the energy needed to raise the temperature of the substance. Land requires less energy to raise it's temperature than water due to it's lower specific heat. Thus, islands tend to have more stable temperatures than regions surrounded by land.

(2) Based on the conditions provided, the thermochemical equation for the reaction should be:  

<u>2NaHCO₃ (s) ---> Na₂CO₃ (s) + H₂O (g) + O₂ (g)</u>

This is a decomposition reaction, as it explains that the baking soda breaks down into the products. All we had left to do is balance the equation, adding 2 as the coefficient of the reactant.

(3) Let's rewrite the given equations:

First chemical reaction: H₂(g) + F₂(g)  ---> 2HF(g), ΔH₁ = –537 kJ.

Second chemical reaction: C(s) + 2F₂(g) ---> CF₄(g), ΔH₂ = –680 kJ

Third chemical reaction: 2C(s) + 2H₂(g) ---> C₂H₄(g), ΔH₃ = +52.3 kJ.

Fourth chemical reaction: C₂H₄(g) + 6F₂(g) ---> 2CF₄(g) + 4HF(g), ΔH₄ = ?

Now the 'fourth chemical reaction' is the one in which we need to determine the enthalpy:

ΔH₄ = 2(ΔH₁) + 2(ΔH₂) - ΔH₃,

ΔH₄ = 2(–537) + 2(–680) - 52.3 =<u> -2486.3 kJ</u>

You might be interested in
Hydroxyl radicals react with and eliminate many atmospheric pollutants. However, the hydroxyl radical does not clean up everythi
Nesterboy [21]

Answer:

ΔHreaction = 263.15 kJ/mol

Explanation:

The reaction is as follow:

OH + CF₂Cl₂ → HOF + CFCl₂

You need to calculate the enthalpy of reaction and for this it is necessary to know the standard enthalpies for each of the compounds. These enthalpies are as follows and can be found in your textbook or on the Internet.

ΔHreaction = ∑ΔHproducts - ∑ΔHreactants

delta(H)_{reaction} =((1*(-97.8)+(1*(-92))-((1*39)+(1*(-491.15))=263.15kJ/mol

7 0
3 years ago
Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular the
Nutka1998 [239]
Boyle's law which plays a major role in the kinetic-theory states that Volume and Pressure are inversely proportional 
4 0
3 years ago
Read 2 more answers
What is the width of this penny?
sergey [27]

Answer:

D. 1.2 cm

Explanation:

1st, determine the units. We see that our ruler is in cm.

This rules out A and C.

2nd, determine answer.

We see that the penny extends past 1 and ends at 0.2.

So, the total is 1.2 cm.

3 0
3 years ago
2. Explain what an isotope is and give two important physical properties of isotopes that make them useful in biological researc
katrin [286]

Answer:

<h2>isotope is a variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.All isotopes of a given element have the same number of protons but different number of neutrons in each atom.</h2>

<h2>The 2 important physical properties of isotope is</h2>

<h2>1.<u>M</u><u>e</u><u>l</u><u>t</u><u>i</u><u>n</u><u>g</u><u> </u><u>Points</u></h2><h2>2.<u>B</u><u>o</u><u>i</u><u>l</u><u>i</u><u>n</u><u>g</u><u> </u><u>Points</u></h2>
8 0
3 years ago
1. Caused by movement of rocks<br>below the surface. is Called?​
valentina_108 [34]
I don’t know what to do with the answer I don’t know how you feel sorry I didn’t
3 0
3 years ago
Other questions:
  • Iven the parent compound, draw the mass spectrum fragment that is observed at m/z 77. include any hydrogen atoms and the charge.
    12·1 answer
  • According to the Kinetic Molecular Theory, as the volume of a gas increases: the number of particle impacts per unit area increa
    14·2 answers
  • Predict the ground-state electron configuration of the following ions. Write your answers in abbreviated form, that is, beginnin
    12·1 answer
  • The periodic table tells you how many grams are in a mole of atoms of any
    11·1 answer
  • In the Arrhenius equation, temperature is directly proportional to which factor
    5·1 answer
  • What are sodium salts of long-chain fatty acids called?
    6·2 answers
  • How far does light travel in 4 days
    7·1 answer
  • What are 3 physical changes in a paper
    5·2 answers
  • Once a slide is prepared and placed onto the microscope, the magnification and focus need to be altered. Describe how to change
    5·2 answers
  • What ions are formed when naoh is dissolved in water?.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!