How does the atomic radius change as you move left to right in Period 3 from aluminum through chlorine? Refer to the periodic table.

A. it generally increases.

B. it does not change.

C. it generally decreases.

D. it varies unpredictably.

According to the given condition, the

absorbance

is the signal at the highest energy, or longest wavelength. The

fluorescence

is the signal at the lowest energy, or shortest wavelength.

Absorbance is the

logarithm

of the ratio of incident to transmitted radiant power through a sample. It is also known as the measure of the capacity of a substance to absorb light in a specific wavelength.

    Fluorescence is the

emission

of light by a substance that has absorbed light or other electromagnetic radiation. Fluorophores are molecules that absorb light in a specific wavelength and emit light in another wavelength.

    Absorbance is measured by the principle of

Beer-Lambert's

law. It is also known as Beer's law. It states that the attenuation of light to the properties of the material through which the light is travelling. It is commonly used in chemical analysis and measurements of physical optics for photons and neutrons.

     In comparison with absorbance and fluorescence, it is important to consider the specificity of each method. In absorbance, a light of certain wavelength is passed through the solution to measure the optical density or concentration.

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The following statements are correct 2 only.

A diamagnetic material is strongly attracted to a magnetic field. A material that retains its magnetism after being removed from a magnetic field is said to be ferromagnetic. Most transition metals and all lanthanide metals are ferromagnetic. Paramagnetic compounds are attracted to magnetic fields, whereas diamagnetic compounds are repelled by magnetic fields.

Paramagnetic compounds have unpaired electrons whereas in diamagnetic compounds all electrons have paired spins. They stick to ferromagnetic materials such as iron and ferrous objects such as steel. This includes everything from the steel body of your car to your refrigerator door. It is also attracted to nickel, cobalt, and other rare earth elements.

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Answer:

The chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide

The chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide.

Ocean acidification is the global decrease in seawater pH caused by the oceans' extensive uptake of atmospheric carbon dioxide (CO2) in the atmosphere. Ocean acidification is primarily caused by the Earth's atmosphere being overburdened with massive amounts of CO2, which is created by automobiles, industrial processes, and agricultural activities.

A third to a half of the CO2 produced into the atmosphere by human activity since the start of the Industrial Revolution, or around 1750, is being absorbed by the oceans. Scientists believe that at that time, seawater's average pH decreased between 8.19 to 8.05, representing a 30% increase in acidity. The chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide.

Therefore, the chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide.

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Answer: nowhere from trees

Explanation:

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.  Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

Quarks are present in protons and neutrons but not in electrons. Quarks are sub-atomic particles that have mass, but not an integer of charge.

Therefore, the correct option is option A.

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The percent difference between the pressure calculated using the van der waals' equation and the ideal pressure is 5.89 %.

This can be calculated using van der waals' equation, followed by calculating pressure difference by: [P(ideal)-P(Van der waal's equation)/P(ideal)]*100

P(ideal) is given: 16.45

P(van der waals'): [tex](P+n2aV2)(V−nb)=nRT[/tex]

T= 270.9K  

V=1.301 L

a for oxygen = 1.36 (L2 atm mol-2)

b for oxygen =  0.0319 (L mol-1)

n= 0.9686 mol

Using equation P(van der waals's) = 15.48 bar

and difference is 5.81%

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The amount of carbon dioxide (CO2) released when burning fossil fuels is the primary factor in why fossil fuels are so destructive. The greenhouse effect and climate change are significantly impacted by the burning and release of CO2. Our planet warms because more CO2 in the atmosphere prevents sunlight from escaping back into space.

what are fossils?

A fossil is any preserved remnants, impression, or trace of any once-living organism from a previous geological epoch (from Classical Latin: fossilis, meaning "obtained by digging"). Bones, shells, exoskeletons, animal or microbe impressions in stone, items preserved in amber, hair, petrified wood, oil, coal, and DNA traces are a few examples.

The earth's natural mechanisms have controlled greenhouse gas output for millions of years. At a pretty constant rate, gases would be absorbed and released. Meanwhile, temperatures were kept at a level that allowed for the continuation of life on Earth. This is "a balancing act," according to the Environmental Protection Agency.As the Industrial Revolution got under way in the second part of the 1700s, humans began to alter the delicate balance. Since then, we have been continuously increasing the amount of greenhouse gases, particularly CO2, that are being injected into the atmosphere. These gases trap heat and cause global warming. Despite the fact that there are many greenhouse gases, some of which are more powerful than others, CO2 currently accounts for about 84 percent of all greenhouse gases produced by human activity, or about 30 billion tonnes annually.Although forestry and industrial operations also make significant contributions, the majority of this is caused by burning fossil fuels for transportation and power.

CO2 levels were at 270 parts per million before the Industrial Revolution (ppm). In 1960, CO2 concentrations were at 313 ppm.

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A 40.0 ml sample of 0.25 m KOH is added to 60.0 ml of 0.15 m Ba(OH)₂.  the molar concentration of OH⁻ ion in the resulting solution is 0.28 M.

Given that :

volume of KOH = 40 mL = 0.04 L

Molarity of KOH = 0.25 M

volume of  Ba(OH)₂ = 60 mL = 0.06 L

molarity of  Ba(OH)₂ = 0.15 M

moles of OH⁻ in KOH = 0.04 × 0.25 = 0.01

moles of OH⁻ in Ba(OH)₂ = 2 (0.06 × 0.15) = 0.018

total no. of moles = 0.01 + 0.018 = 0.028 mol

total volume = 0.04 + 0.06 = 0.1 L

molarity of OH⁻ ion = moles / volume

                                 = 0.028 / 0.1

                                 = 0.28 M

Thus, A 40.0 ml sample of 0.25 m KOH is added to 60.0 ml of 0.15 m Ba(OH)₂.  the molar concentration of OH⁻ ion in the resulting solution is 0.28 M.

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The homozygous dominant genotype is 0%, the heterozygous genotype is 50%, and the homozygous recessive genotype is 50%.

This problem does not display the Punnett box. If the genotype of the heterozygous parent has spots (Ff) and the other parent is homozygous without spots, the cross between the two parents is:

Parental: Ff >< ff

Gametes: F . f >< f

Filial: Ff (heterozygous having freckles) and ff (recessive homozygous over not having freckles)

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Answer: 0%, 50%, 50%

Explanation:

Answer:

1. 0.48 M  2. 0.00814 M  3. 0.1276 M

Explanation:

1. Convert the 40 g to moles using the molar mass of C6H12O6:

40 g C6H12O6/180.16 g C6H12O6 = 0.222 mol

Then divide the number of moles by liters to find molarity:

0.222 mol/1.5 L = 1.48 M

2.  Convert the 1.55 g to moles using the molar mass of KBr:

1.55 g KBr/119 g KBr = 0.013025 mol

Then divide the number of moles by liters to find molarity:

0.013025 mol/1.60 L = 0.00814 M

3. Convert the 9.5 g to moles using the molar mass of NaOCl:

9.5 g NaOCl/180.16 g NaOCl = 0.1276 mol

Then you divide the number of moles by liters to find molarity:

0.1276 mol/1 L = 0.1276 M

The plants and animal cells are different because:

-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright

-Plant cells have cell walls to provide a stronger external structure and animal cells do not.

-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.

In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.

Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.

Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.

A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.

Although a part of your question is missing, you might be referring to this question:

Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.

Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright

Animal cells contain a nucleus and plant cells do not

Plant cells have cell walls to provide a stronger external structure and animal cells do not.

Plant and animal cells are both completely the same and they have no differences.

Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.

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Because of Avogardo Hypothesis, volumes can be used in gas phase reaction stoichiometry at constant temperature and pressure.

Avogadro's Law (also known as Avogadro's Hypothesis or Avogadro's Principle) is an experimental gas law that relates the volume of gas to the amount of gaseous matter present.

Avogadro's law states that "equal volumes of all gases at the same temperature and pressure have the same number of molecules". At constant temperature and pressure, (mol) of a gas is directly proportional.

For example, if two ideal gases, hydrogen and nitrogen, are mixed in equal amounts, they contain the same amount of molecules. This only happens if they are kept at the same pressure and temperature. This shows the ideal behavior of gases.

Let's look at this law mathematically: the overall law can be written as

V is directly proportional to n

or V = nK , K (a constant)

Amount of gas; “n” is the gaseous substance measured in moles. "k" is a constant defined for a specific pressure and temperature.

Comparing the same gas under different conditions, the law is : V₁/ n₁=V₂/ n₂

The equation shows that the number of moles of gas increases in proportion to the increase in gas volume. Therefore, the total number of atoms or molecules present in a given volume of gas is completely independent of the molar mass or size of the gas.

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The net ionic equation for the reaction between agno3aq and na2so4aq would be 2Ag+(aq)  + SO4^2-(aq) → Ag2SO4(s)

The net ionic equation shows the chemical species involve in the chemical reaction while the complete ionic equation also involves the spectator ions. The net ionic equation state whether precipitation occurs or not. If the chemical reaction has no net ionic equation it means all are aqueous from no precipitation occurring.

AgNO3 → Ag+ + NO3-

Na2SO4 → 2Na+ + SO4^2-

2AgNO3(aq) + Na2SO4(aq) → 2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq)

2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq) → Ag2SO4(s) + 2NaNO3(aq)

2AgNO3(aq) + Na2SO4(aq) → Ag2SO4(s) + 2NaNO3(aq)

We cancel the spectator ions  (NO3^-  and Na^+)

the net ionic equation with states of matter is:

2Ag+(aq)  + SO4^2-(aq) → Ag2SO4(s)

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The distance that will be traveled by me on the US interstate system will be 403.3 km.

Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.

To calculate the distance traveled;

d = Vt

Where;

d = Distance traveled by me

V = Maximum speed

t = Time

Given:

V = 121 km/h

t = 3 hours 20 minute = 10/3 hours

Substituting the values in the formula

d = 121×10/3

d = 403.3 km

In conclusion, the distance traveled by me will be 403.3 km.

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Answer:

You might get nervous and anxiety about meeting up in society

The statement true about Exothermic reaction is

The reactants have more heat energy than the products.

What is exothermic reaction ?

A chemical reaction that releases energy is called exothermic. In an exothermic reaction, more energy is released forming a bond in the product than is used to break the bond in the reactants. An exothermic reaction is accompanied by an increase in temperature of the reaction mixture.

If a reaction releases more energy than it absorbs, the reaction is exothermic and enthalpy will be negative. Think of this as an amount of heat leaving (or being subtracted from) the reaction. If a reaction absorbs or uses more energy than it releases, the reaction is endothermic, and enthalpy will be positive.

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Methane is the common name for methane. In the organic molecule, it is the simplest hydrocarbon and a hydride of carbon. Tetrahedral in shape and with an exact bond angle of 109.50 in Lewis structure.

The methane molecule has the Lewis structure, Dots are used to indicate the positions of electrons surrounding the atoms in a molecule, while lines or pairs of dots are used to represent covalent connections between atoms in a Lewis structure. The goal of creating a Lewis dot structure is to locate the molecules' lone electron pairs in order to establish how chemical bonds are formed. Natural gas's primary component and the simplest alkane is methane, a chemical molecule with the molecular formula methane (one carbon atom bound to four hydrogen atoms).

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0.021 moles of KCN are required, to prepare a buffer with a pH of 9.230

A buffer, an aqueous solution consists of a mixture of a weak acid and its conjugate base or vice versa. Addition of a small amount of strong acid or strong base hardly changes the pH.

Given,

Volume = 125 mL

Concentration of HCN = 0.420 M

pH = 9.230

Moles of HCN = Volume × Concentration

= 0.125 × 0.420

= 0.0525 moles

HCN + KOH ⇄ KCN + H₂O

0.0525 + X   ⇄    0                     [initially]

(0.0525 - X) + 0  ⇄ X                  [At equilibrium]

pH = pKₐ + log [salt]/[acid]

9.230 = 9.31 + log [salt]/[acid]

-0.08 = log [salt]/[acid]

0.83 = [salt]/[acid]

X / (0.0525 - X) = 0.83

X = 0.021 moles of KCN

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Answer:

the answer would be more than 2.5g

Explanation:

The volume of a 2.0 m solution of NaOH needed to prepare 494.4 ml of a 0.15 m solution of NaOH is 37.08 ml.

Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.

C₁V₁ = C₂V₂

where C₁ = initial concentration of sample = 2.0 m

V₁ = initial volume of sample

C₂ = final concentration after dilution = 0.15 m

V₂ = total final volume after dilution = 494.4 ml

Plug in the values to the formula and solve for the volume of the solution needed.

V₁ = C₂V₂/C₁

V₁ = (0.15 m)(494.4 ml)/(2.0 m)

V₁ = 37.08 ml

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The ions are present in cations and anions.

The cathode Positively charged cations.

The anode is negative ions.

The oxidation occurs is Zn(s) = Zn2+ (aq) + (2e-).

A redox reaction combines two half-reactions into one complete formula. Electrons lost in the oxidation half-reaction are gained in the reduction half-reaction. Thus, a redox reaction is a chemical reaction in which electrons are transferred between the two species.

A substance that is reduced in a chemical reaction is called an oxidizing agent and a substance that is oxidized is called a reducing agent. Example of the redox reaction of zinc and copper. A reaction is complete when it reaches equilibrium, that is when the concentrations of reactants and products stop changing. If the equilibrium constant is very large.

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The molarity of the HCl 0.104 M

Molarity of a solute is defined as the ratio of number of moles of solute to the volume of solution (L). Solute molarity is sometimes omitted by enclosing the solute chemical formula in square brackets. For example, the concentration of chloride ions in solution can be written as  [Cl⁻]. Molarity allows you to convert between the volume of a solution and the moles (or mass) of a solute.

For the given case,

HCl + NaOH --> NaCl + H2O

Since,

M₁V₁ = M₂V₂

M₁ = concentration of NaOH

V₁ = volume of NaOH

M₂ = concentration of HCl

V₂ = volume of HCl

Substitute the given values in the equation mentioned above:

26.18 × 0.0995 = M₂ × 25.00

2.60491 = 25 M₂

M₂ =  0.104 M

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11.10 moles of cacl2 are required

Lets 0.24000000000000002m approx. be 0.2m

so, Molarity = 0.2m

volume = 500 ml

we know that

molarity = no. of moles of solute (cacl2) / volume of solutions

0.2m = n / 0.5 L

n = 0.1 moles of cacl2

now,

1 mole of cacl2 = 110.98 gm

so,

o.1 moles of cacl2 = 11.10 gm

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The predicted electron geometry is a trigonal planar geometry.

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The mass of silver chloride produced is 24.79g.

Given,

volume = 1.11 L

Molarity = 0.156 M

First, convert molarity to moles by multiplying by the volume:

0.156 M AgNO3 = (0.156 moles AgNO3)/1 L x 1.11 L = 0.173 moles AgNO3

We are only interested in AgCl, not AgNO3. We convert moles of silver nitrate to moles of silver chloride using the balanced equation. This is a 1:1 conversion:

0.173 moles AgNO3 x (1 mole AgCl)/(1 mole AgNO3) = 0.173 moles AgCl

To get mass from moles, we multiply by the molar mass:

0.173 moles AgCl x (143.32 g/mol) =  24.79 g AgCl

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Alkali carbonates are soluble in water so (NH₄)2CO₃ sodium carbonate and potassium carbonates are soluble in water.

A composite is a material comprised of two or more constituent parts. Examples of molecules are carbon dioxide, freshwater, and table salt. a substance produced by the chemical joining of two or three dissimilar components. Examples of compounds are salt (NaCl), which is made up of chloride and sodium atoms, and water (H2O), which would be made up of hydrogen and oxygen atoms.

When a group of atoms unite to form a pure material, a compound is created. These can be reduced to their individual atoms. Atoms from the reactants interact during chemical reactions to create new compounds. Reactants are the species that are reacting, while products are the results of the reaction.

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In aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as H₃O (aq) then name of the H₃O ion is hydronium ion

The hydrogen ion in aqueous solution is no more than proton and a bare nucleus although it carries only a single unit of positive charge and this charge is concentrated into a volume of space that is only about a hundred million as large as volume occupied by smallest atom in case of water this will be the lone pair electron of the oxygen atom and the tiny proton will be buried within the lone pair and will form a shared electron bond with it and creating a hydronium ion means H₃O⁺ and here H₂O is the base and the product H₃O⁺ is the conjugate acid of water

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