A series of five short lines. The first has an up and a down arrow, and is labeled below 1 s. The second has an up and a down arrow, and is labeled 2 s. The third has an up arrow and no label. The fourth has an up arrow and is labeled 2 p. The fifth has an up arrow and no label.

Answer:

Explanation:

There are three valence electrons in a boron atom.

In boron trifluoride, the central boron atom did not achieve an octet with eight valence electrons. Rather, that boron atom would be electron deficient with only six valence electrons.

Each of the three fluoride atoms would have shared one valence electron with that boron atom, with a total of three boron-fluorine single bonds. On the other hand, all three of the valence electrons of that boron atom would be involved in bonding. Hence, there would be no extra valence electrons to act as lone pairs on that boron atom.

Hence, the central boron atom would have three electron domains (one for each boron-fluorine bond) with none of the electron domains coming from lone pairs. By the VSEPR theory, the geometry of the molecule would be trigonal planar. All four atoms in this molecule would be in the same plane.

There are five valence electrons in a nitrogen atom.

In ammonia, the central nitrogen atom is indeed able to achieve an octet (with eight valence electrons in total.) Three of the five valence electrons of nitrogen would form a total of three hydrogen-nitrogen bonds. The other two valence electrons would form a lone pair.

Hence the central nitrogen atom would have four electron domains (one for each of the three hydrogen-nitrogen bond, and one for the lone pair.) Hence, by the VSEPR theory, the geometry of this molecule would be trigonal pyramidal.

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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Answer:

Atoms are less compact when they dissolve, it can’t be C and D

Explanation:

I’m not giving you the answers

When salt is dissolved in water, the process of dissolving makes the electrons in their atoms free to move.

We know that water is a covalent molecule hence its dissociation does not yield a significant conductivity. Also, solid ionic substances are poor conductors of electricity.

When salt is dissolved in water, the process of dissolving makes the electrons in their atoms free to move.

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A primary election is the type of election in which candidates from the same party compete against one another to try to win the party's nomination.

A formal procedure of communal decision-making, an election that's how a population chooses a person or people to hold public office.

A general election would be one that takes place simultaneously throughout all constituencies, usually the day before or within a few days. When a member dies or resigns, elections may be conducted just for that constituency to replace the vacancy.

For positions with fixed terms, such as that of the president, governor, or legislator, primaries are frequently held. There are normally no special primaries for positions that could be replaced without holding a new election, including such a prime minister.

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0.13 gram of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate.

The term molarity is defined as the number solute dissolve in per litre of solution.

The balanced chemical equation that describes this double replacement reaction is as follows:

2NaOH + ZnSO₄ ⇒ Zn(OH)₂  + Na₂(SO)₄

Notice that you need 2 moles of sodium hydroxide in order to react with

1 mole of zinc(II) sulfate and produce 1 mole of zinc(II) hydroxide.

Use the molarities and volumes of the two solutions to figure out how many moles of each reactant you are mixing together.

0.00275 moles of NaOH

0.00379 moles of zinc sulphate

0.00379 moles of zinc sulphate × 2 mole NaOH / 1 mole zinc sulphate

= 0.00759

0.00137 moles of zinc oxide × 99.42 / 1 mole zinc hydroxide

= 0.13 gram

Thus, 0.13 gram of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate.

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The person consumes approximately 144 barrels of oil equivalent energy per year.

To calculate the equivalent energy consumed by the person in barrels of oil per year, we need to divide the total energy consumed by the person in a year by the energy produced by one barrel of oil.

Energy consumed per year = 5.33 × 10⁵ kcal/day × 365 days = 1.94945 × 10⁸ kcal/year

Energy produced by one barrel of oil = 3.70 × 10⁶ kcal/barrel

Therefore, the equivalent energy consumed by the person in barrels of oil per year is:

1.94945 × 10⁸ kcal/year ÷ 3.70 × 10⁶ kcal/barrel = 52.6 barrels of oil/year

Rounding this to the nearest whole number, we get that the person consumes approximately 144 barrels of oil equivalent energy per year.

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Answer:It has 8grams of hydrgen

Explanation:

The anion radius is 0.072 nm.  the cation has a charge of +2, the anion must have a charge of -2

The force of attraction between a divalent cation and an anion is proportional to the product of their charges and inversely proportional to the distance between them. The force can be expressed as F = k * q1 * q2 / r, where k is the Coulomb constant (8.99 x\(10^-9\) N \(m^2/C^2\)), q1 and q2 are the charges of the cation and anion, respectively, and r is the distance between the centers of the ions.

Since the cation has a charge of +2, the anion must have a charge of -2. Rearranging the equation and plugging in the known values, we can solve for the anion radius: r = sqrt(k * q1 * q2 / F) = sqrt(8.99 x \(10^9\) N \(m^2/C^2\) * 2 * 2 / (1.92 x \(10^-8\) N)) = 0.072 nm.

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Answer:

B

Explanation:

the formula is d=m/v

both sides xV

dv=m

The equation describes the mass of an object in relation to its volume and density is m=D×V. option B is correct.

The density of a substance is the mass of per unit volume of a substance or any object and the density will be equal to the division of mass of the substance to the volume of the substance and its SI unit will be cubic centimeter.

The equation of mass can be calculated by the help of the formula of density too. so, the mass will be the multiplication of the density of a substance and the volume of the substance and the unit will be kilogram.

Therefore, equation describes the mass of an object in relation to its volume and density is m=D×V. option B is correct.

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The adjacent nucleotides are bound to each other through a phosphodiester bond in a nucleic acid.

Nucleic acid is a biopolymer made up of nucleotide monomers that make up nucleic acid chains. The nucleotide's three components are a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleic acids are present in all living cells, including viruses and bacteria, and they play a critical role in storing, transmitting, and expressing genetic information. RNA and DNA are two types of nucleic acids.

The phosphate group in one nucleotide forms a phosphodiester bond with the hydroxyl group on the sugar molecule of the next nucleotide in line in nucleic acids. This reaction is carried out by removing a molecule of water, resulting in a strong covalent bond between two nucleotides. These bonds make up the sugar-phosphate backbone of a nucleic acid chain, which is fundamental to its structure.

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The half-life of this radioisotope : 12 hr

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

General formulas used in decay:  

\(\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}\)

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

t=48 hr

\(\tt \dfrac{Nt}{No}=\dfrac{1}{16}\)

The half-life :

\(\tt \dfrac{1}{16}=\dfrac{1}{2}^{(48/t\frac{1}{2} )}\\\\(\dfrac{1}{2})^4=(\dfrac{1}{2})^{48/t\frac{1}{2}}\\\\4=48/t\frac{1}{2}\\\\t\frac{1}{2}=12~hr\)

Answer:

sunshine

Explanation:

because it's light u get it from the ecosystem

Answer:

sunshine is your correct answer

Abiotic factors are non-living things that "live" in an ecosystem that affect both the ecosystem and its surroundings. Some examples of Abiotic factors are the sun, rocks, water, and sand. Biotic factors are living organisms that affect other living organisms.

mark me brainest

Answer:

A

Explanation:

Solids are the most organized state of matter. States of matter change when energy is added or removed. Gas is the state of matter has the most movement of its particles.

The states of matter are the different forms of the matter in which it can exist. They are solids, liquids and gases. Solids are the states of matter in which molecules are very near to each other. They have fixed shape and volume. Liquids is the states of matter in which molecules are a little far from each other. They have different shape and fixed volume. Gas is the states of matter in which molecules are a very far from each other. They have different shape and different volume.

There are two more states of matter which are called as Plasma, Bose Einstein Condensate.

Plasma have highest energy and Bose Einstein Condensate have lowest energy.

Therefore, Solids are the most organized state of matter. States of matter change when energy is added or removed. Gas is the state of matter has the most movement of its particles.

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Answer:

5) A change in the state of matter is caused if enough what is added to or removed from a object.

A) thermal energy

C) potential energy

D) force

Viscosity and temperature have a significant impact on the rate at which a liquid flows out of a syringe. Viscosity is a measure of a liquid's resistance to flow and is determined by the intermolecular forces between its molecules. The higher the viscosity of a liquid, the slower it will flow out of a syringe.

Temperature also affects the viscosity of a liquid. As the temperature of a liquid increases, its viscosity decreases, and it becomes easier to flow out of a syringe. This is because higher temperatures cause the molecules to move more quickly, which reduces the intermolecular forces and lowers the viscosity.
In conclusion, viscosity and temperature play crucial roles in the rate at which a liquid flows out of a syringe. Higher viscosity results in slower flow, while higher temperatures result in faster flow. Therefore, it is essential to consider these factors when selecting the appropriate syringe and liquid for a particular application.

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Answer:

c... just did it on a.pex

Answer:

O C. T=1/f

Explanation:

The period of a wave is the time taken for the wave to complete a cycle while the frequency of a wave is the number of cycles completed per unit time.

The period (T) is the inverse of frequency (f) and vice versa.

Hence mathematically, i can write;

T=1/f

Answer:

For a cat name does matter as it keeps a charm when ever we call the name out. So it needs to be cherished as by a name so if it was me i would name it as Chinky.

An obvious physical difference between saturated and unsaturated fats is saturated fats are usually solids while unsaturated fats are usually liquids. (C)

Structurally, saturated fat is a type of fat in which the fatty acid chains have all or mainly single bonds. While unsaturated fats have loose bonds so that these fats are liquid at room temperature.

Saturated fats are fatty acids that have only one single bond in their molecule. Saturated fats are solid at room temperature because their chemical chains are dense and without gaps.

Unsaturated fats are fatty acids that have one single bond and one double bond in their molecule. The double bonds in unsaturated fats create gaps so that unsaturated fats are liquid at room temperature.

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132 gm of CO₂ is generated by combustion of 342 gm of C₈H₁₈.

The molar mass of a chemical compound is defined as the ratio between the mass and the amount of that substance in any sample. A material's molar mass is a bulk characteristic rather than a molecular one.

The molar mass of a substance is its mass expressed in grams per mole. G/mol, or grams per mole, is the sign for molar mass. The ratio between the mass of an isotope and the mass of the isotope carbon is known as the isotopic atomic mass, or mass of a single isotope of any particular element. -12

The reaction is :

C₈H₁₈ + 12.5O₂ ----> 8CO₂ + 9H₂O

Molar mass of C₈H₁₈ is = 12*8 + 18*1 = 114 gm

Molar mass of CO₂ is = 12+ 16*2 = 44gm

44gm of CO₂ is generated by 114 gm of C₈H₁₈

1 gm of CO₂ is generated by 114/44 gm of C₈H₁₈

132 gm of CO₂ is generated by combustion of 114*132/44 = 342 gm of C₈H₁₈

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4.2 moles of H2O are produced during the complete combustion of 1. 4 moles of C2H6.

Combustion, often known as burning, is a high-temperature exothermic redox chemical reaction that occurs between a fuel and an oxidant, typically atmospheric oxygen, to generate oxidised, generally gaseous products in a mixture known as smoke. Combustion is a chemical reaction in which a material combines quickly with oxygen and produces heat. The initial material is referred to as the fuel, while the supply of oxygen is referred to as the oxidizer.

Complete combustion happens in an infinite supply of air, particularly oxygen. Complete combustion is often referred to as clean combustion. The hydrocarbon will entirely burn out with the oxygen, leaving just water and carbon dioxide as byproducts. When a candle burns, this is an illustration of this.

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Answer:

c

Explanation:

thw observation of water that is added

The reaction of azetidine (C₃H₆NH), a weak base, with water involves the formation of the conjugate acid C₃H₆NH²⁺. The remaining species on the left side of the equilibrium constant equation can include unreacted azetidine and water molecules.

The reaction of azetidine (C₃H₆NH) with water can be represented as follows:

C₃H₆NH + H₂O ⇌ ?

To fill in the left side of the equilibrium constant equation, we need to determine the products formed during the reaction. When azetidine, a weak base, reacts with water, it can act as an acid by donating a proton (H+). Therefore, one possible product of the reaction is the conjugate acid of azetidine, which can be represented as C₃H₆NH²⁺.

Thus, we can write the left side of the equilibrium constant equation as:

C₃H₆NH + H₂O ⇌ C₃H₆NH²⁺ + ?

The "?" represents the remaining species on the left side of the equation, which could include any unreacted azetidine or water molecules.

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Answer:

Option C. 6 protons, 8 neutrons and 6 electrons.

Explanation:

14C has the following:

Mass number = 14

Atomic number = 6

Next we shall determine the number of protons in 14C. This can be obtained as follow:

Atomic number is simply the number protons in an atom. Thus,

Proton = Atomic number

Atomic number = 6

Proton = Atomic number = 6

Proton = 6

Next, we shall determine the number of neutrons in 14C. This can be obtained as follow:

Mass number = proton + neutron

Mass number = 14

Proton = 6

Neutron =.?

Mass number = proton + neutron

14 = 6 + neutron

Collect like terms

Neutron = 14 - 6

Neutron = 8

Finally, we shall determine the number of electrons in 14C.

This can be obtained as follow:

Since the isotope i.e 14C has no charge, it means that the atom is in it's ground state. Hence, the number of protons and the number of electrons are the same i.e

Electron = proton

Proton = 6

Electron = proton = 6

Electron = 6

From the above calculations, 14C has

6 protons, 8 neutrons and 6 electrons.

Answer:

B. The League of Nations condemned the violations but took no other action.

Explanation:

Nazi leader, Adolf Hitler violated the Treaty of Versailles by sending German military forces in Rhineland. He not only violated the Treaty of Versailles but the Locarno Pact also.

The treaty was signed in 1919 to end the war between Germany and the Allied Powers.

Even after Adolf Hitler violated the treaty, the League Nations did not take any actions.

Therefore, option B is correct.