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spin [16.1K]
3 years ago
11

How have water & wind shaped Earth's Surface?

Chemistry
1 answer:
sleet_krkn [62]3 years ago
7 0

Answer:

pangea

Explanation:

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Is potassium fluoride a covalent bond or ionic bond
Ivahew [28]

It's an ionic bond! Potassium is a cation, or a metal with a positive charge, and fluoride is an anion, or a nonmetal with a negative charge.

A covalent bond is the bond between two nonmetals.

Hope this helped!

7 0
3 years ago
Read 2 more answers
Which reaction occurs spontaneously
coldgirl [10]

Answer:

Chemical Reaction

Explanation:

5 0
3 years ago
1 C8H10(l) +21/2O2(g) → 8CO2(g) + 5H2O(g), Hcomb= ? Hf for C8H10(l) = +49.0kJ/mol C8H10(l) Use the balanced combustion reaction
nikklg [1K]

Answer:

H_{comb}=-4406kJ/mol

Explanation:

Hello,

In this case, the enthalpy of combustion is understood as the energy released when one mole of fuel, in this case octene, is burned in the presence of oxygen and is computed with the enthalpies of formation of the fuel, carbon dioxide and water as shown below (oxygen is circumvented as it is a pure element):

H_{comb}=8*\Delta _fH_{CO_2}+5\Delta _fH_{H_2O}-\Delta _fH_{C_8H_{10}}

Thus, since we already know the enthalpy of combustion of the fuel, for carbon and water we have -393.5 and -241.8 kJ/mol respectively, thereby, the enthalpy of combustion turns out:

H_{comb}=8*(-393.5kJ/mol)+5(-241.8kJ/mol)-49.0kJ/mol\\\\H_{comb}=-4406kJ/mol

Best regards.

4 0
3 years ago
What volume of 18.0 m sulfuric acid is required to prepare 16.5 l of 0.126 m h2so4?
Blababa [14]

this is a dilution question where a certain volume is taken from a more concentrated solution and diluted to make a solution with a lower concentration.

the dilution forumla is as follows

c1v1 = c2v2

where c1 is concentration and v1 is volume of the more concetrated solution

c2 is concentration and v2 is volume of the diluted solution

substituting the values in the equation

18.0 M x V = 0.126 M x 16.5 L

V = 0.1155 L

volume of 115.5 mL is taken from the 18.0 M solution and diluted upto 16.5 L solution.

6 0
4 years ago
Use the dilution formula, m1v1 = m2v2, to calculate the concentration of cu+2 ions in cuvettes 1 and 2. record these concentrati
lianna [129]
<span>Answer: The dilution formula is V1M1 = V2M2. We need 3 of the values to calculate the 4th. We have the original volume (2 mL of copper ion solution) and the final volume (20 mL), but we don't have the concentration of either the original or the final copper solution, All we can say is the resulting solution is 10 times as dilute as the original was- V1M1 = V2M2 2Ă—0.200 = 20Ă—M2, so M2 = 0.400/20 = 0.020M</span>
5 0
3 years ago
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