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4 years ago

Why is water considered a polar molecule?

2 answers:

7 0

B because The slight negative charge near the oxygen atom attracts nearby hydrogen atoms from water or positive-charged regions of other molecules.

SSSSS [86.1K]4 years ago

7 0

The answer is B The oxygen atom attracts the hydrogen atoms. They work together, i just did this one.

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In one compound of nitrogen and oxygen, 0.615 grams of nitrogen combines with 0.703 grams of oxygen. In another 1.27 grams of ni

Orlov [11]

Answer:

Answer in explanation

Explanation:

In the first case, we divide each of the masses by the respective atomic masses:

N =0.615/14 = 0.043928571428571

O = 0.703/16 = 0.0439375

It can be seen here that the values are similar, hence the formula is NO

now let us look at the second data set:

N = 1.27/14 = 0.090714285714286

O = 2.9/16 = 0.18125

We now divide by the smallest

N = 090714285714286/090714285714286 = 1

O = 0.18125/090714285714286 = 2

The formula here is thus NO2.

It can be seen that there are different oxides of nitrogen here which clearly indicates the law of multiple proportion.

4 0

4 years ago

(a) Find the concentration of electrons and holes in a sample of germanium that has a concentration of donor atoms equal to 1015

matrenka [14]

Answer:

a) Germanium = 5.76 x 〖10〗^11 〖cm〗^(-3) , Semiconductor is n-type.

b) Silicon = 2.25 x 〖10〗^5 〖cm〗^(-3) , Semiconductor is n-type.

For clear view of the answers: Please refer to calculation 5 in the attachments section.

Explanation:

So, in order to find out the concentration of holes and electrons in a sample of germanium and silicon which have the concentration of donor atoms equals to 〖10〗^15 〖cm〗^(-3). We first need to find out the intrinsic carrier concentration of silicon and germanium at room temperature (T= 300K).

Here is the formula to calculate intrinsic carrier concentration: For calculation please refer to calculation 1:

So, till now we have calculated the intrinsic carrier concentration for germanium and silicon. Now, in this question we have been given donor concentration (N_d) (N subscript d), but if donor concentration is much greater than the intrinsic concentration then we can write: Please refer to calculation 2.

So, now we have got the concentration of electrons in both germanium and silicon. Now, we have to find out the concentration of holes in germanium and silicon (p_o). (p subscript o)

Equation to find out hole concentration: Please refer to calculation 3. and Calculation 4. in the attachment section.

Good Luck Everyone! Hope you will understand.

6 0

3 years ago

You have a spot of oil, which is nonpolar, on your favorite shirt. in which substance will the oil be most likely dissolve?

Natalija [7]

In concentrated soap solution.

7 0

4 years ago

Read 2 more answers

I need to know this because I was absent and he was going and could not help me with it so I am on my own

valkas [14]

Aw, I hope I can help.

1) C
(A meter stick is the only form of measurement that measures distance)

2) C
(other metric units all correspond with other forms of measurement)

3/4) I can’t measure the line physically from my phone but I think you’d be alright!

5) B
(a triple beam balance measures mass!)

6) B
(corresponds with triple beam balance)

7) A: 34.5g B: 104.3g C: 132.5g

8) C

9) A
(a graduated cylinder is the only form of measurement that measures volume)

10) A
(corresponds with a graduated cylinder!)

6 0

4 years ago

Read 2 more answers

Is raindrop a solid or gas

Annette [7]

Neither a raindrop is a liquid just like water

4 0

4 years ago