3) Identify the noble gas in the following list A) helium B) nitrogen C) oxygen D) gold E) chlorine 4
) The atomic number of an atom is equal to the number of A) nuclei B) neutrons C) neutrons plus protons D) electrons plus protons E) protons
5) Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the elementis A) 30 B) 32 C) 34 D) 64 E) 94
6) How many proton are in an isotope of sodium with a mass number of 25% B) 14 C) IS D) 25 E) 32 Isotopes are stoms of the

Hence, the statement A carbon radical is trigonal planar and A carbon radical is sp2 hybridized correctly describe the structural characteristics of radicals. Therefore, the correct option is Correct Answer.

Radicals are molecular species with unpaired electrons. The radical species' unpaired electrons tend to have unique electronic properties, making them quite reactive. In general, radical species tend to react in a very selective and controlled manner, making them important intermediates in various chemical transformations.

In the case of organic compounds, the radicals are most commonly formed by homolytic cleavage of covalent bonds.

The following are the structural characteristics of radicals:

Radical species' electronic structure includes an odd electron that resides in an orbital that is not occupied by another electron. This electron is called an unpaired electron. A carbon radical is sp2 hybridized. A carbon radical is trigonal planar and has a shape that is similar to that of a carbocation or a carbanion.

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Calculate [OH-] and pH with [H+] = 2.9 × 10^-10 M:

Using the equation Kw = [H+][OH-], where Kw is the ion product of water:

Kw = [H+][OH-]

1.0 × 10^-14 = (2.9 × 10^-10)[OH-]

[OH-] = (1.0 × 10^-14) / (2.9 × 10^-10)

[OH-] ≈ 3.45 × 10^-5 M

To calculate the pH, we can use the equation:

pH = -log[H+]

pH = -log(2.9 × 10^-10)

pH ≈ 9.54

THEREFORE, the [OH-] is approximately 3.45 × 10^-5 M, and the pH is approximately 9.54.

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Answer:

It's the elements atomic mass and the number of neutrons and protons in an atom.

Explanation:

When we have an ionic compound, we have elements with different charges, cations are known for the + charges being carried by them, in this group of elements we found the metals. Within this group of elements, we have monovalent cations (Cs+ for example), divalent cations (Ca2+), but in the transition metals we find multivalent or polyvalent ions, like Fe, that can be Fe2+, Fe3+, and Fe4+, so these elements are able to carry different charges as cations, more examples of these multivalent ions are Copper, Zinc, Manganese, and many more.

Answer:

d) protons in its nucleus

Explanation:

-

This is a perfect answer

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Calculate the number of moles of chlorine that combined with one mole of lead in ..... The molar volume of a gas at STP, VSTP , is equal to the ... The temperature of the water was 26.3°C and the air pressure of the room ..... 23.7 g Na2S2O3.

the temperature of the water was 26.3 and the air pressure of the room

.....23.7 g Na2S2O3

Explanation:

Answer:

No mass loss

Explanation:

The mass of ice and the water in the different state are equal because the same of quantity of matter is present in both state of matter of matter.

70 grams of NaCl (salt) were discovered by the police in the room. There is sufficient salt to demonstrate that Albert used acid to kill the butler.

From the given reaction we have as:

HCl + NaOH → NaCl + H2O

Here by comparing the moles of reactants and products we have 1 mole of HCl reacting with 1 mole of NaOH to give 1 mole of NaCl and H2O.

So, we can say that  the mole ratio of NaOH: NaCl: HCl = 1 : 1 : 1

The molecular weight of HCl is 37g

The molecular weight of NaOH is 40g

The molecular weight of NaCl is 59g

In 70g of NaCl there are = 70 / 59 = 1.186 moles of NaCl

If we consider 60g of HCl there are = 60/37 = 1.62 moles of HCl

Here we can see that NaCl acts as limiting reagent and only 1.18 moles of HCl reacts with NaOH.

So, to find the mass of 1.18 moles of HCl = 1.18 x 37 = 43.66g

So, the required amount of HCl to kill the butler is 43.66g. So, there is  enough salt to prove that Albert killed the butler with acid.

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Answer:

1. (put in simpler words so no one knows you got it off of brainly)

The electricity that flows to our homes is generated in power stations. From here, it flows through large transmission lines, which carry it to substations. Finally, distribution lines carry electricity from substations to houses, businesses, and schools.

2.  (put in simpler words so no one knows you got it off of brainly)

The transmission over long distances creates power losses. The major part of the energy losses comes from Joule effect in transformers and power lines. The energy is lost as heat in the conductors. This can be minimized by

answer choice 1: reducing technical losses including: replacing incorrectly sized transformers, improving the connection quality of conductors (power lines), and increasing the availability of reactive power by installing capacitor banks along transmission lines.

answer choice 2: (just in case answer choice 1 isn't what you're looking for)

You can reduce losses in your home by spreading out your electricity use evenly throughout the day, instead of running all your appliances at once.

Explanation:

hope this helped <3

Answer:

calcium is the correct answer :)

Answer:

The pressure of gas will increase.

Explanation:

The question above is related to "Boyle's Law." According to this law, provided that the temperature and amount of gas are stable, the absolute pressure of gas is inversely proportional to its volume.

In this sense, if the plunger will be pushed in, the volume of the gas will definitely decrease due to lack of space while the pressure will increase because the molecules of the gas are colliding with each other. The greater the collision, the greater the pressure. This explains the answer above.

The d-orbital starts in the third energy level (n = 3) of an atom.

Each energy level can contain one or more sublevels, including s, p, d, and f sublevels. The first energy level (n = 1) has one s orbital and can hold a maximum of 2 electrons. The second energy level (n = 2) has one s orbital and three p orbitals, allowing for a maximum of 8 electrons. The third energy level (n = 3) has one s orbital, three p orbitals, and five d orbitals, accommodating a maximum of 18 electrons.

The d-orbitals are found in the third energy level, corresponding to the third period of the periodic table. Therefore, the period number for the energy level where the d-orbital starts is 3.

The filling order of orbitals follows the pattern: 1s, 2s, 2p, 3s, 3p, 4s, 3d, and so on. The d-orbitals start filling after the p-orbitals in the third energy level. The electron configuration for the third energy level is written as 3s^2 3p^6 3d^1-10, depending on the element.

For example, the electron configuration of iron (Fe) is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2. This configuration indicates that the d-orbitals of iron are half-filled with 5 electrons.

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1.00 pint of milk is equal to 473.18 milliliters, based on the conversion factor of 1 pint = 473.18 milliliters.

To convert pints to milliliters, we can use the conversion factor of 1 pint = 473.18 milliliters.

Since we have 1.00 pints of milk, we can multiply it by the conversion factor to find the volume in milliliters:

1.00 pint * 473.18 milliliters/pint = 473.18 milliliters.

Therefore, 1.00 pint of milk is equivalent to 473.18 milliliters. It's important to note that this conversion factor is based on the standard definition of a pint, which is equal to 473.18 milliliters. In some countries, the pint may have a different value, so it's essential to use the appropriate conversion factor based on the specific context or region.

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One of the two OH groups in chromic acid is deprotonated to produce chromate (CrO42-), a monovalent inorganic anion.

Chromate is created when an oxygen atom and four chromium atoms combine. It is a chromic acid conjugate. The elimination of two protons from chromic acid results in the formation of chromate, a chromium oxoanion.

Contrary to dichromate, which contains two tetrahedral units with one common oxygen and a CrOCr bond angle of 126°, chromate (CrO42) has a tetrahedral form.

They are mildly potent oxidising agents and chromium oxyanions in the +6 oxidation state. Chromate and dichromate ions may be interconvertible in an aqueous solution.

Chromium and oxygen make up the chemical compound known as chromate. Chromium is a transition metal that is hard, brittle, glossy, and steely-gray in color. It has an atomic number of 24, and the symbol for it is Cr.

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Answer:

0.629 atm

Explanation:

P1V1 = P2V2

P1 = 0.986 atm

V1 = 10.2 L

P2 = ?

V2 = 16.0 L

Solve for P2 --> P2 = P1V1/V2

P2 = (0.986 atm)(10.2 L) / (16.0 L) = 0.629 atm

Answer:

cosmetics factory

Explanation:

The company owned by Hsaio has been most likely to be the cosmetic factory. Hence, option B is correct.

A cosmetic manufacturer is a company that manufactures cosmetic items. The products manufactured by the cosmetic industry include soap, shampoo, and toothpaste that smell good, such as perfume and deodorant.

The cosmetic industry products are formed to be viscous in nature, in order to be applied with ease in personal care. Calcium chloride has been the chemical agent that has been mediating to add viscosity to cosmetic products.

Since, Hsaio has been incorporating most of the budget of his company over calcium chloride, a product used in the cosmetic industry. Thereby he is most likely to own a cosmetic factory. Hence, option B is correct.

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The probability of a positive test result given a disease is Pr{P∣D} = 0.92. The correct option is A.

Let D = disease,

DC = no disease,

P = positive test result,

and PC = negative test result.

So, we need to find out Pr{P∣D}.

Bayes' theorem formula:

Pr{D∣P} = (Pr{P∣D} × Pr{D})/ Pr{P}... (1)

We know that,

Pr{D} = 0.10Pr{DC}

= 0.90

From the information given, it is evident that the person has the disease, and the test results are positive, so Pr{P|D} is given as 0.92.

P{P} = (Pr{P∣D} × Pr{D}) + (Pr{P∣DC} × Pr{DC})

Here, we are interested in the probability of having the disease given that the test result is positive.

Substituting the values in Bayes' theorem, we have

Pr{D∣P} = (0.92 × 0.10)/ P{P}... (2)

By total probability, P{P} is obtained as:

P{P} = (Pr{P∣D} × Pr{D}) + (Pr{P∣DC} × Pr{DC})

= (0.92 × 0.10) + (0.06 × 0.90)

= 0.0984+ 0.054

= 0.1524

Now, substituting the values of Pr{D}, Pr{P∣D} and P{P} in Eq. (1), we get:

Pr{D∣P} = (0.92 × 0.10)/ P{P}

= 0.0092/ 0.1524

= 0.0603

= 0.06

Hence, Option A is correct.

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The mass percent composition of nitrogen in acetaminophen is 9.26 %.

The mass percent composition of an element is the percentage of the ratio of the molar mass of that element to the molar mass of the entire compound. Acetaminophen represented as C8H9NO2 is a drug that is used as a pain reliever.

First, we will calculate the molar mass of this compound. For this, we should know the mass of each element present in the compound.

mass of C = 12, mass of H = 1, mas of N = 14, mass of  O = 16.

Now, we will calculate the molar mass of acetaminophen

= 12*8+ 1*9+14*1+16*2

=  151 g

Now, we have to calculate the mass percent composition of Nitrogen.

The molar mass of nitrogen = 14g

The molar mass of the entire compound =  151 grams.

Mass percent composition of N =  (mm of N ÷ mm of C8H9NO2) ×100

=  (14/151) × 100 =  0.0926 × 100

= 9.26 %

Therefore, the mass percent composition of nitrogen in acetaminophen (C8H9N02) is 9.26%.

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Answer:

Refer to explanation

Explanation:

Weather is the main cause behind most short term environmental changes

For example, a period of heavy rain may lead to a pond overflowing, and flooding the nearby shrubbery

Animals in the area would adapt to this by trying to keep away from the flooded area until it dries out, once the rain ends

If one isotope of iron has an atomic number of 26, then there are 26 protons in its nucleus.

The element iron has an atomic number of 26, which means that it has 26 protons in its nucleus. The number of protons in an atom is what defines its identity as a particular element. In a neutral atom, the number of protons is equal to the number of electrons in the atom's electron shells, which balances out the positive charge of the protons.

Iron has several isotopes, which are atoms of the same element that have different numbers of neutrons in their nuclei. The most common isotope of iron, with a relative abundance of about 92%, is iron-56, which has 26 protons and 30 neutrons in its nucleus. Other isotopes of iron include iron-54, iron-57, iron-58, and several radioactive isotopes.

All atoms of a given element have the same atomic number, which is equal to the number of protons in the nucleus of the atom. Therefore, if one isotope of iron has an atomic number of 26, then there are 26 protons in its nucleus.

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Answer:

B) Cu(S)

Explanation:

Copper is the best conductor of electricity.

Mercury is a convenient liquid to use in a barometer because of its high density and low vapor pressure.

Mercury is commonly used in barometers due to its unique properties that make it suitable for this purpose. Firstly, mercury has a high density, which means it is much denser than most other liquids. This property allows the mercury column in the barometer to be relatively short, making the instrument more compact and easier to handle.

Secondly, mercury has a low vapor pressure at room temperature. Vapor pressure refers to the tendency of a substance to evaporate into a gas. In the case of a barometer, it is important that the liquid in the column does not readily evaporate, as it would affect the accuracy of the pressure measurement. Mercury's low vapor pressure ensures that the liquid remains in its liquid state and does not significantly evaporate over time, providing stable and reliable measurements.

Additionally, mercury is highly sensitive to changes in atmospheric pressure, making it an effective medium for measuring and indicating variations in air pressure. The height of the mercury column in the barometer corresponds to the atmospheric pressure, allowing meteorologists and scientists to track changes in weather patterns and make accurate pressure measurements.

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About 4/5.

Hope this helps.

Answer:  c

Explanation:

The concentration of NO remaining when exactly one-half of the original amount of H₂ had been consumed is 0.0050 M.

Equation of reaction: 2 NO + 2 H₂ ---> N₂ + 2 H₂O

Experiment 2 data:

Initial concentration of NO = 0.006 M,

Initial concentration of H₂ = 0.002 M,

Initial rate = 3.6 * 10⁻⁴ L/(mol s)

From the equation of the reaction, 2 moles of NO reacts with 2 moles of H₂  to form the products.

The mole ratio of NO and H₂ is 1 : 1

One-half of the original amount of H₂ will 0.5 * 0.002 M = 0.001 M

Half of the original amount of H₂ has reacted with an equal amount of NO.

Hence, the amount of NO reacted = 0.001 M

The concentration of NO remaining = 0.0060 - 0.0010

The concentration of NO remaining = 0.0050 M

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One of the flaws of this solution is that because it is programmed at night data loss is possible if a failure occurs at this time.

This is used to save important information or date from a device such as a computer periodically.

Tape cardridge backup is the best option if a lot of data has to be saved because they are efficient and low cost.

The only problem is that because the back up is automatically programmed at night, a failure such as a problem in electricity implies valuable data might be lost.

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