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MArishka [77]
3 years ago
12

A substance made of two or more elements that have been chemically combined is a(n) ______.

Chemistry
2 answers:
RideAnS [48]3 years ago
5 0
Compound (for example: H2O)
Anvisha [2.4K]3 years ago
3 0

Answer: Compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements. Example: Fe

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example: CaCO_3

Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material. Example: Sugar solution

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Ibuprofen is a drug used to manage mild pain, fever, and inflammation. It is a chiral drug, and only the S enantiomer, whose spe
madam [21]

Answer:

Specific Rotation = 105º

S% in mixture = 92%

Explanation:

Specific rotation in organic compounds varies linearly, then the enantiomeric excess can be express as:

e.e. = \frac{\alpha }{\alpha pure}

Where alpha is the specific rotation of the mixture and alpha pure is the specific rotation of the excess enantiomer.

Then, knowing that the S enantiomer is in excess you can calculate the specific rotation of that mixture:

84=\frac{\alpha }{125.0}*100

\alpha =105 Degrees

For calculating the percentage of S you should remember that the enantiometric excess is the percentage of excess of a certain enantiomer, for example in this case:

84 = S-R

Since S is in Excess

Also, it is true:

100=S+R

Then you can solve the system of linear equations, finding:

8=R\\92=S

Hope it helps!

4 0
3 years ago
A standard room temperature and pressure, most of the elements on the periodic table are
Maslowich

Answer:

Solids

Explanation:

At standard room temperature and pressure, most of the elements are solids.

Just a few of the elements are liquids and gases at this temperature.

The periodic table is made up of metals, metalloids and non-metals. Most of these substances are actually solid.

Some non-metals are gaseous at standard room temperature.

8 0
3 years ago
Which two locations are MOST probable for locating the cloud of electrons?
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4 years ago
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A rigid tank contains 2.4 kg of helium at determine the volume
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The volume is 1.3 for
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What properties must a solid have to undergo sublimation
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Sublimation occurs in solids with vapor pressures that exceed atmospheric pressure at or near room temperature.

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