chemicals that accumulate in soil and water as a result of car emissions, improperly disposed waste, industry, and agriculture are known as

Answer:

Explanation:

[He]2s²2p⁶

Given that boron has an atomic mass of 10.81 amu, which is closer to 11 than 10, boron-11 is more common. This indicates that boron-11 is more prevalent.

The quantity of protons and neutrons in a specific element's nucleus is known as the atomic mass. This number of electrons in an object's nucleus is often indicated by its atomic number. It is an element's typical weight. The mass of the neutrons and protons can be added to determine the isotopes of an atom in an element.

The term "atomic mass" refers to the weight of a molecule or atom. To determine the average weight of elements and macromolecules as well as to resolve stoichiometry issues, the number of protons is used.

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For the necessary concentration, 500 ml distilled water must be added here.

You can consume distilled water, of course. Because it is flatter and less flavored as tap and bottled waters, you might not enjoy the taste. Businesses boil water, collect the steam, and then condense the liquid back to liquid to create distilled water. Minerals and pollutants are taken out of the water by this method.

Briefing:

Molarity= Volume /Moles​

Moles of HCl present =100×10 −3 ×3=0.3

Required molarity =0.5

∴0.5= Volume /0.3

​∴Volume=0.6 L=600 mL

Here, 600 mL total, 100 mL at the beginning

For the necessary concentration, 500 ml distilled water must be added here.

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Answer:

Electronic configuration An element's atomic number tells you the number of protons in the nucleus. The number of protons in an atom is equal to the number of electrons. In the first shell of an atom there are 2 electrons. In the third shell there are 18 electrons.

the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water. is 0.00840 moles

The calculation of the mole fraction is as follow:

As we know that

Molar mass = Number of grams ÷ number of moles

Or

number of moles = Number of grams ÷ molar mass

from the question

Number of moles of CaI2 = 0.400

And, Molar mass of water = 18.0 g/mol

Now we can calculate  the  moles of water is

= 850.0 g ÷ 18.0 g/mol

= 47.22 mol

And, Total number of moles is

= 0.400 + 47.22

= 47.62

So, Mole fraction of CaI2 is

= 0.400 ÷ 47.62

= 0.00840 mole

hence, the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water. is 0.00840 moles

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Temperature remains the same as the amount of heat and the concentration remains the same..

When 100cm3 of 1.0 mol dm-3 hcl is mixed with 100 cm3 of 1.0 mol dm-3 of NaOH the temperature remains the same. Here, the volume of the solution gets half .mass and heat released reduced by half.so, temperature remains the same as the concentration of the solution does not change.concentration of the solution is the amount of solute present in the given solution.

So, the temperature remains the same as 5C.We know this from calculating heat exchange using specific heat capacities.This process explains when two or more substances at different temperature are brought together to the environment they eventually reach the same temperature.

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The pressure of the flask under these final conditions is 13 atm .

What are moles ?

The current SI definition of moles and the "new SI" draft definition will be reviewed. Current textbook treatments of moles are compared to these official definitions. From a historical perspective, in 1971 he reviews the treatment of moles and material quantities in textbooks before and after the introduction of these quantities in SI. Textbook definitions do not always match official definitions, but reflect common usage by chemists. This is because when the new SI is adopted, the textbook definition will likely be closer to the official definition, and the draft definition more closely matches what is found in many textbooks than the current official definition. However, SI-based quantities of substances are likely to continue to cause problems for chemistry teachers and, if retained, are largely ignored by chemistry practitioners.

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When using lithium-based batteries In order to enable optimal recharging, store the batteries in a fridge.

As long as there are no flaws as well as the cells are not damaged, lithium batteries are type of ethical and unlikely to malfunction. Lithium batteries may pose a fire and/or detonation risk if they are damaged or unable to function safely.

For reliable and high-power use, lithium-ion and battery packs are both appropriate. But compared to battery packs, battery packs are more effective and common. This is so that they may be used in large quantities due to their higher power levels.

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the concentration of lithium hydroxide in molarity was 8M

what are the properties of lithium hydroxide?

A transparent to water-white liquid with a possible strong odour is what lithium hydroxide solution looks like. Skin, eyes, and mucous membranes may have very irritating contact reactions. Through consumption, inhalation, or skin absorption, it may be harmful. Other compounds are created using it.

Given,

weight =48 g

No. of moles  =2448=2 moles

volume =250mL

Molarity Volume (in L)No. of moles=0.25L2=8M

=8M

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The statements that best describe Bridget's recorded observations are:

1 A television is a device that converts electrical energy into heat and light energy.

2 Electrical energy may be converted into other types of energy.

3 Sound energy is created by combining heat and light energy.

4 Electrical energy may be converted into motion energy.

Energy transfer is the process of transferring energy from one system to another, such as by heat, work, or mass transfer.

Energy is required for living organisms to grow, breathe, reproduce, and move. Because energy cannot be created from a vacuum or a void, it must be transported via the biosphere. The sun is the principal source of energy for practically every ecosystem on Earth.

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Full Question:

Bridget performed an investigation to determine if a television set transformed electrical energy into other types of energy. She recorded her observations in a table. What statement best describes the results?

Question Observation

Does it transform into heat energy?

Does it transform into light energy?

Does it transform into sound energy?

Does it transform into energy of motion?

There are [tex]1.77 * 10^{24}[/tex] atoms of sulfur in 60.0 g of aluminum sulfide.

How do you calculate the number of atoms in a gram?

What is the purpose of aluminum sulfide?

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josh has 10 g of element a and 10 g or element b. when finished with the experiment, josh has 20 g of element a and b combined. This demonstrates ' Law of conservation of mass'.

In a closed system, mass cannot be created or destroyed, but it can be changed from one form to another. Thus, mass of a system remains same before and after the reaction.

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The new pressure will be 1.45atm.

Ideal gas equation gave a relation between pressure, temperature and volume. It can be expressed as:

PV=nRT

Where, P is pressure, V is volume and T is temperature

The given data:

[tex]T_{1}[/tex] = 280K

[tex]T_{2}[/tex]= 406K

[tex]P_{1}[/tex] = 1 atm

[tex]P_{2}[/tex] = ?

The amount of unknown pressure can be determined by using the formula:

P1/T1=P2/T2....(i)

Now, put the values of given data in above equation.

P2= P1T2/T1

P2=1×406K / 280

P2 = 1.45atm

Therefore, the new pressure will be 1.45atm

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Carbon Dioxide.

A presumptive test called phenolphthalein reacts with the heme molecule found in blood. Pink is produced when a reaction is favorable. While bloodstains typically have a reddish-brown hue, the color of the substrate or the stain's age can have an impact on how visible or noticeable the stain is.

A technique for separating substances or metal complexes based on their relative solubilities in two different immiscible liquids, typically water (polar) and an organic solvent, is known as liquid-liquid extraction (LLE), also known as solvent extraction and partitioning (non-polar).

Precipitin Test confirmation is required for positive results. The serologist must determine whether a stain is actually blood after a presumptive test suggests it might be blood. A precipititin test can detect proteins that are only present in human blood.

The Ouchterlony test compares the responses of a blood sample to particular antibodies to identify if it is human or animal. A sample of the unidentified bloodstain is put in an agar gel well.

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Because of Emulsion, when we store hand cream for a week its oil and water get separated.

Water and oil are necessary to make hand cream. water is an emulsifying agent.oil and water mixtures are emulsions when shaken together.The oil will form droplets and dispersed throughout the water.In this process,the most necessary is to mix the oil and water properly.The content of the ingredients may have been miscalculated or the temperature of the water is not enough.

Emulsifiers are added to hand cream.This is based on chemicals phospholipids.These are obtained from plants,nuts,berries ,leafs etc.

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Answer:

Argon Gas

Explanation:

:)

Explanation:

for reactions to occur, the reactants must've reach a certain amount of energy for collisions to occur. hence, if a reaction has a lower activation energy, this energy can be reached sooner therefore, reaction would occur faster.

The missing item which would complete this alpha decay reaction is: C. ²⁵³Fm₉₈.

In Science, there are three (3) main types of radioactive decay and these include the following:

An alpha decay can be defined as a type of radioactive decay in which the atomic nucleus of a radioactive element emits an alpha particle, thereby, producing chemical elements that have different atomic nucleus.

During an alpha decay, a radioactive element such as fermium (Fe) with a mass number of 257 would be decreased by four (4) while its atomic number (number of protons) of 100 is decreased by two (2), to produce an isotope and an atom of Helium (⁴He₂), as illustrated in the chemical reaction below:

²⁵⁷Fe₁₀₀  ---->   ²⁵³Fm₉₈ + ⁴He₂

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The answer is 0.0055 grams of glucose (c6h12o6) are in 4.9 moles of glucose

The formula weight is a quantity calculated in chemistry by multiplying each element's atomic weight (measured in atomic mass units) by the number of atoms it has in the formula, and then adding up the results. Sometimes referred to as equation weights, these relative weights computed from the chemical equation. This is how isotropically weighted averages are used to get the molar mass(of glucose) (average molecular weight). This differs from molecular mass, which is the weight of a single molecule made up of distinct isotopes.

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The density of the material would be 1.75 gm/cc.

p = n'∑Ac + ∑AA/VcNA

= n'(∑Ac + ∑AA)/9³NA

=n'(∑Ac + ∑AA)/(2(rA + rX))³ NA

n' = number of atoms per unit cell

= 4(assumption)

rA = 0.137 × 10⁻⁷ cm

rX = 0.241 × 10⁻⁷ cm

NA = Avagadros number

= 6.022 × 10²³

∑Ac = Atomic weight of all cations

∑AA = Atomic weight of all anions

p = n'(∑Ac + ∑∑AA)/(2(rA + rx))³NA

= 4(22.7 + 91.4/(2(0.137 × 10⁻⁷ + 0.241 × 10⁻⁷))³ 6.022× 10²³

= 1.75 gm/cc

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Energy levels are the fixed distances of electrons from the nucleus, sublevel is a level that is lower than another level whereas an orbital is the most likely location of an electron present around an atom.

The sublevels contain carry orbitals. Orbitals are spaces that have a high prospect of containing an electron. An orbital is an area or location where the electrons are present. There can be two electrons in one orbital extreme. Each energy level or shell is divided into many sublevels. Both sublevel and subshell are used interchangeably. The sublevels are constituted by the letters s, p, d, and f. Each energy level has certain sub-levels. Therefore, these circular orbits are called as energy levels or energy shells. The orbits of an atom act for the energy levels of the electrons in it.

So we can conclude that Orbitals and sublevels are both concepts used in chemistry to describe the energy states of electrons.

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NaCl would be the best choice to substitute in the reaction

The transfer of electrons from one reactant to another occurs during an oxidation-reduction (redox) reaction.

Numerous processes that you have already examined, such as single replacement, combustion, and combination, are redox processes. The loss of electrons is called oxidation. Gaining electrons is what reduction is. In the process, electrons are lost and gained simultaneously. For instance, when oxygen and elemental calcium react, calcium oxide is the result.

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The valence electrons and oxidation number and the total no. of dot is given below.:

a) Ca -    2       0      2

b) Ca⁺² -      0    + 2     0

c) Cl             7       0     7

c) Cl⁻            8       -1    8

d) Li               1       0    1

e) Al³⁺            3     +3    0

             Valence electrons      Oxidation number     total number of dots

a) Ca                     2                                   0                                 2

b) Ca⁺²                   0                                  + 2                             0

c) Cl                        7                                   0                                 7

c) Cl⁻                      8                                    -1                                8

d) Li                        1                                      0                               1

e) Al³⁺                     3                                    +3                               0

Thus, the total number of valence electron , oxidation number and the total number of dots is given as:

a) a) Ca -    2       0      2

b) Ca⁺² -      0    + 2     0

c) Cl             7       0     7

c) Cl⁻            8       -1    8

d) Li               1       0    1

e) Al³⁺            3     +3    0

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When two compounds are combined and change into a third substance, this is referred to as a biochemical reaction (or chemical reaction). When two substances are combined, not all of them react chemically.

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that molecules and atoms are ordered, which leads to the formation of new substances with new properties.

Examples for chemicals include the basic building blocks, such as zinc, nitrogen, and oxygen; combinations created from these building blocks, such as water, dioxide, or salt; and more complicated substances, such as the air you breathe, rainfall, a chicken, a car, etc.

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Answer:

Chemistry Secondary School answered Mg (OH)₂ + HCl→ MgCl₂ + H₂O balance it Answer 5.0 /5 6 Diabolical Answer: The answer will be; = Mg (OH)₂ + 2 HCl → MgCl₂ + 2 H₂O That's all. Find Chemistry textbook solutions? Class 12 Class 11 Class 10 Class 9 Class 8 Class 7 Class 6 Preeti Gupta - All In One Chemistry 11 3080 solutions

The main safety hazards of trimethylsilyl chloride (tmscl)  in the lab are,

It could cause severe eye burns.

It is harmful if absorbed through the skin. It could cause severe burns.

It may be harmful if swallowed. Causes severe digestive tract burns.

It may be harmful if inhaled. Causes chemical burns to the respiratory tract.

Prolonged or repeated skin contact may cause dermatitis.

Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.

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Answer:

Afferent or sensory neurons

Explanation:

They collect stimuli received by receptors throughout the body, including the skin, eyes, ears, nose, and tongue as well as pain and other receptors in the internal organs. Sensory information is transmitted to the central nervous system, which includes the brain and spinal cord.

The correct mole ratio of the reaction is 1 mol of carbonate to 2 mol of acid. Option B

We know that the ratio of the reactants that are involved in a reaction is what we call the mole ratio. We have to note that a neutralization reaction is the type of reaction that occurs between an acid and a base. We also have to recall that is vita to be able to write the balanced reaction equation before we can be able to find the mole ratio.

Now, we have the balanced reaction equation as;[tex]CO_{3} ^2-(aq) + 2H^+(aq) ----- > H2O(l) + CO2(g)[/tex]. The reaction is thus a 1:2 reaction for the carbonate and acid.

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The correct answer is A. A pH of 7 say about a solution is The solution is neutral.

A pH of 7 indicates a neutral solution. The pH scale is a logarithmic scale that measures the acidity or alkalinity (basicity) of a solution. A pH value of 7 is considered neutral, which means the concentration of hydrogen ions (H+) is equal to the concentration of hydroxide ions (OH-) in the solution. In other words, the solution is neither acidic nor basic.

Acidic solutions have a higher concentration of hydrogen ions (H+), which makes them more acidic. The lower the pH value, the higher the concentration of H+ ions and the stronger the acid.

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The empirical formula for the hydrocarbon is CH₂O.

First, we assume that we have 100g of formaldehyde

According to the question we have 40.0% of carbon, 6.70% of hydrogen, and 53.3% of oxygen. With help of this, we calculate the moles of individual elements.

Moles of C = 40.0 g of C × 1 mol of C / 12.01 g C = 3.331 mol C

Moles of H = 6.7 g of H × 1 mol of H / 1.008 g H = 6.65 mol H

Moles of O = 53.3 g of O × 1 mol of O / 16.00 g O = 3.331 mol O

To get the molar ratio we divide all the moles by the smallest moles which are 3.331. From here the ratio comes out to be C: H: O = 1:2:1.

Thus the empirical formula is, CH₂O.

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