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3 years ago

Help Asap plz Thx giving lots of points!!!

Chemistry

1 answer:

3241004551 [841]3 years ago

3 0

29. B) A population changes in response to a change in the environment.

Evolution is the process by which new species of organisms develop from earlier forms. Most often, in response to a change in a species environment. It's the frequent change of the alleles in a population.

30. A) Describes the relationship between an organism and its environment

Darwin made this theory of evolution by natural selection as an explanation for adaptation. Darwin defined natural selection as the

"principle by which each slight variation, if useful, is preserved."

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Which example best demonstrates Charles’s law?

Liono4ka [1.6K]

Answer:

Explanation:

The Charles law states that the volume of an ideal gas increases when temperature is increased under constant pressure. The pressure inside the balloon is always equal to the atmospheric pressure. Therefore answer A demonstrate the Charles law.

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4 years ago

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you see a structural formula and which the symbols for elements are connected by a long Dash you can assume that the chemical bo

sergejj [24]

When you see a long dash joining two elements in the structural formula of a chemical molecule you can assume that the chemical bonds in the compound are simple bonds.

In the representation of chemical molecules long dashes are used to represent simple bonds since these bonds are longer than double and triple bonds, which are represented by = and ≡ respectively.

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4 years ago

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Which notation designates a possible value for a principal energy level in an atom?

Nata [24]

Answer:

Explanation:

There are four quantum numbers:

Principal quantum number (n)

Azimuthal quantum number (l)

Magnetic quantum number (ml)

Principal quantum number (n)

It tell about the energy levels. It is designated by n.

For example,

If n =2

It means there are two energy level present.

Azimuthal quantum number (l)

The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3. For l=3

(n-1)

4-1 = 3

it means principle quantum is 4 and electron is present in f subshell.

Magnetic quantum number (ml)

It describe the orientation of orbitals. Its values are -l to +l. For l=3 the ml will be -3 -2 -1 0 +1 +2 +3.

Spin quantum number (ms)

The spin quantum number tells the spin of electron either its clock wise (+1/2) or anti clock wise (-1/2).

If the electron is added in full empty orbital its spin will be +1/2 because it occupy full empty. If electron is already present and another electron is added then its spin will be -1/2.

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3 years ago

The reaction described in part a required 3.77 l of magnesium chloride. what is the concentration of this magnesium chloride sol

katrin [286]

Assuming you are talking about the atomic mass of magnesium chloride
M = n/V
M = 1/3.77
M = .265

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3 years ago

Benzene (c6h6) burns in air to produce co2 and liquid water. calculate heat released in kj per gram of the compound reacted with

liubo4ka [24]

Answer:Heat released in kilo Joule per gram of benzene when reacted with oxygen is 0.628 kJ/g.

Explanation:

The standard enthalpy of formation of benzene is 49.04 kJ/mol. Same amount of energy will be released on combustion of 1 mol of benzene.