Melting is a phase change in which the molecules involved experience _ in kinetic energy and _ on potential energy.

a) no change; no change
b) no change; an increase
c) a decrease; no change

True. The subscripts in a chemical formula represent the relative number of atoms of each element in a compound. They indicate the ratio of atoms present and remain constant for a given compound.

Changing the subscripts would alter the composition and stoichiometry of the compound.

forces between the negatively charged electron and the positively charged nucleus, allowing the electron to be completely removed from the atom. It is typically measured in units of electron volts (eV) or kilojoules per mole (kJ/mol). Ionization energy is influenced by factors such as the atomic structure, electron shielding, and the effective nuclear charge experienced by the outermost electrons. The ionization energy generally increases as you move across a period in the periodic table due to increased nuclear charge and decreased atomic radius. It also decreases as you move down a group due to increased electron shielding and atomic size. Ionization energy plays a crucial role in understanding chemical reactions, electron configurations, and the reactivity of elements.

Learn more about  chemical    here:

https://brainly.com/question/29240183

#SPJ11

Answer:

I can't draw diagrams on this web site but I can do with numbers I think. So an electron is moved from n = 1 to n = 5. I'm assuming I've interpreted the problem correctly; if not you will need to make a correction. I'm assuming that you know the electron in the n = 1 state is the ground state so the 4th exited state moves it to the n = 5 level.

n = 5 4th excited state

n = 4 3rd excited state

n = 3 2nd excited state

n = 2 1st excited state

n = 1 ground state

Here are the possible spectral lines.

n = 5 to 4, n = 5 to 3, n = 5 to 2, n = 5 to 1 or 4 lines.

n = 4 to 3, 4 to 2, 4 to 1 = 3 lines

n = 3 to 2, 3 to 1 = 2 lines

n = 2 to 1 = 1 line. Add 'em up. I get 10.

b. The Lyman series is from whatever to n = 1. Count the above that end in n = 1.

c.The E for any level is -21.8E-19 Joules/n^2

To find the E for any transition (delta E) take E for upper n and subtract from the E for the lower n and that gives you delta E for the transition.

So for n = 5 to n = 1, use -Efor 5 -(-Efor 1) = + something which I'll leave for you. You could convert that to wavelength in meters with delta E = hc/wavelength. You might want to try it for the Balmer series (n ending in n = 2). I think the red line is about 650 nm.

Explanation:

Answer:

5.4 × 10 3

Explanation:

Answer:

5.4 × 10^3.

Explanation:

Not 5.49 × 10^3, 5.4 × 10^7, or 5.5 × 10^3.

If an electric discharge produce 300 L of ozone(O₃), the liter of oxygen(O₂) are required is 450 L.

The reaction is as follows :

3O₂  --->  2O₃

The volume of the Ozone = 300 L

The mole ratio is given as :

3 moles of the oxygen that is O₂  will produce the 2 moles of the ozone that is O₃.

The number of the moles is as follows :

The number of moles = mass / molar mass

The 300 L of the ozone will required the oxygen is as :

To produce 300 L of ozone  = ( 3/2 ) × 300 L of the oxygen required

                                               = 1.5 × 300 L

                                               = 450 L

Thus, the 450 L of the oxygen is required to produce the 300 mL of the ozone .

To learn more about ozone here

https://brainly.com/question/22172775

#SPJ4

A coffee cup temperature  with a heat capacity of 6. 70 J/∘ C was used to measure the change in enthalpy of a precipitation reaction.The value of ΔHrxn was found to be 61.9 kJ/mol.

Calculate the enthalpy of reaction, ΔHrxn, per mole of precipitate formed (AgSCN). Assume the specific heat of the product solution is 4. 11 J / (g⋅∘C) and that the density of both the reactant solutions is 1. 00 g/mL.1. Calculation of Moles of precipitate formed from AgNO3:To find the value of ΔHrxn, we used the formula ΔHrxn = Qsolution/n, where Qsolution is the heat change produced by the solution process and n is the number of moles of AgSCN formed.

To find the value of n, we first calculated the number of moles of AgNO3 and KSCN used in the reaction using the formula n = M × V.To find the heat change produced by the solution process, we used the formula

Q = m × c × ∆T,

where Q is the heat change, m is the mass of the product solution, c is the specific heat capacity of the product solution, and ∆T is the change in temperature of the solution.The value of ΔHrxn was found to be 61.9 kJ/mol.

To know more about temperature  Visit;

https://brainly.com/question/29072206

#SPJ11

The number of grams of helium in a balloon at a pressure of 99.8 kPa, a temperature of 301 K, and a volume of 0.785 L would be 0.125g.

The mass of a substance can be calculated by multiplying the number of moles by its molar mass.

However, the number of moles of helium must be calculated as follows:

PV = nRT

Where;

0.985 × 0.785 = n × 0.0821 × 301

0.773 = 24.7n

n = 0.773 ÷ 24.7 = 0.031moles

mass of He = 0.031 × 4 = 0.125g

Therefore, the number of grams of helium in a balloon at a pressure of 99.8 kPa, a temperature of 301 K, and a volume of 0.785 L would be 0.125g.

Learn more about mass at: https://brainly.com/question/19694949

#SPJ6

Answer:

its 1 transferd electrons 2 shared electrons 3 metal only

Explanation:

Answer:

1 transferd electrons 2 shared electrons 3 metal only

Explanation:

Acetylene and oxygen are converted throughout the process into carbon dioxide and water vapour, producing 566 kJ of heat for each mole of acetylene burned.

The heat released throughout the process may be calculated using the change in enthalpy, often known as the heat of reaction or the enthalpy of reaction. Using the enthalpy values of the products and reactants, one can determine the change in enthalpy, which is determined by the difference between the enthalpies of the products and the reactants. The balanced chemical equation for the burning of acetylene is 2 C2H2 + 5O2 4 CO2 + 2 H2O, and the change in enthalpy, or heat released, is -566 kJ/mol. This indicates that the process transforms acetylene and oxygen into carbon dioxide and water vapour, releasing 566 kJ of heat for every mole of acetylene burnt.

learn more about acetylene here:

https://brainly.com/question/28916568

#SPJ4

Answer:

35.62%

Mass percent composition of K = 0.3562 x 100% Mass percent composition of K = 35.62%

Explanation:

When a 90 g  of NaOH is dissolved in water and the solution is diluted to give a final volume of 3 liters the molarity of the final solution is 0.75 M.

To find the molarity of the final solution, we need to first calculate the number of moles of NaOH present in the solution.

The formula for calculating the number of moles of a substance is:

moles = mass / molar mass

The molar mass of NaOH is 40.00 g/mol, so the number of moles of NaOH present in the 90.0 g sample can be calculated as:

moles = 90.0 g / 40.00 g/mol

moles = 2.25mol

Given , volume = 3 L

Now we can use the formula:

Molarity = moles / volume

to calculate the molarity of the concentrated NaOH solution:

Molarity = 2.25 mol / 3.00 l

Molarity = 0.75 M

Therefore, the molarity of the final NaOH solution is 0.75 M.

To know more about molarity here

https://brainly.com/question/31473692

#SPJ4

Answer:

Explanation:

The Hawaiian Islands were literally created from lots of volcanoes—they're a trail of volcanic eruptions. In the case of the Hawaiian Islands, the Pacific Plate is continually moving to the northwest over the Hawaiian hot spot. This movement caused the Hawaiian chain of islands to form.

Answer:

A plant cell contains a large, singular vacuole that is used for storage and maintaining the shape of the cell. In contrast, animal cells have many, smaller vacuoles. Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane.

Answer:

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Chemical reactions are an integral part of technology, of culture, and indeed of life itself. Burning fuels, smelting iron, making glass and pottery, brewing beer, and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years. Chemical reactions abound in the geology of Earth, in the atmosphere and oceans, and in a vast array of complicated processes that occur in all living systems.

Explanation:

hope it help

plss brainlys me

Answer:

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products

Explanation:

Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Generating electricity from the given list option is the use of geothermal, therefore the correct option is A .  

It is a type of power plant in which the power is generated with the help of a nuclear reactor involving a nuclear which could be either nuclear fission or fusion reaction.

Fueling vehicles, capturing solar power, and powering hybrid vehicles do not use geothermal energy.

Generating electricity from the given list option is the use of geothermal, therefore the correct option is A.

To learn more about Nuclear power plants here, refer to the link ;

brainly.com/question/4246037

#SPJ1

Answer:

First one. V1/T1=V2/T2

If the pressure is the same.

Explanation:

Answer:

A on edge2021

Answer: Crystals differ in physical properties, i.e., in hardness, cleavage, optical properties, heat conductivity, and electrical conductivity.

These properties are important since they sometimes determine the use to which the crystals are put in industry.

hope this helps :)

Answer:

A crystals key properties are hardness, cleavage, optical properties, heat conductivity, and electrical conductivity.

Explanation:

These properties are important since they sometimes determine the use to which the crystals are put in industry.

To find the mole fraction of hydrochloric acid (HCl) in the solution, we need to use the definition of mole fraction, which is the ratio of moles of the solute to the total moles in the solution.

The mole fraction (X) of HCl can be calculated as follows:

Mole fraction of HCl = Moles of HCl / Total moles in the solution

Given that the molality (m) of HCl is 7.29 m, we can determine the moles of HCl per kilogram of solvent (water) using the molality formula:

Moles of HCl = Molality × Mass of solvent (in kg)

To calculate the mole fraction, we need to know the mass of the solvent used. Let's assume we have 1 kilogram (1000 grams) of water as the solvent.

Moles of HCl = 7.29 m × 1000 g

= 7290 moles of HCl

Total moles in the solution = Moles of HCl

Therefore, the mole fraction of HCl in the solution is:

Mole fraction of HCl = 7290 moles of HCl / (7290 moles of HCl)

= 1

The mole fraction of HCl in the solution is 1, indicating that the entire solution is composed of HCl.

To know more about mole fraction, click here:

https://brainly.com/question/30724931

#SPJ11

Answer:

STP in chemistry is the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atm pressure.

Answer:

342. 15 g/mol is the mass

Al Aluminium 26.98g 2 atoms per mole = 15.7716%

S Sulfur 32.06g 3 atoms per mole = 28.1151%

O Oxygen 15.99g 12 atoms per mole = 56.1133%

Explanation:

Hope this helps

Answer:

15,7%

Explanation:

What is the percentage of Aluminum in Aluminum Sulfate?

Aluminum Sulfate

is Al2 (SO4)3

its molar mass is

(2 X 27) + (3 X 96) = 54 + 288 = 344

THE % Al IS (54 /344) X 100 = 15,7%

Answer:

false i am pretty sure because dead flowers.

Answer:

The answer is 2.

Explanation:

Answer: Zelda should place one container of water in sunlight (by a window or outdoors) and the other container in a dark room (closet) away from the sun.

Explanation: This would allow Zelda to test two different settings (sun and no sun) so she can test her hypothesis.

The volume of 80.175 liters occupy at 25 degree c if the pressure were decreased to 730 torr. It is calculated from the expression of Boyle's Law.

According to the Boyle's Law, an inverse relationship exists between pressure and volume. if the number of molecules (n) and the temperature (T) are both constant. Boyle's Law is used to predict the result of introducing a change in volume and pressure only and only to the initial state of a fixed quantity of gas.

The relationship for Boyle's Law can be expressed as follows,

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume values, and P2 and V2 are the values of the pressure and volume of the gas after change.

A sample of oxygen occupies 47.2 liters under a pressure of 1240 torr at 25oc.

P1 = 1240 torr

V1 = 47.2 liters

P2  = 730 torr

V2 =  P1 V1 / P2

putting all values we get,

V2 = 1240 * 47.2 / 730

     =  80.175 liters

To learn more about Boyle's law please visit:

https://brainly.com/question/1696010

#SPJ4

Answer:

2 mol KOH

Explanation:

                          KOH + HNO3 ---> KNO3 + H2O

from reaction   1 mol    1 mol

given                x mol    2 mol

x = 1*2/1 = 2 mol

Answer:

Option C = 150

Explanation:

First of all we will understand what is law of conservation of mass.

Law of conservation of mass:

This law stated that, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six number of carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of chemical equation so this reaction followed the law of conservation of mass because mases are same on both side.

In given chemical reaction:

AB    + CD      →      X

50 g +  100 g    =  150 g

Thus option c is correct.

Answer:

0.20 moles

Explanation:

In order to solve this problem it is necessary to keep in mind the definition of molarity:

If we input the data given by the problem we're left with:

Meaning that we can proceed to calculate the number of moles:

The number of moles of glucose (\(C_6H_{12}O_6\)) in 0.500 Liters of a 0.40 M solution is 0.2 moles.

Given the following data:

To determine the number of moles of glucose (\(C_6H_{12}O_6\)) in 0.500 Liters of a 0.40 M solution:

Mathematically, the molarity of a solution is given by the formula:

\(Molarity = \frac{number\;of\;moles}{Volume \;in\;liters}\)

Making number of moles the subject of formula, we have:

\(Number\;of\;moles = Molarity \times Volume\)

Substituting the given parameters into the formula, we have;

\(Number\;of\;moles = 0.40 \times 0.500\)

Number of moles = 0.2 moles.

Read more: https://brainly.com/question/13750908

Answer:

Save earth, and universe

Sample X is best classified as a heterogeneous mixture

Homogenous mixture has the same uniform composition and appearance through out the reaction and it is difficult to separate the substrates present in it.

A heterogeneous mixture contains of visibly  different phases or substances. Here separating the mixture becomes easy.

In the given question When sample X is passed through the filter paper we see that a white residue is remaining which is Y. This itself suggests that the the mixture is heterogeneous mixture.

As we initially got the residue it suggests that the solution is a homogenous mixture as we can now differentiate two substances

To know more about heterogenous mixtures

https://brainly.com/question/24898889

#SPJ1

Aerobic organisms must have oxygen in order to develop, breathe, metabolize, and use other vital routes. At the end of the electron transport chain during respiration in these organisms.

oxygen acts as an electron acceptor. Hence, when an obligatory aerobe is incubated in anaerobic conditions, they are unable to grow because there is no oxygen present, which in turn restricts its respiration and metabolism.

An electron is a subatomic particle with a negative charge that orbits the nucleus of an atom. It has a relative mass of 9.109 x 10⁻³¹ kg, which is about 1/1836th the mass of a proton. Electrons are responsible for the chemical behavior of atoms, as they are involved in the formation of chemical bonds between atoms. They also play a crucial role in electricity and magnetism, as they are the carriers of electrical charge and can produce magnetic fields. Electrons exist in energy levels around the nucleus, and they can absorb or emit energy to move between energy levels, giving rise to the emission and absorption of light and other electromagnetic radiation. Electrons are also used in various technologies, including electronics, telecommunications, and medical imaging.

Learn more about electron here:

https://brainly.com/question/11134441

#SPJ4