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3 years ago

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Which of the following would most likely cause a building to erode? A. acid rain B. the heat island effect C. heat pollution D.

vehicle emissions

1 answer:

Elena L [17]3 years ago

3 0

Yeah it should be acid rain

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Isotopes of an element will {always, sometimes, or never) have the same number of protons.

dusya [7]

Answer:

Isotopes of an element will ALWAYS have the same number of protons.

Explanation:

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3 years ago

Explain how changes in pressure affect the rate and yield of ammonia produced

vesna_86 [32]

Answer:

If the pressure is increased, the equilibrium position moves to the right, so the yield of ammonia increases. The rate of reaction also increases because the gas molecules are closer together, so successful collisions are more frequent.

Explanation:

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3 years ago

What volume and mass of steam at 100. °C and 1.00 atm would release the same amount of energy during condensation as 100. cm^3 o

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3 years ago

Which statement is true of a chemical change?

Feliz [49]

Answer:

A is the answer. Chemical changes happen when atomic bonds are broken or created during chemical reactions. Hence, in this case, it involve changes to molecular structure.

- Change in states are physical changes.

- When salts are dissolved in water, you can use Distillation to separate them. Distillation is a physical change as well.

- Dissolving is just physical change.

Explanation:

The statement that is true of a chemical change among the statements given in the question is "It involves changes in the molecular structure". The correct option among all the options that are given in the question is the first option or option "A". I hope the answer has actually come to your help.

6 0

3 years ago

dentify the oxidation state of Cl in Cl 2 O 7 . +2 Identify the oxidation state of Cl in AlCl − 4 . +1 Identify the oxidation st

konstantin123 [22]

Answer:

<u>1. +7</u>

<u>2. -1</u>

<u>3. +3</u>

<u>4. +5</u>

Explanation:

<em><u>1. Identify the oxidation state of Cl in Cl₂O₇ . </u></em>

Cl₂O₇ is a neutral compound.

In a neutral compound the oxidation states add up 0.

The oxidation state of oxygen in all the binary compounds, except the peroxides (where two oxygen atoms are bonded together and with other elements) is -2.

Since there are 7 atoms of O, the total oxidation number from it is (-2) × 7 = -14.

Then, the oxidation number from the Cl atoms must add up +14 (because the compound is neutral).

Since there are two atoms of Cl each one must contribute with +14/2 = +7 to the oxidation number.

That is the oxidation state of Cl in the compound. The answer is +7.

<u><em>2 Identify the oxidation state of Cl in AlCl ₄⁻ (the formula was corrected)</em></u>

The most common oxidation state of Al is +3.

Since the net charge of the ion is -1, the oxidation number of the other atom (call it x) must be such that four times it and +3 add up -1:

4x + 3 = - 1

4x = -1 - 3

4x = - 4

x = - 1

In conclusion, the oxidation state of Cl in the ion is -1

<u><em>3. Identify the oxidation state of Cl in Ba (ClO₂)₂ . </em></u>

This is a neutral compound. Thus the overall oxidation number is 0.

The oxidation state of Barium, Ba, such as of the other members of the group 2, alkaline earth metals, is +2.

The oxydation state of oxygen, O, in ternary compounds is -2

Thus, calling x the oxidation state of Cl and taking in account the number of atoms in the compound:

+2 + 2x + 4(-2) = 0

2x + 2 - 8 = 0

2x = 6

x = +3

Therefore, the oxidation state of Cl in this compound is +3

<u><em>4. Identify the oxidation state of Cl in ClF₄⁺</em></u>

Fluor has oxidation state -1. Since there are four atoms, it contributes with 4 × (-1) = - 4

The overall charge of the ion is +1.

Thus, the oxidation state of Cl, x, is:

x - 4 = 1

x = 1 + 4

x = +5

Hence, the oxidation state of Cl in this ion is +5.

6 0

3 years ago

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