An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be . If the atom instead gains 4 electrons, the net charge will be

Answer;

= 18.24

Explanation;

The ratio of N and O in the formula NO2 IS 1:2

Mass of nitrogen gas is 0.500 g

Moles of nitrogen will be;

= 0.500/16 = 0.03125 moles

Therefore;

The moles of Oxygen from the ratio will be;

= 0.03125 × 2 = 0.0625 moles

But; 0.0625 moles is equal to 1.140 g of Oxygen

The atomic number (mass in 1 mole) will be;

= 1.140 /0.0625

= 18.24

Thus the atomic number of Oxygen from the data is 18.24

The balanced chemical equation for the given reaction is:

N₂ + 2O₂ → 2NO₂

According to the given balanced equation, 2 moles of O₂ combines with 1 mole of O₂

Given, Mass of O₂ = 1.140 g

Atomic mass of O = 16 amu

Molar mass of O₂ = 16 x 2 = 32 g/mol

Now to calculate the moles of N₂:

1.14 g of O₂ x (1 mole of O₂/ 32 g of O₂) x (1 mol of N₂/ 2 mol O₂) = 0.0178 mol of N₂

Molar mass = mass/ moles  

Given, Mass of N₂ = 0.500 g

Molar mass of N₂ = 0.500 g / 0.0178 mol = 28 g/mol

Atomic mass of N = 28/2 = 14 amu

Therefore, the atomic mass of N is 14 amu

Its D) the suns gravity keeps them in place.

Given the recursive function g(n) = g(n-1) + n with initial condition g(1)=0, we find g(2) = 2 by plugging n=2 into our equation, resulting in g(2) = g(1) + 2 = 0 + 2 = 2.

A recursive function is a function that calls itself in order to solve a problem. Recursion is a powerful programming technique that is particularly useful for solving problems that can be broken down into smaller, similar subproblems

The given recursive function is g(n) = g(n-1) + n,

with the initial condition that g(1)=0. We're asked to find the value of g(2).

We use the recursive definition to find g(2). Knowing that g(1) = 0, we plug n=2 into our equation: g(2) = g(2-1) + 2 which simplifies to g(2) = g(1) + 2 = 0 + 2 = 2. So, the value of g(2) is 2.

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Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral. The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number.

Final answer:

Atoms differ from one another based on their atomic number, which is the number of protons in the nucleus. This atomic number determines the chemical properties and identity of the element. Isotopes, atoms of the same element with different numbers of neutrons, have the same atomic number but different mass numbers.

Explanation:

Atoms of one element are distinct from those of another element primarily due to the number of protons, which is known as the atomic number (Z). This is a defining feature that gives each element its unique identity. For instance, all atoms of hydrogen have exactly one proton, while all atoms of iron have 26 protons. Not only do the protons differentiate elements, but they also contribute to the unique properties of each element, such as reactivity or physical characteristics. Furthermore, elements can have isotopes, which are atoms of the same element with the same number of protons but a different number of neutrons, leading to a variance in mass numbers. These isotopes behave similarly in chemical reactions but differ in mass and sometimes nuclear stability.

Isotopes and Chemical Identity

Isotopes are significant in that they are variations of the same element with different neutron counts. An example is carbon, which can have six, seven, or eight neutrons, resulting in different isotopes like Carbon-12, Carbon-13, and Carbon-14, each with unique mass numbers but the same atomic number of six. Even though isotopes of an element have slightly different physical properties, they possess the same chemical properties, which is why they react similarly in chemical processes.

Frictional force exists between your sled and the snow and is directed back up the hill!

The answer is condensation.

Have a great day :)

D.  The number of electrons equals the atomic number for a neutral element.  Each number after the letter refers to the number of electrons in that shell.  So for D, 2+2+6+2+6+2 = 20 electrons, which is equal to the atomic number.

D. 1s2 2s2 2p6 3s2 3p6 4s2

Hope this helps!

Answer:

B

Explanation:

30.97 g/mol

B. 30.97 g/mol. Molar mass of phosphorus (P) = 30.97 g/mol. So, the correct answer is B. 30.97 g/mol.

The molar mass of an element is the mass of one mole of atoms of that element, expressed in grams per mole (g/mol). To find the molar mass of phosphorus (P), we look at the periodic table to find the atomic mass of phosphorus.

The atomic mass of phosphorus (P) is approximately 30.97 atomic mass units (amu).

Since 1 mole of any element contains Avogadro's number of atoms (6.022 × 10²³), the molar mass of phosphorus (P) is equal to its atomic mass in grams:

Molar mass of phosphorus (P) = 30.97 g/mol

So, the correct answer is B. 30.97 g/mol.

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The number of protons in the nucleus always varies among atoms of different elements.

Every element has a different number of protons than every other element.

A.Carnivore that feeds on primary consumers.

Secondary consumers eat primary consumers. They are carnivores (meat-eaters) and omnivores (animals that eat both animals and plants).

We defined secondary consumers as organisms, primarily animals, which eat primary consumers. Furthermore, secondary consumers can be classified into one of two groups: carnivores, or meat eaters, and omnivores, which are plant and meat eaters.

Answer: prymairy

Explanation:

The motion of the kinetic molecules slows down

As per the law of conservation of mass, mass can be neither created nor destroyed. For example, in an isolated system the mass of the reactants is equal the mass of the products. In other words, the mass of system will not change over time or through any physical or chemical process.

In this case the initial mass of the board is 750 g. Although the system is physically transformed to sawdust by grounding, the mass or the 'quantity' of the board will remain unchanged. Therefore, mass of the pile of sawdust would be 750 g.

Ans: (a)

ganan electrones debido a que gracias a la regla del octeto alcanzan estabilidad de los gases nobles.

es la C

In chemical reactions between metals and nonmetals metals lose electrons and become positively charged ions or cations through a process called ionic bonding. An example of this process is when Sodium (Na) loses an electron to become Na+ and combines with Chlorine (Cl) to form Sodium Chloride (NaCl).

When metals like Na (Sodium) combine with nonmetals such as Cl (Chlorine), the metals lose electrons and become positively charged ions. This happens due to the process of ionic bonding where electrons are transferred from the metal atom to the nonmetal atom. In this case, Sodium loses one electron to become a cation (Na+), and Chlorine gains this electron to become an anion (Cl-). This difference in electric charge holds the atoms together, thus creating an ionic compound namely Sodium Chloride (NaCl).

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*(Answer)*= An ion can have a positive or negative charge. Furthermore, it is a an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

*(Request)*= Searching the definition can help you find a definition faster.

Hope this helps

User who Answered: BangtanBoyScouts

The other change that will occur in the bottle is that A. The air pressure will increase.

If volume changes in a closed container, while temeprature remains constant, the phenomenon is described by Boyle's Law:

[tex]P1*V1=P2*V2[/tex]

Let's give some arbitrary values to these variables:

P1= 1 atm

V1= 2 L

P2= ?

V2= 1 L

Calculating the final pressure (P2):

[tex]P2=\frac{P1*V1}{V2}=\frac{1 atm*2 L}{1 L}=2 atm[/tex]

So, the final pressure is higher than the initial pressure (P2>P1). That means that Pressure and Volume are inversely proportional.

Have a nice day!

Hey there!

Consider 100 g of solution:

Mass of NaCl = 3.50% of mass of seawater

( 3.50 / 100 ) * 100 => 3.50 g

Number of moles as shown below:

Molar mass NaCl = 58.44 g/mol

n = Mass / molar mass

n = 3.50 / 58.44 => 0.059 moles of NaCl

Mass of sweater:

Mass of solution -  Mass of NaCl

100 -  3.50 = 96.5 g

96.5 g in Kg :

96.5 / 1000 => 0.0965 Kg

Therefore ,calculate molality  by using  the  following formula:

molality =  number of moles  of solute / mass of solution

molality = 0.059 / 0.0965

molality = 0.61 m

Hope That helps!

The following are the matched results:

1.) Compression waves caused by movements in the earth's crust and which radiate outward from the source are Seismic Waves.

2.) The location on the surface of the earth directly above Focus of an earthquake is the Epicenter.

3.) The zone within the earth where rock displacement produces an earthquake is the Focus.

4.) A break in the lithosphere along which bodies of rock can move is called a Fault.

Final answer:

The correct matches are 1: C. Seismic waves, 2: D. Epicenter, 3: B. Focus, and 4: A. Fault. Seismic waves are the waves that emanate from the earthquake's origin, the focus is the origin point itself within the Earth, the epicenter is the direct point above the focus on the Earth's surface, and a fault is a fracture where rocks can move and cause earthquakes.

Explanation:

The correct match for the terms and their definitions related to earthquakes is as follows:

Compression waves caused by movements in the earth's crust and radiate outward from the source of an earthquake: C. Seismic waves

The location on the surface of the earth directly above the focus of an earthquake: D. Epicenter

The zone within the earth where rock displacement produces an earthquake: B. Focus

A break in the lithosphere along which bodies of rock can move: A. Fault

To elaborate, seismic waves (C) are the shock waves coming from the earthquake focus. The epicenter (D) is the point on the Earth's surface located directly above the earthquake focus. The focus (B) is where the rocks start to rupture and displace. Lastly, a fault (A) is where two blocks of the earth move relative to each other and can cause earthquakes when they move.

If I remember correctly the answer would be C.  Electronegativity increases going right from the Alkali Metals to the Noble Gasses with the gasses being the strongest.  Also going up from Ununoctium up to Helium.

Le Chatelier principle says, if a restriction is applied to a system in equilibrium, the system adjusts to a new equilibrium that tends to counteract the restriction. When equilibrium is under stress it will shift to relieve that stress.

or

all concentrations would change.

Answer: A system whose equilibrium has been upset will shift to restore equilibrium.

Explanation:

Answer: phase :option D

Particle :option C

Element : option B

Atom : option A

Explanation:

Answer:

Atom- the basic unit of an element

Element- a substance that cannot be broken down into a simpler substance

Particle- a tiny piece of matter

Phase-  a unique form of matter in which it can exist

Explanation:

I just ahd this on my quiz, swear its correct

Answer:- 126.53 g of Si are left.

Solution:- Let's calculate the moles of any of the product from the given grams of the reactants and see which one gives us less moles, that would be the limiting reactant and the other would be the excess reactant.  After this, we could calculate the used amount of the excess reactant and on subtracting this used amount from total given amount, the excess amount is calculated. The calculations are shown below:

[tex]167.00gSi(\frac{1molSi}{28.085gSi})(\frac{4molCr}{3molSi})[/tex]

= 7.928 mol Cr

Similarly the calculations of moles of Cr from other reactant:

[tex]146.00gCr_2O_3(\frac{1molCr_2O_3}{151.99gCr_2O_3})(\frac{4molCr}{2molCr_2O_3})[/tex]

= 1.921 mol Cr

[tex]Cr_2O_3[/tex] gives the less moles of the product and so it is limiting reactant and hence the excess reactant is Si.

Calculations for the amount of Si used to reactant with limiting reactant:

[tex]146.00gCr_2O_3(\frac{1molCr_2O_3}{151.99gCr_2O_3})(\frac{3molSi}{2molCr_2O_3})(\frac{28.085gSi}{1molSi})[/tex]

= 40.47 g Si

Amount of excess reactant(Si) left = 167.00 g - 40.47 g = 126.53 g

So, after the reaction is completed, 126.53 g of excess reactant(Si) are left.

The reaction between Si and Cr2O3 is limited by Cr2O3. When this has all reacted, there are 126.61 grams of Si remaining.

First, we need to calculate the amount of product that can be made with each reactant. Converting grams of reactant into moles allows us to do this. For silicon (Si), the molar mass is approximately 28.09 g/mol, so 167.00 g of Si is equivalent to 167.00 g / 28.09 g/mol = 5.95 moles of Si. For chromium(III) oxide (Cr2O3), the molar mass is approximately 151.99 g/mol, so 146.00 g of Cr2O3 is equivalent to 146.00 g / 151.99 g/mol = 0.96 moles of Cr2O3.

Looking at the balanced equation, we can see that the reaction stoichiometry is 3 moles of Si to 2 moles of Cr2O3. Hence, 5.95 moles of Si can react completely with 5.95 moles Si x (2 moles Cr2O3 / 3 moles Si) = 3.97 moles of Cr2O3. This is more than the 0.96 moles we have, indicating that Cr2O3 is the limiting reactant.

The amount of Si used up is therefore 0.96 moles Cr2O3 x (3 moles Si / 2 moles Cr2O3) = 1.44 moles Si. The remaining excess Si is 5.95 - 1.44 = 4.51 moles. Converting this back into grams gives us 4.51 moles Si x 28.09 g/mol Si = 126.61 g Si.

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There are 1.32 × 10²⁰ atoms in 43.2 mg of gold.

Step 1. Convert grams of Au to moles of Au

Moles of SF₆ = 0.0432 g Au × (1 mol Au/196.97 g Au) = 2.193 × 10⁻⁴ mol Au

Step 2. Convert moles of Au to atoms of Au.

Atoms of Au = 2.193 × 10⁻⁴ mol Au × (6.022 × 10²³ atoms Au /1 mol Au)

= 1.32 × 10²⁰ atoms Au

To find the number of gold atoms in 43.2 milligrams of gold, use Avogadro's number and mole concept.

The mass of a single gold atom is 3.27x10-22 grams. To calculate the number of gold atoms in 43.2 milligrams of gold, you can use the fact that there are 197.0 grams in a mole of gold and 6.022x1023 atoms in a mole.

First, find the number of moles of gold in 43.2 milligrams. Then, calculate the number of gold atoms by multiplying the number of moles by Avogadro's number.

Therefore, the number of gold atoms in 43.2 milligrams of gold would be approximately[tex]1.04 \times10^{19[/tex] atoms.

Hey there!

Mass = 43.5 g

Volume = 50 mL

Therefore:

D = m / V

D = 43.5 / 50

D = 0.87 g/mL

Hope that helps!

The equation we need to use to solve this is: c=λν

c is the speed of light (2.998 x 10^8 m/s)

λ is the wavelength, which we're gonna solve for

ν is the frequency ( 2.4 x 10^14 Hz )

First, plug in the values we were given into the equation

2.998 x 10^8 m/s= (λ)(2.4 x 10^14 Hz)

Next, divide both sides of the equation by 2.4 x 10^14 Hz to solve for the wavelength (λ)

λ= 1.249166667 x 10^-6 m

Round to 2 significant figures

λ= 1.2 x 10^-6 m

This would be the downward movement of water. It begins flowing and continues in a downward movement moving throughout,

When the water vapor condenses into larger droplets in the clouds, the formation of rain occurs. The precipitation that flows into river, lakes, and streams is called the rain.

The droplets of water which are condensed as a result of the evaporation is defined as the rain. The formation of clouds takes place during the water cycle. Rain is also called the precipitation. This flows in to all water bodies like river, lakes, etc.

The hot air containing water molecules from different places rises above the ground level and after reaching a particular height it will expands and cools. The process in which the droplets of water changes into water vapor is called the condensation.

The cluster of water droplets combine together to form heavy water masses. When they grow big, they fall down into the atmosphere as rain. They are precipitations. These may be in the form of snow, hail, etc.

Thus the precipitation that flows into river, lakes, and streams is the rain.

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One Mn atom contains 5 electrons in it's 3d subshell.

Mn atom has [tex]$\boxed5$[/tex] electrons in its 3d subshell.

Further explanation:  

The electronic configuration is the distribution of electrons of an atom in the atomic orbitals. There are two states for an electron: ground as well as the excited state. The configuration of the atom in the lowest possible energy levels is called the ground-state electronic configuration. When an electron jumps from the stable ground state to some higher level, that state is called the excited state and the electronic configuration corresponding to this state is known as the excited-state half-filled configuration.

The filling of electrons in different energy levels or orbitals is done in accordance with the following three rules.

1. Aufbau principle: The principle states that the electrons are filled in various orbitals in the increasing order of their energies as follows:

1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p<7s<5f<6d<7p

2. Hund’s rule: Electron pairing will not start until each orbital is singly occupied.

3. Pauli’s exclusion principle: According to this principle, all the four quantum numbers [tex]$$\left({n,\;l,\;{m_l},\;{m_s}}\right)$$[/tex] for any two electrons can never be the same. In an orbital, the spin of two electrons has to be different. If one electron has the clockwise spin, the other would have the anticlockwise spin and vice-versa.

Manganese is a transition metal of the first transition series. The atomic number of Mn is 25. Its electronic configuration is [tex]$$\left[{{\text{Ar}}}\right]\;3{d^5}4{s^2}$$[/tex] . It has half-filled d-subshell. (Refer to the attached image). So the total number of electrons in 3d subshell of Mn is 5.

Learn more:

1. Determine the ion with configuration [tex]$$\left[{{\text{Ar}}}\right]\;3{d^2}$$[/tex] : https://brainly.com/question/7599542

2. Identification of element which has electron configuration [tex]$$1{s^2}2{s^2}2{p^2}3{s^1}$$[/tex] : https://brainly.com/question/9616334

Answer details:

Grade: High School

Subject: Chemistry    

Chapter: Electronic configuration of the elements

Keywords: Mn, electrons, 3d subshell, 5 electrons, transition metal, 25, transition series, half-filled, aufau principle, Pauli’s exclusion principle, Hund’s rule.

N is the unit of force. It stands for Newton.

M is the unit of length.

It stands for Meter.

It is the basic difference between the two units N and M.

Answer: N - Newton; M - Meter

Shoutout to: @Sidyandex

why; live

The number of moles of Nitrogen in 0.209g of N2O is calculated by finding the molar mass of N2O first, then dividing the given mass of the compound by the molar mass. Next, multiply the result by 2 as each molecule of N2O contains 2 atoms of Nitrogen. The answer is 0.0095 moles.

To calculate the number of moles of N in 0.209 g of N2O, we first need to compute the molar mass of N2O. The molar mass of N2O is calculated by adding twice the molar mass of Nitrogen (N) and the molar mass of Oxygen (O). Given that one mole of Nitrogen weighs 14g and one mole of Oxygen is 16g, the molar mass of N2O is<(strong>2 mol nitrogen) (14 g/mol) + (1 mol oxygen) (16.0 g/mol) or 44g/mole.

Next, we calculate the number of moles by dividing the given mass (0.209g) by the molar mass of the compound. Using moles = mass/molar mass, we get moles of N2O = 0.209g / 44g/mole = 0.00475 moles.

Since nitrogen, N, exists as a diatomic molecule in N2O, each mole of N2O contains 2 moles of Nitrogen. Therefore, in 0.00475 moles of N2O, the number of moles of Nitrogen, N will be 2 * 0.00475 = 0.0095 moles.

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Try the third option