Describe the evidence for Mercury having a molten iron core

Answers

Answer 1
Scientists used the calculated density to determine that Mercury holds a large metallic core. Radar images taken from Earth revealed that the core is molten liquid, rather than solid. Mercury's core has more iron than any other planet in the solar system.

Related Questions

3.0 moles of nitrogen is reacted with 11.0 moles of hydrogen to produce ammonia according to the chemical equation shown below. Which one of the following statements is false?
N2(g) + 3 H2(g) → 2 NH3(g)
a. Hydrogen is the excess reactant.
b. 2.0 moles of hydrogen are left over.
c. 12.0 moles of ammonia are produced.
d. Nitrogen is the limiting reactant.​

Answers

Answer:

c

Explanation:

From the equation, we can say that we need thrice the number of hydrogen than that of nitrogen

we are given 3 moles of nitrogen and 11 moles of hydrogen

but thrice the number of moles of nitrogen is 9, hence we have hydrogen in excess or Hydrogen is the excess reagent

Since we had 11 moles of Hydrogen and we only needed 9, 2 moles of hydrogen are left over

From the equation, we can see that the moles of ammonia formed will be twice the moles of nitrogen

Since 3 moles of nitrogen are used, the reaction will give us 6 moles of Ammonia and NOT 12 moles, therefore c is the correct answer

Since we have hydrogen in excess, our reaction is being limited because we have less Nitrogen, Hence Nitrogen is the Limiting Reagent

Option C is the only false statement

The false statement is that "12.0 moles of ammonia are produced"

According to the equation of reaction:

N₂  +  3H₂  >>>>>  2NH₃

1  mole of N₂ reacts with 3 moles of H₂

3 moles of N₂ will react with 9 moles of H₂

Since 3 moles of N₂ is said to react with 11 moles of H₂ (instead of 9 moles of H₂), H₂ is in excess by 2 moles. That is, N₂ is the limiting reactant.

Since N₂ is the limiting reactant:

1 mole of  N₂ produces 2 moles of NH₃

3 moles of N₂ will produce 6 moles of NH₃

Therefore, we can conclude that:

Hydrogen is the excess reactant2.0 moles of hydrogen are left overNitrogen is the limiting reactant

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What are the properties of baking powder, baking soda, corn starch, gelatin, and salt?

Answers

Answer:

heeeee pues hola no se chao

Answer:

B. salt

-

I know that you answered this question like a month ago, but im going to answer anyway for the people who is having a hard time answering this :D

In a compound the elements are _____ together, whereas in a mixture the substances are blended together.

Answers

Answer:

bonded

Explanation:

Compounds are two elements bonded together.

A mixture is multiple substances blended together.  The substances aren't bonded together and can easily be extracted  from each other.

A laser pointer used in the classroom emits light at 5650 Å, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

Answers

Answer:

n = 1.3 x 10¹⁸ photons

Explanation:

First we need to calculate the amount of energy released in given time:

E = Pt

where,

E = Energy  = ?

P = Power = 4 mW = 0.004 W

t = time = 115 s

Therefore,

E = (0.004 W)(115 s)

E = 0.46 J

Now, this energy can be given in forms of photons as:

E = nhc/λ

where,

n = No. of photons = ?

h = Plank's Constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength of light = 5650 x 10⁻¹⁰ m

Therefore,

0.46 J = n(6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(5650 x 10⁻¹⁰ m)

n = (0.46 J)/(3.5 x 10⁻¹⁹ J)

n = 1.3 x 10¹⁸ photons

Answer:

1.308 x 10¹⁸ photons were emitted from the laser pointer.

Explanation:

Given;

wavelength of the photon, λ = 5650  Å = 5650 x 10⁻¹⁰ m

power emitted by the source, P = 4 mW = 4 x 10⁻³ W

time of photon emission, t = 115 s

The energy of a single photon is given by;

E = hf

f = c / λ

[tex]E = \frac{h c }{\lambda}[/tex]

where;

c is speed of light = 3 x 10⁸ m/s

h is Planck's constant = 6.626 x 10⁻³⁴ Js

[tex]E = \frac{(6.626 *10^{-34}) (3*10^8) }{5650*10^{-10}}\\\\ E = 3.518*10^{-19} \ J[/tex]

Energy of the source (laser pointer) = P x t

                                                           = (4 x 10⁻³ W) (115 s )

                                                           = 0.46 J

If no energy is lost, then emitted energy by the source must be equal to total energy of then photons;

[tex]E_T = n E_{photon}\\\\n = \frac{E_T}{E_{photon}}\\\\n = \frac{0.46}{3.518*10^{-19}}\\\\n = 1.308*10^{18} \ photons[/tex]

Therefore, 1.308 x 10¹⁸ photons were emitted from the laser pointer.

Is it possible to produce a blood type AB from blood type A and B

Answers

Answer:

Yes, it is possible to produce a blood type AB from blood type A and B.

Explanation:

If we were to do a hybrid cross and the mother's blood type was A, then her genotypes would be AA and AO. Additionally, if the father had type B blood, his genotypes would be BB and BO. From this, we can tell that the child's genotypes would have to be A, AB, B, O. Since AB is one of the choices, yes, it is possible to produce a blood type AB from blood type A and B.

The only times where you won't be able to produce a child with type AB is if both of the parents have type B blood and type O blood. Or if one parent has type B blood and the another has type O blood. Or if one parent has type AB and the other one has O blood. Or if both parents have type A blood.

The density of water at 40°C is 0.992 g/mL. What is the volume of 2.69 g of water at this temperature? V= mL​

Answers

Answer:

[tex]\boxed {\tt 2.71169355 \ mL}[/tex]

Explanation:

Density can be found using the following formula:

[tex]d=\frac {m}{v}[/tex]

Rearrange the formula for v. Multiply both sides by v, then divide both sides by d.

[tex]d*v =\frac {m}{v}*v[/tex]

[tex]d*v=m[/tex]

[tex]\frac{d*v}{d}=\frac{m}{d}[/tex]

[tex]v=\frac{m}{d}[/tex]

The volume can be found by dividing the mass by the density. The mass is 2.69 grams and the density is 0.992 grams per milliliter.

[tex]m= 2.69 \ g\\d= 0.992 \ g/mL[/tex]

Substitute the values into the formula.

[tex]v=\frac{2.69 \ g}{0.992 \ g/mL}[/tex]

Divide. Note that the grams, or g, will cancel each other out.

[tex]v=\frac{2.69}{0.992 \ mL}[/tex]

[tex]v= 2.71169355 \ mL[/tex]

The volume of the water is 2.71169355 milliliters.

Which of the following pairs of elements are most likely to form an ionic bond?


A- Br and Ca

B- Br and N

C- Ca and Mg

D- Ca and Fe

Answers

Answer:

Ionic bonds ussally form with a metal, and a non metel elements, so the answer would most likley be B.

Explanation:

hope I could help

In an atom of an element there are a fixed number of electrons. If the total mass of electrons in 1 mole (6.022 x 1023) of atoms of a certain element is 18.65 mg, how many protons must there be in the nucleus of that atom? (mass of electron = 9.109 x 10–28 g).

Answers

Answer:

No. of protons = 34

Explanation:

First we need to calculate the number of electrons in one mole of the the element:

No. of electrons per mole = Total Mass of Electrons/Mass of 1 Electron

No. of electrons per mole = (18.65 x 10⁻³ g)/(9.109 x 10⁻²⁸ g)

No. of electrons per mole = 2.04 x 10²⁵ electrons/mol

Now, we calculate the no. of electrons in 1 atom:

No. of electrons per atom = No. of Electrons per mole/No. of atoms per mole

No. of electrons per atom = (2.04 x 10²⁵ electrons/mol)/(6.022 x 10²³ atoms/mol)

No. of electrons per atom = 34 electrons/atom

Since, the no. of protons in a pure element are equal to the number of electrons. Therefore,

No. of protons = 34

In this exercise we have to use the knowledge of atoms to calculate the number of protons, in this way we find:

Protons will be  34

First we need to reckon the number of electrons fashionable individual blemish of the the place where one feels comfortable:

[tex]electrons \ per \ mole = Total\ Mass\ of \ Electrons/Mass\ of\ 1 \ Electron\\ electrons\ per\ mole = (18.65 * 10^{-3} g)/(9.109 * 10^{28} g)\\ electrons \ per \ mole = 2.04 x 10^{25} electrons/mol[/tex]

Now, we plan on the electrons in 1 smallest part of something:

[tex]electrons\ per\ atom = Electrons\ per\ mole/atoms\ per\ mole\\ electrons\ per\ atom = (2.04 * 10^{25} electrons/mol)/(6.022 * 10^{23} atoms/mol)\\ electrons\ per\ atom = 34 electrons/atom [/tex]

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Solute and solvent in pasta

Answers

Answer:

It depends on what kind of pasta it is

1. How many ATOMS of carbon are present in 7.48 grams of carbon monoxide ?

Answers

Answer:

The answer is 1.61 × 10²³ atoms

Explanation:

To determine number of atoms, we will use the formula below

Number of atoms = number of moles (n) × avogadro's constant (6.02 x 10²³)

n was not provided, hence we will solve for n

n = mass/ molar mass

molar mass of carbon monoxide, CO (where C is 12 and O is 16) is 12 + 16 = 28

mass was provided in the question as 7.48

n = 7.48/28

n = 0.267

Hence,

number of atoms = 0.267 × 6.02 x 10²³

= 1.61 × 10²³ atoms

I am timed please help

Answers

Answer:

compound

Explanation:

MgO is an inorganic compund :) The simplest explanation is that it's not an element b/c there's two elements (Mg & O) in the substance, and it's not a mixture b/c you can't easily separate the two elements.

Answer:

magnesium when magnesium is burnt by heat it forms an compound called magnesium oxide

Choose the answer that shows the following number correctly
written in scientific notation.
430,000
a 4.3 x 104
b 43 x 104
C 0.43 x 106
d 4.3 x 105

Answers

D) 4.3 x 10^5 is the answer

Brainliest?

6. Un volumen de 1.0 mL de agua de mar contiene casi 4 x 10-12 g de Au. El volumen total de agua en los océanos es de 1.5 x 1021 L. Calcule la cantidad total de Au (en gramos) existente en los océanos y su valor total en dólares. ( 1 onza = $ 948)

Answers

Answer:

The total amount of Au is $ [tex]2.0\times10^{24}[/tex]

Explanation:

Given that,

Mass of 1.0 ml of Au [tex]m=4\times10^{-2}\ g[/tex]

Total volume of water in oceans [tex]V=1.5\times10^{21}\ L[/tex]

We need to calculate the volume in ml

Using given volume

[tex]V=1.5\times10^{21}\times1000\ mL[/tex]

[tex]V=1.5\times10^{24}\ mL[/tex]

We need to calculate the total mass of Au  

Using given data

[tex]1\ ml\ volume = 4\times10^{-2}\ g[/tex]

[tex]1.5\times10^{24}\ ml=4\times10^{-2}\times1.5\times10^{24}[/tex]

So, The total mass of Au is [tex]6\times10^{22}\ g[/tex]

The mass will be in ounce,

[tex]Mass=0.035274\times6\times10^{22}[/tex]

[tex]Mass=2.12\times10^{21}\ ounce[/tex]

The total amount of the Au Will be

[tex]Total\ amount=2.12\times10^{21}\times948[/tex]

[tex]Total\ amount=2.0\times10^{24}[/tex]

Hence, The total amount of Au is $ [tex]2.0\times10^{24}[/tex]


The first health care worker said, "Anatomy and Physiology makes the difference between me being a nurse and a ______ nurse?

Answers

Answer

The first health care worker said, "Anatomy and Physiology makes the difference between me being a nurse and a great nurse?

Explanation:

I got the correct answer

Identify the type of chemical reaction taking place in the following and write in balanced equation from
a) Barium Chloride mixed with copper sulphate solution and a white precipitate is observed b) On heating green colour sirf ferrous sulphate crystals reddish brown solid left and smell of gas having order of burning sulphur is produced.​

Answers

Answer:

a. The balanced chemical equation is written below and this is a type of double displacement reaction.

Explanation:

When barium chloride reacts with copper sulfate, a white precipitate of barium sulfate is observed.

The chemical equation for the reaction of barium chloride and copper sulfate follows:

b.

2FeSO4--(heat)---> Fe2O3 + SO2+ SO3

This Reaction is an example of Thermal Decomposition Reaction.

When potassium chlorate decomposes to potassium chloride and oxygen gas is it a physical or chemical change?

Answers

It is an example of a Chemical change.

explain why division by zero is undefined​

Answers

Answer:

Division by zero is undefined because there is no other number to divide it by.

Explanation:

Unlike 2/2, 2/0 doesn't have anything to divide the 2 by which makes it undefined and impossible to solve.

The division by zero is undefined​, because whatever response we may give, we will then have to concur that the answer times 0 = 1, which is illogical because anything multiplied by zero is zero.

Why division by zero is undefined​ ?

Since any attempt at definition results in a contradiction, the outcome of a division by zero cannot be defined. a=r*b. r*0=a. (1) (1) But because r*0=0 for all r, there is no solution to the equation unless a=0 (1).

Again, mathematicians have left zero divided by zero as an open problem because they are both equally valid and, to be honest, neither of them is consistent with the rest of mathematics.

Mathematically, it is impossible to divide a number by zero, just as in this illustration. Or, at the very least, there isn't currently a means to do that. Numerous attempts have been made to figure out how to divide by zero, as mathematicians are constantly looking for solutions to intriguing mathematical issues.

Thus, The division by zero is undefined​, because whatever response we may give, we will then have to concur that the answer times 0 = 1.

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how do you calculate the number of neutrons in atom

Answers

Answer:

Yes, it is standard for each element. You can calculate it from the formula: n=A-Z, where n is the number of neutrons, A is the atomic mass and Z is the atomic number.

what is zirconium electron configuration

Answers

kr,5s2,4d2

Explanation:

as itis in the 2nd transition series

If a boy was standing on his head, his mouth would be ___ to his nose.

Answers

Answer:

The correct answer is "inferior".

Explanation:

In anatomy, the term inferior is used to describe parts of the body that are below other part used as reference. Inferior comes from the Latin "inferus" that means "below". In this case, the mouth will always be inferior to the nose, it doesn't matter if the boy was standing on his head or if he is in other position.

Answer:

correct answer, inferior.

Explanation:

of little or less importance, value, or merit always felt inferior to his older brother. 2a : of low or lower degree or rank. b : of poor quality : mediocre. 3 : situated lower down : lower.

If one person is regarded as inferior to another, they are regarded as less important because they have less status or ability. He preferred the company of those who were intellectually inferior to himself.

Hope this helped!

An example of an extensive physical property is
Group of answer choices

mass

density

boiling point

melting point

Answers

Answer:

boiling point

the atomic mass of the isotope copper-__ is 62.930 amu

Answers

the correct answer is copper 63

We have that The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63

Cu 63

From the question we are told

the atomic mass of the isotope copper-__ is 62.930 amu

Generally

Copper is the 29th element of the the periodic table with an atomic mass of 29.

Copper as an elementt has 2 stable isotopes which are

Cu 63

Cu 65

Therefore

The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63

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Pb-214 in beta decay

Answers

Lead 214 emits then beta electrons to transform into bismuth 214 and polonium 214, which produces lead 210 through the emission of a third alpha particle. This series of transformations take place in a time span roughly equal to an hour.

Hope this helps, if I am right, brainliest? :))))

what is the strength of alloys and what is the solubility of alloys please answer this simple question within 12 hours will mark brainliest for sure

Answers

Answer:Features very high tensile strength and toughness. Titanium alloys are light in weight, have superior corrosion resistance properties and can withstand extreme temperatures. ... Titanium alloys are heat-treated to increase their strength in terms of fracture toughness, fatigue strength and high temperature strength.35 grams is the sollubility.

Explanation:

You have a piece of gold jewelry weighing 9.35g. Its volume is 0.654cm 3 . Assume the metal is an alloy of gold and silver, which have densities of 19.3g/cm 3 and 10.5g/cm 3 , respectively. Also assume that there is no change in volume when the pure metals are mixed. Calculate the percentage of gold (by mass) in the alloy.

Answers

Answer:

57.54% is the percentage of gold by mass in the alloy.

Explanation:

The mass of the mixture is 9.35g. That is:

9.35g = Mass Gold + Mass Silver

Mass silver = 9.35g - Mass gold (1)

Now, the volume of the jewelry is the sum of volumes of gold and silver:

0.654cm³ = Mass Gold / 19.5g/cm³ + Mass silver / 10.5g/cm³ (2)

Volume = Mass / Density.

Replacing (1) in (2):

0.654cm³ = Mass Gold / 19.5g/cm³ + (9.35g - Mass gold) / 10.5g/cm³

0.654 = 0.051282 Mass Gold + 0.890476 - 0.095238 Mass gold

-0.236476 = -0.043956 Mass gold

Mass gold = 5.38g

And mass percent of gold in the alloy is:

5.38g / 9.35g * 100 =

57.54%

The nutrition label on rice lists the amounts of proteins, carbohydrates, and fats in one serving. These substances are important for human nutrition. How are proteins, carbohydrates, and fats related to the discipline of chemistry?

Answers

Answer:All are chemical compounds.

Some uses of titration in chem...
and definition of dipole moment​

Answers

Answer:

Titration is used to determine the concentration of unknown solutions.

A dipole moments is a measurement of the separation of two opposite electrical charges

what element has 3 protons 2 neutrons and 2 electrons

Answers

Answer:

helium i think

Explanation:

state raw material of wood charcoal and coke,lampblack​

Answers

Answer:

its a tree becoz charcoal came from wood

if volume stays the same, what happens to pressure?

Answers

Answer:

Pressure will stay the same if volume stays the same.

Answer:

Volume is inversely proportional to pressure, meaning if one goes up the other goes down and vise-versa. With volume remaining the same and there are no other given factors, pressure also remains the same

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This seems like a lot but it's not just gotta do some reading 20 POINTS HELP ASAP../ Read the excerpt from The Call of the Wild, and then follow the instructions below. .He [Buck] had killed man, the noblest game of all, and he had killed in the face of the law of club and fang. He sniffed the bodies curiously. They had died so easily. It was harder to kill a husky dog than them. They were no match at all, were it not for their arrows and spears and clubs. Thenceforward he would be unafraid of them except when they bore in their hands their arrows, spears, and clubs. .The above excerpt marks an important realization for Buck. You will be writing a short analysis paragraph about this passage; but first, you will complete a prewriting exercise to collect your ideas. Copy down the excerpt, and use a pen or highlighter to mark the words and phrases that are clues to the reader that Buck has just learned a surprising lesson. what is 210 divided by 2 1/2 what is the function in a cell of the carbon compounds lipids me itch all the time 51*3itchy itchy comon 14/3 How do u write 200+9+07+0.01 In written form What color is blood while its in your body ? Ally's paycheck stub shows an amount that was subtracted from her pay for federal income taxes. This is a what are super computers? what is their application in real life situation What is the term giving to total good health HELP!!Mark the figure to illustrate the givens.(Show work) ~will make brainliest Identify the letter of the choice that best answers the question.Which question might a reader of the following passage from "The Tell-Tale Heart" most reasonably ask?You fancy me mad. Madmen know nothing. But you should have seen me. You should have seen how wisely I proceeded-with what caution-A. Is the narrator lonely?B is the narrator insane?c. Will the narrator's story be long or short?D. Will the narrator find true love? 3. What does it mean when you say that a historical account is valid?The account was written by someone with a great deal of authority.The account is based on proven facts and good reasoning.The account is important, compared to other historical accounts.The account was created to prove a speaker's or writer's point.,please answe quickly i need this answer f(x)=18x+11, find f(5) Order the fractions from least to greatest. 2/3 ,4/9,5/6,7/12 Which of the following statements is false? A. If a number is a natural number, then it is rational. B. If a number is a whole number, then it is rational. C. If a number is a fraction, then it is rational. D. If a number is an integer, then it is irrational. Which description indicates a problem with the social aspects of health 7/8 + (-3/4) + (-7/-8)+ 3/4 Write a short dialogueboth sides of the conversationin Spanish between you and your classroom friend Celeste in complete sentences. Use the vocabulary from this lesson and the following suggestions as a guide for your answer: Which of the following statements about slope is NOT true? The whole numbers are the set of what numbers and zero ?