An icecube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone

Considering the definition of STP conditions and Avogadro's Number, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 5.25×10²² molecules are contained in how many moles of methane?

amount of moles of methane= (5.25×10²² molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of methane= 0.087165 moles

There are 0.087165 moles of methane in 5.25×10²² molecules.

You can apply the following rule of three: if by definition of STP conditions 1 mole of methane occupies a volume of 22.4 liters, 0.087165 moles occupies how much volume?

volume= (0.087165 moles× 22.4 L)÷1 mole

volume= 1.952496 L

Finally, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

Learn more about STP and Avogadro's number:

https://brainly.com/question/14107547

https://brainly.com/question/1117525

#SPJ1

Explanation:

Chromatography is a physical method of separation that distributes components to separate between two phases, one stationary (stationary phase), the other (the mobile phase) moving in a definite direction. The mobile phase is the phase that moves in a definite direction

Air is mixture.

But pure air compound .

Explanation:

So the answer is Compound.

Please Mark As Brain list

The person ABC weighs 65 kg, with 11.5 kg attributed to fat deposits. This individual has embarked on a hunger strike, and we will explore their potential survival time without food and water, as well as without food but with water.

The human body requires a constant intake of nutrients and fluids to sustain vital functions. When it comes to survival without food and water, the timeline can vary depending on individual factors such as age, health condition, and body composition.

Generally, a person can survive for about three weeks without food, but only a few days without water. In the case of ABC, which weighs 65 kg, 11.5 kg of which is fat, the body would initially rely on stored glycogen for energy. Once glycogen stores are depleted, the body enters a state of ketosis, utilizing fat stores for energy. However, fat stores alone cannot sustain long-term survival without food or water.

Without water, the body would dehydrate rapidly, leading to severe complications and potentially death within a matter of days. On the other hand, if ABC consumes water but abstains from food, survival time could be extended.

Water intake helps maintain hydration and supports vital bodily functions. However, without a source of energy from food, the body would eventually exhaust its fat stores, leading to muscle breakdown and potential organ failure. The survival timeline without food but with water can vary, but it would generally be a matter of weeks rather than months.

Learn more about glycogen here:

https://brainly.com/question/31488365

#SPJ11

this is the answer to ur question hope is helpful

The molar solubility of MH(OH)2 in a 0.10 M solution of Mg(NO2)2 is 3.4 × 10^-6 M.

Molar solubility is defined as the number of moles of solute that are dissolved per liter of a solution. It is represented by the symbol 's.'Molar solubility can be expressed in moles per liter or in molarity. Here, we have a 0.10 M solution of Mg(NO2)2. It means that the concentration of Mg(NO2)2 is 0.10 M.

We will write the balanced equation of the dissociation of MH(OH)2.

The equation is: MH(OH)2 (s) ↔ Mg2+ (aq) + 2OH- (aq)

We can see that 1 mole of MH(OH)2 produces 2 moles of OH-.

Hence, the concentration of OH- ions will be 2s (where 's' is the molar solubility of MH(OH)2).

We know that the concentration of Mg(NO2)2 is 0.10 M.

It means that the concentration of Mg2+ ions is also 0.10 M.

Now, we will write the expression for Ksp of MH(OH)2. Ksp is the solubility product constant.

The expression is: Ksp = [Mg2+][OH-]2Ksp is a constant value that is calculated using the solubility of the compound. In this case, we do not have the solubility of MH(OH)2.

We need to use the concentrations of the ions and the Ksp value to calculate the solubility of MH(OH)2. We will substitute the values in the expression and solve for 's.'

Ksp = [Mg2+][OH-]2Ksp = (0.10)(2s)2Ksp = 0.4s2

Now, we will solve for 's.'s = √(Ksp/0.4)s = √(4.5 × 10^-12/0.4)s = 3.4 × 10^-6 M

Therefore, the molar solubility of MH(OH)2 in a 0.10 M solution of Mg(NO2)2 is 3.4 × 10^-6 M.

To know more about molar solubility refer to:

https://brainly.com/question/28202068

#SPJ11

The term that best describes highly methylated and condensed DNA is "heterochromatin."

In the nucleus of eukaryotic cells, DNA is organized into two main forms: euchromatin and heterochromatin. Heterochromatin is characterized by its dense and compact structure, which makes it inaccessible for transcription factors and other proteins involved in gene expression. Methylation of DNA occurs when a methyl group is added to the DNA molecule, usually at specific regions called CpG islands.

Methylation plays a crucial role in gene regulation and can lead to gene silencing by preventing the binding of transcription factors to the DNA. Therefore, highly methylated and condensed DNA is typically associated with reduced gene activity and limited access to the underlying genetic information.

For more information on heterochromatin visit: brainly.com/question/30394937

#SPJ11

To create a 1 L 5 M solution of LiBr in the lab, 434.23 g of LiBr would need to be dissolved in enough water to bring the final volume to 1 L.


To create a 1 L 5 M solution of LiBr, the following steps would need to be taken:
1. Determine the molar mass of LiBr: Li has a molar mass of 6.941 g/mol, and Br has a molar mass of 79.904 g/mol. Therefore, the molar mass of LiBr is 6.941 + 79.904 = 86.845 g/mol.
2. Calculate the mass of LiBr needed: To make a 5 M solution, we need 5 moles of LiBr per liter. Therefore, we need 5 x 86.845 g of LiBr per liter, or 434.23 g/L. Since we only want to make 1 L of solution, we need 434.23 g of LiBr.
3. Dissolve LiBr in water: Using a balance, measure out 434.23 g of LiBr and dissolve it in enough water to bring the final volume to 1 L. Mix the solution well until all the LiBr has dissolved.
4. Verify the concentration: Use a concentration meter or titration to confirm that the concentration of the solution is indeed 5 M.

Learn more about concentration here:

https://brainly.com/question/10725862

#SPJ11

The mass percentage of carbon in the compound is approximately 56.8%.

To get the mass percentage of carbon in the compound, we need to determine the mass of carbon and then calculate what percentage of the total mass is carbon.

As We know that 16.9 mg of CO2 is produced from 8.10 mg of the compound, which means that all of the carbon in the original sample has been converted to CO2.

The molar mass of CO2 is 44.01 g/mol, which means that 1 mole of CO2 has a mass of 44.01 grams.

From this, we can calculate the number of moles of CO2 produced:

16.9 mg CO2 * (1 g / 1000 mg) * (1 mol CO2 / 44.01 g) = 0.000383 mol CO2

As each mole of CO2 contains one mole of carbon, we know that the number of moles of carbon in the original sample is also 0.000383. The molar mass of carbon is 12.01 g/mol, so we can calculate the mass of carbon in the original sample:

0.000383 mol C * 12.01 g/mol = 0.0046 g C

Now, we can calculate the mass percentage of carbon in the original sample:

(mass of carbon / total mass of sample) * 100% = (0.0046 g / 0.00810 g) * 100% = 56.8%

hence, the mass percentage of carbon in the compound is approximately 56.8%.

Learn more about Mass percentage:

https://brainly.com/question/16885872

#SPJ4

Answer:

30 atm

Explanation:

Initial Volume, V1 = 3L

Initial Pressure, P1 = 100 atm

Final Volume V2 = 10 L

Final Pressure, P2 = ?

These quantities are related by the Boyle's law equation which is given as;

V1P1 = V2P2

P2 = V1 * P1  /  V2

P2 = 3 * 100 / 10

P2 = 30 atm

The study of chemicals is called chemistry.

The correct answer is 30 atm.

The ideal gas law is stated as the equation of the state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions, although it has several limitations.

The data given in the question is as follows:-

We have to find the final Pressure, To solve this question the formula is used as follows:-

\(V_1P_1 = V_2P_2\\\P_2 = \frac{V_1 * P_1 }{V_2}\)

\(P_2 = \frac{3 * 100}{ 10}\\P_2 = 30 atm\).

Hence, the correct answer is 30 atm.

For more information, refer to the link;-

https://brainly.com/question/14698383

Answer:

Take the measuring cylinder and measure its mass, in grams, as accurately as possible. Take the measuring cylinder off the balance and add the water carefully. Put the measuring cylinder back on the balance. Measure and record the new mass . Repeat the procedure,  recording the volume and total mass, until the measuring cylinder is full. Then, for each volume calculate the mass of the liquid alone.Repeat steps 1 to 3  Draw a graph of mass of liquid against volume .  Calculate the density of each liquid from the gradient of its graph line.

Explanation:

The kinds of things that would you need to survive on a deserted island are as follows:

Survival may be characterized as the process that supports you to exist in a place where there is a lot of difficult circumstances arise. It may be of the scarcity of food, space, etc.

According to the context of this question, for the actual and fundamental survival of life, you would not need an internet or cellular connection. But in spite of this one must require fresh air, potable water, and healthy food.

Therefore, the kinds of things that would you need to survive on a deserted island are well described above.

To learn more about Survival, refer to the link:

https://brainly.com/question/14836335

#SPJ1

Nuclear fission occurs when a nucleus breaks up into two equal fragments that release and separate more atoms. So, the correct option is B.

Nuclear fission is a process in which the nucleus of an atom breaks apart into two or more smaller nuclei. This process releases a significant amount of energy.

This energy is utilized in various applications, including nuclear power generation and nuclear weapons. Nuclear fission reactions are carefully controlled in nuclear power plants to ensure the sustained release of energy without leading to uncontrolled chain reactions. Hence the correct option is B.

For more questions on nucleus

https://brainly.com/question/29855834

#SPJ8

Answer:

It can be separated by simple fractional method

What is the experiment

Water pollution is described as the presence of toxins in water sources that make it unsafe for use in drinking, cooking, cleaning, swimming, and other activities.

Pollutants include things like chemicals, trash, bacteria, and parasites. All pollution eventually finds its way into the water.

The Clean Water Act is what?

The Clean Water Act (CWA) establishes the fundamental framework for policing pollutant discharges into US waters as well as standards for the cleanliness of surface waters.

The CWA is thought to have its roots in the Federal Water Pollution Control Act, which was approved in 1948 but underwent considerable revisions and expansion in 1972. The Act's common name was modified to "Clean Water Act" with revisions in 1972.

To know more about water, visit:

https://brainly.com/question/19920929

#SPJ1

The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

learn more about significance level Here:

https://brainly.com/question/30766149

#SPJ4

Answer:

H2O with 2 hydrogen and 1 oxygen

Answer:

d = 3 g/cm³

Explanation:

Given data:

Mass of stone = 27 g

Volume of water = 10 cm³

Volume of water+ stone = 19 cm³

Volume of stone = ?

Density of stone = ?

Solution:

Volume of stone = total volume - volume of water

Volume of stone = 19 cm³ -  10 cm³

Volume of stone = 9 cm³

Density of stone:

d = m/v

d = 27 g/ 9 cm³

d = 3 g/cm³

The formation of a solid from two liquids will be a chemical change since a precipitate is formed, creating something new.

The difference in degrees Fahrenheit between the maximum expected temperatures by the end of the century between the lower and higher emissions scenarios can vary depending on various factors and assumptions.

However, in general, the lower emissions scenario is expected to result in a lower increase in global temperatures compared to the higher emissions scenario.

This means that the maximum expected temperature rise by the end of the century under the lower emissions scenario would be lower than that of the higher emissions scenario.

The specific temperature difference would depend on the specific projections and models used, but it highlights the significant impact that emissions reductions can have on mitigating future temperature increases.

To know more about global temperatures, refer here:

https://brainly.com/question/14367287#

#SPJ11

The cleaning process may have removed some of the thermal insulation from the reboiler or condenser. This would reduce the amount of heat that is transferred from the reboiler or condenser to the liquid in the distillation column, which would lead to a decrease in the tower bottom temperature.

The cleaning process may have damaged the heat transfer surfaces of the reboiler or condenser. This would also reduce the amount of heat that is transferred, leading to a decrease in the tower bottom temperature. The cleaning process may have introduced contaminants into the distillation column. These contaminants could interfere with the heat transfer process, leading to a decrease in the tower bottom temperature. It is also possible that a combination of these factors is responsible for the decrease in the tower bottom temperature.

To troubleshoot the problem, you could try the following:

Inspect the reboiler and condenser to see if any insulation has been removed or if the heat transfer surfaces have been damaged.

Take a sample of the liquid in the distillation column and analyze it for contaminants.

Change the operating parameters of the distillation column, such as the feed flow or steam flow, to see if this changes the tower bottom temperature.

To know more about distillation , click here:-

https://brainly.com/question/31829945

#SPJ11

Answer:

: B, if it is produced in an earlier step. Which term refers to a substance that is formed in one step of a reaction mechanism and consumed in a subsequent step of the reaction mechanism? D: reaction intermediate

Explanation:

pa brainlyes po kailangan lang talaga

Answer:

its D

Explanation:

trust

Answer:o It is important to realise that mixing will be small unless there are electrons in the 4a1 LUMO, this is why NH3 is pyramidal while BH3 is planar! ... This mixing is very strong and stabilises the 3a1 MO substantially and hence NH3 is trigonal pyramidal and not planar.

Explanation:

Answer:

c

Explanation:

c is correct i believe

Refer to the attachment

In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals

Answer:

1.  Place in a platic bag and use a magnet to attract the iron filings.  [See explanation for an alternative step].

2. Disolve the remainer in water

3.  Pass the liquid through a microporous filter to capture the undissolved sulfur

4.  Evaporate the filtered water to retrieve iron chloride crystals

Explanation:

The Fe(II) chloride will dissolve in water.  It is paramagnetic, and thus is weakly attracted to a magnet.  The process above should not result in attracting the solid Fe(II) crystals.  In fact, it is probably acceptable to dissolve the entire sample in water as the fisrt step.  The dissolved Fe(II) chloride should also not be strongly attraced to a magnet, and htis step would allow easier separation of the iron filings.

Sulfur is not soluble in water, so it will collect as a dsolid in the microporous filter.

The Fe(II) has a high solubility, so it will wind up in the filtered soluition.  Evaopate using heat or vacuum to retrieve the solid Fe(II) chloride crystals (they will be hydrated).