Indicate whether each of the following structures is (R)-2-chlorobutane or (S)-2-chlorobutane.

The volume of a 2.498M solution that contains 245 g of sulfuric acid is 1L.

The volume of a solution can be calculated from the molarity using the following expression:

Molarity = no of moles ÷ volume

Molarity refers to the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

no of moles of sulfuric acid = 245g ÷ 98g/mol

no of moles of sulfuric acid = 2.5moles

volume = 2.5moles ÷ 2.498M

volume = 1L

Therefore, 1L is the volume of the sulfuric acid solution.

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The amplitude of the wave  motion is 0.2 m. The period of the wave is 4s.

\We know that the amplitude of the wave would have to be the maximum disturbance of the wave. This is the point at which the waves would get to the highest levels of the disturbance of the wave.

We know that the graph shows the wave motion and the motion of the wave can be traced out of the graph. It is clear as we read the graph that the point of the maximum displacement would occur at 0.2 m and this is the amplitude of the wave.

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In Part A, "it" refers to "a single idea for the poetry collection."

In Part B, "it" refers to "the correct answer."

A phrase is a group of words that forms a part of a sentence and does not contain a subject and verb. Phrases are used to add structure and detail to sentences, and they can be used to perform various grammatical functions in a sentence.

There are several different types of phrases, including noun phrases, verb phrases, adjective phrases, and adverb phrases.

Therefore, below are some examples of phrases:

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a) The wavelength of the calcium is 620 nm

b) The energy of the calcium is 3.2 * 10^-19 J

c) Electronic configuration of calcium is [tex]1s^2 2s^2 2p^6 3s^2 3p^6 4s^2[/tex]

d) The shorthand configuration is [Ar] 4s².

We know that the flame test is the kind of test that we can be able to use to know the ion that has been present in the sample that we are trying to analyze. When the ample is moistened and exposed to light, we would see a color that corresponds to a given wavelength.

We know that the wavelength of the calcium light can be obtained as 620 nm and that we can see this to be the orange - red light of the calcium shown.

The energy of the light is given from;

E = hc/λ

E = energy

h = Plank's constant

c = speed of light

λ = wavelength

Then we have;

E = 6.6 * 10^-34 * 3 * 10^8/ 620 * 10^-9

E = 3.2 * 10^-19 J

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The correct Lewis structure for Group 5A element, Arsenic is structure A.

What are Lewis structure?

A very simplified representation of a molecule's valence shell electrons is known as a Lewis structure. The octet rule, which states that atoms share electrons such that each has eight in its outer shell, is the foundation of a Lewis structure. Lewis structures are used to examine and comprehend chemical bonds and atomic structures.

Arsenic is an element that, as far as we are aware, belongs to group 15 and has a total of 5 valence electrons. The structure shows the five covalent bonds that bind arsenic to one another chemically. So, once one electron is filled in isolation, pairing takes place.

Arsenic's true Lewis structure, thus, is structure A for Group 5A element.

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The pairs of solutions that produces a precipitate when combined are  [tex]Cu(NO_{3})_{2}[/tex] and [tex]K_{2} CO_{3}[/tex]3. So the correct option is B.

A precipitate is a solid that is created from a solution in an aqueous state in which two chemicals react. The precipitate then, once formed, will remain floating in solution. If you intervene in the process by putting the solution in a centrifuge, it will press the mass to the bottom of the tube, generating a compact mass.

The generation of the precipitate can be generated only if the characteristics of the compounds will overcome the solubility that it has to be able to generate a reaction.

All this will be generated because in the solution there will be components which will generate a chemical reaction between two ionic compounds. For this reason, the correct option will be B. [tex]Cu (NO_{3}) _{2}[/tex] and [tex]K_{2} CO_{3}[/tex].

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Option C, The electron transition from n = 5 to n = 1 in hydrogen atom requires the largest amount of energy as it is moving from a higher energy state to a lower energy state, thus overcoming the highest amount of electrostatic force of attraction to the nucleus.

In the hydrogen atom, the energy of an electron is related to its distance from the nucleus, which is characterized by the principal quantum number (n). As the distance of an electron from the nucleus increases, its energy decreases. Therefore, the electron transition that requires the largest amount of energy is when an electron jumps from the state with the lowest principal quantum number to the state with the highest principal quantum number.

From the options given, the transition that requires the largest amount of energy is c. From n = 5 to n = 1 because, in this case, the electron is transitioning from the state with the highest principal quantum number (n = 5) to the state with the lowest principal quantum number (n = 1). This transition requires the largest amount of energy because the electron must overcome the highest amount of electrostatic force of attraction to the nucleus.

It's important to notice that all the other options (a. from n=1 to n=2, b. from n=2 to n=3, d. from n=3 to n=5) are transitions that go to a lower n, meaning that the electron is getting closer to the nucleus and therefore lower energy state.

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Answer:

[tex]frequency \: = \frac{1}{period} [/tex]

[tex]speed \: of \: wave = frequency \times wave \: length[/tex]

By using these two laws :

The number of particles of gold that are in 2.3 moles of Au is 1.38 * 10²⁴ particles.

The number of moles of O₂ in 15.5 grams of O₂ is 0.48 moles

The mass in grams of 2.47 x 10²¹ formula units of sodium oxide is 0.254 grams

The number of atoms of titanium in 23.4 Kg Ti is 2.93 * 10²⁶ atoms

The mass in grams of O₂ needed to produce 75.0 grams of H₂O is 66.67 grams of O₂

The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ is 9.375 g.

The number of particles in a mole of a substance is 6.02 * 10²³.

Considering the given questions:

The number of particles of gold that are in 2.3 moles of Au = 2.3 *  6.02 * 10²³

The number of particles = 1.38 * 10²⁴ particles.

The number of moles of O₂ in 15.5 grams of O₂ = 15.5/32

The number of moles of O₂ = 0.48 moles

The mass in grams of 2.47 x 10²¹ formula units of sodium oxide = 2.47 x 10²¹/ 6.02 * 10²³ * 62 g

The mass in grams of 2.47 x 10²¹ formula units of sodium oxide = 0.254 grams

The number of atoms of titanium in 23.4 Kg Ti = 6.02 * 10²³ * 23.4 * 1000/48

The number of atoms of titanium in 23.4 Kg Ti = 2.93 * 10²⁶ atoms

The mass in grams of O₂ needed to produce 75.0 grams of H₂O = 75/18 * 1/2 * 32

The mass in grams of O₂ needed to produce 75.0 grams of H₂O = 66.67 grams of O₂

The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ = 75/32 * 2 * 2 g

The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ = 9.375 g.

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Answer:

180 m^2

Explanation:

The total area of the vegetable patch and the orchard can be found by adding 46.2m^2 and 133.6m^2, which equals 179.8m^2. Rounded to the nearest square meter, the total area is 180m^2.

To find the total area of the vegetable patch and the orchard, we simply need to add their respective areas together. From this, the total area of the vegetable patch and the orchard is approximately 179.8 square meters when rounded to the nearest square meter.

Area of the vegetable patch = 46.2 m²

Area of the orchard = 133.6 m²

Total area = Area of the vegetable patch + Area of the orchard

Total area = 46.2 m² + 133.6 m²

Total area = 179.8 m²

Therefore, the total area of the vegetable patch and the orchard is approximately 179.8 square meters when rounded to the nearest square meter.

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The lattice energy of molecular crystals is calculated using the enthalpy of sublimation (ΔHsub) according to hess’ law of constant heat of summation.

More energy is needed per gram for sublimation and evaporation below 100 °C than 540 calories. One gram of water needs approximately 585 calories to evaporate at 20 °C (68 °F). The latent heat of vaporization is released as water vapour returns to liquid form.

Li (g) + Cl(g) → LiCl(s)

ΔHf(LiCl) = ΔHsub(Li) + IP(Li) + ΔHdiss(Cl) + EA(Cl) + L.A

L.A (Lattice energy of LiCl) = ΔHf(LiCl) -{ΔHsub(Li) + IP(Li) + ΔHdiss(Cl) + EA(Cl)}

ΔHf = Enthalpy of formation

ΔHsub = Enthalpy of sublimation

IP = Ionization potential of Li

ΔHdiss = Enthalpy of dissolution

EA = Energy of activation.

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The emission of a transmitter is caused by the action of calcium ions, which also cause synaptic vesicle exocytosis, which releases the neurotransmitters inside the vesicles and starts synaptic transmission.

Nearly all bodily biological processes, including heart and muscle pulses, neurotransmission of information, memories and learning baby creation, cell proliferation, and Calcium ions enter the cytoplasm of organelles through calcium channels.

Calcium plays a critical role in the brain's regulation of synaptogenesis and memory formation. This process activates certain calmodulin signal transmission pathways and involves important protein effectors such CaMKs, MAPK/ERKs, or CREB.

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The roles of the substances in the equation is substances C₃H₈ and 5O₂ are reactants that react to form the products 3CO₂ and 4H₂O. The correct option is d.

A balanced chemical reaction is one in which the number of individual element atoms present on the reactant side and the number of individual element atoms present on the product side must match.

The species present on the left side of the right arrow are reactants in the balanced chemical reaction, and the species present on the right side of the right arrow are products.

Therefore, the correct option is d, the substances C₃H₈ and 5O₂ are reactants that react to form the products 3CO₂ and 4H₂O.

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The question is incomplete. Your most probably complete question is given below:

What are the roles of the substances in the equation?

The substances C3H8 and 3CO2 are reactants that react to form the products 5O2 and 4H2O.

The substances 3CO2 and 4H2O are reactants that react to form the products C3H8 and 5O2.

The substances 5O2 and 3CO2 are reactants that react to form the products C3H8 and 4H2O.

The substances C3H8 and 5O2 are reactants that react to form the products 3CO2 and 4H2O.

We know that matter is anything that has mass and occupy space. It should be at the back of our minds that the properties that matter would have is going to depend on the state that the matter is in. There are three states of matter and the states of matter that we do have are;

Solid

Liquid and

Gas

We have to note that the way that we have the agglomeration of the molecules that compose the substance in any of the states of matter would affect the observed properties of matter in that state.

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NaCl has greater lattice energy as the size of anions is similar but the size of cation in NaCl is smaller than RbCl.

Lattice energy refers to the release of energy which occurs when the constituent atoms are placed in their respective positions on the crystal lattice. Additionally, it also refers to the amount of energy required to separate an ionic crystal into its component ions. Lattice energy is a measure of the ionic bond strength in an ionic compound. It is used to gain insight into different properties of ionic solids such as solubility, volatility, and hardness. Lattice energy is directly proportional to the ionic charges product and inversely proportional to the internuclear distance or the size of ions. When considering NaCl and RbCl the radius of Rb+ is greater than Na+, hence it will have less lattice energy. The cation with smaller radii exhibits higher lattice enthalpy.

Note: The question is incomplete. The complete question probably is: Why is the lattice energy of NaCl greater than the lattice energy of RbCl?

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Option  (b) and (d) are correct. As the strength of a Bronsted-Lowry base increases, its conjugate acid becomes weaker and the higher the pKa value of its conjugate acid.

According to the Bronsted-Lowry base, base is a proton acceptor. Once an acid has given up a proton the part that remains is called the acid's conjugate base. This species is a base because it can accept a proton to re-form the acid. The part of the base that remains after a base accepts a proton is called the base's conjugate acid. The determination of a substance as a Bronsted-Lowery acid or base can only be done by observing the reaction. In this theory, an acid is a substance that can release a proton like in the Arrhenius theory and a base is a substance that can accept a proton. A Bronsted - Lowry base  accepts proton , H+  from a Bronsted - Lowry acid. As the strength of a Bronsted - Lowry base increases then the strength of its conjugate acid decreases and Ka value of conjugate acid  decreases and pKa value of conjugate acid increases.

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Answer:

Rb

Explanation:

Elements arranged in vertical column are part of family or a group. Elements in a group all act very similarly. Sodium falls in Group I which consists of both H and Rb. But you have to remember that H is non-metal whereas, Rb is metal (sodium is metal as well) thus Rb would be closest to sodium in behavior.

Answer:

To answer this question, we'll need to use two equations:

E

=

h

ν

,

and

c

=

λ

ν

,

where

E

is energy in Joules,

h

is Planck's constant of

6.626

×

10

−

34

Joule-seconds,

ν

is frequency,

c

is the speed of light, which is

2.9979

×

10

8

m

/

s

, and

λ

is wavelength in meters.

Since

ν

is in both equations, we can combine them:

c

=

λ

ν

ν

=

c

λ

E

=

h

ν

∴

E

=

h

c

λ

The question gives us a wavelength of

0.122 m

, so we can just plug that value into our equation and solve for

E

:

E

=

h

c

λ

E

=

(

6.626

×

10

−

34

J

⋅

s

)

×

(

2.9979

×

10

8

m

/

s

)

0.122 m

=

1.63

×

10

−

24

J

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the given statement is false.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Carbon reacts with four Hydrogen's to form methane through covalent bonding. Each hydrogen donates one electron to Carbon therefore having a filled outer shell with 8 electrons.

Therefore, the given statement is false.

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Answer:

very simple .For eg we take one...

3KOH + H3PO4 gives K3PO4 + 3H2O

Answer:

Magnesium carbide, MgC2, is a binary compound formed from the elements magnesium and carbon. It can be synthesized by reacting magnesium metal with gaseous acetylene (C2H2) at high temperatures. The resulting product is a gray, crystalline solid that is relatively hard and has a high melting point.

It is not possible for magnesium to form a compound with the formula Mg4C2, because this would require the magnesium atom to have an oxidation state of +4, which is not possible for magnesium. Magnesium typically has an oxidation state of +2 in its compounds, so the most likely formula for a magnesium-carbon compound would be Mg2C. However, this compound does not appear to be stable under normal conditions and is not well-known.

In the given compound,each C=C unit is not stereoisomeric as it does not contain any functional groups.

Functional group is defined as a substituent or group of atoms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.

Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.

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The correct name of the hydrocarbon is based on the arrangement of the substituents present.

Hydrocarbons are named based on the type of structure they have. Here are the most common naming conventions:

Alkanes: Named based on the number of carbons in the chain, with the suffix "-ane".

Alkenes: Named by changing the suffix of the alkane name from "-ane" to "-ene".

Alkynes: Named by changing the suffix of the alkane name from "-ane" to "-yne".

Aromatic hydrocarbons: Named as "benzene", "toluene", "phenol", etc.

Cyclic hydrocarbons: Named based on the number of carbons in the ring, with the prefix "cyclo" and the suffix "-ane", "-ene", or "-yne".

Now we have to look at the structure of the compound that have been given and we know that the name of the compound is based on the arrangement of the substituents present.

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Answer:

9.990-357

Explanation:

aru not arh is 9.990-357

Answer:

D) increasing land area on islands

Explanation:

Because one of the results of the global warming is rising sea level so it will not increase the land area on island.

The population changed between 2005 - 2010 because more people died than were born. Option C

Many times we would need to show the demographic information of a place on a graph. The graph is a way that we could be able to show some information and the depiction would have two axis. The vertical axis and the horizontal axis as we can see in the graph that has been shown.

In the graph, we can see the changes in the population of a town within a specified time that we are trying to consider and the time that we have been asked to look at for in the question is the time that is between the years 2005 and the year 2010. We can see that the population was changed due to higher death rate and a lower birth rate as shown.

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Every time a problem provides you with a compound's molar mass, you can use a little trick to help you determine the compound's molecular mass faster.

More specifically, instead of determining the empirical formula first, then using the molar mass to get the molecular formula, you can skip the empirical formula altogether.

As you know, a compound's molar mass tells you what the mass of one mole of that substance is. In this case, one mole of your compound has a mass of 142.00 g.

This means that if you pick a sample of 142.00 g of this compound, you can use its percent composition to get the exact number of moles of each element you get per mole of compound.

So, you know that this compound's percent composition is as follows

carbon→50.7 %

hydrogen→4.2%

oxygen→45.1 %

This means that it contains

142.00 g compound×

100 g compound

50.7 g C

=71.994 g C

142.00 g compound×

100 g compound

4.2 g H

=5.964 g H

142.00 g compound×

100 g compound

45.1 g O

=64.042 g O

Now, all you have to do is use the molar masses of these three elements to determine how many moles of each element you get in one mole of your compound.

For C: 71.994 g×

12.011 g

1 mole C

=5.994≈6

For H: 5.964 g×

1.00794 g

1 mole H

=5.92≈6

For O: 64.042 g×

15.994 g

1 mole O

=4.003≈4

Therefore, the molecular formula of the compound will be C

6H 6 O 4

.

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The complete chemical formula for the unknown compound is P₂O₅.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

Ratio of moles = (Moles of phosphorous Moles of oxygen) …… (1)

Substitute 8.20mol for moles of an oxygen atom and 3.3mol for moles of phosphorous atom in the equation (1).

Ratio of moles

=(3.3mol8.20mol)

=2.4848

The ratio of moles of elements remains the same in the compound and therefore the formula to calculate the value of x in P2Ox is as follows:

(MolesofphosphorousinP2Ox MolesofoxygeninP2Ox)

= Ratio of moles in the given sample …… (2)

Substitute 2.4848 for the ratio of moles in the given sample, x for the moles of oxygen in P2Ox and 2 for the moles of phosphorous in P2Ox in the equation (2).

(2x) = 2.4848x

=4.96969

=5

The value of x is 5 and therefore the complete chemical formula for the unknown compound is P2O5.

Thus, The complete chemical formula for the unknown compound is P₂O₅.

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