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3 years ago

Help help help please!!

Chemistry

1 answer:

gtnhenbr [62]3 years ago

3 0

Answer:

The correct answer is D hydrogen and chlorine need to be balanced there's an equal amount of magnesium on each side. I just took the test and got the correct answer.

Explanation:

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Determine the oxidation number (oxidation state) of each element in CH 4 . C : H : Determine the oxidation number (oxidation sta

AleksandrR [38]

Answer:

1. In CH₄ molecule:

The oxidation number of H = (+ 1)

The oxidation number of C = (- 4)

2. In SO₂ molecule:

The oxidation number of O = (- 2)

the oxidation number of S = (+ 4)

3. In BF₃ molecule:

The oxidation number of F = (- 1)

the oxidation number of B = (+ 3)

Explanation:

Oxidation number represents the oxidation state of an element in a given chemical compound, which can be zero, negative or positive.

The overall charge on a given chemical molecule is equal to sum of the oxidation numbers of all the elements in that molecule.

Now, calculating the oxidation number-

1. In CH₄ molecule:

As we know, the oxidation number of H = (+ 1)

and the overall charge on the molecule = 0

Let the oxidation number of C be x

∴ x + (+ 1) × 4 = 0

⇒ x = (- 4)

Therefore, the oxidation number of C = (- 4)

2. In SO₂ molecule:

As we know, the oxidation number of O = (- 2)

and the overall charge on the molecule = 0

Let the oxidation number of S be x

∴ x + (- 2) × 2 = 0

⇒ x = (+ 4)

Therefore, the oxidation number of S = (+ 4)

3. In BF₃ molecule:

As we know, the oxidation number of F = (- 1)

and the overall charge on the molecule = 0

Let the oxidation number of B be x

∴ x + (- 1) × 3 = 0

⇒ x = (+ 3)

Therefore, the oxidation number of B = (+ 3)

3 0

4 years ago

A chemist weighed out 70.8 g of magnesium. Calculate the number of moles of magnesium she weighed out. Round your answer to sign

solniwko [45]

Answer:

2.91 grams of Magnesium

Explanation:

I put a picture . I used the molar mass of magnesium which can be calculated from the periodic table or simply google it. :) I hope it helps - Enrique

8 0

4 years ago

Read 2 more answers

An acidic solution could have a pH of A) 14 B) 10 C) 3 D) 7

Alenkinab [10]

Answer:

Option (C) 3

Explanation:

The pH scale is a scale that ranges from 0 to 14. The pH reading has various notifications. These notifications are as follow:

1. If the pH reads between 0 and 6, then the solution is acidic.

2. If the pH reads 7, then the solution is neutral.

3. If the pH reads between 8 and 14, then the solution is basic.

With the above information, option C is the correct answer to the question.

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4 years ago

The moon rises and sets every day, like the sun. Sarah noticed that the moon was sometimes visible at night and sometimes during

eimsori [14]

the answer is A.) the moon is orbiting the earth once per month

its the only logical answer, the others are either impossible or illogical

3 0

3 years ago

What is the charge of an aluminum ion? (2 points) Select one: a. 2+ b. 3+ c. 2- d. 3-

choli [55]

Answer:- b. +3

Explanations:- Charge of a metal ion is equal to the number of valence electrons it has as it loses these electrons to have its nearest noble gas like electron configuration.

Al has 3 valence electrons and being a metal it loses all of these and so the charge of Al ion is +3. It could be shown as:

$Al\rightarrow Al^+^3+3e^-$

So, the right choice is b. 3+.

6 0

3 years ago