Mt. McKinley in Alaska has an altitude of 20,320 ft. Water (AH/ap
40.7 kJ/mol) boils in 77°C atop Mt. McKinley. What is the normal atmospheric pressure at the summit?

Answers

Answer 1

1156 ± 474

Explanation:


Related Questions

what is the coefficient of fe(oh)2 when the following redoxequation is balanced? bro- fe(oh)2 --> br- fe(oh)3 (basic solution)

Answers

The coefficient of fe(oh)2 in the balanced redox equation is 2.

What is redox reaction?

Any chemical reaction in which a participating chemical species' oxidation number changes is known as an oxidation-reduction reaction, often known as a redox reaction.

\(BrO- + H2O + 2e- > Br- + 2OH-\)

\(Fe(OH)2 + OH- > Fe(OH)3 + e-\)

\(BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3\)

The way of balancing is as follows

Step 1) divide the equations into two half reactions

oxidation half reaction                reduction half reaction

Fe(OH)2  --> Fe(OH)3                   BrO-  --> Br-

Step 2) balance atoms other than oxygen and hydrogen

Fe(OH)2  --> Fe(OH)3                    BrO-  --> Br-

Step 3) add OH- ions ,where the oxygen atoms are deficient, add the H2O molecules in required number to balance H atoms

 Fe(OH)2 + OH- --> Fe(OH)3            BrO-+H2O --> Br- + 2OH-

Step4) now add required number of electrons to balance the charge. don't forget the number of electrons loss in oxidation half reaction= the number of electrons gain in reduction half reaction

\(2Fe(OH)2 +2OH- -- > 2Fe(OH)3+2e-\)

\(BrO- + H2O +2e--- > Br- + 2OH-\)

Step5) now add the both half reactions ,re write

BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3.

Therefore, the coefficient of fe(oh)2 in the balanced redox equation is 2.

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Each mineral group has a distinctive chemical feature such as
a. oxides are a metal combined with oxygen
b. sulfides are a metal combined with sulfur and oxygen
c. halides are a salt combined with a metallic atom
d. phosphates are made of phosphate polygons

Answers

Answer:

A

Explanation:

Which statement is accurate about dominant alleles?
A: They are indicated by lowercase letters.
B: They result in the trait of shortness in pea plants.
C: They are expressed only when a recessive allele is not present.
D: They are expressed whenever present.

Answers

The statement is accurate about dominant alleles is they are expressed whenever present.

The relation between two versions of a gene are called as dominant. when the individual receive the two version of gene of each parent of gene known as alleles. if gene of alleles are different , one allele will be expressed as the dominant gene. Dominant alleles are expressed as phenotypic cell. Dominant alleles are indicated by the uppercase of a letter. so the dominant allele is that will be more powerful than the another allele.

Thus, The statement is accurate about dominant alleles is they are expressed whenever present.

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If the calcium hydroxide was determined to have a pH of 12.55, and it was made in 200.0 mL of water, then the mass required to prepare it would have been ___g

Answers

Calcium hydroxide is an ionic compound with the chemical formula Ca(OH)2. When it is dissolved in water, it dissociates into its constituent ions, which are calcium (Ca2+) and hydroxide (OH-) ions. The pH of the resulting solution depends on the concentration of hydroxide ions.

To calculate the mass of calcium hydroxide required to prepare a 200.0 mL solution with a pH of 12.55, we first need to determine the concentration of hydroxide ions in the solution using the pH value.

The pH of 12.55 corresponds to a hydroxide ion concentration of 2.00 x 10^-3 M. This is because pH is defined as the negative logarithm of the hydrogen ion concentration, and in a basic solution, the hydroxide ion concentration is equal to the hydrogen ion concentration multiplied by the concentration of water (which is approximately 55.6 M at room temperature). So:

pH = -log[H+]
pH = 14 - log[OH-]
12.55 = 14 - log[OH-]
log[OH-] = 1.45
[OH-] = 10^-pOH
[OH-] = 10^-12.55
[OH-] = 2.00 x 10^-3 M

The molar mass of calcium hydroxide is 74.093 g/mol (40.078 g/mol for calcium + 2 x 15.999 g/mol for oxygen + 2 x 1.008 g/mol for hydrogen). The number of moles of hydroxide ions in the solution is equal to the concentration multiplied by the volume (in liters) of the solution:

moles of OH- = [OH-] x volume
moles of OH- = 2.00 x 10^-3 M x 0.200 L
moles of OH- = 4.00 x 10^-4 mol

Since each molecule of calcium hydroxide dissociates into two hydroxide ions, the number of moles of calcium hydroxide required is half of the number of moles of hydroxide ions:

moles of Ca(OH)2 = 0.5 x moles of OH-
moles of Ca(OH)2 = 0.5 x 4.00 x 10^-4 mol
moles of Ca(OH)2 = 2.00 x 10^-4 mol

Finally, we can calculate the mass of calcium hydroxide required using its molar mass:

mass of Ca(OH)2 = moles of Ca(OH)2 x molar mass
mass of Ca(OH)2 = 2.00 x 10^-4 mol x 74.093 g/mol
mass of Ca(OH)2 = 0.0148 g

Therefore, the mass of calcium hydroxide required to prepare a 200.0 mL solution with a pH of 12.55 is approximately 0.0148 g.

100 cm³ of a gas at 27°C is cooled to 20°C at constant pressure .Calculate the volume of gas at 20°C.

Answers

Answer:\(97.67\operatorname{cm}^3\)

Explanations:

According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

\(\begin{gathered} V\alpha T \\ V=kT \\ k=\frac{V}{T} \\ k=\frac{V_1}{T_1}=\frac{V_2}{T_2} \end{gathered}\)

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

\(\begin{gathered} V_1=100\operatorname{cm}^3 \\ T_1=27^0C=27+273=300K \\ T_2=20^0C=20+273=293K \\ V_2=\text{?} \end{gathered}\)

Substitute the given parameters into the formula;

\(\begin{gathered} V_2=\frac{V_1T_2}{T_1}^{} \\ V_2=\frac{100\times293}{300} \\ V_2=\frac{29300}{300} \\ V_2=\frac{293}{3} \\ V_2=97.67\operatorname{cm}^3 \end{gathered}\)

Therefore the volume of the gas at 20°C is approximately 97.67cm³

The primary source for nitrogen oxide emissions in the US is from industries. A ) TRUE B ) FALSE.

Answers

Answer:

False

Explanation:

Which
element does the electron configuration 1s?2s?2p? represent?
O B
O C
ON
O K

Answers

Boron you are count to the 5th element

a compound is found to contain 53.70% iron and 46.30% sulfur. Find The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur

Answers

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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It's five minutes before your lab period begins and you realize that you are not properly dressed for lab. You could (choose all correct options)

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It's five minutes before your lab period begins and you realize that you are not properly dressed for lab. You could F. A, B and D

Return to your residence to get the proper clothing, if time permits. This is a good option if you live close to the campus and can quickly change into the appropriate clothing without wasting too much time. However, if you live far away or have a long commute, this may not be a practical option.

Go to the Student Stores to purchase the proper clothing. This is a good option if the Student Stores are nearby and if they carry the clothing that you need. However, this may not always be the case, and you may end up wasting time and money trying to find suitable clothing.

Ask a friend to bring proper clothing, if time permits, is a good option if you have a friend who is nearby and willing to help. However, this may not always be the case, and you may end up causing inconvenience to your friend by asking them to drop everything and bring you the clothing that you need.

Overall, the best option is to plan ahead and ensure that you are properly dressed for lab well in advance. This will help you avoid any last-minute emergencies and ensure that you are able to focus on your lab work without any distractions. Therefore, the correct option is F.

The Question was Incomplete, Find the full content below :

It's five minutes before your lab period begins and you realize that you are not properly dressed for lab. You could (choose all correct options):

A. Return to your residence to get the proper clothing, if time permits.

B. Go to the Student Stores to purchase the proper clothing.

C. Try to sneak into lab while your TA is not looking.

D. Ask a friend to bring proper clothing, if time permits.

E. All of the above

F. A, B and D

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figure of bryophyta​

Answers

Answer:

The hornworts (Anthocerotophyta) belong to the broad bryophyte group. ... The lifecycle of hornworts (Figure 5) follows the general pattern of alternation of generations. The gametophytes grow ..

Explanation:

While bryophytes have no truly vascularized tissue, they do have organs that are specialized for specific functions, analogous for example to the functions of leaves and stems in vascular land plants. Bryophytes depend on water for reproduction and survival.

BryophytaThese are called the amphibians of the plant kingdom.The adult plant body is haploid gametophyte.The plants are commonly differentiated to form stem and left-like structure.There is no specialised conducting tissue for the conduction of water and other substances from one part of the plant body to another.

What happens during meiosis that does NOT happen during mitosis?
A new cells are formed
B two rounds of cell division
C DNA is passed on to the daughter cells
D parent cells grow in size before division
please help

Answers

Answer is B two rounds or cell division

This picture shows students working in a

chemistry laboratory. What could they do to make

their lab safer?

Label the test tubes and plastic cups.

Move the fire extinguisher closer to their

table.

Wear chemical protective gloves.

Reduce the clutter on the table.

Stand at the table instead of sitting. Tie long hair back.

DONE

Answers

Answer:

wear chemical protective gloves.

Explanation:

This is difficult to choose but I think it should be wear chemical protective gloves.

Answer: The correct answers are:

- Label the test tubes and plastic cups

- Wear chemical protective gloves

- Tie long hair back

Explanation: I just did the question

the limiting reagentr in the experimnents described in the passage is : A. iodine. B. Zinc C. Methanol D.Iodide

Answers

The limiting reagent in the experiments described in the passage is

C. Methanol.

In a chemical reaction, the limiting reagent is the reactant that is completely consumed, thus limiting the amount of product that can be formed. It determines the maximum amount of product that can be obtained. Based on the given options, if methanol is the limiting reagent, it means that it is present in a quantity that is less than what is required to react completely with the other reactants. This suggests that methanol is the reactant that will be completely consumed, while the other reactants (iodine, zinc, and iodide) will be present in excess. Identifying the limiting reagent is essential for determining the theoretical yield of the product and understanding the stoichiometry of the reaction.

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5 A student finds the mass and volume of four mystery liquids. Liquid Mass (9) Volume (mL) W 5 5 х 6 2 Y 2. 1 Z 2 00 No The student knows that the density of water is 1 g/mL. Which of the four mystery liquids can be correctly identified as water? Density = Mass / Volume A w B X​

5 A student finds the mass and volume of four mystery liquids. Liquid Mass (9) Volume (mL) W 5 5 6 2

Answers

Answer:

A. W

Explanation:

we know the equation Density = mass/volume ( D = g/mL ).

we know that the density of water is 1 g/mL.

Liquid W = 5g/5 mL = 1 g/mL

Liquid X = 6g/2 mL = 3 g/mL

Liquid Y = 2g/1 mL = 2 g/mL

Liquid Z = 8g/.2 mL = 40 g/mL

Answer: A. W because that liquid has the same density as water.

Hope this helps you.

A patient needs to take 875mg twice daily The pills in the bottle are each 250mg How many pills does she wants to take 875mg

Answers

Answer:

\(3.5\) pill need to taken for completing dosage of \(875\) mg

Explanation:

Total dosage of medicine to be taken in a day

\(= 2 * 875 \\= 1750\)mg

Total weight of one pill \(= 250\) mg

Number of pills required is equal to total dosage of medicine divided by the weight of one pill.

Hence,

Number of pills

\(= \frac{875}{250} \\= \frac{175}{50} \\= \frac{35}{10} \\= 3.5\)

What happens when Sulphuric acid is added to into Barium Chloride solution?​

Answers

Answer:

please give me brainlist and follow

Explanation:

When dilute sulphuric acid is added to barium chloride solution, barium sulphate is formed as a precipitate and hydrogen chloride is formed in aqueous solution.

What is the minimum amount of bonds a carbon hydrogen molecule has to have to be identified as a alkyne?
at least on double bond
derived from living organisms
alkynes are carbon chains with at least one triple bond.

Answers

A carbon-hydrogen molecule itself does not have a specific classification like alkyne. The classification of hydrocarbon compounds, including alkanes, alkenes, and alkynes, is based on the arrangement of carbon and hydrogen atoms in the larger molecule.

To be identified as an alkyne, a carbon-hydrogen (C-H) molecule does not have to have any specific number of bonds. Carbon-hydrogen molecules themselves do not have specific classifications like alkanes, alkenes, or alkynes. These terms are typically used to describe hydrocarbon compounds consisting of carbon and hydrogen atoms in specific arrangements.

Alkanes are hydrocarbons that contain only single bonds, alkenes contain at least one double bond, and alkynes contain at least one triple bond. These classifications are based on the types of bonds between carbon atoms, rather than the number of bonds a carbon-hydrogen molecule has.

In summary, a carbon-hydrogen molecule itself does not have a specific classification like alkyne. The classification of hydrocarbon compounds, including alkanes, alkenes, and alkynes, is based on the arrangement of carbon and hydrogen atoms in the larger molecule.

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Which object absorbs the most sound waves?
O A. Tissue paper
O B. Air
O C. Earplugs
O D. Water

Answers

Answer:

Earplugs

Explanation:

Because sound waves absorb most sound, the sound is coming from the earplugs which creates the most sound waves rather than water, tissue paper, and air.  Hope i helped :)

Answer:

Earplugs

Explanation:

How do weak intermolecular bond strengths affect the melting and boiling point of a substance?

The melting point is lower, but the boiling point is higher.

Both the melting point and boiling point are lower.

The melting point is higher, but the boiling point is lower.

Both the melting point and boiling point are higher.

Answers

Considering the definition of intermolecular bond, the correct answer is second option: Both the melting point and boiling point are lower.

The molecules of covalent compounds can be held together through electrostatic interactions known as "intermolecular forces", which are characterized by holding more than one molecule together. Therefore, they are related to chemical bonds, which have the goal of making molecules stick together or separate.

In other words, intermolecular forces or bonds are those interactions that hold molecules together. These are electrostatic forces.

The presence of these forces explains, for example, the properties of solids and liquids.

They differ from intramolecular forces, because of these, they correspond to interactions that hold the atoms in a molecule together. In general, intermolecular forces are much weaker than intramolecular forces.

On the other side, the melting point is the temperature at which a substance goes from solid to liquid at a given pressure. Similarly, the boiling point is the temperature at which the substance passes from a liquid to a gaseous state.

Finally, the more intense the intermolecular forces, the higher the melting point and the boiling point of a substance because these are the forces that must be overcome to separate them.

In summary, the correct answer is second option: Both the melting point and boiling point are lower.

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When temperature inside a hot air balloon increases what happens to the pressure and volume?

Answers

Answer:

The pressure increases and the volume remains constant

Explanation:

Describe the particles in each state of matter

Solid:
Liquid:
Gas:

Answers

Answer:

Solíd= vibrating

liquid= moving slowly

gas= moving faster

Of the following, all are valid units for a reaction rate except ________. g/s M/s mol/L-hr mol/hr mol/L

Answers

All the units listed in the question can be valid units for a reaction rate, except for the unit of grams per second (g/s). Reaction rate is defined as the change in concentration of a reactant or product per unit time. It is usually expressed in units of mol/L-time, where time can be in seconds, minutes, or hours.

The unit of M/s (molarity per second) is often used for expressing the reaction rate, especially in kinetics studies. The unit of mol/L-hr (molarity per hour) is also a valid unit for expressing the reaction rate, as it represents the change in concentration per unit time.

The units of mol/hr (moles per hour) and mol/L (molarity) are also used to express the reaction rate. However, the unit of g/s is not a valid unit for a reaction rate, as it represents the mass of a substance per unit time, rather than the change in concentration per unit time.

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A molecule in the J=3 state absorbs a photon. What are the possible momenta of the resultant molecule?

Answers

The possible momenta of the resultant molecule are `±1, 0`.

When a molecule in the J=3 state absorbs a photon, the possible momenta of the resultant molecule are `±1, 0`.

Explanation:

Absorption of a photon occurs when a molecule goes from a lower energy state to a higher energy state. In the process, the molecule gains energy equal to the energy of the photon it absorbs.

The energy of the photon is given by `E = hν`,

where `h` is Planck's constant

and `ν` is the frequency of the photon. The change in energy of the molecule is given by `ΔE = E2 - E1`, where `E2` is the energy of the higher state and `E1` is the energy of the lower state

.For a molecule in the J=3 state, the possible values of the angular momentum quantum number are `J = 3, 2, 1, 0, -1, -2, -3`. When the molecule absorbs a photon, it can transition to a higher J state or to a lower J state. The possible transitions are:`ΔJ = ±1` - This corresponds to a change in the angular momentum of the molecule. This means that the molecule gains or loses angular momentum when it absorbs a photon.`ΔJ = 0` - This corresponds to no change in the angular momentum of the molecule. This means that the molecule remains in the same J state when it absorbs a photon. Therefore, when a molecule in the J=3 state absorbs a photon, the possible momenta of the resultant molecule are `±1, 0`.

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why does dew form on grass in the early morning

Answers

Dew forms on the grass in the early morning due to the process of condensation.

During the day, the sun heats up the ground and the air around it. When the sun sets, the ground and the air begin to cool down. As the air cools, its ability to hold moisture decreases. When the temperature drops below the dew point, which is the temperature at which the air is saturated and cannot hold any more moisture, the excess moisture in the air condenses into liquid water droplets. These droplets then collect on cool surfaces, such as grass, forming dew.

The grass is a good surface for dew to form on because it is usually cooler than the surrounding air due to transpiration, the process by which water evaporates from the leaves and stems of plants. This causes the grass to cool down faster than the air around it, making it more likely for dew to form on its surface.

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Honey ask a scientific question: “How does the water temperature affect the amount of jaggery that dissolves?” She lists the important variables in her investigation. - temperature of water - the amount of jaggery that dissolves
- volume of water
- size of jaggery
- texture of jaggery
1). Choose the variable in the list above that she should change.
2). Choose the variable in the list above that she should measure.​

Answers

Answer:

She should change the temperature of the water.She should measure the amount of jaggery that dissolves.

Explanation:

It's important to note that all of the variables listed could potentially affect the amount of jaggery that dissolves in water. However, in order to investigate the effect of water temperature on the amount of jaggery that dissolves, she should hold all other variables constant (such as the volume of water, size of jaggery, and texture of jaggery) and only vary the temperature of the water.

- By doing this, she can isolate the effect of water temperature on the amount of jaggery that dissolves and draw conclusions about the relationship between these two variables.

Let me know if you have any further questions.

chromatography separates solutions on the basis of while distillation separates solutions on the basis of

Answers

Distillation, separates solutions based on the differences in boiling points of the components.

What is distillation?

Based on the components of the mixture's varying affinities for a stationary phase and a mobile phase, chromatography separates solutions. The mobile phase is often a liquid or a gas, while the stationary phase might be either a solid or a liquid.

Contrarily, distillation divides solutions according to variations in the components' boiling points. The lower boiling point component will evaporate and ascend as a vapor when a combination is heated, whereas the higher boiling point component will remain in the liquid phase.

This technique takes advantage of the fact that various substances have varying boiling points. A purified component is then obtained by condensing and collecting the vapor.

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1. Is energy something a system does or something
it has? Explain.

Answers

Answer:

it has

Explanation:

energy cannot be made, its always there, it just can be activated to do something.

hope this helps

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Atoms of an element containing different numbers of neutrons but the same number of protons are called .

Answers

Atoms that contain the same number of protons but different numbers of neutrons are called isotopes of the element. We total the number of protons and neutrons to name the isotope.

Answer: Your answer would be, Isotopes!

Explanation: Isotopes, also known as isotopic nuclides, are two atoms with the same atomic number but different masses (the same number of protons but different numbers of neutrons).

The element has protons and neutrons

Answers

Answer:

All elements have protons and neutrons.

Explanation:

Sure, some standard norms of elements don't have neutrons present (like hydrogen), but different forms of hydrogen have neutrons. Neutrons can and are present in every element in the Periodic Table of Elements.

(True or false) Two or more atoms combine to form a molecule ____

Answers

Answer:

false tjytyjiy

Explanation:

cnruujrkyrryyrkkurk

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