P = a/m-x
x = 8 correct to 1 significant figure
a = 4.6 correct to 2 significant figures
m = 20 correct to the nearest 10

Calculate the lower bound of P.
Show your working clearly.

This last electron is called the differentiate electron because it distinguishes an atom from the one straight away preceding it in the periodic table.

Evaluate an electron configuration, and divide the periodic table into sections to act for the atomic orbitals, the regions where electrons are held. Groups one and two are the s-block, three through 12 represent the d-block, 13 to 18 are the p-block, and the two rows in the middle are the f-block. The electron configuration of an atom is written with the help of subshell labels. These labels contain the shell integer (given by the principal quantum number), the subshell name (given by the azimuthal quantum number), and the total number of electrons in the subshell in superscript.

So we can conclude that Electron configurations are the synopsis of where the electrons are around a nucleus. As we learned earlier, each neutral atom has a number of electrons

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Answer:   The final stage of the life cycle of a tree is when it has fully grown and reached the ... You should be confident in your supplier's approach to sustainability. ... This is the first occasion you will see a stem and perhaps a couple of leaves. ... The next phase is the sapling stage, this is when the sprout continues to grow and has ...

Explanation:

The carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy is 63.4 hours.

To determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy, we can use Fick's second law of diffusion:

\(DC_{surface} / 2 = (C_{surface} - C_{4mm}) / erf(x / (2 * \sqrt{Dt} ))\\\)

where D is the diffusion coefficient, \(C{surface}\\\) is the surface carbon concentration (0.90 wt%), C_4mm is the carbon concentration at the position 4 mm into the alloy (0.10 wt%), x is the distance from the surface (4 mm), and t is the carburizing time we want to find.

We can use the diffusion coefficient for γ-Fe at 1100°C from Table 5.2, which is D = \(6.0 * 10^{-12} m^2/s.\)

Substituting the given values, we get:

\((6.0 * 10^{-12} m^2/s) * (0.90 - 0.30) / 2 = (0.90 - 0.10) / erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s} ))\)

Simplifying the left-hand side, we get:

\(1.8 * 10^{-12} m^2/s = (0.80) / erf(4 mm / (2 * \sqrt{(6.0 * 10^{-12} m^2/s) * t)})))\)

Taking the inverse error function of both sides, we get:

\(erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s) * t)} ) = 0.000346\)

Substituting this back into the previous equation, we get:

\(1.8 * 10^{-12} m^2/s = (0.80) / 0.000346\)

Solving for t, we get:

t = 63.4 hours

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The difference between the molecular orbital (MO) theory and the valence bond (VB) theory is MO theory considers the formation of molecular orbitals by linear combination of atomic orbitals, while VB theory focuses on localized bonding due to the overlap of atomic orbitals, highlighting the geometrical arrangement of bonds in molecules

Molecular orbital theory is a method that describes the electronic structure of molecules by combining atomic orbitals to form molecular orbitals, which are delocalized over the entire molecule. This theory focuses on the formation of new orbitals from atomic orbitals and gives insight into the distribution of electron density, bond order, and magnetism of the molecule.

On the other hand, valence bond theory is based on the idea that atomic orbitals of individual atoms overlap to form bonds between the atoms, this theory emphasizes the localized nature of bonding, where electrons are shared between two specific atoms. It explains the bonding in terms of hybridization of atomic orbitals and their orientation in space.

In summary, MO theory considers the formation of molecular orbitals by linear combination of atomic orbitals, providing a more global view of bonding, while VB theory focuses on localized bonding due to the overlap of atomic orbitals, highlighting the geometrical arrangement of bonds in molecules. Both theories are essential for understanding the electronic structure and properties of molecules.

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Answer:

a

Explanation:

it is a because the soil drives in the cold of January

The concentration of the resulting hydrochloric acid solution is approximately 0.0303 moles/L, or 0.0303 M.

To find the concentration of the resulting hydrochloric acid (HCl) solution, we need to determine the number of moles of HCl and divide it by the volume of the solution.

First, let's calculate the number of moles of hydrogen gas (H2) using the ideal gas law:

PV = nRT

P = pressure at STP = 1 atm

V = volume of H2 gas = 185.0 mL = 0.185 L

n = number of moles

R = ideal gas constant = 0.0821 L·atm/(mol·K)

T = temperature at STP = 273.15 K

n(H2) = (P * V) / (R * T)

= (1 * 0.185) / (0.0821 * 273.15)

≈ 0.00711 moles

Since the reaction between H2 and Cl2 is stoichiometric, the number of moles of HCl formed is the same as the number of moles of H2 used.

Now, let's calculate the concentration of HCl in the resulting aqueous solution:

Concentration = moles of solute / volume of solution

Moles of solute (HCl) = moles of H2 = 0.00711 moles

Volume of solution = 235.0 mL = 0.235 L

Concentration = 0.00711 moles / 0.235 L

≈ 0.0303 moles/L

Therefore, the concentration of the resulting hydrochloric acid solution is approximately 0.0303 moles/L, or 0.0303 M.

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Answer:

26800000000 ns(p). is it ok and mark brainlist

Answer:

7.8

Explanation:

pH + pOH = 14

pOH = 14 - 6.2

= 7.8

How much energy is required to raise the temperature of 3 kg of aluminum from 18°C to 23°C? Use the table below and this equation: Q=mcΔT

Answer:

Radiation

Conduction

Convection

Explanation:

Radiation: Transfer of heat by electromagnetic rays (Example: A microwave heating food)

Conduction: Transfer of heat energy from one object to another through direct contact (Example: Getting out of bed and your warm feet touch cold tile, making the tile warm and your feet cold)

Convection: Movement of heat by a fluid such as air or water (Example: A convectional oven works by heating the air inside the oven to evenly cook food)

Hope this helps!

When a small amount of HCl is added to a solution containing fluoride ions (F−) and hydrogen fluoride (HF), the following change will occur:

c. The concentration of hydrogen fluoride will decrease and the concentration of fluoride ions will increase.

This is because the HCl will react with the HF to form H
3
O
+
and F
−
, according to the following equation:

HCl + HF → H
3
O
+
+ F
−

This reaction is an example of an acid-base reaction, where HCl acts as the acid and HF acts as the base. The result is that the concentration of HF will decrease, since it is being used up in the reaction, while the concentration of F−
will increase, since it is being produced.

Fluoride ions are negatively charged atoms of the element fluorine (F), which have gained one electron to achieve a stable electron configuration. Fluoride ions are highly reactive and are found in many minerals, as well as in seawater and some freshwater sources.

Fluoride ions are widely used in dental products such as toothpaste, mouthwash, and professional fluoride treatments because they can help prevent tooth decay. Fluoride ions work by strengthening tooth enamel, which is the hard outer layer of the teeth that protects against decay.

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Answer:

C + 2H2 ⇒ CH4

Explanation:

In order to balance a chemical equation you need to make sure that the number of atoms on both sides are equal

C + H2 = CH4

C = 1

H = 2

Products:

C = 1

H = 4

H2 = 2 × 2 = 4

C + 2H2 ⇒ CH4

Hope this helps.

Answer:

Plastilina inteligente. Cambia de color en función de la temperatura ambiental. ...

Plastilina vegetal. ...

Plastilina para bebés. ...

Plastilina mágica. ...

Plastilina sin gluten. ...

Plastilina gris. ...

Plastilina magnética. ...

Plastilina Slime.

Explanation:

Dish of Cabbage, carrot, pea, cauliflower and brinjal are the meals we could enjoy that contain only plant products.

Cabbage, carrot, pea, cauliflower and brinjal are the five different plants based meals. In these meals, vegetables are used which are the parts of plant. We know that vegetables are very healthy and nutritive which can be get from plants.

So we can conclude that dish of Cabbage, carrot, pea, cauliflower and brinjal are the meals we could enjoy that contain only plant products.

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Answer:

nucleotides

Explanation:

The four types of nitrogen bases found in nucleotides are: adenine (A), thymine (T), guanine (G) and cytosine (C). The order, or sequence, of these bases determines what biological instructions are contained in a strand of DNA. ... DNA is made of chemical building blocks called nucleotides.

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Radiation is the emission and propagation of energy in the form of waves, rays, or particles. There are three main types of radiation Non-ionizing radiation , Ionizing radiation, and Neutrons.

Non-ionizing radiation is the release of energy from the lower-energy region of the electromagnetic spectrum. Ionizing radiation is radiation with sufficient energy to remove an electron from an atomic orbital, forming an ion. Neutrons are particles found in the atomic nucleus.

Radiation includes the emanation of any portion of the electromagnetic spectrum, plus it includes the release of particles. An example is a burning candle that emits radiation in the form of heat and light. Radiation is the release of energy, whether it takes the form of waves or particles. Radioactivity refers to the decay or splitting of an atomic nucleus. A radioactive material releases radiation when it decays.

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Answer:

1a) .68 moles 1b)4.1E-23 molecules.

2a) .37 moles 2b) 2.27E-23 molecules

Explanation:

1a) CO2 is equal to 44 grams (C→12 grams,O→16 grams[·2]) .30g/44g is .68 moles.

1b) multiply 1A by advogadros number (6.022E-23)

2a) NaCl is 58 grams. 22/58 is .37 moles.

2b) multiply 2A by advogadros number.

you'd answer #3 the same way #1 and #2

The branch of science that deals with chemicals and bonds are called chemistry. The moles are units to calculate the quantity required to use the element.

The correct answer is mentioned below.

According to the question, the moles to the option is as follows:-

\(n =\frac{M}{M.M}\\ \\\frac{30}{44} \\\\=0.681\\\\\)

The number of molecules is \(0.68 *6022*10^{23} =4.09496*10^{23\).

2. moles of 22 grams of NaCl is

\(\frac{22}{44}\\ \\=0.5\\\\\)

Molecules will be \(0.5*6.022*10^{23} = 3.011*10^{23}\)

3. moles of 50-gram ammonia

\(\frac{50}{17} \\\\2.94\\\)

The number of molecules is \(2.94*6.022*10^{23} = 1770*10^{23\)

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Answer:

See explanation

Explanation:

The compound P2Br2 contains a pi bond and a sigma bond between two phosphorus atom and then one sigma bond to each of the bromine atoms, hence satisfying the octet of each atom. This compound is covalent in nature since it is composed of two nonmetals.

However, Ba2Br4 involves barium which is a pure metal. Barium mostly forms ionic compounds in which its valency is two. Covalent bonds between two barium atoms is not possible hence the compound Ba2Br4 does not exist.

The safety symbols which would be on an agar plate of bacteria culture are BSL1 or BSL2.

This is referred to as a method in which microbial organisms are multiplied by letting them reproduce in a predetermined culture medium such as nutrient agar etc under standard laboratory conditions based on the parameters involved.

BSL1 or BSL2 are both referred to as biosafety levels and they are known as set of established standards which must be followed in the safe handling of biological material which is therefore the reason why it was chosen as the correct choice.

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Amino acid threonine is classified as polar neutral amino acid. This amino acid is polar due to the hydroxyl group attached to its side chain.

Both the one-letter acronym T and the three-letter abbreviation Thr are used to refer to threonine. Because it cannot be synthesised by the human body, essential amino acids must be obtained from diet or supplements. A polar neutral amino acid is threonine. This amino acid is polar because of the hydroxyl group on the side chain, but it lacks an acid or amine group that may be charged. Neutral polar amino acids are neither basic nor acidic, as their name implies. This indicates that they have precisely one amino group and one carboxyl group in their side chains (hence the name "amino acid"). In reality, the bulk of amino acids—polar and non-polar—are neutral.

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Answer:

65.8 miles

Explanation:

The matter cannot be created or destroyed in a chemical reaction. So that answer is No

According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction. The total mass of the reactants must be equal to the total mass of the products, meaning that atoms are rearranged and combined in different ways, but no atoms are lost or gained.

The law of conservation of mass is a fundamental principle in chemistry, and it highlights the notion that matter is conserved throughout chemical reactions. This understanding allows chemists to accurately predict and balance chemical equations, ensuring that the total number of atoms on each side of the reaction remains constant.

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Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.

GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)

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Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.

Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.

Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.

Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.

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Side products produced in the dehydration of cyclohexanol to cyclohexene would be ethers

Alcohols to alkene

       C6H11OH with conc H2SO4 gives C6H10 + H2O

What is E1 mechanism?

Dehydration reaction involves 3 steps:

Even weakly basic substances such as water, can deprotonate a carbocation to create an alkene.

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Antibodies against nicotinic acetylcholine receptors (nAChR), present at neuromuscular junction (NMJ), can affect function of junction by interfering with normal signaling between nerve and muscle.

Antibodies against nicotinic acetylcholine receptors (nAChR), which are present at neuromuscular junction (NMJ), can affect the function of junction by interfering with normal signaling between nerve and muscle.

At NMJ, the nerve terminal releases acetylcholine (ACh), which binds to nAChR on muscle cell membrane, leading to depolarization of muscle cell and muscle contraction. If antibodies bind to nAChR, they can block or reduce the number of available receptors for ACh, leading to decrease or even complete loss of the normal muscle response to nerve stimulation.

This can result in muscle weakness, fatigue, and even paralysis, depending on the severity of antibody binding and amount of functional nAChR remaining at the NMJ.

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Answer:

1.water  2. air 3.aluminum  4.steel 5.iron  6.silver 7.gold

Explanation:

The density of iron is = 7.86 g/mL

The density of gold is  = 19.3 g/mL

The density of steel  is = 7.8 g/mL

The density of water is  = 1.00 g/mL

The density of air  is = 1.29 g/mL

The density of silver is = 10.5 g/mL

The density of aluminium is  = 2.70 g/mL

so..

water < air < aluminum < steel < iron < silver < gold

Answer:

Table salt is considered to be a compound because it is made up of two elements (sodium and chloride,) while sodium itself is a raw element. That's why table salt is considered to be a compound, while sodium is not.

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Answer: here is my explination hope this is relavent. and helps to your question. i love chemistry

Answer:

If each side of the equation has the same number of atoms of a given element, that element is balanced. If all elements are balanced, the equation is balanced.