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3 years ago

9

An unknown element, X, is a nonmetal that contains seven valence electrons. Element X most likely forms ___________ covalent bon

ds.
A) 1
B) 2
C) 3
D) 4

1 answer:

scZoUnD [109]3 years ago

4 0

A) 1 is the correct answer!

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You need to make 200ml of a 2% agarose gel in a buffer solution (1x tae) how many grams of agarose do you need?

garri49 [273]

The number of grams of agarose that you need to make 200 ml of 2% agarose gel is  4 grams

calculation
number of grams is calculated using M/v x100 =% m/v formula
  M (mass) =?
V(volume) = 200 ml
%(M/V) = 2%

convert the 2 % M/V into fraction = 2/100

then substitute the values into the equation

= M/200 ml = 2/100

multiply both side by 200

M is therefore = 2/100 x200

M=4 grams

3 0

3 years ago

In a closed container with a fixed volume, when the temperature of a gas doubles, the pressure of the gas is?

nevsk [136]

Answer:

The pressure of the gas is:

<u>Doubled</u>

<u></u>

Explanation:

Byole's Law = Pressure of fixed amount of gas is inversely proportional to Volume at constant temperature.

PV = k = constant

P1V1 = P2V2

<u>Charle's Law: </u> The volume of ideal gas at fixed pressure is directly proportional to Pressure.

V/T = constant

V1/T1 = V2/T2

On combinig the charles and byole's law , we get:

$\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}$

Now , According to question :

V2 = V1

T2 = 2(T1)

We have to find the relation between the pressure :

insert the value in the equation

$\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}$

$\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{1}}{2T_{1}}$

V1 and V1 & T1 and T1 cancels each other,

So we get

P2 = 2 P1

So the new pressure is double of the original pressure

3 0

3 years ago

A typical volume leaving the large intestine might be 140 mL. If the volume exiting the large intestine were 364 mL, then it wou

RUDIKE [14]

If the volume exiting the large intestine were 364 mL, then it would most likely indicate a case of diarrhea. This condition may lead to dehydration.

<h3>Diarrhea: causes and diagnosis</h3>

Diarrhea is an unhealthy condition that occurs when the body excretes an excessive amount of water.

Diarrhea must be treated because this condition can lead to dehydration (it may even lead to death in severe cases).

Both diarrhea and vomiting may lead to the loss of body fluids.

Learn more about diarrhea dehydration here:

brainly.com/question/10268680

6 0

3 years ago

What are the two ways we can get the mass of an object?

Anni [7]

Explanation:

divide the objects weight by the acceleration of gravity to find the mass

7 0

4 years ago

Express the concentration of a 0.0320 M aqueous solution of fluoride, F−, in mass percentage and in parts per million (ppm). Ass

denis23 [38]

Answer:

607 ppm

Explanation:

In this case we can start with the <u>ppm formula</u>:

$ppm=\frac{mg~of~solute}{Litters~of~solution}$

If we have a solution of <u>0.0320 M</u>, we can say that in 1 L we have 0.032 mol of $F^-$ , because the molarity formula is:

$M=\frac{mol}{L}$

In other words:

$0.0320~M=\frac{mol}{1~L}$

$mol=0.032~M*1~L=0.032~mol$

$1~L~of~Solution=0.0320~mol~of~solute$

If we use the <u>atomic mass</u> of $F$ (19 g/mol) we can convert from mol to g:

$0.0320~mol~F^-\frac{19~g~F^-}{1~mol~F^-}~=~0.607~g$

Now we can <u>convert from g to mg</u> (1 g= 1000 mg), so:

$0.607~g\frac{1000~mg}{1~g}=607~mg$

Finally we can <u>divide by 1 L</u> to find the ppm:

$ppm=\frac{607~mg}{1~L}=~607~ppm$

<u>We will have a concentration of 607 ppm.</u>

I hope it helps!

4 0

4 years ago