Of all boron atoms, 19.9%% are boron-10, which have a mass of 10.01294 amu. The other 80.1% of boron atoms are boron-11 and these have a mass of 11.00931. Calculate the average atomic mass of boron.

Answer:

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The study of variation and inheritance is called genetics.  "Inheritance being defined as a technique through which the qualities and attributes are passed

The term 'Inheritance' comes a contraction of the word "Inherit" that means, "to inherit any trait, attributes or traits from family". Therefore, "Inheritance being defined as a technique through which the qualities and attributes of the super class or even other derived classes are passed down to the sub or child class.

It also has the ability to take characteristics first from child class and use them in other derived classes." The study of variation and inheritance is called genetics.

Therefore, the study of variation and inheritance is called genetics.

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Matter is anything that has mass and occupies space.

An example of matter is oxygen gas. It is a gas that has a definite volume and can be measured in terms of its mass. Other examples of matter include solids like rocks and metals, liquids like water and oil, and gases like helium and nitrogen. An example of matter is oxygen gas. Matter refers to any substance that has mass and occupies space, and oxygen gas fits this description. In contrast, light and heat are forms of energy, not matter, so they are not suitable examples. In this multiple-choice question, the correct answer would be oxygen gas, as it is a tangible substance with mass and volume, distinguishing it from the other options presented.

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Answer:

225.0mL

Explanation:

Volume and Pressure are inversely related. So if the pressure is doubled the volume will be half of its original volume.

Answer: By the very laws of the universe, matter cannot be created or destroyed, the Big Bang cannot have happened by its own power. There was a creator involved.

The molecular formula of the compound is (C1H1.33O1). To simplify this we can use the lowest whole number ratio. The molecular formula will be (C1H4O1), which means that the compound is composed of 1 Carbon, 4 Hydrogen and 1 Oxygen atoms.

To determine the molecular formula of the compound, we need to determine the number of moles of each element present in the sample, and then use that information to calculate the ratio of atoms in the compound.

First, we'll convert the masses of carbon, hydrogen, and oxygen to moles using the molar mass of each element:

Carbon: 283.4 g / 12.01 g/mol = 23.51 mol

Hydrogen: 31.7 g / 1.01 g/mol = 31.4 mol

Oxygen: 377.4 g / 16.00 g/mol = 23.59 mol

Next, we'll use the molar ratios to determine the ratio of atoms in the compound:

Carbon: 23.51 mol / 23.51 mol = 1

Hydrogen: 31.4 mol / 23.51 mol = 1.33

Oxygen: 23.59 mol / 23.51 mol = 1

So the molecular formula of the compound is (C1H1.33O1). To simplify this we can use the lowest whole number ratio. The molecular formula will be (C1H4O1), which means that the compound is composed of 1 Carbon, 4 Hydrogen and 1 Oxygen atoms.

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This creates a total of six electrons in the bonding molecular orbitals, giving the bond order of 2.5.

Molecular is the level of organization that deals with atoms and molecules. At this level, we are looking at the chemical structure of matter. Molecules are formed when atoms of different elements bond together to form a single unit.

The molecular orbital diagram for N2 consists of two valence orbitals, a 2s orbital and a 2p orbital. Each atom contributes one electron to the 2s orbital and three electrons to the 2p orbital. The electrons in the 2s orbital are paired, while the electrons in the 2p orbital are unpaired.
The molecular orbital diagram for N2 is as follows:
2s orbital:
e- ↑↓
2p orbital:
e- ↑  ↑  ↑
The bond order of N2 is 2.5, which indicates that it is a strong triple bond. This is because the 2s and 2p orbitals overlap to form three bonding molecular orbitals, each containing two electrons. This creates a total of six electrons in the bonding molecular orbitals, giving the bond order of 2.5.

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Answer:

B- how much time it took a fossil to form

Explanation:

To determine the ages in years of Earth materials and the timing of geologic events such as exhumation and subduction, geologists utilize the process of radiometric decay.

Answer:

False

Explanation:

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

This question is reffering to sedimentary rocks, so it's false.

Answer:

Weathering (breaking down rock) and erosion (transporting rock material) at or near the earth's surface breaks down rocks into small and smaller pieces. When the molten rock cools it forms an igneous rock. Metamorphic rocks can form from either sedimentary or igneous rocks.

Explanation:

True

Answer:

Where are the answer choices

?

Starch is a complex carbohydrate that is primarily made up of glucose molecules.

It is made up of many molecules that are connected together to form a long chain or polymer.

Starch is a polysaccharide, which means it is made up of many monosaccharide (simple sugar) molecules joined together.
The glucose molecules in starch are joined together by alpha-glycosidic linkages.

Starch is comprised of hundreds and perhaps thousands of glucose molecules.

The number of glucose molecules in a starch molecule can vary, but the average size of a starch molecule is around 1,000 glucose molecules.
Starch is an important food source for humans and other animals.

It is found in a variety of foods, including potatoes, rice, bread, and pasta.

When we eat foods that contain starch, our bodies break down the starch into glucose molecules that can be used for energy.
In conclusion, starch is comprised of hundreds and perhaps thousands of glucose molecules.

Starch is an important food source for humans and other animals.

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Answer:

but purely citric acid synthetic Acid whose moller mass is equal to 192 g per mole. Okay, so here we have Modernity is even McGarity is equal to 0.5 M and we have volume, so Volume is equal to 200 mililiters  is equal to 0.1 liter  Okay, so they are asking to calculate the mass of what u have  Okay. So first of all, if we want to calculate the mass of then we have to calculate the number of moles. So maturity is equal to the number of moles per volume in liters . So you mean zero point sorry from this one number of moles is equal to So N is equal to m multiplied very weak. So that is equal to 0.1 and 0.5. So that is equal to 0.05 moles. Okay, now the mask is equal to the mass of cool eh is equal to the number of Okay. Number of 0.5 and it is multiplied by 92 g per mole. Then it is equal to 9.6 g. So this is the mass of a present. A 0.500 ml

Cap-and-trade programs are the current best strategy, resulting in the greatest decline, in reducing sulfur dioxide from this industrial emission.

The commercial process emits huge quantities of organic compounds carbon monoxide, hydrocarbons, and chemicals into the air. A high amount of carbon dioxide is the motive for the greenhouse impact inside the air.

Greenhouse gas emissions from enterprises mainly come from burning fossil fuels for electricity, in addition to greenhouse gas emissions from certain chemical reactions important to provide items from raw materials.

Burning fossil fuels like oil, natural gas, and petroleum; chemical solvents utilized in dyeing and tanning industries, untreated gas and the liquid waste being released into the surroundings, mistaken disposal of radioactive material are a number of the primary reasons for industrial pollution.

there are many methods to reduce greenhouse gas emissions from the commercial region, such as electricity efficiency, fuel switching, blended warmth and power, use of renewable electricity, and the extra efficient use and recycling of materials.

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Answer:

Pressure= 2 atm

temperature= 273K

volume= 44.8cm

3

=44.* litre

so,By PV=nRT

n=

RT

PV

mole=

0.0821×273

2×44.8

so, no of moles= 3.998=4

hence, 4×6.023×10

23

=24.08×10

23

Explanation:

if this answer is correct make me as brainlelist

At STP, one mole of every elements or molecules contains a volume of  22.4 L. Hence, a volume of 44.8 L of oxygen gas is 2 moles thus weighs 64 g.

STP is the condition of standard temperature and pressure.  A temperature of 298 kelvin and 1 atm pressure is referred to as standard temperature and pressure or STP.

At standard temperature and pressure, one mole of every compound or molecule contains 22.4 liters of the substance. We know that one mole of O₂ gas is 32 g/mol. 32 g of oxygen gas contains 22.41 liters.

The number of moles of 44.8 liters of oxygen is = 44.8/22.4 = 2 moles.

One mole of oxygen gas is 32 g. Hence, 2 moles are 64 g. Hence, the mass in grams of 44.8 oxygen is 64 g.

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Answer:

I don't know

Explanation:

pls I need a little bit answer

The incorrect statement will be; When possible use radioactive substances with half-lives is less than 120 days, when it comes to minimizing the hazardous waste. Option A is correct.

The recommended approach for minimizing hazardous waste is to use radioactive substances with shorter half-lives, which will result in less long-term radioactive waste. The half-life of a substance is the time it takes for half of the material to decay radioactively, and substances with shorter half-lives decay more rapidly, producing less waste over time.

Out of the given options, the best approach is to use radioactive substances with half-lives less than 60 days, as this will result in the least amount of long-term radioactive waste. Option B is incorrect. When it comes to minimizing hazardous waste, it is preferable to use radioactive substances with shorter half-lives.

This is because shorter half-lives result in less radioactive waste being generated over time. Therefore, the correct statement is "When possible use radioactive substances with half-lives is less than 40 days."

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"Which of the following statements below is incorrect when it comes to minimizing hazardous waste? A)When possible use radioactive substances with half-lives less than 120 days B) When possible use radioactive substances with half-lives less than 40 days C) When possible use radioactive substances with half-lives less than 60 days D) When possible use radioactive substances with half-lives less than 30 days."--

Answer:

The enthalpy of solution for AgNO3 is positive because the temperature of the solution decreases (the dissolution is endothermic). Hsol = Hsolute + Hsolvent + HmixHsolute and Hsolvent are endothermic because energy is required to overcome intermolecular forces and separate solute and solvent particles.

Answer:

the enthalpy of solution for agno3 is positive because the temperature of the solution decreases. (the dissolution is endothermic.)

Delta H sol=delta HSolute +delta H solvent +delta H mix

HSolute and H solvent are endothermic because energy is required to overcome intermolecular forces and separate solute and solvent particles.

H mix is exothermic because energy is released when intermolecular forces form between solute and solvent particles.

if the overall enthalpy of solution is positive, then HSolute + H solvent must be larger in magnitude than H mix.

Explanation:

correct on edge2021

Answer:

dic

Explanation:

Answer:

 Number of molecules = 1.25 x 10 30 molecules

 Avogadro’s number = 6.022 x 10 23

 Number of moles = ?

 Formula

 Number of moles = 1.25 x 10 30

6.022 x 10 23

= 2.07 x 106 moles

Explanation:

As per the balanced reaction given, 4 moles of ammonia reacts with 6 moles of NO. Therefore, the number of moles of NO required to react with 2.45 moles of ammonia is 3.46.

Nitric oxide is a covalent compound formed from the electron sharing between nitrogen and oxygen atom. Nitric oxide is a common gas found in atmosphere.

NO reacts with ammonia gas produces nitrogen gas and water as per the balanced chemical equation given. It is clear that 4 moles of ammonia reacts with 6 moles of NO.

The number of moles of NO required to react with 2.45 moles of ammonia is calculated as follows:

number of moles of NO  = 2.45 × 6 /4 = 3.46.

Therefore, 3.46 moles of NO is required to completely react with 2.45 moles of ammonia.

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The wavelength of the emitted photon is approximately 2.44 μm.

The wavelength of the emitted photon can be determined using the Rydberg formula as follow

\(\frac{1}{\lambda}=R_H\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)\)

where: lambda is the wavelength of the emitted photon,

\(R_H=1.0974\times10^7\text{m}^{-1} ,$n_1=19 n_2=5 :\frac{1}\)

\({\lambda}=R_H\left(\frac{1}{19^2}-\frac{1}{5^2}\right) \frac{1}\\\\\\{lambda}=1.0974\times10^7\text{m}^{-1}\left(\frac{1}{361}-\frac{1}{25}\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\left(0.002709-0.04\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\times(-0.037291) \frac{1}{\lambda}=-409446.34\text{m}^{-1} \lambda=-\frac{1}{409446.34\text{m}^{-1}}=2.44\times10^{-6}\text{m}\)

Therefore, the wavelength of the emitted photon is approximately 2.44 μm.

Rounded to two decimal places, this value is equal to 2.45 μm. Thus, the correct option is A) 2.45μm.

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Rain in New England is 2.57 times more acidic than rain in the Midwestern United States.

The acidity of a solution depends on the concentration of H⁺ ions ([H¹⁺ ]). This concentration can be calculated from pH using the following formula:

pH = -log([H⁺])

american midwest

pH = -log([H⁺])

5.07 = -log([H⁺])

[H⁺] = antilogarithm (-5.07) = 8.51 × 10⁻⁶ M

new england

pH = -log([H⁺])

4.66 = -log([H⁺])

[H⁺] = antilog (-4.66) = 2.19 × 10⁻⁵ M

The concentration ratios are:

\(\frac{2.19 \times 10^{-5} M}{8.51 \times 10^{-6} M} =2.57\)

Rain in New England is 2.57 times more acidic than rain in the Midwestern United States.

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Answer:

C. Endothermic

Explanation:

Since the products potential energy is higher than the reactants potential energy, it has abosrbed energy, thus making the graph endothermic.

Answer:

254.35 g of NaCl.

Explanation:

We'll begin by writing the balanced equation for the reaction between sodium (Na) and chlorine (Cl₂) to produce sodium chloride (NaCl). This is illustrated below:

2Na + Cl₂ —> 2NaCl

Next, we shall determine the mass of Na that reacted and the mass of NaCl produced from the balanced equation. This can be obtained as follow:

Molar mass of Na = 23 g/mol

Mass of Na from the balanced equation = 2 × 23 = 46 d

Molar mass of NaCl = 23 + 35.5

= 58.5 g/mol

Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g

SUMMARY:

From the balanced equation above,

46 g of Na reacted to produce 117 g of NaCl.

Finally, we shall determine the mass of NaCl produced by the reaction of 100 g of Na. This can be obtained as follow:

From the balanced equation above,

46 g of Na reacted to produce 117 g of NaCl.

Therefore, 100 g of Na will react to produce = (100 × 117)/46 = 254.35 g of NaCl.

Thus, 254.35 g of NaCl were obtained from the reaction.

Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

The empirical formula for perfluoropropane is C3F8.

What is empirical formula?

A compound's empirical formula provides the simplest ratio of the number of various atoms present, but a molecule's molecular formula provides the precise number of each different element that is present.

The number of moles of carbon and fluorine is calculated from their respective molar masses:

Number of moles of the element= (Mass of the element)/ (Molar mass of the element)

The molar mass or the atomic mass of C is known to be 12.0107  g/mol

Thereby, the number of moles of C = (19 g) / (12.0107 g/mol)

= 1.5819 moles

The molar mass or atomic mass of F is known to be 18.998403 g/mol

The no. of moles of F = (81 g) / (18.998403 g/mol)

= 4.2635 moles

In the next step, divide the number of moles of elements that are obtained by the least number of the mole. In this case, the least number of moles is of carbon element.

Thereby, the corresponding calculation is as follows:

Simplest mole ratio of C= (1.5819 moles) /(1.5819 moles)

= 1

Simplest mole ratio of F= (4.2635 moles) /(1.5819 moles)

= 2.69

Therefore, the formula for the compound becomes CF₂.₆₉. But the formula is still not in the simplest whole-number ratio. Hence, to obtain the simplest whole-number ratio, both the subscripts can be multiplied by 3 as follows:

C1X3F2.69X3

= C3F8.07

=C3F8

Hence, the empirical formula of perfluoropropane is C3F8.

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Dependent variables could be height, number of leaves, biomass, etc. The constants could be the amount of water fed to the plants and other environmental conditions apart from the temperature.

Experimental variables could be independent, dependent, or constant.

Independent variables are supplied by the researcher and are often varied or manipulated to produce different effects on experimental systems or subjects.

Dependent variables are measured. Their values are often affected by whatever independent variable the researcher supplies.

Constant variables are uniform throughout the experimental groups or subjects.

Thus, in this case, the aim is to test the effect of temperature on the growth of a plant. The independent variable is the different temperatures.

The dependent variable would be any feature of the experimental plants that indicate growth. It could the height, the number of leaves, etc.

The constant variable would be other conditions the experimental plants are subjected to.

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The chemist should observe the formation of solid copper metal, a change in color of the solution, and the disappearance of the aluminium foil through this unbalanced equation.

The balanced equation for the reaction between copper (II) chloride and aluminum is:

3CuCl2 + 2Al → 2AlCl3 + 3Cu

In this reaction, aluminum replaces copper in the copper chloride solution to form aluminium chloride and copper metal.

The likely observations when the reaction stops are:

1. The solution may change color, indicating that a chemical reaction has occurred. Copper (II) chloride is blue, while aluminum chloride is colorless.

2. Solid copper metal may form and settle at the bottom of the container, indicating that a precipitation reaction has occurred.

3. The aluminum foil may appear to have dissolved or disintegrated, as it has been consumed in the reaction.

4. The reaction mixture may become warmer due to the exothermic nature of the reaction.

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Answer:

we need to see the diagram

Explanation:

Answer: Carbon Dioxide, Methane, Nitrous Oxide and Fuorinated Gases

Explanation:Carbon dioxide (CO2): Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement). Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.

Methane (CH4): Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.

Nitrous oxide (N2O): Nitrous oxide is emitted during agricultural and industrial activities, combustion of fossil fuels and solid waste, as well as during treatment of wastewater.

Fluorinated gases: Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes. Fluorinated gases are sometimes used as substitutes for stratospheric ozone-depleting substances (e.g., chlorofluorocarbons, hydrochlorofluorocarbons, and halons). These gases are typically emitted in smaller quantities, but because they are potent greenhouse gases, they are sometimes referred to as High Global Warming Potential gases ("High GWP gases").