please help!!
i’m trying to go to sleep

Answer:

black??

Explanation:

All the water on the earth is the same water that has been here since

All the water on the planet is the identical water that has been here since Penguins preen their feathers continually.

Feathers must be defended in prime condition to provide insulation and waterproofing.

Penguins groom with their bills. A gland around the bottom of the tail secretes oil that the penguin distributes throughout its feathers.

Penguins preen for several minutes in the water by stroking their bodies with their flippers while turning and twisting.

Penguins preen to maintain their feathers in head circumstances and are waterproof. On a well-groomed penguin, moisture rarely touches the skin.

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Answer:

1 kPa = 760/101.325 = 7.5 mmHg; atm = atmosphere; kPa = kilo Pascal; mmHg = millimetres of mercury.

Answer:

5,000

Explanation:

ed2021

Answer:

1.7x10²³ Fluorine atoms are present

Explanation:

To solve this question we must know that, to find the amount of atoms of a substance from its mass, we have, as first, to convert this mass to moles using molar mass of the substance. With the moles we can find the amount of molecules using Avogadro's number. And with the formula we can know the atoms presents:

Moles Fluorine (F₂, Molar mass: 37.997g/mol)

5.3g * (1mol / 37.997g) = 0.139 moles F₂

Molecules F₂:

0.139 moles F₂ * (6.022x10²³molecules / mol) = 8.4x10²² molecules F₂

As 1 molecule of F₂ contains 2 atoms of Fluorine:

8.4x10²² molecules F₂ * 2 =

Explanation:

The particles of matter are continuously in motion due to which tehy collide with each other, and this creates a vibration in the solids

I hope it is correct ☺️

Answer:

As the level of carbon dioxide in the blood increases, more H+ is produced and the pH decreases. This increase in carbon dioxide and subsequent decrease in pH reduce the affinity of hemoglobin for oxygen. The oxygen dissociates from the Hb molecule, shifting the oxygen dissociation curve to the right.

Answer:

Globular clusters are densely packed collections of ancient stars. Roughly spherical in shape, they contain hundreds of thousands, and sometimes millions, of stars. Studying them helps astronomers estimate the age of the universe or figure out where the center of a galaxy lies.

Explanation:

Answer:

Explanation:

The answer should be .00500M

The molarity of the solution is = 5.12M

The molarity of a solution is the measures the number of moles of a solute per liter of a solution.

Molarity = moles solute/Liter solution

Molar mass of sodium (Na) = 23g

Molar mass of chlorine (Cl) = 35.5g

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

To calculate the quantity of moles in 150g of NaCl,

1mol = 58.5g

xmol = 150g

Cross multiply,

xmol= 150×1/58.5

= 2.56mol

To convert 500mL to Liters,

500/1000 = 0.5 Liters

Substituting into the equation, Molarity = moles solute/Liter solution

Molarity= 2.56/ 0.5 = 5.12M

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Answer:

15 km/hour

Explanation:

You need to find how fast he was going per hour.

Answer: 15

Divide. 60 ÷ 4

This gives us 15. So, Alex was going 15 mph

Answer:

[tex]\lambda=6.56x10^{-7}m[/tex]

Explanation:

Hello there!

In this case, it possible to use the Rydberg equation in order to calculate the wavelength for this transition from n=3 to n=2 as shown below:

[tex]\frac{1}{\lambda} =R_H(\frac{1}{n_f^2}-\frac{1}{n_i^2} )[/tex]

Thus, we plug in the corresponding energy levels and the Rydberg constant to obtain:

[tex]\frac{1}{\lambda} =10973731.6m^{-1}(\frac{1}{2^2}-\frac{1}{3^2} )\\\\\frac{1}{\lambda} =1524129.4m^{-1}\\\\\lambda=\frac{1}{1524129.4m^{-1}} \\\\\lambda=6.56x10^{-7}m[/tex]

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Answer:

700

Explanation:

How to find

Multiply the volume and pressure and divide the product by the temperature and the molar gas constant to calculate the moles of the hydrogen gas.

Solve: 204.83 × 27.88 / 8.76 = 651.901872146

Which is 651.90

In the nearest hundredths, the moles of gas is 700

Answer : Normally all molecular motions seizes at 0k which is -272oC so the temperature can't go below that

Explanation:

But, the rocks cracked because of too much expansion. Generally at night, water can be found within rocks which then evaporates during the day. And when water is cold or freezed it expands. So, as the water in the rock expands it causes an increase in size until a certain level where it can no more expand, it cracks.What causes the split of the rock is due to the expansion of water as it freezes

Answer:The answer is B

Explanation:

Answer:

the answer to this is 74 :)

In order to solve this, you will need to know how many moles of CaCl2 you will need, and to do so, you must look at the concentration of the solution.

You are told that the concentration of the solution is 0.19M, meaning that there is 0.19 moles of CaCl2 for every 1 liter of solution. However, you don't have 1 liter of solution, you have 445.2 mL. You must convert this to liters by dividing by 1000.

445.2 mL *  (1 L / 1000 mL) = 0.4452 L

Now, you can solve for how many moles the solution must have. Since M = mol / L and you are given M and L, you can set up an equality as follows:

0.19M = mol / 0.4452 L

Now, in order to find the number of moles, you multiply both sides by 0.4452L

0.19M * 0.4452 L = moles = 0.084588mol  

Now, you must calculate the molar mass of CaCl2 by using the periodic table

MM Ca = 40.078 g/mol

MM Cl = 35.452 g/mol

40.078 + (35.452 * 2) = 110.982 g/mol

Now you multiply the number of moles in the solution you calculated by the molar mass.

0.084588mol * 110.982 g/mol = 9.387 g CaCl2

Answer:

12

Explanation:

pOH = -log(1.0 x 10^-2) = 2

pH = 14 - pOH

pH = 14 - 2 = 12

Answer:

So you can make it longer by putting in some redstone. And this will give you a potion that will last for 4 minutes. Alright we're done it's got 4 minute slow falling potions.

Explanation:

Answer:

Ok, to make a slow falling potion, you need 1 water bottle, 1 nether wart, and 1 fantom membrane.

Explanation:

hope I could help, lmk if I did!

Answer:

Hydrogen + Helium

Explanation:

No reaction occurs

Answer:

[tex]\boxed {\boxed {\sf molarity \approx 0.722 \ M \ HCl}}[/tex]

Explanation:

Molarity is the concentration measurement equal to moles per liter.

[tex]molarity=\frac{moles}{liters}[/tex]

We have 26.0 grams of HCl and 1.00 liters of water. We must convert grams of HCl to moles.

To convert from grams to moles, the molar mass is used. Usually we find these values on the Periodic Table, but they are already provided. The molar mass of hydrochloric acid is 36.0 grams per mole. Use this number as a ratio.

[tex]\frac {36.0 \ g \ HCl}{ 1 \ mol \ HCl}[/tex]

Multiply by the given number of grams: 26.0

[tex]26.0 \ g \ HCl *\frac {36.0 \ g \ HCl}{ 1 \ mol \ HCl}[/tex]

Flip the ratio so the grams of hydrochloric acid cancel.

[tex]26.0 \ g \ HCl *\frac {1 \ mol \ HCl}{ 36.0 \ g \ HCl}[/tex]

[tex]26.0 *\frac {1 \ mol \ HCl}{ 36.0 }[/tex]

[tex]\frac {26.0}{ 36.0 } \ mol \ HCl = 0.72222222222 \ mol \ HCl[/tex]

Now we know the moles and liters.

Substitute these values into the molarity formula.

[tex]molarity = \frac {0.72222222222 \ mol \ HCl}{1.00 \ L }[/tex]

[tex]molarity = 0.72222222222 \ mol \ HCl/L[/tex]

The original measurements of grams and liters have 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.

The 2 tells us to leave the 2 in the thousandth place.

[tex]molarity \approx 0.722 \ mol \ HCl/ L[/tex]

1 mole per liter is equal to 1 molar, or M. Change the units.

[tex]molarity \approx 0.722 \ M \ HCl[/tex]

The molarity of this solution is approximately 0.722 M HCl

Among all the given options, option d is correct options. Fossil fuels developed from the organic remnants of ancient plants and animals.

Fossil fuels are vital natural resources, as is widely known. They provide significant benefits to humanity, and we depend on them for energy. However, using fossil fuels has drawbacks as well.

Fossil fuels developed from the organic remnants of ancient plants and animals. The heat and pressure of the crust caused Earth to transform these million-year-old leftovers into fuels that include carbon.

The need for energy only increased after the Industrial Revolution. Similar to that, these fuels have had the ability to generate enormous amounts of energy to meet this need.

Therefore, the correct option is option D.

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Answer:

Practical significance refers to the magnitude of the difference, which is known as the effect size. Results are practically significant when the difference is large enough to be meaningful in real life. ... Very small differences will be statistically significant with a very large sample size.

Explanation:

Hope it helps

FOLLOW MY ACCOUNT PLS PLS

Answer:

i am doing this in science also i would like to know if u know

Explanation:

Answer:

B. 0.92 M

Explanation:

Molarity of a solution = number of moles (n) ÷ volume (V)

According to the information provided in this question;

mass of NaCl = 42g

Volume of water = 780mL

Using mole = mass/molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mole = 42/58.5

mole (n) = 0.72mol

Volume (V) = 780 mL = 780/1000 = 0.780 L

Hence, molarity = n/V

Molarity = 0.72/0.780

Molarity = 0.923 M

Answer:

2.3 grams per cubic cm

Explanation:

Density is equal to mass over volume, so

23/10=2.3

Answer:

0.02 g/ml

Explanation:

si dividimos 10 con 500, es decir, 10/500, obtenemos 0.02. Las unidades serán g / ml.

Answer:

2Ag + CaCl2

Explanation:

https://en.intl.chemicalaid.com/tools/equationbalancer.php?equation=Ca+%2B+AgCl+%3D+Ag+%2B+CaCl2 use that website for chemistry

Answer:

[tex]\%P/P_{hierro}=41.1\%\\\\\%P/P_{arena}=24.4\%\\\\\%P/P_{cobre}=30.8\%\\\\\%P/P_{aluminio}=0.6\%[/tex]

Explanation:

¡Hola!

En este caso, dado que estamos tratando con problem sobre porcentaje peso/peso de hierro, arena, cobre y aluminio, primero debemos calcular la masa inicial de estos dos primeros en la mezcla original de acuerdo con:

[tex]m_{hierro}=300g*0.60=180g\\\\m_{arena}=300*0.40=120g[/tex]

Ahora si podemos calcular la masa de la mezcla final como la suma de las masas de todos los constituyentes de la mezcla:

[tex]m_T=180g+120g+135g+2.77g=437.77g[/tex]

Finalmente, podemos calcular los porcentajes P/P como se muestra a continuación:

[tex]\%P/P_{hierro}=\frac{180g}{437.77g} *100\%=41.1\%\\\\\%P/P_{arena}=\frac{120g}{437.77g} *100\%=24.4\%\\\\\%P/P_{cobre}=\frac{135g}{437.77g} *100\%=30.8\%\\\\\%P/P_{aluminio}=\frac{g}{437.77g} *100\%=0.6\%[/tex]

¡Saludos!