What is the mass of 50 molecules (HCO2H)?

The charged particles involved in  Thomson’s cathode–ray tube experiment is the negatively charged particles that we now call electrons.

The charged particles involved in the mass spectrometer is positively charged ions that is being deflected by magnetic fields.

The Mass spectrometer is an analytical tool that is used to measure the mass-to-charge ratio of ions.

One of the advantages of the mass spectrometer is that it is an excellent tool for identifying unknown components in a sample or confirming their presence.

The major disadvantages of mass spectrometer is that it is not very good at identifying hydrocarbons that produce similar ions and it's unable to tell optical and geometrical isomers apart.

In conclusion, some applications of mass spectrometer includes drug testing and discovery, food contamination detection.

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Heat transferred is already given in the question

Answer:

A landform is a feature on the Earth's surface that is part of the terrain. Mountains, hills, plateaus, and plains are the four major types of landforms. Minor landforms include buttes, canyons, valleys, and basins. Tectonic plate movement under the Earth can create landforms by pushing up mountains and hills.

Explanation:

"Waterways" are the other large features that cover the surface of the earth.

A canal would be any body of water throughout which boats may move. Waterways, on the other hand, comprise waterways that seem to be expansive as well as shallow enough already to allow freight-carrying watercraft just to travel through.

Some bodies of water are usually regularly dredged to maintain an appropriately deep course throughout all circumstances. Dams change the depth of other rivers in particular parts.

Thus the response above i.e., "Option B" is correct.

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Answer:

\(mol=0.0709mol\)

Explanation:

Hello,

In this since one mole equals 6.022x10²³ particles of silver by means of the Avogadro's number, we can compute the moles in 4.27x10²² particles as shown below:

\(mol=4.27x10^{22}particles*\frac{1mol}{6.022x10^{23}particles}\\\\mol=0.0709mol\)

Best regards.

Answer:

Explanation:

A homogeneous mixture consists of one single phase while a heterogeneous mixture consists of two or more phases.

A 50.0 mL solution of 0.250 M HC₂H₃O₂ before and after adding 50 mL of 0.250 M NaOH has a pH of 2.87, the pH changes due to the formation of a buffer solution, which can be calculated using the Henderson-Hasselbalch equation.

This problem requires us to calculate the pH of a buffer solution after the addition of a strong base. A buffer solution is one that resists pH changes when modest amounts of acid or base are added. The buffer system in this case is the weak acid, acetic acid (HC₂H₃O₂) and its conjugate base, acetate ion (C₂H₃O₂-).

Before the addition of NaOH, we have a solution of 0.250 M HC₂H₃O₂, which we can assume to be completely dissociated in water:

HC₂H₃O₂ + H₂O ⇌ H₃O+ + C₂H₃O₂-

HC₂H₃O₂ has a Ka value of 1.8 x 10-5. We can use this Ka value to calculate the equilibrium concentration of H3O+ and C₂H₃O₂- in the solution.

First, we need to calculate the initial concentrations of HC₂H₃O₂ and C₂H₃O₂-.

moles of HC₂H₃O₂ = 0.250 M × 0.0500 L = 0.0125 mol

moles of C₂H₃O₂- = 0 mol (since there is no NaOH added yet)

Since HC₂H₃O₂ is a weak acid, it only partially dissociates in water. The equilibrium concentrations of H₃O+ and C₂H₃O₂- can be calculated using the Ka expression:

Ka = [H₃O+][C₂H₃O₂-]/[HC₂H₃O₂]

We can assume that the initial concentration of H3O+ is negligible compared to the amount that will be produced by the dissociation of HC₂H₃O₂, so we can simplify the expression to:

Ka = [H₃O+]²/[HC₂H₃O₂]

[H₃O+]² = Ka × [HC₂H₃O₂]

[H₃O+]² = 1.8 × 10⁻⁵ × 0.0125

[H₃O+] = 1.34 × 10⁻³ M

Now that we know the equilibrium concentration of H₃O+, we can use the pH formula to calculate the pH:

pH = -log[H₃O+]

pH = -log(1.34 × 10⁻³)

pH = 2.87

This is the pH of the buffer solution before the addition of NaOH.

Next, we add 50 mL of 0.250 M NaOH to the solution. NaOH is a strong base, so it completely dissociates in water to produce OH- ions:

NaOH → Na+ + OH-

The OH- ions will react with the acetate ions in the buffer solution to form water and acetate ions:

OH- + C₂H₃O₂- → H₂O + C₂H₃O₂-

This reaction will consume some of the acetate ions in the buffer solution, causing the equilibrium to shift to the left to produce more acetate ions.

To calculate the new concentrations of H₃O+ and C₂H₃O₂-, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])

where pKa = -log(Ka), [C₂H₃O₂-] is the equilibrium concentration of acetate ions, and [HC₂H₃O₂] is the equilibrium concentration of acetic acid.

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Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

Answer:

4.0389 g

Explanation:

First step is to find how many moles of C11H22O11 12.34 grams is.

12.34 g / 330.11 g/mol = 0.03738 mol

Second, multiply the number of moles by the molar mass of C11

0.03738 mol × (11 × 12.011 g/mol) = 4.0389 g of carbon

Answer:

Calcium atom:
20 protons, 20 electrons
Calcium 2+ ion:
It is a calcium atom but with 2 fewer electrons, so
20 protons,  18 electrons
Oxygen atom:
8 protons and 8 electrons
Oxygen 2- ion:
It is an oxygen atom but with 2 more electrons, so
8 protons, 10 electrons
Calcium oxide:
Add protons and electrons of of Ca with O to get:
20 + 8 protons = 28 protons, 20 + 8 electrons: 28 electrons.
Alternatively, add protons and electrons of Ca{2+} and O{2-} to get the same result.

The correct number of protons and electrons of the given ions are as follows:

The number of protons and electrons in an atom or ion determines the overall charge of the ion or atom.

In a neutral atom, the number of protons and electrons are equal, hence, the overall charge of the atom is 0. However, in a charged atom (ion), the difference between the proton and electron number is the base.

It is important to note that the number of protons is the atomic number of an atom, hence, does not change. However, the number of electrons changes depending on whether electrons are gained or lost.

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Answer:true

Explanation:

Because yea

The pH of the solution of the nitrous acid is 2.04.

We know that we can be able to obtain the pH of the acid when we look at the dissociation of the acid and then we would be able to have that in the dissociation there would be at equilibrium;

             \(HNO_{2}\)(aq)   + \(H_{2} O\)(l)   ⇔ \(H_{3} O^+\)(aq) + \(NO_{2}^-\)(aq)

I           0.20                                     0                 0

C          -x                                           +x               +x

E       0.2 - x                                      x                  x

Then we have;

4.6×10^-4 = x^2/0.2 - x  

4.6×10^-4(0.2 - x) = x^2

9.2 * 10^-5 - 4.6×10^-4x = x^2

x^2 + 4.6×10^-4x - 9.2 * 10^-5  = 0

x=0.009 M

pH = - log(0.009)

pH = 2.04

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Answer:

I don’t mnow

Explanation:

Answer:

Photosynthesis would happen in the plant, while cellular respiration would happen in the plant and the fish. In the plant, photosynthesis occurs when light energy is converted into chemical energy used for growth and development. In fish, cellular respiration occurs when the fish takes in oxygen from the water and uses it to convert energy from food into usable energy...

Explanation:

Answer:

Explanation:

In order to find out the final temperature we use the formula for Charles's law which is

\( \frac{V_1}{T_1} = \frac{V_2}{T_2} \\ \)

where

V1 is the initial volume

T1 is the initial temperature in Kelvin

V2 is the final volume

T2 is the final temperature in Kelvin

Since we are finding the final temperature

\(T_2 = \frac{V_2T_1}{V_1} \\ \)

rom the question

V1 = 5.5 L

T1 = -38°C = -38 + 273 = 235 K

V2 = 1.30 L

We have

\(T_2 = \frac{1.30 \times 235}{5.5} = \frac{305.5}{5.5} \\ = 55.545454...\)

We have the final answer as

Hope this helps you

Answer:

A & C

Explanation:

The next one is A Edge 2022

The compound which are the structural isomers of the given compound is compound A & C.

Structural isomers are those isomers in which which are having the same molecular formula but different structural structures.

Hence A & C are the structural isomers of given compound.

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The options that affect the amount that the freezing point is lowered by the addition of the solute include :

The increasing of a solvent's boiling point as a result of the addition of a solute is known as boiling point elevation. Similar to freezing point depression, adding a solute lowers the freezing point of a solvent. In actuality, a solvent's freezing point drops as its boiling point rises.

Any solvent's freezing point will be lowered by the presence of a solute; this action is known as freezing-point depression. The fact that the solute is present in the liquid solution but not in the pure solid solvent is crucial to understanding this phenomenon.

This includes the compound being ionic or the solubility of the solvent.

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Answer:

Explanation:

The relation between average velocity of a gas molecules and its molecular mass is as follows .

average velocity v

\(v = k \sqrt{\frac{1}{M} }\) where k is a constant .

If v₁ and v₂ be the velocities corresponding to molecular masses 349 and 352 .

\(\frac{v_1}{v_2 } = \sqrt{\frac{M_2}{M_1} }\)

\(\frac{v_1}{v_2 } = \sqrt{\frac{352}{349} }\)

= 1.004

Answer: when product D is removed from the reaction, we should expect a shift of the reaction towards the product's side (shift to the right)

Explanation:

The question requires us to predict the change in the following reaction when the product D is removed:

1A(s) + 2B(l) + heat ↔ 3C (g) + 4D (s)

To solve this problem, we can apply Le Chatelier's principle, which states that changes in temperature, pressure, volume or concentration of reactants/products in a system will result in predictable changes in the system in order to achieve a new state of equilibrium.

According to the Le Chatelier's principle, if we increase the concentration of any reactant in the system, the equilibrium will shift towards the product's side (right shift) in order to consume the "excess" reactant added. In a similar way, if we decrease the concentration of a reactant in the system, the system tends to shift towards the reactant's side (left shift) in order to restabilish the equilibrium.

When we consider the changes in concentration of products we can say that adding more of a product in the system will shift the equilibrium to the reactant's side, while decreasing the concentration of a product will shift the equilibrium to the product's side.

Therefore, when product D is removed from the reaction, we should expect a shift of the reaction towards the product's side (shift to the right).

Answer:

CaO, CaF2, or CaCl2

Explanation:

In an ionic compound, the charges need to balance out. This is the only set of compounds that fits this criteria.

Answer:

CaO CaF2 CaCl2 are ionic

Explanation:

Because electronegativity difference between calcium and other atom is more than 1.7

Step by step solutions:

1 mole of A contains 6.022x10^23 molecules

∴ x moles A contains 5.99x10^23 molecules

Then, moles of A = (5.99x10^23 /6.022x10^23 )molecules

=5.99/6.02

=0.995moles of A Sample

Given that -

Mass = 93.5g

Mol Mass Ammonium carbonate (NH4)2CO3= 96,09 g/mol

∴ moles B = mass /molecular mass

=93.5g /96.09g/mol

=0.973 moles of sample B

Conclusion: Sample A has 0.995 moles, this is bigger that the moles of Sample B that has 0.973 moles.

Answer:I'm going to give some fictitious values just so that we can get some perspective on the matter.

Let's say that the surface temperature of our sun is 10, the surface temp of the bigger star- the red giant formed from leaving the main sequence, has a temp of 0.2. of that- 2.

We can also say that the radius of our sun is 10, and the radius of the red giant is 1000. (100 times more)

Using the equation:

L

=

σ

A

T

4

σ

= The Stefan-Boltzmann constant =

5.67

×

10

−

8

But we can ignore the constant, as we are only interested in a ratio of these values.

L

S

u

n

=

4

π

(

10

)

2

×

10

4

=

1.26

×

10

7

L

S

t

a

r

=

4

π

(

1000

)

2

×

2

4

≈

2.01

×

10

8

2.01

×

10

8

1.26

×

10

8

≈

16

So the newly formed, red giant star is almost 16 times more luminous than the sun. This is owing to the increased surface area of the star due to the massively increased radius.

A small sidenote:

There is an equation that might be useful for comparing the radii, temperature and luminosity of main sequence stars. As red giants are not on the main sequence it could not be used here, but if you stumble across a question where they ask you to find the radius, luminosity or temperature given the other two, you can relate it to the sun's characteristics:

r

s

t

a

r

r

s

u

n

=

√

L

s

t

a

r

L

s

u

n

×

(

T

s

u

n

T

s

t

a

r

)

2

(I know, it's not a beauty to look at- but it works)

Where

X

s

u

n

is the radius, temperature, and luminosity of the sun. These are not often given in numerical values, but this equation serves well when asked to find e.g the radius of a star, in solar radii given that a star is twice as luminous and has 5 times the temperature of that of the sun.

Hence:

T

s

t

a

r

=

5

T

s

u

n

L

s

t

a

r

=

2

L

s

u

n

r

s

t

a

r

r

s

u

n

=

√

2

L

s

u

n

L

s

u

n

×

(

T

s

u

n

5

T

s

u

n

)

2

(cancel the common terms)

r

s

t

a

r

r

s

u

n

=

√

2

×

(

1

5

)

2

r

s

t

a

r

≈

0.057

r

s

u

n

(divide both sides by 0.0057)

17.5

r

s

t

a

r

≈

r

s

u

n

So the star's radius is almost 17.5 times that of the sun.

Hopefully, you find this info useful!

Explanation:

Answer before the 1800s

Explanation:

The validity of documents was marked by fingerprinting before the 1800s.

Fingerprinting means the process of using or collecting one's fingerprints to be used for identification purposes. This means that a person's fingerprints are taken and used as the identity proof of that person.

The emergence of the use of fingerprints as a valid source of one's identity was used from ancient times, from ancient Chinese to the Egyptians. But with the new technological advances, this use was further expanded in the world of criminal forensics which has helped in solving many cases. Thus, the correct answer is the fourth option.

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The concept half life is used here to determine the mass of 'A' remaining after 0.731 min. The rate constant of a reaction is defined as the rate of the reaction when the molar concentration of each of the reactants is unity. The mass of A remaining is 5.163 g.

The half life period of a reaction is defined as the time in which the concentration of a reactant is reduced to half of its initial concentration. The expression for half life period of a first order reaction is:

\(t _{1} /_{2} = 0.693 / k\)

k - rate constant

k = 0.693 / 0.0459 = 15.098 s

Divide by 60 to convert half life into minutes.

15.098 s = 0.251 minutes

The number of half lives that have past is:

0.731 min / 0.251 min = 2.912 ≈ 3

Initial mass / number of half lives = 15.49 / 3 = 5.163 g

Thus the mass of A remaining after 0.731 min is 5.163 g.

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No, 28 moles of solid carbon would not be enough to produce 15 moles of \(C_2H_6\) (Ethane).

This is because the reaction requires more than 1 mole of carbon to produce 1 mole of \(C_2H_6\). The mole ratio of \(C_2H_6\):C is 2:1, so 28 moles of carbon would only be enough to produce 14 moles of \(C_2H_6\).A chemical compound having the molecular formula  \(C_2H_6\), ethane is an organic substance. Ethane is an odourless, colourless gas at ordinary pressure and temperature. Ethane is separated from natural gas on an industrial scale, and it is produced as a by-product of the petrochemical process used to refine crude oil. Its primary usage is as a feedstock for the creation of ethylene.The ethane moiety is known as an ethyl group, and it can be used to create related compounds by swapping out a hydrogen atom for another functional group.

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Answer: b) calcium sulfide

Explanation:

The molar mass of a molecule corresponds to the sum of the atomic weights of each element multiplied by the number of atoms of the respective element. The atomic weights can be found in the periodic table. For each element the atomic weight is:

Cu=63.546u

S= 32.065 u

O4= 15.999u

The molar mass of the molecule will be:

Answer: The molar mass of CuSO4 is 159.607g/mol

Answer:

electrons

Explanation:

Of the three subatomic particles, electrons are most involved in forming chemical bonds.

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, loosing and gaining energy by different phase of water, phases changes.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

When water particles in their gaseous state (X) lose enough energy, then the gaseous state of water converts to liquid state as the kinetic energy of particles decreases. When water particles in their liquid state (Y) gain enough energy, then water converts to vapor state.

Therefore,  loosing and gaining energy by different phase of water, phases changes.

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The error caused will lower the number of moles when he did not do the second heating.This question is related to the empirical formula.

A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

The empirical formula is the simplest ratio of atoms in a given compound.

we know that heating is used to eliminate most of the water molecules which are attached to the compound in the question, it's given that the second heating was not performed by the students.

This means that there are still some water molecules attached to the compound. This will imply that higher mass will be calculated for the compound because the water molecules are also considered.

So now, if we look at the calculation for the number of moles of water in this, we can say that this will be lower than the actual amount.

This is because there are some unaccounted moles of water which are still attached to the compound and these will be accounted in the compound mass rather than the waters. Therefore, the number of moles will be lower.

Hence, The error caused will lower the number of moles when he did not do the second heating.

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Answer:

C.

Explanation:

Hello there!

In this case, according to the given chemical reaction:

\(Pb(NO_3)_2 (aq) + Na_2S(aq) \rightarrow PbS(s) + 2 NaNO_3(aq)\)

We can see that at the end of the reaction solid PbS remain on the bottom of the beaker as it is a precipitate product whereas free sodium and nitrate ions remain in solution as sodium nitrate is an aqueous species. Therefore, the correct diagram would be C.

Best regards!

Among the given diagram, option C best represents the mixture after the reaction has proceeded as completely as possible.

A mixture is a combination of two or more substances which are combined together.

The Balanced equation for the actions:

\(\rm Pb(NO3)_2 (aq) + Na_2S(aq) \rightarrow PbS(s) + 2 NaNO_3(aq)\)

Diagram C shows that the vessel contains the precipitate PbS on the bottom of it whereas the solution contains the remaining ions that are \(\rm Na^+\ and \ NO_3^-\).

Therefore, the correct answer is option. C best represents the mixture.

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