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inessss [21]
4 years ago
13

230 in scientific notation

Chemistry
1 answer:
rewona [7]4 years ago
7 0
230 in scientific notation is:

2.3 x 10^2
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Calculate the volume of 817.5g of CH4 at STP.
Sedbober [7]

Answer:

The volume is 1143,78 L

Explanation:

We use the formula PV=nRT. The conditions STP are 1 atm of pressure and 273K of temperature. We calculate the weight of 1 mol of CH4.

Weight 1 mol CH4= weight C+ (weight H)x4= 12 g + 1 g x4= 16 g/mol

16 g----1 mol CH4

817,5g--x=(817,5gx1 mol CH4)/16g= 51, 1 mol CH4

PV=nRT V=(nRT)/P  

V= (51,1 mol x 0,082 l atm/K mol x 273 K)/1 atm

V= 1143,78 liters

4 0
3 years ago
Fossils of the reptile Mesosaurus were found in western Africa and eastern South America. Which statement might such findings su
pashok25 [27]
C. Remember Pangea, the two continents were one right next to each other
 

5 0
3 years ago
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A solution of a base differs from a solution of an acid in that the solution of a base?A. is able to conduct electricity B. is a
Anon25 [30]

Answer:

  • <u><em>Option D. has a great [OH⁻]</em></u>

Explanation:

1) Both <em>acids</em> and <em>bases</em> ionize in aqueous solutions so they are able to <em>conduct electricity</em>.

The ions, being charged particles, when flow through the solution are charge carriers, then they conduct electricity.

So, the option A does not state a difference between a solution of a base and a solution of an acid.

2) Both acids and bases are able to cause an <em>indicator color change</em>.

The usufulness of the indicators is that they are able to change of color when the pH changes either from acid to basic or from basic to acid. There are different indicators because none is suitable for the whole range of pH, but the statement B is not how solutions of base and acids differ.

3) The model of Arrhenius for acids and bases states that an acid is a substance that ionizes in water releasing H⁺ ions (this is equivalent to H₃O⁺) and a base is a substance that releases OH⁻ ions in water. Then, acids have a greater concentration of H₃O⁺ (so option C is not true for a solution of a base) and bases  have a greater concentraion of OH⁻, making the option D. true.

8 0
3 years ago
Why can carbon bond to many elements simultaneously? because its +4 valence forms ionic bonds because it has a natural ionic cha
mina [271]
<span>Because it is capable of forming multiple covalent bonds. I hope 15 hours isn't too late to answer your question.

</span>
6 0
4 years ago
Read 2 more answers
Q#1 Give a combination of four quantum numbers that could be assigned to an electron occupying a 5p orbital.
Gnesinka [82]

Answer:

For an electron in 5p orbital

5,1,-1,+1/2

For an electron in 6d orbital

6,2,-2,+1/2

Explanation:

The term quantum numbers refers to a set of values that can be used to determine the region in space where it is likely to find an electron. This region in space where there is a high probability of finding an electron is known as an atomic orbital. An atomic orbital is actually a wave function according to the Schrödinger wave equation.

There are four quantum numbers used in describing an atomic orbital: the principal quantum number (n), the orbital angular momentum quantum number also called azimuthal or subsidiary quantum number (l), the magnetic quantum number (ml), and the electron spin quantum number (ms).

For a 5p orbital;

n= 5, l= 1, ml= -1,0,1 ms= +1/2 or -1/2

For 6d orbital;

n= 6, l= 2, ml= -2,-1,0,1,2, ms= +1/2 or -1/2

Since we are requested to use a four quantum number description that can be assigned to an electron in these levels;

For an electron in 5p orbital

5,1,-1,+1/2

For an electron in 6d orbital

6,2,-2,+1/2

3 0
3 years ago
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