in attempting to explain the line spectrum of hydrogen, bohr suggested that the energy of electrons in atoms is

If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

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The liquid is the state of matter of the substance. subsequently, liquid is correct.

A “state of matter” is a manner to describe the behaviour of atoms and molecules in a substance.

In a liquid state of depend, particles are much less tightly packed as compared to solids. liquids take the shape of the box in which they may be kept. liquids are difficult to compress as debris have much less space between them to move. liquids have constant volume but no fixed shape.

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Answer:

2 Pb(NO3)2 = 2 PbO + 4 NO2 + O2

2 KNO3 = 2 KNO2 + O2

4 Al + 3 O2 = 2 Al2O3

60KI + 3H20 + 40O3 → 60KOH + 30I2 + 30O2

2 FeCl3 + SO2 + 2 H2O = 2 FeCl2 + 2 HCl + H2SO4

Check if its right

Explanation:

2Pb(NO3)2=2PbO+4NO2+ O2

4KNO3=4KNO2+2O2

8AL+6O2=4AL2O3...

I tried ....

Answer:

Option D. Decomposition reaction

Explanation:

MgBr₂ (s) —> Mg (s) + Br₂ (l)

To know which option is correct. It is important that we have an understanding of what each option means.

1. Synthesis reaction: This is a type of reaction in which two different elements react to produce a new compound different from the two elements that reacted. e.g

A + D —> AD

2. Combustion reaction: This is a reaction which involves a compound and oxygen to produce carbon dioxide (CO₂) and water (H₂O) e.g methane (CH₄) undergoes combustion reaction as follow:

CH₄+ 2O₂ —> CO₂ + 2H₂O

3. Single Replacement reaction: This is a reaction in which one element replaces or displaces another element in a single compound. This is illustrated below:

X + WZ —> XZ + W

We can see that the X replaces W in the reaction.

4. Decomposition reaction: This is a type of reaction in which a compound decompose or breaks into two or more simple compounds or elements e.g

ZX₄ —> Z + 4X

From the above illustrations, we can conclude that the the reaction:

MgBr₂ (s) —> Mg (s) + Br₂ (l)

Is a decomposition reaction because MgBr₂ breakdown into Mg and Br₂

The energy transformation that is represented by  X and Y in the flowchart is; X: electrical energy; Y: heat energy.

Let us recall that in accordance to the first law of thermodynamics, energy can neither be created nor destroyed but can be transformed from one form to another. In this case, we can see that there is a transformation of energy.

Energy can never be lost from the system. We can only have the energy changing its form but the total energy of the system must at all times remain constant because any departure from this would be a violation of the first law of thermodynamics.

Thus, we can see that there is a transformation and from the flow chart, this is going to correspond to a move from electrical energy to heat energy.

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The energy that is associated with the emission line is given as 2.97 x 10^-19 J

The fomula for the energy associated with an electromagnetic wave is given by the equation:

E = h*f

definition of the terms in the definition

we have E = energy

H is the plancks constant. This constant is 6.626 x 10^-34 J*s

F is the frequency

Since f = 4.47x10^14 s^-1.

we have to multiply the values that we have to get the Emission line

This is given as

E = (6.626 x 10^-34 J*s) * (4.47 x 10^14 s^-1)

E = 2.97 x 10^-19 J

Therefore, the energy associated with the emission line is 2.97 x 10^-19 Joules.

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The most important covalent bond in forming PC (phosphatidylcholine) from its primary constituents is the ester bond between the phosphate group and the glycerol backbone.

PC is a type of phospholipid composed of a glycerol backbone, two fatty acid chains, a phosphate group, and a choline molecule. The formation of PC involves several covalent bonds, but the most significant one is the ester bond between the phosphate group and the glycerol backbone.

The process of forming PC starts with the attachment of two fatty acid chains to the glycerol backbone through ester linkages. Then, a phosphate group, derived from phosphoric acid, is attached to the third hydroxyl group of the glycerol molecule. Finally, a choline molecule is linked to the phosphate group through a phosphoester bond.

The ester bond between the phosphate group and the glycerol backbone is crucial because it provides stability and structure to the phospholipid molecule. This bond determines the overall shape and properties of PC and is responsible for its amphiphilic nature, allowing it to form the lipid bilayers found in cell membranes.

While other covalent bonds, such as the ester bonds between the fatty acid chains and the glycerol backbone, are also important for the structure of PC, the ester bond between the phosphate group and the glycerol backbone plays a pivotal role in the formation and function of this phospholipid.

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Answer:

Carbon dioxide is a very soluble gas. It dissolves readily in water. As the oceans formed, carbon dioxide dissolved to form soluble carbonate compounds so its amount in the atmosphere decreased. Carbonate compounds were then precipitated as sedimentary rocks, eg limestone.

Uptake by living organisms

Carbon dioxide was also absorbed from the oceans into photosynthetic algae and plants. Many of these organisms, and the simple organisms in the food chains that they supported were turned into fossil fuels, eg crude oil, coal and natural gas, which all contain carbon.

Coal is a fossil fuel which was formed from trees which were in dense forests in low-lying wetland areas. Flooding caused the wood from these forests to be buried in a way that prevented oxidation taking place. Compression and heating over millions of years turned the wood into coal.

Crude oil and natural gas were formed from simple plants and tiny animals which were living in oceans and lakes. These small organisms died and their remains sank to the bottom where they were buried under sediments. The lack of oxygen prevented oxidation from occurring.

Over millions of years, heat and pressure turned the remains of the organisms into crude oil and natural gas. Natural gas contains the smallest molecules and is often found on top of crude oil, trapped under sedimentary rock.

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Answer:

Changes in the atmosphere

Explanation:

Explanation:

I think it is maintaining certain internal condition

The correct answer is the two protons on the middle carbon of propane are interchangeable by rotational symmetry and are therefore said to be homotopic.

The statement that describes the two protons on the middle carbon of propane that are interchangeable by rotational symmetry is they are said to be homotopic.

The homotopic is the term used to describe the two atoms that can be interchanged with each other by a symmetry operation that involves only rotations. Here, the term "homotopic" is used to describe the two protons in the propane molecule that can be interchanged by rotational symmetry.

Propane molecule: Propane is a straight-chained hydrocarbon composed of three carbons bonded to eight hydrogens. It is the third member of the alkane family, and its molecular formula is C₃H₈.

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Matter can be classified into four categories, namely elements, compounds, homogeneous mixtures, and heterogeneous mixtures.

1. Element: Examples include hydrogen, oxygen, and gold. These substances cannot be broken down into simpler substances through chemical means.

2. Compound: Examples include water (H2O), carbon dioxide (CO2), and table salt (NaCl). Compounds have a fixed ratio of elements and can be broken down into their constituent elements through chemical reactions.

3. Homogeneous mixture: Examples include air, saline solution, and brass. The components of these mixtures are evenly distributed and cannot be seen individually.

4. Heterogeneous mixture: Examples include sand and water, oil and water, and a bowl of cereal. The components of these mixtures are unevenly distributed and can often be seen individually. Remember that the classification of matter depends on its composition and properties.

In summary, the classification of matter as an element, compound, homogeneous mixture, or heterogeneous mixture depends on the composition and uniformity of the sample.

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Answer:

C. All of the above

Explanation:

They all happen beyond critical point.

The fraction of collisions at 298K are 7.14 x \(10^-^1^4\)

Based on the collision theory, effective changes are only produced by a certain number of impacts between suitable reactant components with the right orientation; these successful transformations are referred to as successful fractions of collisions.

According to the collision theory, for a chemical interaction to take place, the reacting molecules must come into contact with one another. The frequency of collisions affects the reaction's rate. According to the idea, responding particles frequently encounter without reacting.

Given:

Ea = 75KJ/mol

R = 8.314J/molK

T = 298K

To find:

Fraction of collisions, f = ?

Formula:

Fraction of Collisions, \(f = e^\frac{-Ea}{RT}\)

Calculations:

f = \(e ^ \frac{-75000}{8.314 * 298}\)

f = 7.14 x \(10^-^1^4\)

Result:

The fraction of collisions having sufficient energy are 7.14 x \(10^-^1^4\).

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Answer:

A.) 12

Explanation:

The number of valence electrons= the group number

Answer:

c) 3 valence elcertons

Answer:

C Plum Pudding; incorrect

Explanation:

Ernest Rutherford tested it through his famous gold foil experiment and found that it was incorrect.

90 cm below the height of the lens, or 270 cm behind it, the light intersects the primary axis.

The rays that are parallel to the concave mirror's main axis converge at a single spot. The focal point or focus of a concave mirror is this location.

The thin lens equation can be used to resolve this issue:

1/f = 1/di + 1/do

where f denotes the lens's focal length, di the distance of the image from the lens, and do the distance of the object from the lens.

Given that the lens's height is 180 cm, we may calculate its focal length to be f = 90 cm. The object distance from the lens is specified as do = 120 cm, while the image distance is given as di = 60 cm.

When we enter these values into the thin lens equation, we obtain:

1/90 = 1/60 + 1/do

Solving for do, we get: do = 180 cm

As a result, the image is created 180 cm from the lens. The object distance from the lens changes when the learner raises the flashlight by 30 cm, becoming:

do' = 120 + 30 = 150 cm

We can use the same equation to find the new image distance:

1/90 = 1/di' + 1/150

Solving for di', we get: di' = 270 cm

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Answer:

1. single replacement

Explanation:

Single replacement can be represented by AB+C ⇄B+AC, which matches the picture

Double replacement and double displacement are the same kind of reaction and can be represented by AB+CD ⇄BD+AC

Decomposition reaction can be represented by AB ⇄A+B

Answer:

E. OZONE

Explanation:

Of more importance to us, ultraviolet photons have enough energy to damage or destroy DNA, visible and infrared photons do not. When we absorb visible or infrared photons the energy carried by the photon goes into heating us up, but will not permanently damage our cells like ultraviolet photons can.

answer is E. Ozone

Answer: a for the first one , d for the second  one, b for the third one.

Explanation:

Answer:

A: Main sequence star.

B: White Dwarf.

C: Black hole.

Explanation:

Brainliest please.

The true statement is b- Lewis bases are electron pair donors. Lewis bases are referred to as species that have extra electrons and have the tendency to give electrons to Lewis acids that have empty orbitals.

What is Lewis base?

Any substance that has the ability to give a pair of nonbonding electrons, such as the OH- ion, is considered a Lewis base. Therefore, a Lewis base is an electron-pair donor.

The correct answer is option B.

Lewis bases provide extra electrons to species with empty orbitals since they have filled orbitals compared to their own. Lewis bases are therefore electron donors, providing option (B) the proper choice.

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The formulas "C,H," and "CH3" are likely to represent ligands that can form complexes with a transition metal.

Based on the given options:

Among the options provided, the formulas "C,H," and "CH3" are likely to represent ligands that can form complexes with a transition metal.

Ligands are typically molecules or ions that can donate electron pairs to the central transition metal atom to form coordination complexes.

However, the formulas "SP," "OOH," and "Ba" do not represent commonly known ligands in coordination chemistry.

Therefore, the ligands likely to form complexes with a transition metal in this case are "C,H," and "CH3."

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Answer:

Yes

Explanation:

By definition, the equilibrium constanct, Kc, for the reaction A ⇒ 2B is

= [A]^1 / [B]^2

Substitute [A] = 4 and [B] = 2 in the equation,

[A]^1 / [B]^2

= 4^1 / 2^2

= 1

= Kc

So yes the reaction is at equilibrium.

Let's find K_c

\(\\ \rm\Rrightarrow K_c=\dfrac{[B^]^2}{[A]^1}\)

\(\\ \rm\Rrightarrow 1=\dfrac{2^2}{4}\)

\(\\ \rm\Rrightarrow 1=\dfrac{4}{4}\)

\(\\ \rm\Rrightarrow 1=1\)

Yes it's at equilibrium

Answer:

11 is the atomic number of alkali metal

Explanation:

The Group 1 elements are called the alkali metals. ... All the Group 1 elements are very reactive . They must be stored under oil to keep air and water away from them. Group 1 elements form alkaline solutions when they react with water, which is why they are called alkali metals.

Answer:

8

Explanation:

This number normally equals the number of electrons that atom needs to have a total of eight electrons (an octet) in its outer shell.

Answer: It’s as hot as the sun

Explanation: Sorry if this is wrong. Have a blessed and wonderful day :)

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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