Is a Krypton atom still a Krypton atom if you change the number of neutrons?
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The average atomic mass of the imaginary element : 47.255 amu

The elements in nature have several types of isotopes  

Isotopes are elements that have the same Atomic Number (Proton)  

Atomic mass is the average atomic mass of all its isotopes  

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

isotope E-47 47.011 amu, 87.34%

isotope E-48 48.008 amu, 6.895

isotope E-49 50.009 amu, 5.77%

The average atomic mass :

[tex]\tt avg~mass=0.8734\times 47.011+0.06895\times 48.008+0.0577\times 50.009\\\\avg~mass=41.059+3.310+2.886\\\\avg~mass=47.255~amu[/tex]

Answer:

When  unisotope releases gamma radiation, it does not change the atomic number of the atom .

Explanati

. This is because gamma radiation is the emission of electromagnetic energy from the nucleus in the form of photons, discrete packets of energy.

The Molecular formula of the compound is C₂₀H₂₈O₂

The Molecular formula is determined as follows from the equation of the reaction as follows:

CxHyOz + O₂ → x CO₂ + y/z H₂O

mass of CO₂ produced  = 43.257 g

moles of C in the sample = 43.257/44  = 0.983 moles

mass of C in the sample =  0.983 * 12 = 11.796

mass of H₂O produced  = 12.395 g

moles of H in the sample = 12.395/18 * 2 = 1.377 moles

mass of H in sample = 1.377 g

mass of oxygen in the sample = 14.765 g - (11.796 g + 1.377 g)

mass of oxygen in the sample = 1.598

moles of oxygen = 1.598/16 = 0.0999 moles

Ratio of C : H : O = 0.983 : 1.377 : 0.0999

Ratio of C : H : O = 10 : 14 : 1

Empirical formula of compound = C₁₀H₁₄O

Empirical mass = 150 g

Molecular mass = empirical mass * n

n = molecular mass/empirical mass

n = 300.44/150

n = 2

From the formula;

Molecular formula = (empirical formula)ₙ

Molecular formula = (C₁₀H₁₄O)₂

Molecular formula =C₂₀H₂₈O₂

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Answer: I think the answer is Cesium (Cs)

Explanation:

A half-filled 6s subshell would be 6s^1

Answer:

Avogadro's law (sometimes referred to as Avogadro's hypothesis or Avogadro's principle) is an experimental gas law relating the volume of a gas to the amount of substance of gas present.[1] The law is a specific case of the ideal gas law. A modern statement is:

Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."[1]

For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

The law is named after Amedeo Avogadro who, in 1812,[2][3] hypothesized that two given samples of an ideal gas, of the same volume and at the same temperature and pressure, contain the same number of molecules. As an example, equal volumes of molecular hydrogen and nitrogen contain the same number of molecules when they are at the same temperature and pressure, and observe ideal gas behavior. In practice, real gases show small deviations from the ideal behavior and the law holds only approximately, but is still a useful approximation for scientists.

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Answer : It’s C.

Cccccccccccccccccccccccccccccccccccccccc

The model of the chemical reaction that best represent the law of conservation of mass is the model with a balanced equation.

The correct answer to the question is the third option.

The statement above, suggest that unbalanced equation simply means matter has been created or destroyed.

Therefore, the correct answer to the question given above will be the option in which the equation is balanced.

The option with a balanced equation is the third option.

See attachment photo.

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Answer:

Explanation:

The mass of the football can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{600}{30} = \frac{60}{3} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Sr(OH)₂(aq) + 2 HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + 2 H₂O(l)

Explanation:

Let's consider the unbalanced molecular equation between strontium hydroxide and nitric acid solutions. This is a neutralization reaction, since an acid reacts with a base to form a salt and water.

Sr(OH)₂(aq) + HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + H₂O(l)

We have 2 N atoms on the right side, so we have to multiply HNO₃ by 2.

Sr(OH)₂(aq) + 2 HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + H₂O(l)

Finally, to get the balanced equation we will multiply H₂O by 2.

Sr(OH)₂(aq) + 2 HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + 2 H₂O(l)

The balanced chemical equation can be given as:

[tex]\rm \bold{Sr(OH)_2\;+\;2\;HNO_3\;\rightarrow\;Sr(NO_3)_2\;+\;2\;H_2O}[/tex]

The reaction between strontium hydroxide and nitric acid has been the neutralization reaction. The reaction results in the formation of the salt along with the water molecules.

The reaction can be given as:

[tex]\rm Sr(OH)_2\;+\;HNO_3\;\rightarrow\;Sr(NO_3)_2\;+\;H_2O[/tex]

The balanced chemical equation has been the one in which the number of atoms of each element has been equal on both the product and the reactant side.

The balanced chemical equation can be given as:

[tex]\rm Sr(OH)_2\;+\;2\;HNO_3\;\rightarrow\;Sr(NO_3)_2\;+\;2\;H_2O[/tex]

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Answer:

4.086 × 10⁻¹⁹ J

Explanation:

Step 1: Given and required data

Step 2: Convert "λ" to meters

We will use the conversion factor 1 m = 10⁹ nm.

486.0 nm × 1 m/10⁹ nm = 4.860 × 10⁻⁷ m

Step 3: Calculate the energy of one photon of this light

We will use the Planck-Einstein's relation.

E = h × c / λ

E = 6.626 × 10⁻³⁴ J.s × 2.997 × 10⁸ m/s / 4.860 × 10⁻⁷ m

E = 4.086 × 10⁻¹⁹ J

Answer:

Option D.

2Ag⁺(aq) + Ni(s) —> 2Ag(s) + Ni²⁺(aq)

Explanation:

From the question given above:

Ni(s) —> Ni²⁺(aq) + 2e¯

Ag⁺(aq) + e¯ —> Ag(s)

We can obtain the net ionic equation by combining both equation as shown below:

Ag⁺(aq) + e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

Next, we shall balance the equation. This can be obtained as follow:

Ag⁺(aq) + e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

There are 2 atoms of e¯ on the right side and 1 atom on the left side. It can be balance by putting 2 in front of e¯ as shown below:

Ag⁺(aq) + 2e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

Next, we shall balance the charge on both sides. This is illustrated below:

TOTAL charge on the left = +1 + (–2)

= 1 – 2

= –1

TOTAL charge on the right side = +2 + (–2)

= 2 – 2

= 0

Thus, to balance the charge, put 2 in front of Ag⁺ as shown below:

2Ag⁺(aq) + 2e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

There are 2 atoms of Ag on the left side and 1 atom on the right side. It can be balance by putting 2 in front of Ag as shown below:

2Ag⁺(aq) + 2e¯ + Ni(s) —> 2Ag(s) + Ni²⁺(aq) + 2e¯

Next, cancel out 2e¯ from both side to obtain the net ionic equation. Thus, we have:

2Ag⁺(aq) + Ni(s) —> 2Ag(s) + Ni²⁺(aq)

Answer:

58.0 g/mol

Explanation:

The reaction that takes place is:

First we calculate how many moles of silver chloride were produced, using its molar mass:

Then we convert AgCl moles into MCl₂ moles, using the stoichiometric ratio:

Now we calculate the molar mass of MCl₂, using the original mass of the sample:

We can write the molar mass of MCl₂ as:

Finally we calculate the molar mass of M:

The closest option is 58.0 g/mol.

Answer:

A, it is metal oxide

Answer: omg this is so old! :D but its D!

Explanation:

The cells that has been composed of the indifferent number chromosomes as compared to other cells have been reproductive cells. Thus, option D is correct.

Cells have been the smallest and the unit of life. The cells have been composed of the pairs of chromosomes in higher organisms. There has been the presence of 46 chromosomes i.e. 23 pairs of chromosome. However, the chromosomes in the cell have been diploid i.e. in set of 2.

The reproductive cells have been resulted in the formation of the new cells. So they have been consisted of the cells with the half the number of chromosomes and are haploid in nature.

Thus, the cells that have different number of chromosomes as compared to the other cells have been reproductive cells. Thus, option D is correct.

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The number of moles of Ca(OH)2 formed is 4.33 moles.

Given,

number of moles of H₂O = 4.33

The balanced equation is :

CaO + H₂0 → Ca(OH)₂

From the balanced chemical reaction, we conclude that,

As 1 moles of H₂O  react with 1 mole of Ca(OH)₂

Then, 4.33 moles of H₂O will react with 4.33 moles of H₂O.

Thus, the number of moles of Ca(OH)₂ formed will be 4.33 moles.

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Answer:

none of these

Explanation:

The expression:

      P1/T1 = P2/T2 is a derivative of the combined gas law.

From the combination of the Boyle's and Charles's law, if the volume is taken to be constant, the pressure of the given mass of gas is directly proportional to the absolute temperature.

This is how the expression

      P1/T1 = P2/T2 was obtained.

a. mol O₂=0.5

b. volume O₂ = 25 cm³

c. i. the total volume of the two reactants = 75 cm³

c. ii. the volume of nitrogen dioxide formed = 50 cm³

Reaction

2NO(gas) + O₂(gas) ⇒ 2NO₂ (gas)

a.

mol NO = 1

From the equation, mol ratio NO : O₂ = 2 : 1, so mol O₂ :

[tex]\tt \dfrac{1}{2}\times 1=0.5[/tex]

b.

From Avogadro's hypothesis, at the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles  

Because mol ratio NO : O₂ = 2 : 1, so volume O₂ :

[tex]\tt \dfrac{1}{2}\times 50~cm^3=25~cm^3[/tex]

c.

i. total volume of reactants : 25 cm³+ 50 cm³=75 cm³

ii. the volume of nitrogen dioxide formed :

mol ratio NO : NO₂ = 2 : 2, so volume NO₂ = volume NO = 50 cm³

If you traded (converted) 15 Skittles for M&Ms, you will have 20 M&Ms

We'll begin by converting 15 Skittles to cookies. This can be obtained as follow:

6 Skittles = 4 Cookies

Therefore,

15 Skittles = (15 Skittles × 4 cookies) / 6 skittles

15 Skittles = 10 cookies

We can convert 10 cookies to M&Ms as follow:

1 Cookies = 2 M&Ms

Therefore,

10 cookies = (10 cookies × 2 M&Ms) / 1 Cookies

10 cookies = 20 M&Ms

Thus, 15 Skittles is equivalent to 20 M&Ms

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Answer: You should be able to find the answer on the internet

Answer:

2451.9 ml

Explanation:

M1V1 = M2 V2

M1 = 5.1M

V1 = 125ml

M2=0.26M

V2= ?

V2= M1 V1/M2

V2 = 5.1*125/0.26

V2 = 2451.9 ml

Answer:

273 mL.

Explanation:

From the question given above, the following data were obtained:

Molarity of HBr = 0.220 M

Mole of HBr = 0.060 mole

Volume =?

Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:

Molarity = mole /Volume

With the above formula, we can obtain the volume required as illustrated below:

Molarity of HBr = 0.220 M

Mole of HBr = 0.060 mole

Volume =?

Molarity = mole /Volume

0.220 = 0.060 / Volume

Cross multiply

0.220 × Volume = 0.060

Divide both side by 0.220

Volume = 0.060 / 0.220

Volume = 0.273 L

Finally, we shall convert 0.273 L to millilitres (mL). This can be obtained as follow:

1 L = 1000 mL

Therefore,

0.273 L = 0.273 L × 1000 mL / 1 L

0.273 L = 273 mL

Thus, 0.273 L is equivalent to 273 mL.

From the calculations made above, 273 mL of HBr is required.

The volume of 0.220 M HBr solution (in mL) required to obtain 0.060 moles of HBr is 272.7mL

From the question,

We are to determine the volume of 0.220M HBr solution that is required to obtain 0.060 moles of HBr.

To determine this, we will use the formula connecting number of moles, concentration and volume

From the formula,

Number of moles = Concentration × Volume

Then,

[tex]Volume = \frac{Number \ of \ moles}{Concentration}[/tex]

From the question,

Concentration of the HBr solution = 0.220 M

Required number of moles of HBr = 0.060 moles

∴ [tex]Volume \ of \ HBr \ required = \frac{0.060}{0.220}[/tex]

Volume of HBr required = 0.272727 L

Now, we will convert this to milliliter (mL)

(NOTE: 1L = 1000 mL)

∴ 0.272727 L = 0.272727 × 1000 mL

= 272.727 mL

≅ 272.7 mL

Hence, the volume of 0.220 M HBr solution (in mL) required to obtain 0.060 moles of HBr is 272.7mL

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Answer:

paleontologist is the best i can say you

Explanation:

it b

....

hope it helps!

Answer:

[tex]435.18\ cm^3[/tex]

Explanation:

[tex]From\ the\ measurements\ by\ the\ caliper,\\The\ length\ of\ the\ cube=6.8\ cm\\The\ breadth\ of\ the\ cube=6.83\ cm\\The\ height\ of\ the\ cube=9.37\ cm\\Hence,\\As\ we\ know\ that\ Volume\ of\ the\ cuboid=lbh\\Hence,\\Volume\ of\ the\ cube=6.8*6.83*9.37\\Volume\ of\ the\ cube=435.18\ cm^3\\[/tex]

Answer:

Try to go to quizzlet

Explanation:

Answer:

j

Explanation:

Answer:

Radiation, because the element of the heater comes in contact with air in the room. Convection, because energy is carried by waves and not matter. Radiation, because heat travels in a cyclical manner.

Explanation:

Answer:

Radiation,

Explanation:

Answer:

The radius of the atom Ta is 142pm

Explanation:

To solve this question we need to know that for a body-centered cubic lattice we have the equations:

X = 4/√3 R

Where X is edge length and R is radius of the atom in the lattice.

If adge length of unit cell is 328 pm:

328pm = 4/√3 R

328pm * √3 / 4 = R

142pm = R

The radius of the atom Ta is 142pm

Answer:

Q = 100.42 J

Explanation:

Given data:

Mass of water = 1.500 g

Specific heat capacity of water = 4.184 J/g.°C

Heat required = ?

Initial temperature = 23°C

Final temperature = 39°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 39°C - 23°C

ΔT = 16°C

Q = 1.500 g× 4.184 J/g.°C  ×16°C

Q = 100.42 J

Answer:

C10H200

Explanation:

The molecular formula C10H20O (molar mass : 156.27 g/mol) may refer to: Citronellol. Decanal.

The molar mass of menthol ([tex]\rm C_10H_{20}O[/tex]) is 156.3 g/mol.

To calculate the molar mass of menthol ([tex]\rm C_10H_{20}O[/tex]), we need to determine the sum of the atomic masses of all the individual atoms in the compound.

The atomic masses of the elements are as follows:

C (carbon) = 12.01 g/mol

H (hydrogen) = 1.01 g/mol

O (oxygen) = 16.00 g/mol

Now, let's calculate the molar mass of menthol:

Molar mass of menthol = (10 * molar mass of C) + (20 * molar mass of H) + (1 * molar mass of O)

                      = (10 * 12.01 g/mol) + (20 * 1.01 g/mol) + (1 * 16.00 g/mol)

                      = 120.1 g/mol + 20.2 g/mol + 16.0 g/mol

                      = 156.3 g/mol

Therefore, the molar mass of menthol ([tex]\rm C_10H_{20}O[/tex]) is 156.3 g/mol.

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Answer: 36.3 ml

Explanation:

According to the neutralization law,

[tex]n_1M_1V_1=n_2M_2V_2[/tex]

where,

[tex]n_1[/tex] = basicity [tex]H_2SO_4[/tex] = 2

[tex]M_1[/tex] = molarity of [tex]H_2SO_4[/tex] solution = 0.51 M

[tex]V_1[/tex] = volume of  [tex]H_2SO_4[/tex] solution = ?

[tex]n_2[/tex] = acidity of [tex]KOH[/tex] = 1

[tex]M_1[/tex] = molarity of [tex]KOH[/tex] solution = 0.36 M

[tex]V_1[/tex] = volume of  [tex]KOH[/tex] solution = 103 ml

Putting in the values we get:

[tex]2\times 0.51\times V_1=1\times 0.36\times 103[/tex]

[tex]V_1=36.3ml[/tex]

Therefore, volume of [tex]H_2SO_4[/tex] required is 36.3 ml

As that liquid water is further heated, it evaporates and becomes a gas—water vapor.

When a liquid transitions from the liquid phase to the gas phase, evaporation, a sort of vaporization, takes place on the liquid's surface. High concentrations of the evaporating substance in the surrounding gas considerably slow down evaporation, as is the case when humidity impacts the rate of water evaporation.

The way that the liquid's molecules clash determines how much energy is transferred to one another. In order to leave and enter the surrounding air as a gas, a molecule close to the surface must absorb enough energy to outperform the vapor pressure. Evaporative cooling is the process of reducing a liquid's temperature as a result of evaporation, which removes energy from the evaporated liquid.

The majority of the liquid's molecules only hold a small portion of the heat energy needed.

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