A certain atom has 22 protons and 19 electrons. This atom loses an electron. The net charge on the atom is now 4+. If this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be

(a) The heat generated in the process is 28 kJ.

(b) The work done in the process is determined as -28 kJ.

(c) The change in the internal energy is 0.

The heat generated in the process is negative done in the process.

W = -PΔV

W = -P(V₂ - V₁)

W = -P(VB - VA)

W = -11(7 - 12.5)

W = 60.5 L.atm = 60.5 x 101.325 J/L.atm = 6,130.16 J

W = -25(20.5 - 7)

W = -337.5 L.atm = -34,197.18 J

Total work , w = -34,197.18 J +  6,130.16 J = -28 kJ

q = - w

q = 28 kJ

ΔE = q + w

ΔE = 28 kJ - 28 kJ = 0

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Answer:

See below

Explanation:

Boiling point of water is 100 C

 this substance is higher boiling point and the molecules are likely with higher e-static forces

The unknown substance has a higher boiling point than water, and it has stronger electrostatic forces between its molecules than water. Therefore, option B is correct.

Boiling point is a measure of the temperature at which a substance changes from a liquid to a gas phase. Substances with higher boiling points generally have stronger intermolecular forces, such as hydrogen bonding or stronger dipole-dipole interactions.

Since the boiling point of the unknown substance is higher than that of water (which boils at 100°C), it suggests that the unknown substance likely has stronger electrostatic forces between its molecules compared to water.

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Answer:

It represents the number of atoms of that particular element present in the compound. In C₂H₄O₂ there are 2 Carbon atoms, 4 Hydrogen atoms and 2 Oxygen atoms.

Answer: Scientists make designs based on engineering knowledge and

then make it available for public use.

Answer:

Neutral

Explanation:

NaCl aqueous solution is formed by NaOH and HCl.

NaOH is a base and HCl is an acid, so they go through neutralization process forming a neutral salt and water.

Answer:

2C2H6 + 7O2 ==> 4CO2 + 6H2O

When dealing with gases, it is possible to use liters and mols interchangeably.

So 4.00 L C2H6 x (7 mols O2/2 mols C2H6) = 4.00 x 7/2 = ? L O2

Explanation:

Answer: Entropy is sometimes described as the degree of randomness in a system.

Answer:

1.) 2 molecules

2.) 4 H atoms, 2 S atoms, 2 O atoms

3.) 8 total atoms

Explanation:

1.) 2 H₂SO

--------> The molecule is all of the elements bonded together (H₂SO). Because there is a coefficient of 2 in front of the molecule, this means that there are 2 molecules present.

2.) 2 H₂S₁O₁

---------> The number of atoms of each element is determined by the subscripts and the coefficients. In one molecule, there is one oxygen, one sulfur, and 2 hydrogen atoms (denoted by subscripts). Because there are two molecules, these values are doubled.

3.)

--------> The total number of atoms is calculated by adding the number of atoms of each element. If between 2 molecules there are 4 hydrogens, 2 sulfurs, and 2 oxygens, combined there would be a total of 8 atoms.

Answer: It shows whether the reaction is exothermic or endothermic.

Explanation:

Answer:

It helps compare frequencies of light.

Explanation: Hope it helps you :)))))

Have a good day.

Answer: A:  It helps compare frequencies of light.

Explanation:

Benzene be B

Toluene be T

We have made then one lettered to make things easier

[tex]\\ \rm\Rrightarrow \dfrac{P^0_B-P_B}{P^0_B}=x_B[/tex]

[tex]\\ \rm\Rrightarrow 95.1-P_B=95.(0.5)[/tex]

[tex]\\ \rm\Rrightarrow 95.1-P_B=47.55[/tex]

[tex]\\ \rm\Rrightarrow P_B=47.55mmHg[/tex]

And

[tex]\\ \rm\Rrightarrow \dfrac{P^0_T-P_T}{P^0_T}=x_T[/tex]

[tex]\\ \rm\Rrightarrow 28.4-P_T=28.4(0.5)[/tex]

[tex]\\ \rm\Rrightarrow P_T=14.2mmHg[/tex]

Total vapour pressure

The mass % will be affected by 0.25%.

Mass Percentage is defined as the grams of solute per gram of solution , multiplied by 100%

It is given that

She used the pipette properly but it consistently delivered 4.70 cm³ of vinegar instead of the desired 5.00 cm³.

Mass Percentage affected = ?

Mass is directly proportional to the volume

For calculating ratios of the  same compound the density can be neglected

the density of vinegar is 1.05 gm/cm³

mass for 5cm³= 5*1.05 = 5.25gm

mass for 4.75 cm³ = 4.9875 gm

for 100 gm solution

mass% expected = 5.25* 100/100 = 5.25%

mass % (actual) = 4.9875 / (100-0.2625) = 5%

Therefore the mass % will be affected by 0.25%.

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Answer:

The speed of light is the speed at which light travels. No, an object cannot move at the speed of light.  

Explanation:

The speed of light is 186,000 miles per second. An object with mass cannot move at the speed of light since it would take an infinite amount of energy to achieve that velocity, since only massless particles can travel at the speed of light. Also, you would have to factor in air friction, meaning even if an object were to reach such high speeds, it would instantly disintegrate.

Answer:

carbonhydrates, fats and ptoteins

Answer:3 carbohydrates, fats, and proteins

Explanation:

A gas that occupies 4.31 litres at a pressure of 0.755 atm will have a temperature of 39.58°C. Details about temperature can be found below.

The temperature of a gas can be calculated using the following formula:

PV = nRT

Where;

0.755 × 4.31 = 1 × 0.0821 × T

3.25 = 0.0821T

T = 3.25 ÷ 0.0821

T = 39.58°C

Therefore, a gas that occupies 4.31 litres at a pressure of 0.755 atm will have a temperature of 39.58°C.

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Answer:

3/22.4

Explanation:

Answer:

20(50) = 40(V₂)

⇒1000 = 40V₂

⇒V₂ = 1000/40

⇒ V₂ = 25 mL

Explanation:

Answer:

25.0 mL

Explanation:

I took the test and got it right :)

The molality of the sugar solution is 0.034 mol/kg.

The molality and molarity of a chemical solution are equivalent for aqueous solutions of covalent molecules, such as sugar.

Answer:

31°C

Explanation:

Using the ratio, we can find the temperature of the gas at 705mm.

 725mm : 32°C

 705mm : x

[ x is the temperature we have to find ]

Cross multiply the ratios.

 725x = 705 × 32

 725x = 22560

 x = [tex]\frac{22560}{725}[/tex] = 31°C

Answer:

3150.5g

Explanation:

1 mole of nitric acid weighs 63.01g

so i did 63.01g times 50.0g which equals 3150.5g

g= Grams

Hope This Helped

Answer:

0.79 moles

Explanation:

Formula :

Number of moles = Weight of substance / molecular mass

=============================================================

Here :

⇒ Weight of HNO₃ = 50 g

⇒ Molecular mass = 63 g

============================================================

Solving :

⇒ Number of moles = 50/63

⇒ Number of moles = 0.79 moles

The wavelength of the radiation is 4.7 x 10⁻⁹ m

What is the Einstein's Formula for Energy?

The energy

E is given, from Einstein's formula, as:

E=h⋅ν

Where:

h=6.63×10⁻³⁴Js is Planck's constant;

ν is the frequency.

You can relate frequency and wavelength

λ through the speed of light c as:

c=λ⋅ν

So finally you get:

E=hc/λ

It is given in the question

The energy of a photon is 4.23 x 10⁻¹⁷ J.

Wavelength = ?

λ = hc/E

λ = 6.63×10⁻³⁴x 3 x 10⁸ /  4.23 x 10⁻¹⁷

λ = 4.7 x 10⁻⁹ m

Therefore the wavelength of the radiation is 4.7 x 10⁻⁹ m .

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Answer:

M=93.5g/mol

Explanation:

I did this in class and it was a review. :)

The source of the forces that move the tectonic plates along this plate

boundary is the convection current in the mantle. Hence, the correct

option in option (B)

Tectonic plates refers to the Spheres that are found in the uppermost Mantle of the Earth .

The Tectonic plates are also called the Litosphere .

The Motion of the Plates about the axis causes the Tectonic demarcations which are Know as the

Convergent

Divergent

Transform

Now these Plate are formed by the Convection of Currents in the Earths's Mantle

That is, the Dynamics of Current in and around the Earths Mantle brings about the tectonic plates

Hence the the correct option in option (B)

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Convection currents in the mantle is the source of the forces that move the tectonic plates along this plate boundary and is denoted as option B.

This is referred to the process of heat transfer in a fluid such as gases and liquids.

The convection currents in the mantle is responsible for the force present in the tectonic plates.

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Answer:

hot

Explanation:

You'll need to boil the solution, though, to reduce the amount of water so that it is concentrated enough to form crystals. Cook your solution over low to medium heat for about an hour. You want to reduce it down to 1 cup or less.

Answer:

3p^2

Explanation:

after filling 3s^2 only two electrons  left out of 14 so the next sub shell is 3p therefore ,X represents 3p^2

.we can read the chemical preparation of the reaction as: "4 g of hydrogen react with 32 g of oxygen to give 36 g of water".   :)

Answer:

You will typically get another chance to retake the exam

Answer:

well you either have a chance to retake the test if your teacher or just not let you take it at all. you have to pass 4 regents test including chemistry in order to get a regent diploma. so you can either retake or it you just failed it.

Answer:

Explanation:

4NH₃ (g) + 3O₂ (g) ⇒ 2N₂ (g) + 6H₂ O(1)

Δ[tex]H_r={\sum}{ \Delta }H_f(\text{product})-{\sum}{ \Delta }H_f(\text{reactant})[/tex]

ΔH r =(2ΔH f(N 2 )+6ΔH f (H 2 O(l)))−(4ΔH f​ (NH 3 (g))+3ΔH f (O 2 (g)))

ΔH rex =[2×0+6×(−286)]−[4×(−46)+3×0]=−1716+186

ΔH rex =−1532kJ/mol

Thermodynamics is a branch of physical chemistry that studies heat and its effects and interactions. Governed by the four main laws, thermodynamics plays a huge role in physics and chemistry, and is also responsible for the law of conservation of energy, a fundamental rule in science.

Answer:

As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder. Relative sound intensities are often given in units named decibels (dB).

Explanation: