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3 years ago

A. b. c. d. Please help I'm desperate!!!

Chemistry

2 answers:

Neko [114]3 years ago

7 0

The answer is obviously D

aleksandrvk [35]3 years ago

4 0

Answer:

The answer for this question is D

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Connectivity is an example of which type of property?

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Answer:

physical property

Explanation:

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3 years ago

Which natural occurrence is an example of a long-term environmental change?

ki77a [65]

Answer:

Tectonic plates

Explanation:

Tectonic plates shifting is long term which creates a short term Earthquake, I hope this helped.

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3 years ago

1.5 moles of Al is how many<br> atoms?

aev [14]

Answer:

<h2>9.03 × 10²³ atoms </h2>

Explanation:

The number of atoms of Al can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 1.5 × 6.02 × 10²³

We have the final answer as

<h3>9.03 × 10²³ atoms</h3>

Hope this helps you

4 0

3 years ago

At a certain temperature a 42.55% (v/v) solution of ethyl alcohol, C2H5OH, in water has a density of 0.9027 g mL-1. The density

swat32

Answer:

a. 7.187M.

b. 7.962m.

c. 0.1846

Explanation:

This solution contains 42.55mL of ethyl alcohol in 100mL of solution.

a. Molar concentration = Moles ethyl alcohol / L solution:

<em>Moles ethyl alcohol -Molar mass: 46.07g/mol-</em>

42.55mL * (0.7782g/mL) * (1mol / 46.07g) = 0.7187 moles ethyl alcohol

<em>Liters solution:</em>

100mL * (1L / 100mL) = 0.100L

Molar concentration: 0.7187mol / 0.100L = 7.187M

b. Molal concentration: Moles ethyl alcohol (0.7187moles) / kg solution

<em>kg solution:</em>

100mL * (0.9027g / mL) * (1kg / 1000g) = 0.09027kg

Molal concentration: 0.7187mol / 0.09027kg = 7.962m

c. Mole fraction: Moles ethyl alcohol / Moles ethyl alcohol + moles water

<em>Moles water: -molar mass: 18.01g/mol-</em>

Volume water = 100mL - 42.55mL = 57.45mL

57.45mL * (0.9949g/mL) * (1mol/18.01g) = 3.1736 moles water

<em>Moles fraction:</em>

0.7187 moles ethyl alcohol / 0.7187 moles ethyl alcohol+3.1736 moles water

= 0.1846

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3 years ago

How does the formation of covalent bonds relate to the octet rule?

Triss [41]

Answer:

Covalent bonding occurs when atoms share valence electrons to form a chemical bond. Atoms of nonmetals form covalent bonds by sharing electrons in order to achieve an octet of valence electrons, like the noble gases, except for helium, which only has two valence electrons. The octet refers to the highest energy s and p sublevels, the valence shell, which in noble gases, except for helium, are filled with eight electrons, two in the s sublevel and six in the p sublevel.

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3 years ago