What is the frequency of electromagnetic radiation needed to excite an electron in a hydrogen atom from the n = 3 orbit to the n = 6 orbit? How much energy does 800. millimoles of these photons have?

Answer:

3.12g FeO3

14.33g MgCO3

5.92g Ca(OH)2

Explanation:

For the first problem, convert grams of Fe to mols of Fe.

molar mass of Fe: 55.845

Grams of Fe: 3.4g

3.4/55.845 = 0.06 mol Fe

There are 4 Fe for every 2 FeO3

So.. 0.06(2/4) = 0.03 mol FeO3

Multiply the mols by the molar mass of FeO3

Molar mass of FeO3: 103.845

0.03 * 103.845 = 3.12 g FeO3

Answer:

4170 j

Explanation:

water has low melting point

Using Avogadro's law, we know the amount of moles in the sample is

[tex]\frac{6.87 \times 10^{23}}{6.022 \times 10^{23}}=1.1408170043175 \text{ mol}[/tex]

Therefore, the atomic mass is:

[tex]\frac{26.1}{1.1408170043175}=\boxed{22.9 \text{ g/mol (to 3 sf)}}[/tex]

Correct option:

Beta particles are identical to "electrons".          

What are particle beams:

There are various types of particle beams, such as (alpha) and (beta) particles, neutron beams, etc. While β-particles are electrons released from a nucleus, helium nuclei made up of two protons and two neutrons are known as α-particles.

When certain radionuclides undergo a process known as beta-decay, high-energy, high-speed electrons (e-) or positrons (p+) are released from the nucleus.

An electron and a beta particle share the same mass and charge.

Beta radiation in high doses can burn the skin, and beta emitters are dangerous if they penetrate the body. Thin sheets of metal or plastic may be able to stop beta particles.

Note: Your question is incomplete, but most probably your full question also includes one more option "Electron".

Beta particles are identical to

Multiple Choice

1. protons.  2. helium atoms.  3. hydrogen atoms.  4. helium nuclei. 5. electrons.

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Answer:

Explanation:

Food wrappers and aluminium wrappers are widely use for packing various eatable items.

For example, in our homes our mother wraps our food for lunch in aluminium foil.

As it helps in keeping the food warm for hours.

Thus, we can conclude that out of the given options, a packaging waste is the garbage collector collecting.

The Answer to the question is 133.34 grams approximately.

As Al is in excess so, complete HCl will consume in reaction.

Molar Mass of HCl = Atomic mass of H + Atomic mass of Cl

Molar Mass of HCl = 1 + 35.45 = 36.45

Number of moles of HCl which reacting will excess Al are

moles = given mass / molar mass

moles = 108 / 36.45 = 2.96 moles of HCl

So 2.96 moles of HCl are taking part in reaction which is approximately 3 moles

The chemical reaction is as follows as:

3 HCl + (excess) Al →  AlCl₃ + 3 H

It is clear from the reaction that 3 moles of HCl are making 1 mole of AlCl₃

So in our reaction also 3 mole of HCl is taking part which mean that it will form 1 mole of AlCl₃ .

1 mole AlCl₃ = mass formed AlCl₃ / molar mass of AlCl₃

mass formed AlCl₃ = molar mass of AlCl₃

mass formed AlCl₃ = 133.34 grams

So, approximately 133.34 grams of AlCl₃ is formed when we react 108 grams of HCl with excess AlCl₃.

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9.331 x  [tex]10^{23}[/tex] many individual oxygen atoms are contained in a sample of P₂O5 that also contains 0.620 moles of P.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

[tex]P_2O_5[/tex] →  [tex]2P^+{^5} + 5O{^-^2}[/tex]

Given:

0.620 moles of P

Let us assume a mole of oxygen atoms.

2÷0.620 = 5÷a                    Cross Multiply

2a = 0.620 x 5                   Divide both sides by 2

a= 0.310 x 5                      Combine

a = 1.55                              moles of oxygen.

Atoms are there in 1.55 moles of oxygen:

1 mole of anything contains 6.02 x [tex]10^{23}[/tex] items of  that mole

1.55 moles of oxygen contain x  atoms of oxygen

1÷1.55 = 6.02 x [tex]10^{23}[/tex] ÷x                  Cross multiply

1 x a = 1.55 x 6.02 x [tex]10^{23}[/tex]                   Combine

a = 9.331 x  [tex]10^{23}[/tex]

Hence, 9.331 x  [tex]10^{23}[/tex] many individual oxygen atoms are contained in a sample of P₂O5 that also contains 0.620 moles of P.

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Explanation:

The transition metals have the following physical properties in common:

they are good conductors of heat and electricity

they can be hammered or bent into shape easily

they have high melting points (but mercury is a liquid at room temperature)

they are usually hard and tough

they have high densities

The transition metals have the following chemical properties in common:

they are less reactive than alkali metals such as sodium

they form coloured ions of different charges

some are very unreactive (silver and gold)

many are used as catalysts

Answer:

13

Explanation:

because the number of protons and electrons in the atom are the same

What happens when carbon dioxide builds up in your lungs?

If the person's breathing passage were filled with carbon dioxide instead of air, it would lead to respiratory failure.

Signs of respiratory failure:

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According to Boyle's law of gases, the volume  of the gas will decrease when increasing the pressure of the gas in the syringe by adding weights above the syringe.

Boyle's law of gases states that the pressure of a given mass of gas is inversely proportional to the volume of the gas.

In the given, increasing the pressure of the gas in the syringe by adding weights above the syringe will result in a decrease in the volume of the gas.

On the other hand, decreasing the pressure will result in an increase in the volume of the gas.

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Answer:

1. 3.498

2. 1.37

3. 37.5

4. 51.4

Explanation:

The given reaction is a double replacement reaction; option B.

A chemical reaction is a reaction in which chemical changes occurs in the atoms of reactants which results in the formation pf products.

The given reaction is as follows:

Since exchange of ions occur, it is a double replacement reaction.

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Answer:

B.) Experimental

Explanation:

in an experimental investigation you have control over different variables you are testing so that makes this the most accurate answer.

The kind of investigation that allows for the control of variables is an experimental investigation.

In an experimental investigation, researchers manipulate or control certain variables while keeping others constant. This allows them to determine the cause-and-effect relationship between variables.

To conduct an experimental investigation, researchers typically follow these steps:

1. Formulate a hypothesis: A hypothesis is a testable statement that predicts the relationship between variables. It provides the basis for the experiment.

2. Identify variables: Variables are the factors or conditions that can be manipulated or measured in an experiment. In an experimental investigation, researchers typically have an independent variable and a dependent variable .

3. Control variables: In order to isolate the effect of the independent variable on the dependent variable, researchers need to control or keep constant other variables that could potentially influence the results. This ensures that any changes observed in the dependent variable can be attributed to the independent variable.

4. Design the experiment: Researchers design an experiment that allows them to manipulate the independent variable and measure the dependent variable. They may use control groups, randomization, and other techniques to minimize bias and ensure reliable results.

5. Collect and analyze data: Researchers collect data by conducting the experiment and measuring the dependent variable. They then analyze the data using statistical techniques to determine if there is a significant difference between groups or conditions.

By controlling variables in an experimental investigation, researchers can draw valid conclusions about the relationship between the independent and dependent variables. Thus, the correct answer is experimental investigations.

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Answer:

discuss the successes and the short comings of the conservative reaction to the french rvolution as seen in the actions of the congress of vienna and the holy aliance?

I2 (s) has very low solubility in H2O (l) because the weak dipole-induced dipole forces between I2 and H2O are not strong enough to replace the hydrogen bonds between the H2O molecules.

Dipole interactions are susceptible interactions that get up from the close association of permanent or precipitated dipoles. Collectively these forces are called Van der Waals interactions. Proteins incorporate a massive number of these interactions, which vary substantially in energy.

Solubility depends on the solvent's capacity to overcome the intermolecular forces in a solid. Red blood cells have an excessive concentration of dissolved ions. When positioned into pure water they rupture.

Polar species are soluble in water, whilst nonpolar species are soluble in oils and fats. Covalent solubility uses the like dissolves like a rule. This means that materials with an equal form of polarity might be soluble in one another. moreover, compounds with differing polarities might be insoluble in one another.

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Answer:

10.6 g CO₂

Explanation:

You have not been given a limiting reagent. Therefore, to find the maximum amount of CO₂, you need to convert the masses of both reactants to CO₂. The smaller amount of CO₂ produced will be the accurate amount. This is because that amount is all the corresponding reactant can produce before it runs out.

To find the mass of CO₂, you need to (1) convert grams C₂H₂/O₂ to moles (via molar mass), then (2) convert moles C₂H₂/O₂ to moles CO₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles CO₂ to grams (via molar mass). *I had to guess the chemical reaction because the reaction coefficients are necessary in calculating the mass of CO₂.*

C₂H₂ + O₂ ----> 2 CO₂ + H₂

9.31 g C₂H₂            1 mole               2 moles CO₂          44.0095 g
------------------  x  -------------------  x  ----------------------  x  -------------------  =
                            26.0373 g           1 mole C₂H₂              1 mole

=  31.5 g CO₂

3.8 g O₂             1 mole               2 moles CO₂          44.0095 g
-------------  x  --------------------  x  ----------------------  x  --------------------  =
                       31.9988 g              1 mole O₂                 1 mole

=  10.6 g CO₂

10.6 g CO₂ is the maximum amount of CO₂ that can be produced. In other words, the entire 3.8 g O₂ will be used up in the reaction before all of the 9.31 g C₂H₂ will be used.

The Partial pressure of Xe and Ne will be 4.95 atm and 1.55 atm. The number of moles of Xe and Ne will be 3.13 and 0.981

Computation of partial pressure and number of moles:

Let the total pressure of the vessel= 6.5 atm and mole fraction of Xenon= 0.761

As we know,

[tex]\chi_{Ne} + \chi_{Xe} = 1\\\chi_{Ne}= 1- 0.761\\\chi_{Ne}= 0.239[/tex]

According to Dalton's Law of partial pressure-

[tex]P_i=\chi_i\times P_{total}[/tex]

Where,

[tex]P_i=[/tex]The pressure of the gas component in the mixture

[tex]\chi_i=[/tex] Mole fraction of that gas component

[tex]P_t=[/tex] The total pressure of the mixture

[tex]P_{Xe}=(0.761)\times(6.5)\\P_{Xe}= 4.95 atm\\\\\\P_{Ne}=(0.239)\imes (6.5)\\P_{Ne}= 1.55 atm[/tex]

Calculation:

To calculate the number of moles,

PV=nRT

[tex]n=\frac{PV}{RT}[/tex]

[tex]n_{Xe}= \frac{4.95\times 15.75}{0.0821\times303 }\\ n_{Xe}= \frac{77.96}{24.87} \\n_{Xe}= 3.13\,mole \\\\\\n_{Ne}= \frac{1.55\times 15.75}{0.0821\times303 }\\\\n_{Ne}=\frac{24.41}{24.87}\\ n_{Ne}=0.981 \,mole[/tex]

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Answer:

Explanation:

In order to balance equations, simply alter coefficients until all elements are equal on both sides of the reaction symbol ”—>”:

1HBr + 1KOH —> 1KBr + 1H2O

The reaction is already balanced

3HF + Fe(OH)3 —> FeF3 + 3H2O

To match the 3 Flluorines on the right hand side, add 3 to HF and then add 3 to H2O to compensate for the increase in hydrogens.

2HCl + Ca(OH)2 —> CaCl2 + 2H2O

The Chlorine must be balanced, and then hydrogen must be balanced.

Hope this helps! If it did, I would appreciate if you provided brainliest!

The molar mass of the acid, given the data is 625 g/mole

This is a point is a titration reaction where the amount of the acid added is enough to neutralize the base

This simply implies that the number of mole of the acid used is equal to the number of mole of the base.

Mole = molarity × volume

Mole of base (NaOH) = 0.1 × 0.02

Mole of base (NaOH) = 0.002 mole

Molar mass = mass / mole

Molar mass of acid = 1.25 / 0.002

Molar mass of acid = 625 g/mole

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This refers to the material that is made when different substances mix up physically and causes a reaction.

You can make on the project of Mixture -

This refers to the chemical bond that holds different atoms tightly

You can make on the project of Compound -

Based on the fact that the atom is the smallest indivisible part of an element, elements like phosphorous cannot be further broken down.

You can make on the project of Elements -

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There are 44 grams of carbon contained in one mole of C3H8. Details about mass can be found below.

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

According to this question, one mole of propane (C3H8) was given.

Molar mass of C3H8 = 12(3) + 1(8) = 44g/mol

Mass of C3H8 = 44g/mol × 1 = 44g

Therefore, there are 44 grams of carbon contained in one mole of C3H8.

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Answer:

450 L

Explanation:

Because you are dealing with pressure and volume, you want to use Boyle's Law to find your missing value. The equation looks like this:

P₁V₁ = P₂V₂

In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and temperature. To find the final volume, you can plug the given values into the equation and simplify.

P₁ = 150 pKa             P₂ = 250 pKa

V₁ = 750 L                 V₂ = ? L

P₁V₁ = P₂V₂                                         <----- Boyle's Law equation

(150 pKa)(750 L) = (250 pKa)V₂        <----- Insert variables

112500 = (250 pKa)V₂                       <----- Multiply 150 and 750

450 L = V₂                                         <----- Divide both sides by 250

Answer:

refining petroleum, treating metals, producing fertilizer, and processing foods.

Answer:

1.49X10^20

Explanation:

hope this helps (´･ω･`)

Answer:

K2CO3 = K2O + CO2

Explanation:

In a chemical equation, the number of atoms on the left needs to be balanced with the number of atoms on the right, and there has to be the same number of the same *type* of atom on both sides as well.
On the left:
2 K
1 C
3 O
and on the right,
2 K
1 O

On the right, there are a few atoms missing, specifically, 1 C and 2 O.
The missing atoms then should be added to the side missing the atoms, preferably in a stable molecule. Luckily, CO2 contains exactly 1 C, and 2 O s, and is quite stable. So, a "CO2" has to be added on the left

The mass of the hydrogen is obtained as 0.302 g.

A hydrocarbon is a compound that contains only carbon an hydrogen. The amount of the carbon and the hydrogen can be found by combustion.

The mass of hydrogen can be obtained as follows;

Number of moles of hydrogen =2.7 g/18 g/mol * 2 = 0.302 moles

Now the mass of hydrogen is obtained from;

0.302 moles * 1 g/mol = 0.302 g

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The concentration of sodium chloride in units of weight/volume percent is 3.93g/ml

Given that

3.93 (w/v) NaCl

Weight NaCl = 3.14g

Volume of water = 79.9mL

W/V is usually represented in g/mL, so no need to change anything

3.14g/79.9mL *100 = 3.93 g/mL (%)

One mole of NaCl contains 6.022 x 10 23 NaCl formula units.

• Use the mole quantity to count formulas by weighing them.

• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023

• The mass of an atom in amu is numerically the same

as the mass of one mole of atoms of the element in grams.

• One atom of sulfur has a mass of 32.07 amu;

one mole of S atoms has a mass of 32.07 g.

Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g

Mass of 1 mole of H atoms:

1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g

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This chapter deals with chemical equilibrium, or how far chemical reactions proceed. Some reactions convert reactants to products with near 100% efficiency but others do not.

Chemical equilibrium is a dynamic process and occurs when the rates of two opposing processes (reactions) become the same. Unless conditions are somehow changed, the concentrations of both reactants and products remain constant after equilibrium is achieved.

Consider the decomposition reaction in which N2O4 (g) ' 2 NO2(g) What happens to the concentration of each, based upon the rate equations, as the reaction proceeds

Assuming reversible elementary processes, Rate (forward) = k (forward) x [N2O4]  and rate (reverse) = k (reverse) x [NO2]2As [N2O4] decreases, rate forward decreases, and, as [NO2] increases, rate reverse increases, but more quickly.

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Sound can travel through solid, liquid, and gaseous materials, whereas S-Waves can travel only through solid materials.

Sound is a form of energy. Sound moves through matter that is solid, liquid, and gas. In a vacuum sound cannot travel. In solids sound can travel more quickly as compared to liquid and gases because in solids molecules are closer together.

S-Waves are shear waves. These are the waves of high frequency and short wavelength. S- Waves can travel only through solid materials.

Thus from the above conclusion we can say that Sound can travel through solid, liquid, and gaseous materials, whereas S-Waves can travel only through solid materials.

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Zero error occur in every reading means that the measuring instrument needs to recalibrated and adjusted.

This error occurs when a measuring instrument reflects a digit which isn't zero despite the real value being zero.

When this occurs, only the zero screw on the device should be adjusted so as to correct this technical error. This is why recalibration should be the most appropriate solution.

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