Parts of a neuron include:
A. dendrites.
B. hormones.
C. cortexes.
D. collosums.

Answer:

Explanation:

To write the Lewis structure, it is important to look for the electrons of each atom in the Periodic Table of Elements.

C has 4 valence atoms, H has 1 valence atom and Cl has 7 valence atoms.

We write the C atom in the center. Then we have to complete the Octet in each atom, except in Hydrogen, because it can only has 2 electrons bonded.

Answer:

Explanation:

Here, we want to calculate the mass of sodium chloride formed

Firstly, we need to get the number of moles of sodium that reacted

To get this, we divide the mass of sodium by its atomic mass

We have that as:

Now, let us get the number of moles of chlorine

From the equation of reaction, 1 mole of sodium produced 1 mole of sodium chloride

Thus, 0.5435 mole of sodium will also produce 0.5435 mole of sodium chloride

To get the mass of sodium chloride formed, we multiply the above number of moles by the molar mass of sodium chloride

The molar mass of sodium chloride is 58.44 g/mol

Thus, the mass of sodium chloride formed will be:

CO2 particles move faster through the solution. Gas solubility increases as liquid CO2 partial pressure rises.

Dynamic equilibrium occurs when the solution rate matches the escape rate, and neither the gas above the liquid nor the gas dissolved in it changes.

This is further explained below.

Generally, The idea of partial pressure is connected to the changes that occur in soft drink containers. Since there are no gas particles in the liquid when we add CO2 at a typical partial pressure of 0.00035, the CO2 gas begins to move into the solution at a faster pace than it can leave.

But when the concentration of CO2 gas rises, it begins to diffuse into the liquid, and eventually, a dynamic equilibrium is attained when the rate of the solution equals the rate of escape.

However, as we continue to add CO2 to this dynamic equilibrium, its partial pressure will rise until it reaches 4 atm, and this rise in partial pressure accelerates the rate of solution. Thus, raising the partial pressure of CO2 causes this reversible transformation to occur.

When the rate of the solution equals the rate of escape, this is known as dynamic equilibrium, and neither the quantity of gas above the liquid nor the amount of gas dissolved in it changes in any significant way.

Now here comes what role is played by partial pressure. When the rate of solution and the rate of escape reach a dynamic equilibrium and we begin to introduce additional CO2 gas to this dynamic equilibrium stage.

The CO2 gas particle's partial pressure and concentration both rise. Because of the increased rate of collision between the surface of CO2 gas and the surface of the liquid particles due to the increasing concentration, the rate of solution also rises. The pace of solution has now surpassed the rate of escape.

As a result, the rate at which CO2 gas particles travel through the solution increases. This is how a rise in CO2 partial pressure over liquid causes a rise in gas solubility.

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Answer:

Al 3+

Na+

Mg2+

F-

Explanation:

The element with the given electron that isn't an ion is Neon. It has 10 electrons in total.

Looking at the periodic table attached will help to see how the elements below are related to the one circled in red (Ne).

Al 3+ lacks 3 (because it has a 3+ charge) of its normal electrons so it has 10 and will have the same electron configuration as shown.

Na+ lacks one electron so it will also have 10 electrons instead of its normal 11.

Mg 2+ lacks two electrons so it will also have 10 total electrons.

F- has gained an extra electron so it now has 10 instead of 9.

Al3+, Na+, F-, and Mg2+ will have the given electronic configuration.

The electronic configuration given in the question is:

2p6, 2s2, 1s2

If it was a stable atom, the answer would have been Neon.

And if that would have been negative ion or anion (to be precise),

the answer would have been either F- or O2-.

But in the case of positive ions or we can say cations,

Al3+, Na+, and Mg2+ have the given electronic configurations.

Because the atom of Aluminum loses three electrons to achieve another state which is responsible for the formation of Al3+.

Similarly,

The atoms of Sodium and Magnesium also lose one and two electrons respectively to form Na+ and Mg2+.

So, we can conclude that Al3+, Na+, F- and Mg2+ will have the given electronic configuration.

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Answer:

18.82L of oxygen gas are needed.

Explanation:

1st) It is necessary to write and balance the chemical reaction:

2nd) From the balanced reaction, we can see that 3 moles of oxygen gas (O2) react with 4 moles of aluminum (Al). To convert moles to grams, it is necessary to use the molar mass of oxygen (32g/mol) and aluminum (27g/mol):

- O2 conversion:

- Al conversion:

Now we can see that 96g of O2 react with 108g of Al.

3rd) We have to calculate the grams of O2 that will react with 30.25g of Al:

Using the molar mass of oxygen, we know that 26.89g represent 0.84 moles of O2.

4th) Finally, a mole of a gas at STP conditions occupies a volume of 22.4L. With this number and the moles of oxygen gas, we can calculate the liters:

So, 18.82L of oxygen gas are needed.

Answer:

586.846 lbs

Explanation:

the molar mass of HCl is 1 + 35.45 = 36.45

this means you can do 16.1 lbmol * 36.45 lb/lbmol = 586.845

The reactants are the compounds before the arrow and the products are after the arrow. Just as they show us, the oxygen atoms in the reagents will bJust as the reaction shows, the oxygen atoms in the reactants will be:

Answer: There are 7 atoms of oxygen in the reactants

The energy change when the temperature of 0.950 kg of water decreased from 103 °C to 60.5 °C is 2308.87 kJ.

The heat energy change when the temperature of 0.950 kg of water decreased from 103 °C to 60.5 °C is determined from the formulas below:

Heat change 1 = Heat capacity as gas * moles * temperature change

Heat change 2 = Heat of vaporization, ΔHvap * moles

Heat change 3 = Heat capacity as liquid, Cp (l) * moles * temperature change

moles of water = 950 kg * 1000 g/kg * 1 mol/ 18g = 52.78 mole

Heat change 1 = 33.6 * 52.78 * (103 - 100) = 5320.224 J

Heat change 2 = 40.67 * 1000 * 52.78 = 2146562.6 J

Heat change 3 = 75.3 * 52.78 * (100 - 60.5) = 156986.193 J

Total heat change = 5320.224 J + 2146562.6 J + 156986.193 J

Total heat change = 2308869.017 J = 2308.87 kJ

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Explanation:

A mixture of differet iron oxides is heated and they it absorbs oxygen from the air to form iron (II) oxide. The reaction can be represented like this:

2 Fe₃O₄ + 2 FeO + O₂ ----> 4 Fe₂O₃

The mass of the mixture of Iron oxides is 3.939 g. The mass of Fe₂O₃ formed is greater than the original mass, it is 4.197 g. That means that the sample absorbed oxygen.

mass of Fe₃O₄ + mass of FeO = 3.939 g

mass of Fe₂O₃ = 4.197 g

The law of conservation of mass states that no mass is loss or created in a chemical reaction. A mass balance can be written:

mass of Fe₃O₄ + mass of FeO + mass of O₂ = mass of Fe₂O₃

The known values can be replaced in the equation, and it can be solved for mass of O₂ to obtain the answer to the problem.

mass of Fe₃O₄ + mass of FeO + mass of O₂ = mass of Fe₂O₃

mass of O₂ = mass of Fe₂O₃ - (mass of Fe₃O₄ + mass of FeO)

mass of O₂ = 4.197 g - 3.939 g

mass of O₂ = 0.258 g

Answer: the mass of oxygen reacted is 0.258 g

A mixture in Chemistry is defined as a material made up of two or more different chemical substances, and it will not present a homogeneous solution, but instead a heterogeneous appearance, just like a vegetable soup, which is a mixture of many substances, answer letter D

Answer:

5.546262 x 10^24 formula units

Explanation:

Use avogadro's number

9.21 mol CaO ((6.022 x 10^23 formula units CaO)/1 mol CaO)) = 5.546 x 10^24.

I rounded to 3 sig figs.

Answer:2ZnO(s)→2Zn(l)+O2(g)

Explanation:

Answer:

Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.

Explanation:

Answer:

I do not know how to answer this question. Is it even a question?

Explanation:

Explanation:

The reaction:

N2O4(g) <=> 2NO2(g)

Inicially 0 [1 mol/Volume]

Reacts +x -2x

Equilibrium +x [1 mol/Volume]-2x

[1 mol/Volume] means molarity

In a chemical reaction, chemical equilibrium is the state in which the forward reaction rate and the reverse reaction rate are equal. The result of this equilibrium is that the concentrations of the reactants and the products do not change.

Therefore, the answer: Some N2O4 and some NO2

Answer:

The Arrhenius acids in the list are:

HCl, HBr , H2SO4 , H3PO4 , HNO3 , HF

The Arrhenius bases are:

NaOH , NH4OH , LiOH , Ba(OH)2 , CsOH and KOH

Explanation:

An Arrhenius acid increases the concentration of H+ ions while an Arrhenius acid increases the concentration of OH- ions

Thus, an Arrhenius acid would yield H+ ions on ionization while an Arrhenius base will yield OH- ions on ionization

The Arrhenius acids in the list are:

HCl, HBr , H2SO4 , H3PO4 , HNO3 , HF

The Arrhenius bases are:

NaOH , NH4OH , LiOH , Ba(OH)2 , CsOH and KOH

The first step to find the mass of the 8 moles of NH₃ is to find the molar mass of NH₃. The molar mass of any compound is the mass of one mol of it. To calculate it, we have to look for the atomic masses of the elements that the molecule has.

N: 14.01 amu

H: 1.01 amu

Then the molar mass of NH₃ will be:

molar mass of NH₃ = 14.01 + 3 * 1.01

molar mass of NH₃ = 17.04 g/mol

Now that we know the molar mass of NH₃ (the mass of one mol of it) we can easily find the mass of 8 moles.

mass = 8 moles of NH₃ * 17.04 g/mol = 136.32 g

mass = 136.32 g

Answer: the mass in grams of 8 moles of ammonia is 136.32 g

The limiting reactant, given that 5.0 moles of CH₄ and 1.0 mole of O₂ are in the reactor is O₂

We'll begin by obtainig the balanced equation for the reaction. This is given below:

CH₄ + 2O₂ —> CO₂ + 2H₂O

The limiting reactant for the reaciont can be obtained as illustrated below:

From the balanced equation above,

1 mole of CH₄ reacted with 2 moles of O₂

Therefore,

5 moles of CH₄ will react with = 5 × 2 = 10 moles of O₂

From the above illustration, we can see that a higher amount of O₂ is needed to react completely with 5 moles of CH₄.

Thus, we can conclude that O₂ is the limiting reactant.

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The mass of 0.0750 moles of calcium is 3.01g.

To calculate the mass of calcium we need to use the molar mass that we can find in the Periodic Table of Elements.

The molar mass of calcium is 40.1 g/mol.

Now, with a mathematical Rule of Three we can calculate the mass of calcium of 0.0750 moles:

So, the mass of 0.0750 moles of calcium is 3.01g.

The correct statement about the description of ion whose symbol is Ca2+ among the choices above are:

The options b and d are correct.

It follows that elements whose charge on them are positive are called cations. In order words, in the periodic table of science of chemistry, the positively charged ions of elements are known as cations. Calcium has a positive of 2 on as it ion and this makes it a cation.

In addition to the above, calcium ion helps in signal transduction pathways of cells of living organisms. This goes to say that they also help in the body's normal functioning of the human body.

However, on a second note, calcium in the periodic table belongs to group 2, has a valence electrons of 2 and a metallic element; thereby making it a divalent metal.

In conclusion, we can now confirm from all said above that calcium above is a cation.

Complete question:

Check all of the following statements that are true about the ion whose symbol Ca2+

a. It is an anion

b. It is a cation

c. Its atoms is connected by tripple bonds

d. It is a divalent metal

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Explanation:

A 13.68 g sample of iron is reacted in presence of excess fluorine and an iron fluoride with a mass of 27.64 g is formed.

We have to find the empirical formula of our compound. This compound has two elements: Fe and F. We can express it like:

metal fluoride = FeₐFₓ

Where a is the subscript of Fe and x is the subscript for F.

First we have to find the mass of F present in the compound. We know that our compound has a total mass of 27.64 g and the mass of Fe present is 13.68 g. Since it only has two elements we can find the mass of F.

mass of sample = mass of Fe + mass of F

mass of F = mass of sample - mass of Fe

mass of F = 27.64 g - 13.68 g

mass of F = 13.96 g

So we found that our sample has 13.96 g of F and 13.68 g of Fe. Now we can determine the number of moles of each element that are present in the sample by using their molar masses.

molar mass of Fe = 55.85 g/mol

molar mass of F = 19.00 g/mol

moles of Fe = 13.68 g * 1 mol/(55.85 g)

moles of Fe = 0.245 moles

moles of F = 13.96 g * 1 mol/(19 g/mol)

moles of F = 0.735 moles

By definition the empirical formula is "simplest whole number ratio of atoms present in a compound". So if we want to find the ratio between them we have to divide both of them by the smallest number.

a = subscript of Fe = 0.245/0.245 = 1

x = subscript of F = 0.735/0.245 = 3

So the empirical formula of our compound is:

empirical formula = FeₐFₓ

empirical formula = FeF₃

Answer: empirical formula = FeF₃

Answer:

A: 0

B: 0

Explanation:

Initially the concentration of Mg+2 ions and F- ions is zero. The ICE table is:

Answer

The specific heat of the glass = 0.7366 J/g°C

Explanation

Given:

Mass of the glass sample, m = 9.3 g

Quantity of heat given off, Q = 87 J

Change in temperature, ΔT = 12.7 °C

What to find:

The specific heat, c of the glass.

Step-by-step solution:

The specific heat, c of the glass can be calculated using the given formula below.

Putting the values of the given parameters into the formula, we have;

Therefore, the specific heat of the glass is 0.7366 J/g°C

They give us the reactions with their respective products and reactants. To balance a reaction we must bear in mind that matter is neither created nor destroyed, it only transforms. So the mass that we have in the reactants must be the same in the products. We verify this by counting the atoms of each element on each side of the reaction.

In the first reaction we have nitrogen and hydrogen. We have 2 nitrogens and 2 hydrogens in the reactants. We start off-balanced in nitrogen, so we place coefficient 2 in the NH3 molecule to get 2NH3. Now that we have 2 nitrogens and 6 hydrogens in the products, we must balance the hydrogen in the reactants. For that, we place the coefficient 3 in the H2 in such a way that there will be 6 hydrogen atoms in the reactants. The equation is balanced and will be:

We do this same procedure for the other two equations. We count the atoms, we put the coefficients so that the number of atoms is conserved and we count again until the number of atoms of each element is the same on each side of the reaction. For the other two reactions we have:

0.02g/L

This question involves conversion of units and in this case, we are converting from g/ml to g/l.

1 g/ml = 1000 g/L

And we are given 0.020 g/ml to convert into g/L. The easiest way to do this is simply multiply 0.020 g/mL by 1000 to convert it into g/L

From the calculation above, 0.020g/ml is equivalent to 20g/L.

Hetergeneous mixture   peanuts and almonds mixed ,a bucket full of sand and gravel. Homogeneous Mixture -food coloring dissolved in water together in a bowl,cup of tea and sugar .          

When the composition of a mixture is not constant throughout the mixture, the mixture is said to be heterogeneous. A variety of  make up vegetable soup. Each mouthful of soup will have variable proportions of the soup's various veggies and other ingredients.

For illustration A mixture of sugar and water, or salt and water, both of which have the same component ratio throughout the mixture, are examples of homogenous mixes.

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The theoretical yield of the gold is 0985 g

Recall that the yield is defined as the mass of the product that is obtained in the reaction. Let us recall that a chemical reaction must involve the interaction of the reactants so as to obtain in a given amount, the products of the particular reaction that is in question.

Now;

Number of moles of the gold (III) oxide  = 1.1134 g/442 g/mol = 2.5 * 10^-3 moles

We can get the number of moles of the hydrogen from the ideal gas equation;

PV = nRT

n = PV/RT

n = 1.000 atm  * 20.0 L/0.082 atm LK-1mol-1 *  800K

n = 0.3 moles

Given that the mole ratio of the reaction is 1 mole of the oxide to three moles of hydrogen;

1 mole of gold (III) oxide reacts with 3 moles of hydrogen

2.5 * 10^-3 moles of gold (III) oxide reacts with 2.5 * 10^-3 moles *  3 moles /1 mole

= 7.5 * 10^-3 mole of hydrogen

Hence the hydrogen is present in excess.

The theoretical yield =

1 mole of the oxide produced 2 moles of the gold

2.5 * 10^-3 moles of the oxide produced 2.5 * 10^-3 moles * 2 moles/1 mole

= 5 * 10^-3 moles of gold

Theoretical yield = 5 * 10^-3 moles of gold * 197 g/mol

= 0985 g

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The correct answer in this case is binding energy, which is the energy released when a collection of nucleons form a nucleus.

The correct answer is the last choice.

Sodium chloride contains sodium and chlorine in its structure. Both are elemens, which means that sodium chloride is a compound.

It is not a mixture since it is not made of 2 different substance. It is a substance made of 2 elements, which means it is a compound.

The correct answer is B) compound.

Answer:

Explanation:

Here, we want to get the amount of heat released in KJ

From the change in enthalpy given and the equation of reaction, we know that 2 moles of HBr would lead to that amount of heat

Now, let us get the actual amount of heat released

We need to get the actual number of moles of HBr produced

Mathematically, we can calculate that by dividing the mass of HBr by its molar mass

We have that as:

From the reaction information:

-72 KJ was released by 2 moles

x KJ would be released by 0.0122 mol

To get the value of x, we have it that: