A beam of radiation has an energy of 2.57×102 kJ/mol. What is the wavelength of this light?

The number of protons, neutrons, and electrons that iron (Fe) have if it has a +4 charge are 26, 29 and 22 respectively.

Atomic number of an element is the number of protons in the atom of that element. The number of protons of a neutral atom i.e. charge 0 is equal to the number of electrons.

Iron is a metallic chemical element having atomic number 26 and symbol Fe. Since the atomic number is 26, the number of protons is 26.

If the charge of the iron is +4, this means that the number of protons will be 26 while the number of electrons will be 22. The number of protons will be 55 - 26 = 29.

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Balanced chemical equation:

[tex]3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ----- > 6 KNO3 (aq) + Ba3(PO4)2(s)[/tex]

What is double-displacement reaction?

In an aqueous solution, a double-displacement reaction takes place when the positive and negative ions of two ionic compounds exchange positions to form two completely different compounds.

Chemical formula for :

Barium nitrate---> Ba(NO3)2  (aq)

Pottasium Phosphate = K3PO4 (aq)

Reaction between these two is a type of double displacement type reaction in which ions are exchanged , forming

Pottasium Nitrate -----> KNO3 (aq)

Barium Phosphate -----> Ba3(PO4)2 (s)

(aq) means the phase is aqueous and (s) means phase is solid or the compound precipitated out .

Now, writing the molecular formula using the above data , we get:

[tex]Ba(NO3)2 (aq) + K3PO4 (aq) ------ > KNO3 (aq) + Ba3(PO4)2 (s)[/tex]

A equation is called balanced when number of chemical species are same on both sides of the equation .

Here, in product side there are 3 Ba and 2 (PO4) and only 1 Ba and 1 PO4 in reactant side to balance this let's multiply

2 with K3PO4 on reactant side and ,

3 with Ba(NO3)2 on reactant side

The equation thus becomes:

[tex]3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ------ > KNO3 (aq) + Ba3(PO4)2 (s)[/tex]

Now,

There are 6 K atoms on reactant side to balance this let's multiply 6 with KNO3 in product side by doing so we also balanced NO3.

Consequently, the balanced chemical equation is

3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ----- > 6 KNO3 (aq)  + Ba3(PO4)2(s)

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Orbits of electrons, -quantum energy emissions  and  -relationship between outer shell and chemical properties.

electron is a subatomic particle with a charge of sub-atomic electricity found in all atom and is the primary carrier of electricity in solid.

Neil Bohr was the first who explained that electrons moves around the nucleus in the separate orbits or shells in an atom. The properties of an element is determined by the number of electrons in outer shell. He also discovered that electrons can only be in a particular orbits of fixed energy and when electrons allowed to jump from one orbit to another, they absorbed or emitted electromagnetic radiation.

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Complete Question
Select all that apply. The discoveries of Niels Bohr were:

- orbits of electrons

-charge on the electron

- quantum energy emissions

- static electricity

- relationship between outer shell and chemical properties

What happens during a fission reaction is that matter is converted to energy.

We define the term fission as the kind of reaction that involves the breaking of the nucleus of an atom and then there would be a release of energy. There are various kinds of nuclear reactions that we have but the most common types of nuclear reactions are the fission and the fusion reaction.

In the fusion reaction we have the combination of two or more lighter nucleus so as to produce a heavier nucleus while in the case of the fission reaction the nucleus would have to be  broken up so that energy can be released in the process.

Thus, we see that the total mass on the left hand side may not be the same as the total mass on the left hand side because some of the mas is converted to energy.

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Missing parts;

Which change occurs during a nuclear fission reaction?

(1) Covalent bonds are converted to ionic bonds.

(2) Isotopes are converted to isomers.

(3) Temperature is converted to mass.

(4) Matter is converted to energy

Gel -electrophoresis is used to separate mixture of proteins, and other organic compounds based on their charge, size or shape but not by color.

Gel electrophoresis is used to separate combinations of DNA, RNA, or proteins based on their molecular sizes. In gel electrophoresis, the molecules that need to be separated are forced through a gel that has tiny pores by an electrical field.

The speed at which the molecules move through the pores in the gel is inversely proportional to their size. This indicates that a smaller molecule will move through the gel further than a larger the molecule.

However, gel electrophoresis  does not involve a separation based on the color of the compounds. Thus, option a is correct.

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According to the Gay-Lussac's law, as the container is heated that is as temperature increases pressure also increases as they are directly proportional to each other.

Gay-Lussac's law is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.

The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .The nature of  graph of pressure versus temperature is linear.

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Problem #8: A 5.00 L flask contains 3.00 g of mercury. The system is at room temperature of 25.0 °C. By how many degrees should we increase the temperature of the flask to triple the mercury vapor pressure. The enthalpy of vaporization for mercury is 59.11 kJ/mol?

Solution:

1) Let us use the Clausius-Clapeyron Equation:

with the following values:

P1 = 1    T1 = 298 K

P2 = 3    T2 = x

3) Set up equation with values:

ln (3/1) = (59110 / 8.31447) (1/298 minus 1/x)

1.0968 = 7109.2926 (1/298 minus 1/x)

1.0968 = 23.8567 minus 7109.2926/x)

x = 312.4 K = 39.4 °C

If a drop of carbonated water were placed on blue litmus paper, the color of the litmus paper will turn red.

Carbonated water is water that contains dissolved carbon dioxide gas, which may have been added to the water intentionally under pressure or may have occurred naturally as a result of geological processes. Carbonation creates tiny bubbles that make water effervescent. Club soda, sparkling natural water, and sparkling water created commercially are examples of soda water.

As soda water is an acidic solution, the blue litmus paper changes to a red color. This is because the carbonation process, in which CO₂ is bubbled into the water, results in the formation of carbonic acid, which then interacts with litmus paper.

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Answer:

Explanation:

About 3.5% of the weight of seawater is made up of dissolved salts because of the salinity, or salt concentration, of saltwater, which is 35 parts per thousand.

_________________

Hope this helps!

Have a great day!

Answer:

the Caribbean

Explanation:

The statement "Both the samples contain same number of atoms" is False.

The statement "both samples have the same mass in grams" is False.

The statement "both samples contain 6.022 x 1023 atoms " is False.

The statement "both samples contain 6.022 x 1023 particles (molecules or atoms)" is True.

The statement "the sample of 1.0 mole of cl2 weighs more than the sample of 1.0 mole of Ca" is True.

The number of atoms in both the case are :

Ca : 1 mole : 6.022 * 10^23 atoms

Cl2 : 1 mole : 2 * 6.022 * 10^23 atoms : 12.044 * 10^23 atoms

Weight of 1 mole of Cl2 : 70 g

Weight of 1 mole of Ca : 40 g

These Values are enough to justify the above True/False Statements.

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The importance of the use of hydrates in fire extinguishers are;

-They keep fire extinguishers dry during shipping and storage.

-They create foams that have high water content to help extinguish fires.

They create high pressure in the cylinder to quickly force out the fire r*tardant.

We know that a fire extinguisher has to do with any device that has been made in such a way that the device can be used to eliminate a flame that is burning. We all know that fore can be very destructive. This implies that it is important to be able to put out the fire so that it does not cause big problems.

The fire extinguisher is composed of certain chemical substances that are able to react together quickly and then be able to quench the flame of the reaction that is going on in the system.

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The products formed by this reaction are aluminium chloride and hydrogen gas is liberated.

Why is it necessary to balance a chemical equation?

Lets take the example of combustion of methange gas:

CH4 + O2 -----> CO2+ H2O

You can see that on the reactant side (left side) of the equation, there is one carbon atom, four hydrogen atoms, and two oxygen atoms if you count the number of atoms (subscripts) of carbon, hydrogen, and oxygen on both sides of the equation.

One carbon atom, two hydrogen atoms, and three oxygen atoms can be found on the product side (right side). As a result, the equation is unbalanced and does not comply with the rule of conservation of mass.

In order to balance the equation, we must adjust the amounts of the reactants and products, as necessary, by inserting coefficients in front of the appropriate formula(s).

CH4 + 2O2 -----> CO2+ 2H2O

When aluminium is reacted with hydrochloric acid, it gives aqueous solution of aluminium chloride and liberation of hydrogen gas is seen.

2Al(s) + 6HCl(aq)--------> 2AlCl3 (aq)+ 3H2(g).

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Answer: white light

Explanation:

because complementary colors... but dont expect the same thing to work with paint. obviously

On the pH scale, the pH range for an acid is 0–7 and the pH range for a base is 7–14. pH 7 refers to a neutral solution. pH-7 pure water is a substance considered neutral.

This substance, which consists of a water molecule with a proton (H+) added, is an ion because it has a charge. It is known as the hydronium ion and has the formula H3O+. When an acid dissolves in water, the hydronium ion is always produced. Always interacting with the nearby water molecule to generate H3O+, the acid's H+.

For the detection of trace gases in the air, chemical ionization using proton-transfer reactions with hydronium ions (H3O+) is frequently used.

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The theoretical yield of Cu, in grams, would be 6.34 grams.

The theoretical yield of a reaction is the yield of the reaction calculated based on the balanced equation of the reaction.

From the balanced equation of the reaction below:

[tex]2Fe(s) + 3Cu^{2+}(aq) --- > 2Fe^{3+} (aq) + 3Cu (s)[/tex]

The mole ratio of the iron that reacts and the copper that is produced is 2:3.

Recall that: mole = mass/molar mass

3.71 g of iron would be: 3.71/56 = 0.066 mol

The equivalent mole of copper that is produced would be; 3/2 x 0.066 = 0.099 mol.

Since, mass = mole x molar mass, the mass of 0.099 mol of copper would be: 0.099 x 64 = 6.34 grams

In other words, the theoretical yield of solid copper [Cu(s)] in grams is 6.34 grams.

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Answer:

this is ez 123

Explanation:

A double replacement reaction occurs when pieces of two ionic compounds switch places to form two new compounds.

A double displacement reaction is one in which one reactant is partially replaced by another.

Following is a description of double displacement reactions:

AD = AB + BC + CD

The ions in two reactant ionic compounds are switched out for the same ions in two new product compounds during a double replacement process.

A double replacement reaction occurs when two reactants switch cations or anions to create two new products.

Other names for double replacement processes include metathesis reactions and double displacement reactions.

Precipitation, gas generation, and neutralization are examples of double replacement reactions.

So, A double replacement reaction happens when bits of two ionic compounds switch places to create two new compounds.

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Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 2,19,789.6calorie are in a candy bar containing 919,600 J of energy.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

1 calorie= 4.184Joule

1 joule = (1/ 4.184)calorie

919,600 J will have energy

919,600× (1/ 4.184)

=919,600/4.184

=2,19,789.6calorie

Therefore, 2,19,789.6calorie are in a candy bar containing 919,600 J of energy.

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Answer:219.8

Explanation:

A colorimeter is a device used to gauge how much heat a solution has absorbed. The concentration of the solute in the solution is inversely correlated with this absorbance.

What is a calorimeter?

A calorimeter is a tool used in calorimetry, a technique for calculating heat capacity and measuring the heat of chemical processes or other physical changes. Among the most popular kinds are differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters, and accelerated rate calorimeters.

One at a time, two chemicals A and B are placed in a calorimeter, and the temperatures before and after the reaction are recorded. The enthalpy change per mole of substance A in the process is calculated using these data. The mass and specific heat capacity of the components can be multiplied by the temperature change to provide an estimate of the amount of energy produced or absorbed during the reaction. The enthalpy change of the reaction is calculated by dividing the energy change by the quantity of A that was present.

One at a time, two chemicals A and B are placed in a calorimeter, and the temperatures before and after the reaction are recorded. The enthalpy change per mole of substance A in the process is calculated using these data. The mass and specific heat capacity of the components can be multiplied by the temperature change to provide an estimate of the amount of energy produced or absorbed during the reaction. The enthalpy change of the reaction is calculated by dividing the energy change by the quantity of A that was present.

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It is discovered that an unidentified metal crystallizes in a body-centered cubic lattice and has a density of 7.8748 g/cm3. The unit cell's edge measures 0.28664 nm.

A body-centered cubic unit cell with an edge length of 287 pm forms during the crystallization of iron metal. 287 p m . Iron has a molar mass of 55.85 gmol (1.85 gmol) and a density of 7.86 gcm (3.86 g c m)

Consequently, the formula for obtaining 7.97 g of iodine is: = 789.4 g x 7.97 g / 761.4 of NI3 = 6291.518 / 761.4 of NI3 = 8.26 g of NI3 Hence Grams.

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The above assertion claims that the emperical formula for enargite is Cu3AsS4.

The simple whole number proportion of atoms in a compound is the empirical formulae of a chemical in chemistry. No information on the arrangement or quantity of atoms is provided in an empirical formula.

If we use 100 grams of enargite:

n(Cu) = 48,41 g ÷ 63.55 g/mol.

n(Cu) = 0.761 mol.

n(As) = 19.02 g ÷ 74.92 g/mol.

n(As) = 0.254 mol.

n(S) = 32.57 g ÷ 32.065 g/mol.

n(S) = 1.016 mol.

n(Cu) : n(As) : n(S) = 0.761 mol : 0.254 mol : 1.016 mol / 0.254.

n(Cu) : n(As) : n(S) = 3 mol : 1 mol : 4 mol.

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The least energetic electrons are those in energy level I, also known as energy level K.Higher level electrons have more energy as you move away from the nucleus, and this energy increase is fixed and discrete.

Sharp, Principle, Diffuse, and F are the four you need to be aware of (fine or fundamental).So, s, p, d, & f.Only that many sublevels are contained in the Principal Energy Level (the number).

A 1s sublevel, which has a single orbital, is always the sublevel with the lowest energy.In its ground state, the hydrogen atom's lone electron will be located in the 1s orbital.As we move on to atoms containing multiple electrons, those additional electrons are added to the subsequent lowest sublevel, such as 2s, 2p, 3s, and so forth.

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What is common about the forces B and C is that both have short range.. Option A

We know that the fundamental forces are known to be the forces that are able to operate in the universe. These are the four forces that are able to hold the universe in place as we can see the universe today.

The arrangement of these four fundamental forces  in the increasing order of their relative strength is;

Having looked at these forces it is clear that the order of the increase of the strengths of the forces is from top to the bottom of the list a shown above here.

Thus the B and C talk about the weak and the strong nuclear forces and these are both short range forces as we know above.

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Answer: nose

Explanation:sorry

Combination reaction of Carbon and Oxygen:

Carbon dioxide is created when carbon and oxygen react as follows:

C + O₂ → CO₂            (1)

The reactants, carbon (C) and oxygen (O), are on the left side of reaction (1) above. This process solely produces carbon dioxide (CO2) as a result of this reaction (on the right side of the reaction).

A direct combination reaction is one in which two or more substances (reactants) combine to create a single substance. It is sometimes referred to as a synthesis reaction (product). These processes are described by equations of form X + Y →XY (A+B→ AB). A combination reaction occurs when two or more components combine to form a single compound. In other terms, a combination reaction is a chemical reaction that occurs when two or more atoms or compounds react to create a single component.

Reactants are on left side of the arrow (tail)

Products are on right side of arrow (head).

Combination reaction of Carbon and Oxygen:

Carbon dioxide is created when carbon and oxygen react as follows:

C + O₂ → CO₂                (1)

The reactants, carbon (C) and oxygen (O), are on the left side of reaction (1) above. This process solely produces carbon dioxide (CO2) as a result of this reaction (on the right side of the reaction).

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Answer:

D.geothermal energy

Explanation:

The State of Nevada has abundant solar, wind, and biomass energy sources, but has more potential for geothermal energy production than any other state.

18.0121 grams of CH₃OH must be added to water to prepare 225ml of a solution that is 2.5 m CH₃OH.

Molarity of the solution is defined as the number moles of the solute present in one liter of the solution. Molarity is calculated from the equation,

M = No. of moles of solute / Volume of the solution in terms of liter.

Volume of solution given is 225 ml. As molarity is expressed in moles per liter.

Volume of solution = 0.225 L

Calculate the mole of CH₃OH by the expression of molarity,

225ml × 2.5 mole/1000 ml = 0.562 moles of CH₃OH .

Now convert 0.175 moles by multiplying molar mass of the solution. So,

0.562 moles × 32.05g of CH₃OH /1mole CH₃OH = 18.0121 grams

The volume equals to 18.0121 grams of CH₃OH.

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The energy required is 83,600 j/kg°C, for the given specific heat of the ice.

What is Specific heat?

The amount of heat needed to raise a substance's temperature by one degree Celsius in one gram is also known as specific heat. Typically, calories or joules per gram per degree Celsius are used as the units of specific heat. For instance, water has a specific heat of 1 calorie (or 4.186 joules) per gram per degree Celsius.

What is Energy?

The quantitative quality that is transferred to a physical system or a body is known as energy, and it is evident in the production of heat and light as well as in the performance of work. The law of conservation of energy asserts that although energy can change its form, it cannot be created or destroyed. Energy is a conserved quantity.

What are the calculations?

The total heat required will be the sum of heat energy needed to change the temperature of ice from –40°C to 0°C.  

q (total) = mc (ΔT)

             = 1 × 2090 × (0 + 40)

             =  2090 × 40

             = 83,600 j/kg°C

Hence, the energy required is 83,600 j/kg°C, for the given specific heat of the ice.

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Both energy and mass can enter or exit a closed system. The correct option to this question is D.

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