How many electrons must you add to Boron-10 to create a neutral atom? How many electrons must you add to Boron-11 to create a neutral atom? Why?

it is tecnically magnesium,

Answer:

barium is the answer

The physical mechanism causing the change in strength when using brine as the pore fluid is the presence of salt ions that weaken the interparticle bonds. Salt can reduce the shear strength of clays by increasing the repulsive forces between clay particles.

The strength of clay types at 50% water content can vary depending on whether DI water or brine is used as the pore fluid. Generally, there is a significant difference in strength between the two.

The presence of salt in brine can have an effect on the shear strength of clays. When salt is dissolved in water, it creates ions that can interact with the clay particles. These interactions can lead to the formation of electrical double layers around the clay particles, which can increase the interparticle repulsion and decrease the shear strength of the clay.

On the other hand, when DI water is used as the pore fluid, there is no presence of salt ions to affect the interparticle interactions. As a result, the clay particles can have stronger bonds and higher shear strength compared to when brine is present.

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Magnesium oxide : MgO

Calcium bicarbonate:  Ca(HCO3)2

aluminum carbonate: Al2(CO3)3 or C3Al2O9

Answer: The layers of the rocks in one region of the parks are smooth and distinct, which are evidence of many, many years of deposition. The layers on the rocks are because of different deposition of sediments. Different sediments deposited over the rocks through wind, water and ice over the ages

Explanation:

Answer: The layers of the rocks in one region of the parks are smooth and distinct, which are evidence of many, many years of deposition. The layers on the rocks are because of different deposition of sediments. Different sediments deposited over the rocks through wind, water and ice over the ages

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The Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.

As given in the problem we have to find out how much PE would a 100 kg man have on a sled at the top of the hill.

The potential energy of the man = 100 × 9.8 × H

                                                      = 980H

Both mass and acceleration due to the gravity of the earth are constant and the only variable is the height of the inclined surface.

Thus, a ball rolling down an incline has its maximum potential energy at the top, therefore the correct answer is option D.

Thus, the Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.

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Answer:

58.33 g/mol

Explanation:

The correct statement is option B - A redox reaction involves either the transfer of an electron or a change in oxidation state of an element.Redox reactions involve the transfer of electrons from one substance to another.

The term "redox" refers to the simultaneous oxidation and reduction of molecules in the reaction, with one molecule losing electrons and the other gaining electrons.

Redox reactions is:Oxidation: Loss of electronsReduction: Gain of electrons. A molecule or atom that loses electrons is said to be oxidized, while one that gains electrons is said to be reduced.

The oxidized substance is an oxidizing agent, while the reduced substance is a reducing agent.

The statement "A redox reaction involves either the transfer of an electron or a change in oxidation state of an element" is true as the redox reaction involves both reduction and oxidation reactions.

Any substance that is oxidized should be reduced by another substance, and vice versa. Thus, a redox reaction involves the transfer of electrons from one substance to another.

Although oxygen is often present in redox reactions, it is not a necessary component of them. So, the statement C is false, and oxidation can not occur independently of reduction, so the statement A is false too.

The reducing agent reduces another substance and is itself oxidized; thus, statement D is also true.

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Yes, it is possible to make an aqueous solution of strontium hydroxide that gives a pOH of 10.54 because of thr Sr ions in the solution.

First, we can use the relationship between pH and pOH,

pH + pOH = 14

Since we want a pOH of 10.54, we can solve for the pH,

pH = 14 - pOH

pH = 14 - 10.54

pH = 3.46

Next, we can use the ionization constant expression for strontium hydroxide,

Sr(OH)₂(s) → Sr²⁺(aq) + 2OH⁻(aq)

Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴

Hence, the concentration will be given as,

[OH⁻] = 2[Sr²⁺]

Substituting this expression into the Kw expression, we get,

Kw = [H⁺][OH⁻] = [H⁺] (2[Sr²⁺])

1.0 x 10⁻¹⁴ = [H⁺] (2x)

where x is the molar concentration of strontium ions.

Solving for x, we get,

x = 1.0 x 10⁻¹⁴ / 2

x = 5.0 x 10⁻¹⁵

Therefore, the molar concentration of strontium ions in solution is 5.0 x 10⁻¹⁵ M.

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The pKa of acetic acid is 4.8, the result of adding 1 mL of 0.1 M HCl to a 0.1 M acetate buffer at a pH of 5.0 is:

C. The pH would drop significantly.

Acetic acid (CH₃COOH) is a weak acid that partially dissociates in water, releasing hydrogen ions (H⁺). In an acetate buffer solution, acetic acid and its conjugate base, acetate (CH₃COO⁻), are present in equilibrium:

CH₃COOH ⇌ H⁺ + CH₃COO⁻

The equilibrium is governed by the acid dissociation constant, represented as Ka. The pKa of acetic acid is given as 4.8. The pKa is the negative logarithm of the Ka value.

When a strong acid, such as HCl, is added to the acetate buffer solution, it introduces a large concentration of additional H⁺ ions. This disturbs the equilibrium between acetic acid and acetate, shifting it towards the formation of more undissociated acetic acid. Consequently, the concentration of H⁺ ions increases, causing a significant drop in pH.

Since the initial pH of the acetate buffer is 5.0, which is higher than the pKa of acetic acid (4.8), the buffer is in a partially deprotonated state. Adding HCl, a strong acid, disrupts the balance between the acid and its conjugate base, resulting in a more acidic solution and a significant decrease in pH.

Therefore, option C, "The pH would drop significantly," is the likely result of adding 1 mL of 0.1 M HCl to the 0.1 M acetate buffer at a pH of 5.0.

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Explanation:

density can be changed by changing either the pressure or the temperature. Increasing the pressure always increases the density of a material. Increasing the temperature generally decreases the density, but there are notable exceptions to this generalization.

A characteristic of a base is that it increases the amount of hydroxide ions (OH-) in a solution, not the amount of hydrogen ions (H+). Therefore, the response "increases amount of hydrogen ions" is incorrect.

Bases are indeed slippery to the touch, so the response "is slippery" is a characteristic of a base.

Contrarily, bases often cause the litmus paper to become blue rather than red. To evaluate if a chemical is acidic or basic, people frequently use litmus paper as an indicator. Litmus paper is coloured red by acids and blue by bases. As a result, the answer "turns litmus paper red" is untrue.

Last but not least, bases are known to taste soapy or bitter rather than sour. On the other hand, acids have a sour flavour. As a result, the answer "tastes sour" is untrue.

In conclusion, the accurate definition of a base is a substance that makes a solution contain more hydroxide ions (OH-) and is slippery to the touch.

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Answer:

Metamorphic rocks can also be formed in ocean floors.

Explanation:

The ocean floor is made up predominantly of basalts and are derived by the cooling an solidification of magma in this environment.

Answer: a is incorct

Explanation:

Answer:Open this pdf if has the answers

Explanation:

Answer:

I think it mught be 12.9?

Answer:

the average sum of kinetic energy of all the molecules present in a body is called temperature. it's 12.9

hope it is helpful to you

Lithium has 3 protons in the nucleus.

Atomic number =number of protons =number of electrons

According to the question,

we have been given atomic number= 3

So, number of protons will be 3 and number of electrons will also be 3.

We can additionally calculate number of neutrons as follows-

number of neutrons= mass number - number of protons

                                   = 6.941 - 3

                                   ≈ 4

Hence, the number of protons in lithium will be 3.

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The nucleus of Lithium has three protons.

The number of protons or electrons in the nucleus of a neutral atom is known as its Atomic number.

The total mass of an atom's protons and neutrons is known as its mass number. (neutrons and protons added together Equals nucleons)

Atomic mass= Mass number + Neutrons

Atomic number equals the sum of the protons and electrons

Since, atomic number given is 3

Therefore, protons in the nucleus will be 3.

Additionally, we may determine the neutron number using the formula below.

mass number = number of neutrons + number of protons

⇒ 6.941 = number of neutrons + 3

⇒ number of neutrons will be approximately 4.

Thus, lithium will contain three protons.

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Chemicals are substances made up of one or more atoms with unique physical and chemical properties, and every chemical has a formula, but not all naturally occurring chemicals are safe.

A chemical is a substance made up of one or more atoms that are chemically bonded together, with a unique set of physical and chemical properties.

Yes, every chemical has a chemical formula that describes the types and numbers of atoms present in the molecule or compound.

In the past, we have used chemicals that we thought were safe that have turned out to cause harm, such as lead.

To prevent repeating mistakes, it is important to conduct thorough research and testing on chemicals before they are used, and to continue monitoring their effects over time.

Regulations and guidelines can also be put in place to ensure that chemicals are used safely and responsibly.

The decision to ban or destroy a chemical depends on its level of toxicity and potential harm to humans and the environment.

In some cases, it may be necessary to ban or restrict the use of a chemical, while in others, it may be sufficient to implement safety measures and precautions.

No, not all naturally occurring chemicals are safe. Many toxic substances such as arsenic, mercury, and cyanide occur naturally in the environment and can be harmful to living organisms.

Chemicals should be evaluated based on their potential toxicity and risks, regardless of whether they are naturally occurring or synthetic. The source of a chemical does not necessarily determine its safety or toxicity.

References:

- National Institute of General Medical Sciences. (2021).

- Chemical Safety Facts. (n.d.). Chemical formulas.

- National Institute of Environmental Health Sciences. (2021).

- Environmental Protection Agency. (2021).

- United States Geological Survey. (2021). Naturally occurring contaminants.

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Answer:

Oxygen has a molar mass of 16.0 g mol−1 , so 1 mole of oxygen atoms has a mass of 16.0 g . Therefore, carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you get 72.7 g of oxygen

Explanation:

Based on the given information, it is not possible to determine whether the reaction was conducted in an open or a closed system.

The mass of the reactants (47 grams of baking soda and 13 grams of vinegar) and the mass of the product (56 grams) are provided, but there is no information about the container or the environment in which the reaction took place.

In an open system, matter can enter or leave the system, while in a closed system, matter is not allowed to enter or leave the system. Without knowing the type of system in which the reaction was conducted, it is not possible to determine whether any matter (e.g. gas) entered or left the system during the reaction.

Therefore, it cannot be concluded whether the reaction was conducted in an open or a closed system based on the given information.

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To calculate the pOH of HCl, we first need to use the relationship between pH and pOH, which is pH + pOH = 14. Therefore, if HCl has a pH of 1.3, we can calculate the pOH as follows:

pH + pOH = 14
1.3 + pOH = 14
pOH = 14 - 1.3
pOH = 12.7
Therefore, the pOH of HCl is 12.7.
So, you can find the pOH by subtracting the given pH from 14. In this case, the pOH is 14 - 1.3 = 12.7. Therefore, the pOH of the HCl solution is 12.7.

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The molar mass of KOH is 56.11 g/mol, and the molar mass of H2 is 2.02 g/mol. The mass of KOH produced by the reaction of one mole of potassium and one mole of water is 56.11 g, and the mass of H2 produced by the reaction of one mole of potassium and one mole of water is 2.02 g.

The equation indicates that two atoms of potassium react with two molecules of water to form two molecules of potassium hydroxide and one molecule of hydrogen gas.

This implies that the ratio of moles of potassium to water is 1:1, and the ratio of moles of potassium hydroxide to hydrogen is 2:1. The molar mass of K is 39.10 g/mol, and the molar mass of H2O is 18.02 g/mol. Thus, the mass of K that reacts with one mole of water is 39.10 g. Similarly, the mass of water that reacts with one mole of potassium is 18.02 g.

The equation relates the relative numbers of representative particles (atoms, molecules) and moles of reactants and products, as well as the masses of reactants and products involved in the reaction. This provides a basis for quantitative analysis of the reaction, such as determining the amount of product produced from a given amount of reactants.

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Answer:

is behavior

Explanation:

becuase behavior can be affected on the eviroment we are in

Our behavior is affected by physical environment.

Individuals live, study, work, even play in their external surroundings. People's physical environments are influenced by the air those who breathe, the water they consume, the homes they reside in, and the vehicles they need to get to school and work.

The way someone acts was referred to as their behavior. That's what a person must do to make things happen, modify something, and maintain the status quo.

Our behavior is affected by physical environment.

Therefore, the correct answer will be option (c)

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The two-sided confidence interval is (87.85 ≤ μ ≤ 93.11) , with 87.85 being the lower level and 93.11 being the upper level.

The amount of product you actually get after doing an experiment is known as the experimental yield. Calculating the % yield will show you how much of the theoretical yield you actually achieved in a particular experiment. The quantity of pure and dry product produced in a chemical reaction is known as the reaction yield (absolute yield). The relative or percentage yield (%) is typically determined in order to assess the effectiveness of a chemical process in organic synthesis.

The percent yield can be calculated by applying the following formula:%yield = (actual yield/theoretical yield) x 100.

Step-by-step explanation:

Given the data:

91.6, 88.75, 90.8, 89.95, 91.3

Mean, m = Σx / n

n = sample size = 5

Mean = 452.4 / 5 = 90.48

Standard deviation, σ = 3

Zcritical at 95% = 1.96

Confidence interval :

Mean ± Error margin

Error margin = Zcritical*σ/sqrt

Error margin = 1.96 * 3/sqrt(5)

Error margin = 2.630

Lower boundary : 90.48 - 2.630 = 87.85

Upper boundary : 90.48 + 2.630 = 93.11

(87.85 ; 93.11)

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The  energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength. The formula for calculating the energy of a photon is E = hc/λ, where E is the energy in joules, h is Planck's constant (6.626 x 10^-34 J.s), c is the speed of light (3 x 10^8 m/s), and λ is the wavelength in meters.

To convert the wavelength of 1.25 cm to meters, we need to divide it by 100, which gives us 0.0125 m. Now we can use the formula to calculate the energy of the microwave photon ,E = hc/λ E = (6.626 x 10^-34 J.s) x (3 x 10^8 m/s) / 0.0125 m ,E = 1.682 x 10^-20 J .To convert joules to electronvolts (eV), we need to divide the energy by the elementary charge (1.602 x 10^-19 C) and multiply by 10^-3 to convert to millielectronvolts (meV) E = 1.682 x 10^-20 J / (1.602 x 10^-19 C) x 10^-3 ,E = 0.105 meV ,Therefore, the energy of the microwave photon with a wavelength of 1.25 cm is 0.105 meV.

To find the energy of a microwave photon, we'll use the equation E = (hc)/λ, where E is the energy of the photon, h is Planck's constant (6.626 x 10^-34 Js), c is the speed of light (3 x 10^8 m/s), and λ is the wavelength of the microwave. Convert the wavelength from cm to meters. 1.25 cm = 0.0125 m. Calculate the energy in Joules using the equation E = (hc)/λ. E = (6.626 x 10^-34 Js x 3 x 10^8 m/s) / 0.0125 m E ≈ 1.595 x 10^-23 J .

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Answer:

It would be the chloride ion, with a charge of

1

−

.

Explanation:

A neutral chlorine atom has the electron configuration

1s

2

2s

2

2p

6

3s

2

3p

5

. In an ionic compound, chlorine gains the sixth

3p

electron, most likely when reacting with a metal such as sodium (Na), forming the chloride ion,

Cl

−

.

The image below represents the formation of the ionic compound sodium chloride,

NaCl

. The bond is formed by the electrostatic attraction between the positive and negative ions.

The pH required to reach the equivalence point is = 8.536m

pH is a measure of hydrogen ion attention, a measure of the acidity or alkalinity of a result. The pH scale generally ranges from 0 to 14. Waterless results at 25 °C with a pH lower than 7 are acidic, while those with a pH less than 7 are introductory or alkaline.

mol of base = MV

                        = 29.8 × 0.3567

                            = 10.629m

mol of acid = 10.629

then                                   M =m mol/V

                                   = 10.629/25

                                      = 0.42516 M of HA

then                Vt = Vt+V1

                           = 25+29.8

                         = 54.8 mL

then A- + H"O & lt;-> HA + OH-Kb = [HA][OH-]/[A-]Kb

= Kw/KA= (10⁻¹⁴)/(1.8 ˣ 10⁻⁴)

= 5.55 × 10⁻¹¹Kb

= [HA][OH-]/[A-]Kb

= x*x/(M-x)5.55 × 10⁻¹¹

= x*x/(0.42516/2 -x)x

= Oh- = 3.43 × 10⁻⁶ OH

= -log( 3.43 × 10⁻⁶)

= 5.464ph

= 14 - 5.464

Therefore the pH = 8.536

point in titration at which the quantum of titrant added is just enough to fully neutralize the analyte result. At the equivalence point in an acid- base titration, intelligencers of base = intelligencers of acid and the result only contains swab and water. The equivalence point, or stoichiometric point, of a chemical response is the point at which chemically original amounts of reactants have been associated. For an acid- base response the equivalence point is where the intelligencers of acid and the intelligencers of base would neutralize each dissimilar corresponding to the chemical response

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Answer: Bacteria, some insects, and fungal species are the decomposers of the dead and decaying matter.

Explanation:

The decomposers are the organisms which act and feed on the dead and decaying organic matter so as to obtain energy from it and degrade it to the simple forms that can be utilized by the plants. Bacteria, some insects and fungi that live in the soil and on the decaying matter. The fungi for example decay on the lignin present in the wood so helps in wood decomposition of trees. If the decomposer like fungi are absent the wood mass will not decompose and it will remain as waste and can be used by the plants in the form of nutrients.

Answer:

m = 46593.6 g

Explanation:

Given data:

Mass of mercury = ?

Volume of mercury = 3426 mL

Density of mercury = 13.6 g/mL

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

by putting values,

13.6 g/mL = m/ 3426 mL

m =  13.6 g/mL × 3426 mL

m = 46593.6 g