How many π electrons are there in adenine? State which atoms contribute one electron to the π MOs and which atoms contribute two electrons?

Answer: similar: Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams. Different:Protons are a type of subatomic particle with a positive charge. And  Neutrons are a type of subatomic particle with no charge (they're neutral).

Explanation:

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Answer:

similarity:Protons and neutrons have about the same mass

Difference protons have a positive charge while neutrons have no charge

Explanation:

Double replacement :

2Na₃PO₄+3CaCl₂⇒6NaCl + Ca₃(PO₄)₂

1. A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

2. Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

3. Combination/syntesis : 2 or more reactants combine to form a new compound

4. Decomposition : the reactant is decomposed into 2/more products

If we look at the reaction options available, all of them can be included in the double replacement reaction, but we only choose the reaction from Sodium phosphate and Calcium chloride which leads to options: C because it is balanced (from the number of atoms in the same reactant and product) and is in accordance with the chemical formula of each compound (both products and reactants)

Answer:

Ammonia is moderately a base

The mass m of a single molecule in the gas is 32.19 g

The root square mean  (R.M.S) velocity V of the molecules of a really perfect fuel is given with the aid of the expression, v=sqrt(3RTM) and v=sqrt(3KTm) where R is universal gas consistent, T is absolutely the (Kelvin) temperature, m is the molar mass, okay is Boltzmann's consistent and M is the molecular mass.

The basis-mean-square speed is utilized in fuel, for the measure of the speed of debris, mentioned as the square root of the common speed-squared of the molecules in a gas. it's far represented with the aid of the equation:

Calculation:-

vrms=√3RT/M,

M = √3RT/vrms

   = 1.732 × (8.314) ×418 / 187

  = 32.19 g

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Answer:

i have been doing research and i think its the style. if not its the pollen tube.

Explanation:

Hope i helped!

Answer:

stigma

Explanation:

Answer:

the fuel efficiency in kilometers per liter is 16.561 kilometer per liter

Explanation:

The computation of the full efficiency in kilometers per liter is shown below:

39.0 miles ÷ gallon = (39.0 miles ÷ gallon) × (1.6094 km ÷ 1 miles)  × (1 gallon ÷ 3.79 L)

Now cut the opposite miles and gallons

So, the fuel efficiency would be

= 16.561 kilometers per liter

Hence, the fuel efficiency in kilometers per liter is 16.561 kilometer per liter

Answer:

OZONE...............

Answer: The process should produce a high volume of product from the input reactants. The process must also be safe for people and the enviorment. - Ape x

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore,  the process must also be safe for people and the environment.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The process should produce a high volume of product from the input reactants. The process must also be safe for people and the environment.

Therefore,  the process must also be safe for people and the environment.

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Answer:

Single displacement reaction.

Explanation:

Hello!!

In this case, since the reaction between silver nitrate and copper metal is:

[tex]2AgNO_3(aq)+Cu(s)\rightarrow 2Ag(s)+Cu(NO_3)_2(aq)[/tex]

As silver was forming silver nitrate, due to the presence of copper, which has the capacity to displace silver out of the salt, we notice the formation of solid silver and a resulting copper (II) nitrate which is blue in aqueous solution.

Therefore, this is a single displacement reaction, because the the lonely copper displaced the silver.

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Answer:

Minimizes heat transfer

Explanation:

To keep my lunch from getting cold at the beach, a material the minimizes heat transfer will be the most desirable.

Answer:

Convection currents are caused by a temperature difference in gases and liquids. As one area becomes warmer than another the molecules have more energy and start vibrating more vigorously thus spreading out and becoming less dense. This means that the less dense parts will become more buoyant causing them to rise.

Explanation:

Answer:

Convection currents are caused by a temperature difference in gases and liquids.  

Explanation:

As one area becomes warmer than another the molecules have more energy and start vibrating more vigorously thus spreading out and becoming less dense. This means that the less dense parts will become more buoyant causing them to rise.

Answer:

Explanation:

Zinc chloride, ZnCl2, can be prepared by a direct reaction or by evaporating the aqueous solution formed in various reactions. It is strongly deliquescent (water-absorbing) and is utilized as a drying agent and as a flux.4

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Answer:

5.6667*10^-3mol\L

Explanation:

get the number of moles:

0.0232\(40+32+16+16+16+16)=1.7*10^-3

get the consentration:

1.7*10^-3 \0.3=5.6667*10^-3mol\L

Answer:

h2so4

Explanation:

im big brain.

Answer:

APT is made of a nitrogen base (adenine), a ribose sugar, and three phosphate groups.

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Answer:

The energy released from each molecule of glucose is used to attach a phosphate to each of four molecules of adenosine diphosphate (ADP) to produce two molecules of adenosine triphosphate (ATP) and an additional molecule of NADH.

Explanation:

Answer:

19g

Explanation:

Given:

  Number of molecules  = 1.505 x 10²³molecules

 Formula of compound  = CS₂

Unknown:

Mass of the compound

Solution:

 A mole of every substance contains 6.02 x 10²³molecules. Using this we can find the number of moles from number of molecules given;

    6.02 x 10²³molecules makes up 1 mole of a substance

     1.505 x 10²³molecules will contain [tex]\frac{1.505 x 10^{23} }{6.02 x 10^{23} }[/tex]   = 0.25mole of CS₂  

Mass of CS₂  = number of moles x molar mass

 Molar mass of CS₂  = 12 + 2(32) = 76g/mol

 Mass of CS₂  = 0.25 x 76 = 19g

Answer:

29 mL HCl

General Formulas and Concepts:

Chem

Explanation:

Step 1: Define

6.2 M HCl

0.18 mol HCl

x L mol HCl

Step 2: Define conversions

1 L = 1000 mL

Step 3: Find L

6.2 M HCl = 0.18 mol HCl / x L HCl

(x L HCl)(6.2 M HCl) = 0.18 mol HCl

x L HCl = 0.18 mol HCl / 6.2 M HCl

x = 0.029032 L HCl

Step 4: Convert

[tex]0.029032 \ L \ HCl(\frac{1000 \ mL \ HCl}{1 \ L \ HCl} )[/tex] = 29.0323 mL HCl

Step 5: Check

We are given 2 sig figs. Follow sig fig rules.

29.0323 mL HCl ≈ 29 mL HCl

Answer:

29 mL HCl

Explanation:

Answer:

Partial pressure of neon = 175 mmHg

Partial pressure of xenon = 564 mmHg

Explanation:

The partial pressure of a gas in a mixture can be calculated as the product of the mole fraction of the gas (Xi) and the total pressure (Pt), as follows:

Pi = Xi Pt

The total pressure is 739 mmHg ⇒ Pt =  739 mmHg

In order to calculate the mole fraction of each gas, we have to first calculate the number of moles of each gas (n) by dividing the mass of the gas into the molar mass (MM):

For neon gas (Ne):

MM(Ne) = 20.18 g/mol

n(Ne)= mass/MM = 0.919 g x 1 mol/20.18 g = 0.045 mol Ne

For xenon gas (Xe):

MM(Xe) = 131.3 g/mol

n(Xe)= mass/MM = 19.1 g x 1 mol/131.3 g = 0.145 mol Xe

Now, we calculate the mole fraction (X) by dividing the number of moles of the gas into the total number of moles (nt):

nt= moles Ne + moles Xe = 0.045 mol + 0.145 mol = 0.190 mol

X(Ne) = moles Ne/nt = 0.045 mol/0.190 mol = 0.237

X(Xe) = moles Xe/nt = 0.145/0.190 mol = 0.763

Finally, we calculate the partial pressures of Ne and Xe as follows:

P(Ne) = X(Ne) x Pt = 0.237 x 739 mmHg = 175 mmHg

P(Xe) = X(Xe) x Pt = 0.763 x 739 mmHg = 564 mmHg

Answer:

28869.6J

Explanation:

Given parameters:

Mass of water in flask = 100g

Initial temperature   = 21°C

Final temperature  = 90°C

Specific heat capacity  = 4.184J/g°C

Unknown:

Amount of heat the water absorbed  = ?

Solution:

The amount f heat the water absorbed can be determined using the expression below:

 H  = m x C x Δt

m is the mass

C is the specific heat capacity of water

Δt is the change in temperature

Now insert the parameters and solve;

    H = 100 x 4.184 x (90 - 21)  = 28869.6J

Answer:

So its c

Explanation:

Answer:

the contrasting sides of human nature

Explanation:

I took the test

Answer:

0.0023 cm

Explanation:

The following data were obtained from the question:

Length (L) = 55 cm

Breadth (B) = 23.3 cm

Volume (V) = 2.9 cm³

Thickness (T) =?

Thus, we can obtain the thickness of the aluminum foil as illustrated below:

V = L × B × T

2.9 = 55 × 23.3 × T

2.9 = 1281.5 × T

Divide both side by 1281.5

T = 2.9/1281.5

T = 0.0023 cm

Therefore, the thickness of the aluminum foil is 0.0023 cm

Answer:

66.7%

Explanation:

The reaction for the titration of the excess ferrous ion is:

We calculate the moles of Fe⁺² from the used moles of KMnO₄:

Then we substract those 0.30 mmol from the original amount used:

The reaction between ferrous ammonium sulfate and MnO₂ is:

So we convert those 3.5 mmol Fe⁺² that were used in this reaction to MnO₂ moles:

Then we convert MnO₂ to Mn₃O₄, using the reaction:

Finally we convert Mn₃O₄ moles to grams:

And calculate the percent

Answer:

specific heat = .897 J /g°C

Explanation:

Quantity of heat added = mass x specific heat x rise in temperature

3610 = 77.3 x specific heat x 52.1

specific heat = .897 J /g°C

Unknown metal is Aluminium .

Answer:

Metallic bonding is found in metals and their alloys. When the atoms give up their valence electrons, they form ions. These ions are held together by the electron cloud surrounding them. Metals are shiny because they have a lot of free (i.e. delocalized) electrons that form a cloud of highly mobile negatively charged electrons on and beneath the smooth metal surface in the ideal case. ... In the absence of any external EM field, the charges in the plasma are uniformly distributed within the metal.

Explanation:

In metallic bonding, the electrons are “surrendered” to a common pool and become shared by all the atoms in the solid metal.

Answer:

Yes,  a fan not spinning has energy

Explanation:

Let us remember that energy is neither created nor destroyed but is transformed from one form to another. This is known as the principle of energy conservation. Hence energy in the universe never disappears!

The fan that is not spinning has potential energy. Potential energy is energy possessed by a body by virtue of its position. When the fan starts spinning, this potential energy is converted to kinetic energy.

The correct matches are:

a. 3. Galvanic cell.

b. 1. Cathode.

c. 2. Anode.

d. 5. Electrolytic cell.

e. 4. Half reaction.

Electrochemistry is the study of chemical reactions in which movement of electron happen.

An electrolytic cell is the cell in oxidation and reduction occurs.

It's all about how electrical energy interacts with chemical transformation.

For example, is concerned with the study of electrochemical cells. It is concerned with cells that convert chemical to electrical energy.

Thus, the correct matches are a. 3. Galvanic cell.

b. 1. Cathode.

c. 2. Anode.

d. 5. Electrolytic cell.

e. 4. Half reaction.

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Answer:

NaClO; the contained elements ae Na, Cl, O.

Answer:

V = 27.98 L

Explanation:

Given data:

Mass of CO₂ = 33.0 g

Pressure = 500 torr

Temperature = 27°C

Volume occupied = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 33.0 g/ 44 g/mol

Number of moles = 0.75 mol

Volume of CO₂:

PV = nRT

R = general gas constant = 0.0821 atm.L/ mol.K  

Now we will convert the temperature.

27+273 = 300 K

Pressure = 500 /760 = 0.66 atm

By putting values,

0.66 atm×V = 0.75 mol × 0.0821 atm.L/ mol.K  × 300 K

V = 18.47 atm.L/0.66 atm

V = 27.98 L

The volume that will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C is 28.11L.

The volume of an ideal gas can be calculated using the ideal gas law equation as follows:

PV = nRT

Where;

According to this question;

0.657 × V = 0.75 × 0.0821 × 300

0.657V = 18.4725

V = 18.4725 ÷ 0.657

V = 28.11L

Therefore, the volume that will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C is 28.11L.

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Answer:

Examples of ROS include peroxides, superoxide, hydroxyl radical, singlet oxygen, and alpha-oxygen.