What is an expression of Boyle's law (k = constant)?
A. V/T=K
B. V = kn
C. PV = k
D. Ptotal= P₁ + P₂ + P3 + &

Answer:

0.436 ⇒ 0.44

9.000 ⇒ 9.0

Concept:

Significant figures are where each of the digits of a number are used to express it to the required degree of accuracy, starting from the first nonzero digit.

Therefore, in the context of this question, two significant figure means that two digits of numbers are kept, from left to right, starting from the first nonzero digit.

Solve:

0.436 has 3 significant digits in total starting from left to right

Thus, the last digit should be rounded up / down

Since the last digit is 6, it is greater than 5, so it should be rounded up.

Therefore, a rounded 0.436 is [tex]\Large\boxed{0.44}[/tex]

9.000 has 4 significant digits in total starting from left to right

Thus, the last two digits should be rounded up / down

Since the last two digits are 0, it is less than 5, so it should be rounded up (or remained).

Therefore, a rounded 9.000 is [tex]\Large\boxed{9.0}[/tex]

Hope this helps!! :)

Please let me know if you have any questions

Answer:

5 g / ml

Explanation:

Convert the values given to   g   and ml

12.5 kg = 12500 g

2.5 L = 2500 ml

12500 g / 2500 ml = 5 g/ml

Explanation:

we can use the "ideal gas law" :-

PV = nRT

p :- pressure ( pa )

V :- Volume ( m³ )

n :- amount of substance ( mol )

R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )

T :- Temperature ( K)

The likely thing which will occur when an atom of this element 1s²2s²2p6 3s¹ comes near an atom having seven valence electrons is what is referred to as electrovalent bonding.

This is also referred to as ionic bonding and involves the transfer of atoms from one element to another. This is done so as to ensure that an octet configuration is achieved.

The element 1s²2s²2p6 3s¹  is Sodium and will undergo ionic bonding with the chlorine. One valence electron is transferred from the sodium to the chlorine which makes them stable.

This is therefore the reason why electrovalent bonding will most likely between the two elements.

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Answer:

2 Al and 3 S

Explanation:

Al2S3 so 2 Al and 3 S

The equilibrium constant of the reaction is 76176.

In chemistry, the equilibrium constant is used to show the extent to which we can convert reactants to products in a given chemical process. A large value of the equilibrium constant shows that most of the reactants are converted into products under the given conditions. A small value of the equilibrium constant shows that most of the reactants are not converted into products.

Thus, if we have the reactions;

(1) 1/2 X2(g) + 1/2 Y2(g) ↔ XY(g)

(2) 2XY(g) ↔ X2(g) + Y2(g)

It then follows that;

K1 = [XY]/[X2]^1/2 [Y2]^1/2

K2 =  [XY]^2/[X2] [Y2]

It is clear that;

K2 = (K1)^2

K2 = (276)^2

K2 = 76176

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C. The average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv.

X-rays are a form of electromagnetic radiation, similar to visible light used for medical treatment and other forms of x ray inspection.

An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation.

The average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv or 2.4 m u Sv.

Thus, the average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv.

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From the calculation, the partial pressure of Cl2 is 1.98 atm. Option B

The term equilibrium constant refers to the value that shows us the extent to which reactants are converted into products. We know that the equilibrium constant can only be obtained by the use of the equilibrium partial pressures of each of the species.

Thus we have;

K = p PCl3 . pCl2/pPCl5

p PCl3 = partial pressure of PCl3

pCl2 = partial pressure of Cl2

pPCl5 = partial pressure of PCl5

K = equilibrium constant

Substituting values;

1.05 =  0.463 *  pCl2/0.875

 pCl2 = 1.05  * 0.875/0.463

pCl2 = 1.98 atm

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The environmental conditions of the ocean are:

In our oceans, there are known to be a lot of environmental conditions that are known to often affect the growth, survival and also the productivity of marine organisms. These are the ones listed above.

Note that the increased concentration of chemicals, e.g.  nitrogen and phosphorus is one that can be harmful to marine life.

Hence, The environmental conditions of the ocean are:

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Answer:

1.) ⁴₂He

2.) ⁶₂He

3.) ²⁴²₉₄Pu

4.) ¹₀n

Explanation:

The superscript represents the mass number, which is the total amount of protons and neutrons in an element.

The subscript represents the atomic number, which is the total amount of protons in an element.

You can identify the element based on the atomic number. For instance, all atoms with a subscript/atomic number of 2 must always be helium (He). An element with an atomic number of 0 is represented by the symbol "n". The mass number and atomic numbers must be equal on both sides of the reaction.

1.) ¹₁H + ³₁H  → ⁴₂He

    -----> Mass Number: 1 + 3 = 4

    -----> Atomic Number: 1 + 1 = 2

2.) ⁹₄Be + ¹₁H → He + ⁶₂He

    -----> Standard helium (He) has a mass number of 4 and an atomic number of 2

    -----> Mass Number: 9 + 1 - 4 = 6

    -----> Atomic Number: 4 + 1 - 2 = 2

3.) ²³⁹₉₂U + ⁴₂He →  ²⁴²₉₄Pu + ¹₀n

    -----> Mass Number: 239 + 4 - 1 = 242

    -----> Atomic Number: 92 + 2 - 0 = 94

4.) ²⁷₁₃Al + ¹₀n → ²⁴₁₁Na + ⁴₂He

    -----> Mass Number: 24 + 4 - 27 = 1

    -----> Atomic Number: 11 + 2 - 13 = 0

Answer: Lithium - 8

Answer:

Lithium-8

Explanation:

The atom with three protons and five neutrons that has a mass number of eight is known as lithium-8.

The answer is [OH⁻] = 1 x 10⁻⁴.

[OH⁻] = H₂O ÷ [H₃O⁺]

[OH⁻] = 1 x 10⁻¹⁴ / 1 x 10⁻¹⁰

[OH⁻] = 10⁻⁴

answer = 9.96x10^-3

I hope that help you

The structure of isocynide is

N=C

What is the importance of VSEPR theory?

Valence bond theory describes the electronic structure of molecule .The theory says that electrons fills the atomic orbitals of an atom within a molecule .

In the structure of isocynide there are triple bonds between Nitrogen and carbon . The bond length is 115.8pm and the bond angle is 180°. There is two pi and one sigma bond .

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The structure of isocynide is H--N=C

Valence bond (VB) theory is a chemical bonding theory that describes the chemical bonding between two atoms. Like molecular orbital (MO) theory, it explains sticking using principles of quantum mechanics. According to valence bond theory, sticking is caused by the overlapping of half-filled atomic orbitals.

Valence Bond theory represents covalent bond formation as well as the electronic form of molecules. The theory assumes that electrons inhabit atomic orbitals of individual atoms within a molecule, and that the electrons of one atom are drawn to the nucleus of another atom.

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Answer:

445 mL NH₄Br

Explanation:

(Step 1)

Convert grams ammonium bromide (NH₄Br) to moles using its molar mass.

Molar Mass (NH₄Br): 14.007 g/mol + 4(1.008 g/mol) + 79.904 g/mol

Molar Mass (NH₄Br): 97.943 g/mol

8.42 grams NH₄Br                1 mole
-----------------------------  x  ------------------------  =  0.0860 moles NH₄Br
                                         97.943 grams

(Step 2)

Calculate the volume of NH₄Br using the molarity equation. Then, convert liters (L) to milliliters (mL).

Molarity (M) = moles / volume (L)

0.193 M = 0.0860 moles / volume

(0.193 M) x volume = 0.0860 moles

volume = 0.445 L

1,000 mL = 1 L

0.445 L NH₄Br           1,000 mL
------------------------  x  ------------------  =  445 mL NH₄Br
                                        1 L

[tex] \large \underline{ \boxed{ \tt \red{Pounds \: per \: square \: inch}}}[/tex]

[tex] \: \: \: [/tex]

( PSI ) is a measurement of pressure in the Imperial system of measurement.

[tex] \: \: \: [/tex]

hope helps ~

Answer:

D. Convert the 0.2 kg of NaCl to moles of NaCl

Explanation:

The molality equation looks like this:

Molality = moles of solute / mass (kg) of solvent

In this case, the solute is NaCl and the solution is water. So, if you have been given NaCl in kg, you need to convert it to grams and then to moles in order to plug it into the equation.

Answer:

2.52 g NaCl

Explanation:

(Step 1)

To find the mass, you first need to find the moles NaCl. This value can be found using the molarity ratio:

Molarity = moles / volume (L)

After you convert mL to L, you can plug the given values into the equation and simplify to find moles.

136.9 mL / 1,000 = 0.1369 L

Molarity = moles / volume

0.315 M = moles / 0.1369 L

0.0431 = moles

(Step 2)

Now, you can use the molar mass to convert moles to grams.

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

0.0431 moles NaCl           58.443 g
------------------------------  x  -------------------  =  2.52 g NaCl
                                            1 mole

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C₁₂H₂₂O₁₁

1 )

Molar mass = 12 x 12 + 22 x 1 + 11 x 16

= 144 + 22 + 176

= 342 g

2 )

100 mL of 1.0 M will contain 1.0 x0.100 = .1 mole of sucrose

0.1 mole of sucrose = 0.1 x 342 g = 34.2 g of sucrose.

So , mass of sucrose required is 34.2 g .

3 )

100 mL of .5 M sucrose = .100 x .5 mole of sucrose

= .05 mole of sucrose

.05 mole of sucrose = .05 x 342 g = 17.1 g of sucrose .

So , mass of sucrose required is 17.1 g .

The correct IUPAC name of the following structure CH2=CH2-CH-CH3 is But - 1 - ene

Hence the structure CH2=CH-CH2-CH3 is named on the basis of the above rule as but - 1 - ene.

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Answer:

Co2

Explanation

An organic compound includes Carbon and Hydrogen both bonded

The concentration of carbon monoxide at equilibrium is 0.209 M.

CO2 = 2 mol/5 L = 0.4

H2 = 1.5 mol/5L = 0.3

Create ICE table as shown below

        CO2(g)    +     H2(g) ↔       CO(g)    +     H2O(g)

I          0.4               0.3                0                  0

C        - x                 - x                 x                   x

E        0.4 - x           0.3 - x           x                   x

Kc = [CO][H₂O] / [CO₂][H₂]

2.5 = (x²)/(0.4 - x)(0.3 - x)

x² = 2.5(0.4 - x)(0.3 - x)

x² = 2.5(0.12 - 0.7x + x²)

x²  = 0.3 - 1.75x + 2.5x²

0 = 1.5x² - 1.75x + 0.3

solve the quadratic equation using formula method;

x = 0.209

Thus, the concentration of carbon monoxide at equilibrium is 0.209 M.

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Answer: Iron

Explanation: IRON : Iron is an element with symbol Fe and atomic number 26 2) it is the fourth most common element in earth's crust 3) It is a heavy silvery grey metal belongs to the first transition series. 4) High ductility and malleability 5) It is a good conductor.

The identity of the substance is Iron.

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Answer:

Strong Acid

Explanation:

Hope this helps! :)

The wavelength is obtained as 122 nm. Option A

We know that from the Bohr model of the atom, an electron can move from a higher energy level to a lower energy level or from a lower energy level to a higher energy level. This is the idea of energy quantization as put forward by Neill Bohr.

The wavelength can be obtained by the use of the formula;

1/λ = RH(1/n^2initial - 1/n^2 final)

λ = wavelength of the emitted light

RH = Rydberg's constant

n intial = initial energy level

nfinal = final energy level

Thus;

1/λ = 1.09 * 10^7(1/1^2 - 1/2^2)

1/λ = 1.09 * 10^7( 1 - 0.25)

λ = 122 nm

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Answer:

the half life of reaction is 2 hours which is consist half life of consist in the first order reaction has the order reaction is one

Conifers are non flowering plants that possess special cones to carry out reproduction. When conifers reproduce using these special structures, it is a form of Sexual reproduction.

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Answer:

1.33 x 10¹⁵ Hz

Explanation:

You can find the frequency using the following equation:

f = c / λ

In this equation,

-----> f = frequency (Hz)

-----> c = speed of light (3.0 x 10⁸ m/s)

-----> λ = wavelength (m)

Before we can plug the values into the equation, we need to convert the wavelength from nm to m.

 225 nm                 1 m
----------------  x  --------------------  =  2.25 x 10⁻⁷ m
                           1 x 10⁹ nm

f = c / λ

f = (3.0 x 10⁸ m/s) / (2.25 x 10⁻⁷ m)

f = 1.33 x 10¹⁵ Hz

The frequency of a wave can be calculated using the wavelength and and speed of light. The frequency of a wave with 225 nm is 1.33 × 10¹⁵ Hz.

Frequency of a wave is the number of wave cycles per second. It mathematically taken as the inverse of time taken to travel and it have a unit of s⁻¹ other than Hz.

The wavelength of an electromagnetic wave is the distance between two consecutive crests or troughs.Wavelength and frequency are in inverse relationship. For a longer wavelength the frequency will be lower.

Higher frequency waves are more energetic than longer wavelengths. Thus energy and frequency are in direct proportion

It is given that the wavelength of the electron is 225 nm. Consider the electron behaving as wave and the frequency v can be calculated using the speed of light c as follows:

[tex]v = C/\lambda[/tex]

  = (3 ×10⁸ m/s) /(225 ×⁻⁹ m)

   = 1.33 × 10¹⁵ Hz.

Hence, the frequency of an electron with a wavelength of 225 nm is 1.33 × 10¹⁵ Hz.

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The new concentration of the lemonade solution, given the data from the question is 3.47 M

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

The molarity of the new solution can be obtained by using the dilution formula as shown below:

M₁V₁ = M₂V₂

2.37 × 473 = M₂ × 323

1121.01 = M₂ × 323

Divide both side by 323

M₂ = 1121.01 / 323

M₂ = 3.47 M

Thus, the concentration of the new solution is 3.47 M

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