The reason for the decrease in the atomic size of elements across a period is that

A. nuclear charge increases while the outermost electrons are drawn closer to the nucleus
B. nuclear charge decreases while the outermost electrons are drawn closer to the nucleus
C. valence electrons increase across the period while the valence shell remains constant
D. nuclear charge decreases while the distance of the valence shell from the nucleus is increasing​

If the natural abundance of chlorine-35 is 75.8% and that of chlorine-37 is 24.2%, then the average atomic mass of chlorine will be 35.44 amu.

Chlorine exists in two isomeric forms which are the chlorine-35 and chlorine-37. The atomic mass of the chlorine elements is basically the average atomic mass of its isotopes depending upon their abundance in nature.

The atomic mass of chlorine-35 is 34.97amu and a natural abundance equal to 75.8 %. The atomic mass of chlorine-37 is equal to 36.97 amu with an abundance of 24.2%.

To calculate the average atomic mass of chlorine,

The abundance of chlorine-35 = 75.8% = 0.758

The abundance of chlorine-37 = 24.2% = 0.242

⇒ Average atomic mass = 34.97 × 0.758 + 36.97 × 0.242

⇒ Average atomic mass = 26.50 + 8.94

⇒ Average atomic mass = 35.44 amu  

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Answer: It´s question of resonance

Explanation: I think in case of crystal glass it have

certain structure. There are certain frequencies crystal can vibrate.

High sound frequencies resonate, also give energy to structure vibrations and it vibrates more strongly until structure breaks up.

Answer:

6 moles

Explanation:

You have a 1:3 ratio between nitrogen gas and hydrogen gas

Answer:

it is the 3 answer

Explanation:

you should add 17.241 grams of calcium bromide to make a 0.203 M solution using 425 grams of water.

The first step to solving this problem is to use the formula:

molarity = moles of solute / liters of solution

We are given the molarity (0.203 M) and the volume of water (425 g), but we need to find the moles of solute to determine how many grams of calcium bromide to add. To do this, we can rearrange the formula above to solve for moles:

moles of solute = molarity x liters of solution

Since we want to make a solution using all of the water, we can assume that the volume of the solution will be 425 mL (which is equal to 0.425 L). Now we can plug in the given values:

moles of solute = 0.203 M x 0.425 L

moles of solute = 0.086275 mol

Finally, we can use the molar mass of calcium bromide to convert moles to grams:

mass of calcium bromide = moles of solute x molar mass

mass of calcium bromide = 0.086275 mol x 199.89 g/mol

mass of calcium bromide = 17.241 g

Therefore, you should add 17.241 grams of calcium bromide to make a 0.203 M solution using 425 grams of water.

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Answer:

It’s false

Explanation:

it could be true if the question mentioned alkaline solution

Answer:

True

Explanation:

Phenolphthalein is colorless in the presence of an acid and turns pink in the presence of a base.

The value of b in the equation \(\( f(t) = 85 \cdot b^t \)\) represents the decay factor of the radioactive substance. To determine the value of \( b \), we can use the information that the half-life of the substance is 21 years.

The half-life of a radioactive substance is the time it takes for half of the substance to decay. In this case, the half-life is 21 years, which means that after 21 years, the amount of the substance remaining will be half of the initial amount.

We can use this information to set up an equation:

\(\(\frac{1}{2} = b^{21}\)\)

To solve for b, we need to take the 21st root of both sides of the equation:

\(\(b = \left(\frac{1}{2}\right)^{\frac{1}{21}}\)\)

Using a calculator, we can evaluate this expression:

\(\(b \approx 0.965\)\)

Therefore, the value of b in the equation \(\( f(t) = 85 \cdot b^t \)\) is approximately 0.965.

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Hybridization is the concept of when two atomic orbitals mix up to give rise to a new type of hybridized orbitals. This intermixing of orbitals oftenly results in the formation of hybrid orbitals having entirely different energies, shapes, etc.

According to the question , Here the hybridization of the given atoms are:

1] For HCN, there are TWO electron groups surrounding the central carbon atom: a single C-H bond and a triple C-N bond. The carbon atom in HCN is therefore sp hydribidised.

2] In HCN there is a triple bond between carbon and nitrogen. A triple bond consists of the end-to-end overlap of two sigma bonds and the side-to-side overlap of two unhybridized p-orbitals. Therefore, in this case nitrogen has sp hybridization.

3] For NH₄⁺ : Since the geometry is tetrahedral, the hybridization is sp3.

4] For CH₃⁻ is sp3,

5] CH₃⁺ is sp2.

6] NH₃ hybridization is sp3

7] C[CH₃]₄ the hybridization is sp3.

8] H₃O⁺ ion, here O is sp3 hybridized

The given question is incomplete and the completed question is given as,

What is the hybridization of all the atoms (other than hydrogen) in each of the following species? HCN, NH₄⁺, CH₃⁻, CH₃⁺, NH₃, C[CH₃]₄, H₃O⁺.

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Using the equation H=cpmT and the water specific heat, the amount of heat received is determined. 4. At 100oC, water vaporizes into vapour.

The fact that it requires a lot of energy to boil water is one of its most important characteristics. To be precise, one calorie of heat must be absorbed by 4,184 Joules of water for one degree Celsius of temperature rise. To provide some context, 1 kilogram of copper can be heated to 1°C with just 385 Joules of heat.

Water takes energy during the freezing, evaporation, and sublimation processes. The water molecules alter their bonding structure and transition to a higher energy state as a result of the energy received. This energy must be provided by the atmosphere in the Earth system.

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During beat decay

D. A neutron decays into a proton and an electron occurs during beta decay.

Beta decay is a type of radioactive decay that occurs when an unstable atomic nucleus emits an electron (called a beta particle) and a type of neutrino called an antineutrino.

During beta decay, a neutron within the nucleus of an atom decays into a proton, an electron, and an antineutrino. The proton stays in the nucleus, increasing the atomic number by one, while the electron and antineutrino are emitted from the nucleus. The emitted electron is often referred to as a beta particle, hence the name beta decay

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Answer:

Explanation:

a) v=w*lambda

wavelength=5/2.5

wavelength=2m

b)342/320=1.06875m

c)342/1.5=228 Hz

d)4.6153=v/wave

Answer:

1.33%

Explanation:

In an aqueous solution, a weak acid such as acetic acid, will be in equilibrium with its conjugate base, acetate ion, thus:

CH₃CO₂H(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CH₃CO₂⁻(aq )

Where dissociation constant, ka, is defined as the ratio of concentrations of products and reactants:

Ka = 1.8x10⁻⁵ = [H₃O⁺] [CH₃CO₂⁻] / [CH₃CO₂H]

H₂O is not taken into account in the equilibrium because is a pure liquid

When a solution of acetic acid becomes to equilibrium, the original concentration of the acid decreases producing more H₃O⁺ and CH₃CO₂⁻.

The concentrations at equilibrium when a 0.100M solution of acetic acid reaches this state, is:

[CH₃CO₂H] = 0.100M - X

[H₃O⁺] = X

[CH₃CO₂⁻] = X

Where X is reaction coordinate.

Replacing in Ka expression:

1.8x10⁻⁵ = [H₃O⁺] [CH₃CO₂⁻] / [CH₃CO₂H]

1.8x10⁻⁵ = [X] [X] / [0.100M - X]

1.8x10⁻⁶ - 1.8x10⁻⁵X = X²

1.8x10⁻⁶ - 1.8x10⁻⁵X - X² = 0

Solving for X:

X = -0.00135 → False solution. There is no negative concentrations.

X = 0.00133 → Right solution.

That means concentration of acetate ion is:

[CH₃CO₂⁻] = 0.00133M.

Now, percent ionization is defined as 100 times the ratio between weak acid that is ionizated, [CH₃CO₂⁻] = 0.00133M, per initial concentration of the acid, [CH₃CO₂H] = 0.100M. Replacing:

% Ionization = 0.00133M / 0.100M × 100 =

We can form more HI by increasing the temperature.

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, typically in the form of heat. This means that the energy of the reactants is lower than the energy of the products, and the reaction requires an input of energy to proceed.

In an endothermic reaction, the temperature of the surroundings usually decreases because energy is being taken in from the environment. For example, when ice melts, the process is endothermic because the ice absorbs heat from its surroundings, causing the temperature to drop.

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Answer:Remove HI gas

Explanation:Acellus confirmed

The frequency of the color light, given that it has a wavelength of 5.0×10⁻⁷ m is 6.0×10¹⁴ Hertz (last option)

First, we shall list out the given parameters from the question. This is shown below:

Speed, wavelength and frequency of wave are related by the following formula:

Velocity (v) = wavelength (λ) × frequency (f)

Inputting the given parameters, we can obtain the frequency as shown below:

3×10⁸ = 5.0×10⁻⁷ × frequency

Divide both sides by 5.0×10⁻⁷

Frequency = 3×10⁸ / 5.0×10⁻⁷

= 6.0×10¹⁴ Hertz

Thus, we can conclude that the frequency of the color light is 6.0×10¹⁴ Hertz (last option)

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Answer:

1.2 M

Explanation:

If you use the dilution equation (M1V1=M2V2), you end up with (50)(12)=(500)(M2), and when you solve for M2 you get 1.2 M.

Explanation:

distance = speed x time

distance = 10 x 2

distance = 20miles

hope that helps :)

If a cross country runner travels at a speed of 10 mph and he runs for 2 hours, 20miles he will have run at the end of the 2 hours.

Distance is a description of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can be used to describe a length in physics or to an estimate based on other factors in common usage.

The phrase is widely used metaphorically to refer to a measurement of the degree of distinction between two similar items since spatial intelligence is a rich source of implicatures in human understanding.

distance = speed x time

distance = 10 x 2

distance = 20miles

Therefore,  20miles is the distance.

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Answers:

1. People generally experience rapid growth for a second time between the ages of 15 and 20

2. The endocrine system contains the pituitary, adrenal, and thyroid glands.

3. The nuclear membrane disappears in the third stage of cell division?.

Explanation 1:

Between the ages of 15 and 20, puberty causes the release of multiple hormones, which causes rapid growth among other things.

Explanation 2:

The reproductive system contains the ovaries (female) and testes (male).

The endocrine system contains the pituitary, adrenal, and thyroid glands.

The circulatory system contains three independent systems that work together, the heart (cardiovascular), the lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic).

The respiratory/pulmonary system contains the nose, mouth, throat (pharynx), voice box (larynx), windpipe (trachea) , airways (bronchi) , and lungs.

Explanation 3:

Mitosis is the process in cell division where the nucleus divides into two nuclei, each with an identical set of chromosomes.

Interphase: occurs when the cell begins to replicate the nuclear DNA material

Stage 1 - Prophase: chromosomes begin to undergo a condensation process that will continue until metaphase. The spindle also begins to form as the two pairs of centrioles move to opposite poles.

Stage 2 - Prometaphase:  Chromosomes are pulled in opposite directions by microtubules growing out from both poles of the spindle until balanced.

Stage 3 - Metaphase:  The centromeres of all the cell's chromosomes line up at the equator of the spindle.

Stage 4 - Anaphase: The chromosomes move away from one another to opposite poles of the spindle.

Stage 5 - Telophase and Cytokinesis: The chromosomes reach the poles, the nuclear membrane then reforms, and the chromosomes begin to decondense. This is followed by cytokinesis, or the division of the cytoplasm into two daughter cells.

Most of my sources say that the nuclear membrane occurs during prophase, but the stages are listed in this order. Regardless, your answer would be A. The nuclear membrane disappears.

I hope this helps!

Answer:

SEE ATTACHMENT- GRADED AT 100%

Explanation:

Answer:

it produce atp

Explanation:

.............

Cellular respiration is a metabolic process that occurs in the cells of an organism. Carbon dioxide from cellular respiration aids the process of photosynthesis.

Cellular respiration is a process that takes place in the organism's cell where the cellular oxygen or chemical energy gets utilized and converted to ATP and waste like carbon dioxide.

The carbon dioxide released by the organism in the atmosphere is used by plants in the process of photosynthesis. Photosynthesis is a process that utilizes carbon and water to form glucose and oxygen.

Therefore, cellular respiration supports the process of photosynthesis by option D. producing carbon dioxide.

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Answer: d

Explanation:

The equation that relates ΔG, Keq, and ln is ΔG = -RT ln(Keq), where ΔG is the change in Gibbs free energy, Keq is the equilibrium constant, R is the gas constant, and T is the temperature.

The relationship between Gibbs free energy, equilibrium constant, and natural logarithm can be described by the equation ΔG = -RT ln(Keq), which is also known as the Gibbs-Helmholtz equation. This equation is used to calculate the change in Gibbs free energy during a chemical reaction, based on the equilibrium constant and temperature.

The negative sign in front of RT ln(Keq) indicates that a negative change in Gibbs free energy (ΔG) corresponds to a favorable reaction, while a positive ΔG indicates an unfavorable reaction. The equation can also be rearranged to solve for Keq or temperature, depending on the variables given in the problem.

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Answer:

A

Explanation:

Answer:

A. antibodies

Explanation:

Answer:

According to the Dalton's theory, the description of water molecule is that;

-Water molecules are made of two different kinds of atoms (hydrogen and oxygen atoms).

-All water molecules have twice as many hydrogen atoms as oxygen atoms.

-All water molecules have one oxygen atom for every two hydrogen atoms.

Explanation:

got a 100% on edge

Answer:

its nuber 3

wdPDAPS

Explanation:

Rutherford conducted a famous experiment called the gold foil experiment.

He took a skinny sheet of gold foil. He used a special gadget to shoot alpha particles undoubtedly charged debris on the gold foil. most debris passed straight thru the foil like the foil was now not there. They bombarded very skinny sheets of gold foil with fast-shifting alpha debris. Rutherford found that a small percent of alpha debris had been deflected at massive angles, which could be explained by using an atom with a very small, dense, definitely-charged nucleus at its middle.

Rutherford designed an experiment to apply the alpha particles emitted via a radioactive element as probes to the unseen global atomic structure. If Thomson changed into correct, the beam might move immediately through the gold foil. most of the beams went via the foil, however, some have been deflected. Ernest Rutherford postulated the nuclear structure of the atom, determined alpha and beta rays, and proposed legal guidelines for radioactive decay. In 1911, Rutherford, Marsden, and Geiger determined the dense atomic nucleus by bombarding a thin gold sheet with the alpha particles emitted through radium.

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as+at+room+temperature+and+pressure

Calculate the volume of 150kg of chlorine gas at room ... Calculate the volume of 150kg of chlorine gas at room temperature and pressure. The volume of one mole of gas at room temperature and pressure is 24.0dm^3. Relative formula mass

Answer:

\({ \tt{at \: \: s.t.p : }} \\ { \bf{0.0355 \: kg \: of \: chlorine \: occupies \: 22.4 \: {dm}^{3} }} \\ { \bf{150 \: kg \: will \: occupy \: ( \frac{150 \times 22.4}{0.0355} )}} \: dm {}^{3} \\ \\ { \tt{ volume = 94647.88 \: {dm}^{3} }}\)

Answer:

the periodic table

Explanation:

Elements with similar properties are in columns called groups. Elements to the left of this line are metals. Elements in the same group of the periodic table have the same number of electrons in their outer shell. This gives them similar chemical properties.

Hope this helps!

Answer:

The net force on a vehicle that is accelerating at a rate of 1.5

The net force on a vehicle that is accelerating at a rate of 1.5 m/s2 is 1,800 newtons.

Explanation:

The original temperature, given that final temperature is 215 k when the volume decreases to 0.59 L is 637.7 K

The following data were obtained from from the question:

The original temperature can be obtained as illustrated below:

V₁ / T₁ = V₂ / T₂

Inputting the given parameters, we have

1.75 / T₁ = 0.59 / 215

Cross multiply

T₁ × 0.59 = 1.75 × 215

T₁ × 0.59 = 376.25

Divide both side by 0.59

T₁ = 376.25 / 0.59

T₁ = 637.7 K

Thus, we can conclude that the original temperature is 637.7 K

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The following is a plausible scenario for the work of CoQ in the electron transport chain: CoQ is reduced by Complex I & later oxidizes Complex III (Option B).

CoQ, which stands for coenzyme Q, plays a vital role in the electron transport chain (ETC). The CoQ receives electrons from Complex I in the form of NADH and becomes reduced. Reduced CoQ then moves to Complex III, where it donates these electrons, resulting in the formation of ubiquinol and the transfer of protons across the inner mitochondrial membrane. After this transfer, CoQ oxidizes Complex III and receives electrons to form a semi-reduced CoQ, which subsequently moves to Complex IV.

Your question is incomplete, but most probably your options were

A: CoQ is reduced by Complex I & later oxidizes Complex III

B: CoQ oxidizes Complex I & then is later oxidized by Complex III

C: CoQ reduces Complex I and later reduces Complex III

D: CoQ is oxidized by Complex I and is later oxidized by Complex III

Thus, the correct option is B.

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