A balloon contains 10.0 g of helium gas. If the initial volume is V, and the temperature
and pressure are held constant, what is the final volume (in terms of V) after 10.0 g
of neon is added?

Electrons are emitted from the surface of a metal in photoelectric effect.

The photoelectric effect is the emission of electron from the surface of a metal when light is shone on the surface..

For electrons to be emitted, the light must have a certain frequency known as threshhold frequency.

Therefore, electrons are emitted from the surface of a metal in photoelectric effect.

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[tex]\huge\boxed{\textsf{Li and Ca}}[/tex]

An element is a substance that can't be broken down further. Lithium (Li) and calcium (Ca) are examples of elements.

Carbon monoxide (CO) and potassium bromide (KBr) are examples of compounds, which are made up of more than one element put together.

Answer:

C

Explanation:

Answer:

The awnser is C: it tells you how much of a molecule IS up of each element.

Taking into account the reaction stoichiometry, 12.857 grams of Li₂O are formed when 6 grams of Li reacts.

In first place, the balanced reaction is:

4 Li + MnO₂  → 2 Li₂O + Mn

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 28 grams of Li form 60 grams of Li₂O, 6 grams of Li form how much mass of Li₂O?

[tex]mass of Li_{2} O=\frac{6 grams of Lix60 grams of Li_{2} O}{28 grams of Li}[/tex]

mass of Li₂O= 12.857 grams

Finally, 12.857 grams of Li₂O are formed when 6 grams of Li reacts.

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Answer:

synthesis/combination

Explanation:

There are 5 main types of reactions.

combination/synthesis, decomposition, single-replacement, double-replacement, and combustion

synthesis/combination -  A+B → AB

Decomposition - AB → A+B

single- replacement - A + BC → AC + B

double replacement - AB + CD → AD + CB

combustion - example - C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

If you wanted to balance this

the answer would be [tex]C + 2H_{2}[/tex] → [tex]CH_{4}[/tex]

Answer: The concentration of the diluted solution is 0.17M.

Explanation:

The equation for diluted solutions is shown as: [tex]M_{s} V_{s} =M_{d} V_{d}[/tex].

~M= Molarity (labeled as M)

~V=Volume (in L)

~s= stock solution (what you started with)

~d= diluted solution (what you finish with)

Now that we have that down, let's plug in our data!

[tex]0.718M*17.6mL=M_{d} *73.3mL[/tex]

(I put [tex]V_{d}[/tex] as 73.3 because you are adding 55.7mL to 17.6mL, meaning that you have to add that to get [tex]V_{d}[/tex]. In other words, [tex]17.6mL+55.7mL=73.3mL[/tex])

There is a little problem here though. The volume is not in liters. But no worries, we can just convert it by dividing it by 1000.

[tex]17.6mL/1000=0.0176L[/tex]     [tex]73.3mL/1000=0.0733L[/tex]

Now that we have both volumes in liters, we can plug them in correctly.

[tex]0.178M*0.0176L=M_{d} *0.0733L[/tex]

[tex]M_{d} =\frac{0.718M*0.0176L}{0.0733L}[/tex]     [tex]M_{d} =0.17M[/tex]

With all of this shown, we now know that the concentration of the diluted solution is 0.17M.

I hope this helps! Pls mark brainliest!! :)

Answer:

0.000000025

Explanation:

[H+]=10^-pH

Answer:

2.5 10^-8

Explanation:

The pressure exerted by the nitrogen is 718 mmHg.

The oxygen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components

The vapor pressure of water at that temperature is approximately 17mmHg.

P total = P oxygen + P water

P oxygen = 735 mmHg − 17mmHg

P oxygen = 718 mmHg

Vapor pressure or equilibrium vapor pressure is described as the strain exerted by way of a vapor in thermodynamic equilibrium with its condensed levels at a given temperature in a closed gadget. The equilibrium vapor stress is an indication of a liquid's evaporation price.

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The New Volume is 5.4L

Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law (particularly in France), is an experimental gas law that explains how a gas's pressure tends to drop as the capacity of the container increases.

A current formulation of Boyle's law is:

If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.

Boyle's law can be expressed mathematically as either PV = k or P 1/V (Pressure is inversely proportional to volume) (Pressure multiplied by volume equals some constant k)

P1V1 = P2V2

P1 = 242

V1 = 27

P2 = 1210

V2 = (242*27)/1210

V2 = 5.4L

Hence the New Volume V2 is 4.5L

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25.54 g of diethyl ether would you obtain from 41.8 g of ethyl alcohol if the per cent yield of the reaction is 76.6 %.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Step 1: Write the balanced equation

2 CH₃CH₂OH ⇒ CH₃CH₂OCH₂CH₃ + H₂O

Step 2: Calculate the moles corresponding to 41.8 g of CH₃CH₂OH

The molar mass of CH₃CH₂OH is 46.07 g/mol.

41.8 g × 1 mol ÷ 46.07 g = 0.90.

Step 3: Calculate the theoretical moles of CH₃CH₂OCH₂CH₃ produced

The molar ratio of CH₃CH₂OH to CH₃CH₂OCH₂CH₃ is 2:1. The moles of CH₃CH₂OCH₂CH₃ theoretically produced are 1/2 × 0.90 mol = 0.45

Step 4: Calculate the real moles of CH₃CH₂OCH₂CH₃ produced

The percent yield of the reaction is 85%.

0.45 mol × 76.6% = 0.3447 mol

Step 5: Calculate the mass corresponding to  0.3447 moles of CH₃CH₂OCH₂CH₃

The molar mass of CH₃CH₂OCH₂CH₃ is 74.12 g/mol.

34.47 mol × 74.12 g/mol = 25.549164 g

Hence, 25.54 g of diethyl ether would you obtain from 41.8 g of ethyl alcohol if the per cent yield of the reaction is 76.6 %.

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The pKa of the acid is 4.05

Calculation of pKa:

pKa tells about the strength of acidic molecule.

[tex]pK_{a}= -log[K_a][/tex]

Where Ka is the dissociation constant of an acid.

According to Henderson-Hasselbalch equation:

[tex]pH= pK_{a} + log\frac{[salt]}{[acid]} \\[/tex]

pH= 4.41

Concentration of acid= 0.32M

Concentration of salt= 0.14M

Putting the values in the equation,

[tex]4.41= pK_{a} + log\frac{0.32}{0.14}\\\\4.41= pK_{a} + 0.36\\\\pK_{a}= 4.41 - 0.36\\pK_{a}= 4.05[/tex]

The pKa of the acid is 4.05.

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The group of atoms that is responsible for the characteristic properties of a family of organic compounds is called a functional group.

Functional groups are groups of one or extra atoms with exclusive chemical homes regardless of what's connected to them. The atoms of practical agencies are certain via covalent bonds with one another and with the relaxation of the molecule.

Functional groups include:

An atom or institution of atoms that replaces hydrogen in a natural compound that defines the shape of a family of compounds and determines the properties of the family.

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Answer:

3.5 yrs

Explanation:

If a sample has decayed to 25%, this means 2 half-lives have passed. We are given this is equal to 7 yrs, and it follows that one half life is 3.5 yrs.

Answer:

0.86 moles H₂O

Explanation:

To solve this problem, it is important to first determine the balanced chemical equation. The balanced equation is necessary as it will provide the mole-to-mole ratio needed to convert between moles O₂ and moles H₂O.

The unbalanced equation:

C₈H₁₈ (l) + O₂ (g) ---> CO₂ (g) + H₂O (g)

Reactants: 8 carbon, 18 hydrogen, 2 oxygen

Products: 1 carbon, 2 hydrogen, 3 oxygen

As you can see, the equation is not balanced because there are unequal amounts of each element on both sides. Balancing the equation is a matter of guessing-and-checking to see which combination of coefficients work.

The balanced equation:

2 C₈H₁₈ (l) + 25 O₂ (g) ---> 16 CO₂ (g) + 18 H₂O (g)

Reactants: 16 carbon, 36 hydrogen, 50 oxygen

Products: 16 carbon, 36 hydrogen, 50 oxygen

Now that the equation is balanced, we can use the coefficients of O₂ and H₂O to construct our mole-to-mole ratio and perform our conversion. The final answer should have 2 sig figs to match the given value (1.2 moles). The state of matter is most likely not necessary to include in your final answer.

1.2 moles O₂          18 moles H₂O
---------------------  x  -----------------------  =  0.86 moles H₂O
                                25 moles O₂

Answer:

Al(OH)₃ + 3 HCl ----> AlCl₃ + 3 H₂O

Explanation:

In a double-displacement reaction, the cation of one compound is swapped with the cation of another. The basic structure of these reactions is:

AB + CD ----> AD + CB

In this reaction, the aluminum (Al) of Al(OH₃) is replaced by the hydrogen (H) of HCl, and vice versa.

The first resulting compound is AlCl₃. The chlorine has a subscript of 3 in order to eliminate the +3 charge from the Al cation (+3 + 3(-1) = 0). The second resulting compound is HOH, most commonly written as H₂O. There needs to be a coefficient of 3 in front of H₂O to balance the equation.

The complete balanced equation is:

Al(OH)₃ + 3 HCl ----> AlCl₃ + 3 H₂O

163.1 KJ of heat flows into the gas.

As the pressure is constant, then it is a isobaric process.

In this process , Heat flows is [tex]Q=nC_{p}[/tex]ΔT

Work done is represented by W = PΔV= nRΔT

γ for monoatomic gas is [tex]\frac{5}{3}[/tex]

So, their ratio is

[tex]\frac{W}{Q}[/tex] = [tex]\frac{R}{C_{P} }[/tex] =  R/γR/γ-1 = [tex]\frac{2}{5}[/tex] ….. (1)

Hence, Ratio of W and Q is 2/5

Now given,

Pressure = 233 kPa = 233000 Pa

ΔV= 0.76-0.48 = 0.28[tex]m^{3}[/tex]

So, W = PΔV = 233000 × 0.28 = 65240J

From equation (1)

[tex]\frac{65240}{Q} =\frac{2}{5}[/tex]

Q = 163100J or 163.1 KJ

As the value of Q is positive so, 163.1 KJ of heat flows into the gas.

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​

Answer:

I am sorry

Explanation:

From the reactions, 1.04 g of H2 and 7.995 g of aluminum phosphate is produced.

The term stoichiometry has to do with the amount of substances that participates in a reaction.

For reaction 1;

Mg + 2HCl → MgCl₂ + H₂

Number of moles of Mg reacted =  12.5 g/24g/mol = 0.52 moles

If 1 mole of Mg produced 1 mole of H2

0.52 moles produces 0.52 moles of H2

Mass of H2 =  0.52 moles * 2 g/mol = 1.04 g

For reaction 2;

2Li3PO4 + Al2(SO4)3 → 3Li2SO4 + 2AIPO4

Number of moles of lithium phosphate =  7.5 g/116 g/mol = 0.065 moles

2 moles of Li3PO4 produced 2 moles of AIPO4

0.065 moles of  Li3PO4 produced 0.065 moles of AIPO4

Mass of AIPO4  = 0.065 moles  * 123 g/mol = 7.995 g

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If metals are deposited in streambeds placer mining would probably be used. spoil bank mining open-pit mining placer mining strip mining underground mining

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The answers are as follows;

3 - 4.95 atm

4 - 539 L

5 - 4 L

The gas laws are used to establish the relationship between the pressure, volume, number of moles etc of a gas.

3.

V1 = 1.50 L

V2 = 0.50 L

P1 = 1.65 atm

P2 = ?

P1V1 = P2V2

P2 = P1V1 /V2

P2 = (1.50)(1.65) / (0.50)

P2 = 4.95 atm

4.

P1V1 = P2V2

P1 =  760 mm Hg

V1 = 200.0 L

P2 = 282 mm Hg

V2 = ?

V2 = P1V1/P2

V2 = 760 mm Hg * 200.0 L/282 mm Hg

V2 = 539 L

The volume of the gas increases because the pressure decreases.

5.

Using

V1/T1 = V2/T2

V1T2 =V2T1

V2 = V1T2/T1

V2 = 3.00 L * 373 K/ 273 K

V2 = 4 L

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The main difference between the waters of Kerala and Himachal Pradesh is the presence of water lakes, and ponds in Kerala and the Himalayan Ranges and Rivers in Himachal Pradesh

The main difference between the soil of Kerala and Himachal Pradesh is that there is the presence of mountain soils in Himachal Pradesh, while Kerala has coastal allu-vium, mixed allu-vium, and acid saline, Kari, laterite, red, hill, black cotton, and forest soils.

This refers to the side-by-side view of two or more entities in order to find their differences and similarities.

Hence, we can see that Kerala and Himachal Pradesh are both in India and they are in different regions, which accounts for their differences in water and soil as listed above.

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Answer:

a. name of element is copper it's proton is 29 neutron is 34 and electron is 29

b.name of element is sodium it's proton is 11 neutron is 12 and electron is 11

c.name of element is chlorine it's proton is 17 neutron is 18 and electron is 17

d.name of element is iron it's proton is 26 neutron is 30 and electron is 26

It will take 0.012 year to reach the top of the pile of balls.

Given:

height of the pile = 1.10 x 10¹⁴km = 1.10 x 10¹⁷m

speed of light = 3.00 x 10⁸ m/s

Time = distance / speed

=  1.10 x 10¹⁴m /  3.00 x 10⁸ m/s

= 3.67 x 10⁸ s

= 0.012 year

Therefore, the time taken for the object to reach to top of pile is 0.012 year.

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Considering the definition of pH, the pH is 1.36 and since it is lower than 7, the solution is acidic.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= - log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, a solution has a [H₃O⁺] concentration of 4.32×10⁻² M. You can replace this value in the definition of pH:

pH= -log (4.32×10⁻² M)

Solving:

pH= 1.36

Finally, the pH is 1.36 and since it is lower than 7, the solution is acidic.

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I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.

A compound is formed by the combination of atoms. It is important to note that the same atoms can be combined in different ways to produce new compounds.

I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.

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69 gram PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now we have to write the balanced equation

P₄ + 10Cl₂ → 4PCl₅

To calculate the number of moles used the formula

Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar mass}}[/tex]

Number of moles of P₄ = [tex]\frac{\text{Mass of}\ P_4}{\text{Molar mass of}\ P_4}[/tex]

                                       = [tex]\frac{28\ g}{124\ g/mol}[/tex]

                                       = 0.225 mol

Number of moles of Cl₂ = [tex]\frac{\text{Mass of}\ Cl_2}{\text{Molar mass of}\ Cl_2}[/tex]

                                        = [tex]\frac{51\ g}{71\ g/mol}[/tex]

                                        = 0.831 mol

From the balanced chemical equation we can say that the ratio of P₄ and Cl₂ is 1 : 10.

Ratio of P₄: 0.2260: 1  = 0.2260

Ratio of Cl₂:  0.8310: 10 =  0.08310

Because ratio of Cl₂ ratio smaller than P₄ becomes the limiting reactants

So mole of PCl₅ is based on mole of Cl₂

From the coefficient of reaction:

mol PCl₅: mol Cl₂ = 4: 10

Mole of PCl₅ = [tex]\frac{4}{10} \times 0.8310[/tex]

                     = 0.3324

Molar mass of PCl₅= 208.5

Mass of PCl₅ = mole × molar mass

Mass of PCl₅ = 0.3324 × 208.5

Mass of PCl₅ = 69 gram

Thus from the above conclusion we can say that 69 gram PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: What mass of PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂ ?

69.3 gram PCl₅ will be produced from the given masses of both the reactants.

Balanced chemical equation is

P₄ + 10Cl₂ → 4PCl₅

Four moles of PCl₅ are produced by combining one mole of P₄ with ten moles of chlorine.

Given mass of P₄ = 28gm

Molecular mass of P₄ = 123.89 g/mole

No. of moles(P₄) = Given mass / Molar mass

                            =28/123.89 =0.226 moles …. (1)

Given mass of Cl₂ = 59gm

Molecular mass of Cl₂ = 70.906 g/mole

No. of moles of Cl₂ = 59/70.906 = 0.832 mole.... (2)

From the chemical equation

Ratio of moles of P₄ and Cl₂ is 1 : 10

Also, from equation (1) & (2)

Ratio of moles of P₄ and Cl₂ is 0.226 : 0.832

If we make the ratio 1 : 1 then,

Ratio of moles of P₄ and Cl₂ becomes 0.226 : 0.0832

As the ratio of moles of Cl₂  is less than moles of P₄ , So Cl₂ becomes the limiting reactant.

Hence,  mole of PCl₅ can be estimated on the basis of moles of Cl₂

From the coefficient of reaction:

mole of  PCl₅ : mole of Cl₂ = 4: 10

10 moles of Cl₂ produce 4 moles of PCl₅

O.832 moles of Cl₂ produce 0.3328 moles of PCl₅

Molecular mass of PCl₅= 208.5 g/mole

Mass of PCl₅ = No. of moles × molar mass

Mass of PCl₅ = 0.3328 × 208.5

Mass of PCl₅ = 69.3 gram

Thus from the above conclusion we can say that 69.3 gram PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂.

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Answer:

False

Explanation:

Forms of a given element that have a different number of neutrons are called isotopes.

The ideas held by the ancient Greeks have been at least partially supported by scientific experiments include:

This is a phenomenon in which a quantum entity can be referred to as a wave or a particle.

An example is light which has this feature and has been severally proven through series of experiments such as photoelectric effects etc.

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The energy for the transition:

The energy for the transfer of an electron from the n=2 level to the n=5 level of a hydrogen atom is 4.57 x [tex]10^{-19}[/tex] J

Calculation:

We are aware of the energy levels as n=2 and n=5. So, we may determine the wavelength of the photon released by the electron during this transition using Rydberg's equation:

1/λ = R x (1/[tex]n^{2}[/tex][tex]_{final}[/tex] - 1/[tex]n^{2} _{initial}[/tex])

where,

1/λ = the wavelength of the emitted photon,

R = Rydberg's constant, 1.0974 x [tex]10^{7} m^{-1}[/tex]

[tex]n_{final}[/tex] = the final energy level = 5

[tex]n_{initial}[/tex] = the initial energy level = 2

Now, put the value in the above equation, we get,

1/λ = 1.0974 x [tex]10^{7} m^{-1}[/tex] x ( 1/[tex]5^{2}[/tex] - 1/[tex]2^{2}[/tex] )

1/λ = 1.0974 x [tex]10^{7}[/tex][tex]m^{-1}[/tex] x (-0.21)

1/λ = -0.23 x [tex]10^{7}[/tex][tex]m^{-1}[/tex]

λ = 4.347 x [tex]10^{-7}[/tex]m

Since, E = hc/λ

where,

h = Plank's constant = 6.626 x [tex]10^{-34}[/tex] Js

c = speed of light = 3 x [tex]10^{8}[/tex] m/s

So, the transition energy for your particular transition is,

E = 6.626 x [tex]10^{-34}[/tex] x 3 x [tex]10^{8}[/tex] / (4.347 x [tex]10^{-7}[/tex])

E = 4.57 x [tex]10^{-19}[/tex] J

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