What is the balanced, net ionic equation for the reaction described below?Aqueous sodium phosphate and aqueous iron (III) chloride react to produce aqueous sodium chloride and solid iron (III) phosphate.

The boiling point of the solution is 80.93°C.

We know that the boiling point has to do with the temperature at which the pressure inside the system is the same as the atmospheric pressure. Now we know that the boiling point of the pure benzene is 80.1 °C.

Also;

ΔT = K m i

ΔT = boiling point elevation

K = boiling point constant

m = molality

i = Van Hoff factor

ΔT = 2.53°C /m * 0.33 m * 1

ΔT =  0.83°C

Boiling point of the solution =  0.83°C + 80.1 °C

= 80.93°C

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Explanation:

PHOTOSYNTHESIS

The empirical formula for a compound composed of 9.93% carbon, 58.6% chlorine, and 31.4% fluorine is CCl₂F₂.

To write the empirical formula, let us assume that total mass of the compound is 100 g, then-

Mass of carbon = 9.93 g

Mass of chlorine = 58.6 g

Mass of fluorine = 31.4 g

We know that,

Molar mass of Carbon = 12.0 g/mol

Molar mass of Chlorine = 35.5 g/mol

Molar mass of Fluorine = 18.9 g/mol

Now, we will calculate the number of moles of each using the formula -

Number of moles = Given mass

                                 Molar mass

Moles of Carbon =   9.93 g     = 0.82 mol

                               12.01 g/mol

Moles of Chlorine =    58.6 g     = 1.65 mol

                                 35.5 g/mol

Moles of fluorine =    31.4 g     = 1.66 mol

                                18.9 g/mol

Now, divide each value with the smallest amount of mole we got,

carbon = 0.82 = 1

               0.82

chlorine = 1.65 =  2

                 0.82

fluorine = 1.66 = 2

                0.82

Therefore, the empirical formula of the compound can be written as - CCl₂F₂

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The gas that  behaves most like an ideal gas at the conditions indicated is H2(g) molecules at 10-3 atm and 200°C

Recall that a gas is said to show an ideal behavior when the pressure of thee gas is low and the temperature of the gas is high. Recall that, at a high temperature and a low pressure, the interaction that exists between the molecules of the gas is decreased as such the molecules of the gas would tend to move faster.

We can see that the hydrogen gas has a lower pressure at the same temperature hence the interaction that is know to exists between the molecules of the gas is minimal.

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Answer:

Explanation:

Here, we want to get an empirical formula

We start by dividing each of the masses by the corresponding atomic masses

The atomic mass of carbon is 12 amu

The atomic mass of hydrogen is 1 amu

We start the division as follows:

Now, we divide the results by the smaller of the two:

Thus, we have the empirical formula as:

Isopropyl alcohol + water = Solution

Solute = Isopropyl alcohol

Solvent = water

% V/V = mL of solute / 100 ml of solution

Now we have 655 mL of solution.

32.0 % V/V means 32 mL of Isopropyl alcohol dissolved in 100 mL of solution.

So,

32 mL Isopropyl alcohol ------------------- 100 mL Solution

x ------------------- 655 mL Solution

x represents the volume of Isopropyl alcohol in 655 mL of solution

Now

Alcohol: 209.6 mL

Water: 655 mL (solution = Alcohol + Water) - 209.6 mL (alcohol) = 445.4 mL of water

If the photon has a frequency of   3.16 × 10 ⁷ Hz, then the energy of the the photon as per Planck's law would be 1.978× 10⁻²⁶ Joules

It can be understood in terms of the distance between any two similar successive points across any wave.

C = λν

As given in the problem we have to calculate the energy of the light if the frequency of light is  3.16 × 10 ⁷ Hz

The energy of the photon = h ν

                                           = 6.26 × 10⁻³⁴ × 3.16 × 10 ⁷

                                           = 1.978× 10⁻²⁶ Joules

Thus, If the photon has a frequency of   3.16 × 10 ⁷ Hz, then the energy of the the photon as per Planck's law would be 1.978× 10⁻²⁶ Joules.

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2.0724moles

Given the balanced chemical reaction between Na2CO3 and CaCl2 expressed as:

Given the following parameters

Mass of CaCl₂ = 115g

Determine the moles of CaCl₂

According to stochiometry, 1 mole of CaCl2 prodcues 2 moles of NaCl. The moles of NaCl requred is given as:

Therefore moles of NaCl made is 2.0724moles

First, we assume STP conditions and Ideal gas conditions.

In STP conditions, we say that:

1 mol of any gas = 22.4 L (liters)

Procedure:

1 mol Xe ------ 22.4 L (STP)

4.51 moles Xe ------- X

X = 101 L

Answer: 101 L

The likely to be TRUE about a hair sample that is four centimeters long and lacks a root or follicular tissue is there will be mitochondrial DNA present (Option A).

Mitochondrial DNA is a type of genetic material that is independent of nuclear DNA and is contained in an organelle known as mitochondrion. These organelles (mitochondria) are the energy factors of the cell because they generate ATP through the process of cellular respiration.

Generally, the cells that contain cell nuclei also contain different organelles such as mitochondria, and this observation also includes the hair cell follicles that are differentiated specialized types of cells present in the hair.

Therefore, with this data, we can see that mitochondrial DNA  is different from nuclear DNA and it is found in tissues that are subject to differentiation such as follicular tissues which need energy to differentiate.

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Answer

number of moles = 0.171 mol

Explanation

Given

Volume of oxygen = 4.0 L

Temperature = 37 °C = 310 K

Pressure = 110 kPa = 1.08562 atm

we know R = 0.082 L.atm.k/mol

Required: number of moles

Solution

To solve this problem, use the ideal gas law

PV = nRT

n = PV/RT

n = (1.08562 x 4.0 L)/(0.082 L.atm.k/mol x 310 K)

n = 0.171 mol

The bulk properties of a substance (macroscopic) such as electrical conductivity can be caused by the microscopic such as electrical forces in the atoms through the movement of free electrons.

This is referred to as the measure or the degree in which a substance conducts electricity and how the electric current moves within a substance.

The electrical conductivity which is macroscopic can be caused by the microscopic such as electrical forces as a result of the electrons moving in the body. The movement of the electron is usually from the negative to the positive terminal of the body.

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Promethium is the 61st element that you can find in the periodic table and the number 147 indicates the atomic mass.

Remember that the atomic number (in this case, 61) represents the number of protons, so there are 61 protons in Pm-147.

And to find the number of neutrons, we have to subtract the atomic number (61) from the atomic mass (147):

So, the final answer is that we have 61 protons and 86 neutrons of Pm-147.

Taking into account the definition of enthalpy of a chemical reaction, 2.345 moles of CH₃OH are required to give off 1501 kJ of heat

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when chemicals are transformed into a chemical reaction at constant pressure.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

In this case, the balanced reaction is:

2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g)

and the enthalpy reaction ∆H° has a value of -1280 kJ/mol.

This equation indicates that when 2 moles of CH₃OH reacts with 3 moles of O₂, 1280 kJ of heat is released.

If it is required to give off 1501 kJ of heat, you can apply the following rule of three: If 1280 kJ of heat is released by 2 moles of CH₃OH, 1501 kJ of heat is released by how many moles of CH₃OH?

amount of moles= (1501 kJ× 2 moles of CH₃OH)÷ 1280 kJ

amount of moles= 2.345 moles of CH₃OH

In summary, the amount of moles required are 2.345 moles.

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If 1.53 g of copper is heated with excess sulfur to yield 1.76 g of copper (I) sulfide, the percent yield would be  75.43%.

The percent yield of a reaction is the actual yield relative to the theoretical yield of the same reaction.

The percent yield of a reaction is mathematically expressed as:

Percent yield = actual yield/theoretical yield x 100%.

Let us now consider the reaction in question. The equation of the reaction is given as:

[tex]Cu + S --- > CuS[/tex]

The mole ratio of the copper that reacts to the copper sulfide that is formed is 1:1.

Recall that: mole = mass/molar mass

The molar weight of copper is 63.55 g/mol

Mole of 1.53 g copper = 1.53/63.55

                           = 0.024 moles

The equivalent mole of copper sulfide produced will also be 0.024 moles.

The molar mass of CuS is 95.61 g/mol

Mass of 0.024 moles CuS = 0.024 x 96.61

                                      = 2.32 g

2.32 g is the theoretical yield of the reaction. But 1.76 g of copper sulfide is the actual yield.

Percent yield = 1.75/2.32 x 100%

                      = 75.43%

Thus, the percent yield of the reaction, if 1.53 g of copper is heated with excess sulfur to produce 1.76 g of copper (I) sulfide, is 75.43%.

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The true statement about  is expert witnesses that they are required to link all evidence to the crime.

So, option C is correct.

An expert witness is described particularly in common law countries such as the United Kingdom, Australia, and the United States, is a person whose opinion by virtue of education, training, certification, skills or experience, is accepted by the judge as an expert.

Expert witnesses are required or expected to to link all evidence to the crime.

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According to the given statement one mole of potassium has a mass of 39.1 g.

Each element's atomic weight is listed in a periodic table along with how many grams (or an Avogadro number) are needed to make one mole of atoms. Since potassium has an atomic weight of 39.0983 g/mole, a mole of potassium weighs 39.1 g.

Avogadro's number, which is equal to 6.02214076 * 10²³, is the quantity of units in one mole of any material (defined as its molecular weight in grams). Depending on the substance and the nature of the reaction, the units could be electrons, atoms, ions, or molecules.

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Answer:

Explanation:

Answer to the 1st one. I have my doubts for the second one so didn't post :)

The chemical element which magnesium would combine with in order to attain a subscript of 3 is nitrogen which result in the formation magnesium nitride ( Mg₃N₂ )

Magnesium is a metallic element which belongs to group 2 and and has a valence electron of 2. This means that in an electrovalent combination, magnesium loses 2 valence electrons to nitrogen to become Mg2+ ion. To complete this bonding, nitrogen which has 5 valence electrons accepts 3 of Mg2+ ions in addition with with its two N3− ions to form magnesium nitride. When this happens, magnesium then attains a subscript of 3.

Magnesium nitride is an electovalent or ionic compound and the bond which exist in it is Ionic bond. It is used in the synthesis of ceramic substances.

So therefore, we can confirm from above that when magnesium reacts with nitrogen, it attains a subscript of 3.

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Nitrogen is the chemical element that magnesium would mix with to get a subscript of 3, leading to the production of magnesium nitride.

Chemical elements are defined as a type of atom, including the pure substance made entirely of that type, with a specific number of protons in its nucleus.

Magnesium is a metallic element with a valence electron number of 2, and it is a member of group 2. This indicates that magnesium loses two valence electrons to nitrogen in an electrovalent combination to form the Mg2+ ion. Nitrogen, which has five valence electrons, accepts three Mg2+ ions in addition to its two N3 ions to complete this bonding and create magnesium nitride. Magnesium then achieves a subscript of 3 when this occurs.

Thus, Nitrogen is the chemical element that magnesium would mix with to get a subscript of 3, leading to the production of magnesium nitride.

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The question requires us to calculate the number of moles that corresponds to 5.01 x 10^22 atoms of magnesium.

To solve this question, we'll need to use the Avogadro constant. This number, defined as 6.02 x 10^23, relates the number of constituent particles (molecules, atoms or ions, for example) in a sample with the amount of substance in that sample. We can use it by saying that 1 mol of a substance corresponds to 6.02 x 10^23 constituent particles of this substance.

Then, using the information above, we can calculate the number of moles in 5.01 x 10^22 atoms of magnesium (Mg):

6.02 x 10^23 atoms of Mg --------------- 1 mol of Mg

5.01 x 10^22 atoms of Mg ---------------- x

Solving for x, we'll have:

Therefore, 5.01 x 10^22 atoms of magnesium corresponds to 0.0832 mol of this element.

The Lewis Structure for NH₄⁺ (Ammonium ion) is described as having four sigma bonds around a Nitrogen Atom. It is also to be noted tha there is a +1 charge on the Nitrogen atom.

The nitrogen atom is surrounded by four sigma bonds. As a result, the form of NH4+ is tetrahedral. The total number of sigma bonds and lone pairs surrounding the nitrogen atom is four. As a result, the geometry should be tetrahedral.

Lewis structures also referred as Lewis dot formulas, Lewis dot frameworks, electron dot structures, or Lewis electron dot structures, are schematics that depict the bonding between atoms in a molecule as well as any lone pairs of electrons that may occur.

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Answer

The element that is oxidized is Si and the one that is reduced is F₂.

Explanation

Si + 2F₂ → SiF₄

The given reaction is an oxidation-reduction (redox) reaction:

Oxidation: Si → Si⁴⁺ + 4e⁻

Reduction: 2F₂ + 4e⁻ → 4F⁻

Si is a reducing agent, and F₂ is an oxidizing agent.

An oxidizing agent gains electrons and is reduced in a chemical reaction.

A reducing agent loses electrons and is oxidized in a chemical reaction.

Therefore, the element that is oxidized is Si and the one that is reduced is F₂.

[tex]2K_(s) + Cl_2_(g)[/tex] ⇒ [tex]2KCl_(aq)[/tex]

Type of Reaction: Synthesis

What is a synthesis reaction?

When 2 or more substances react to form a single compound.

The correct answerwer is option D.

D)The artificial cell will become more turgid.

What is a cell?

The cell is the basic building block of all living things. The human body contains many cells and they provide structure for the body. They take in nutrients from the food and convert them to energy for the body. they also carry out specialized functions.

Artificial cells are engineered particles that look like natural biological cells. example proteins, genes, enzymes, etc

Flaccid cells are shrunken cells while turgid cells are stretched due to the absorption of water.

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Step 1

Molarity is defined as:

Molarity (M or mol/L) = Moles of lead (II) oxide/Volume of solution (L)

Molarity = mass of lead (II) oxide/molar mass of lead (II) oxide x volume (L) (1)

-------------------------

Step 2

The molar mass of PbO = 223 g/mol

PbO = lead (ll) oxide

------------------------

Step 3

Data provided:

Molarity = 0.75 M

Mass of PbO = 75 g

------------------------

Step 4

Procedure:

The volume of the solution is cleared from (1):

Volume (L) = mass PbO/(molar mass PbO x Molarity)

Volume (L) = 75 g/(223 g/mol x 0.75 mol/L) = 0.45 L approx.

Answer: Volume = 0.45 L

Answer

c. Fe2(SO4)3

Explanation

The polyatomic ion (SO₄)⁻² has a net charge of -2 and iron (III) ion, Fe⁺³ has an oxidation number of +3. For a compound to be formed between them, two of Fe⁺³ will need three of the polyatomic ion, (SO₄)⁻² and the formula of the compound will be Fe2(SO4)3.

The shortest wavelength of light capable of dissociating the Cl–Cl bond in one molecule of chlorine is 493 nanometer.

The formula to calculate Energy is given as follows :

E = BE / Na

E = energy

BE = bond energy = 243 KJ / mol

Na = Avogadro number = 6.02 × 10²³

substituting the values in the formula:

E = 243 × 10³ / 6.02 × 10²³

E = 4.03 × 10⁻¹⁹ J

By using Einstein equation for photon , we can calculate the shortest wavelength :

E = (h c) / λ

E = energy

h = Planck constant = 6.626 × 10⁻³⁴ J.s

c = speed of light =  3 × 10⁸ m/s

λ = wavelength

therefore,

λ = (hc )/ E

λ =( 6.626 × 10⁻³⁴ J.s × 3 × 10⁸ m/s ) /  4.03 × 10⁻¹⁹ J

λ = 4.93 × 10⁻⁷ m

λ = 493 × 10 ⁻⁹ m

1 nm = 1 × 10 ⁻⁹ m

Shortest wavelength = 493 nanometer.

Thus, The shortest wavelength of light capable of dissociating the Cl–Cl bond in one molecule of chlorine if the bond energy, or bond dissociation energy, is 243 kJ/mol  is 493 nanometer.

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The chemical formula of calcium (II) oxide is CaO, wherein the valency of both oxygen and calcium is two.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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The equation that is the net description of the ions involved is;[tex]CO_{3} ^{2-} (aq) + 2H^{+} (aq)----- > H_{2} O(l) + CO_{2} (g)[/tex]

The term net ionic equation has to do with the final ionic equation which does not include the spectator ions. What I mean by the spectator ions are those ions that do not undergo a change in a chemical reaction. The first step when we want to write the net ionic equation is first to write down the molecular equation and balance the equation accordingly.

We shall now show the balanced overall reaction equation of the process

Thus, the balanced molecular equation of this reaction is; [tex]Na_{2} CO_{3} (aq) +2 HCl(aq) ----- > NaCl(aq) +H_{2} O(l) + CO_{2} (g)[/tex]

The net ionic equation is;

[tex]CO_{3} ^{2-} (aq) + 2H^{+} (aq)----- > H_{2} O(l) + CO_{2} (g)[/tex]

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Identify the substance as an acid or a base and put an "X" in the box lemon juice is the acid sodium hydroxide is the base and ammonia is the weak base and HCl is the strong acid

An acid is the any hydrogen containing substances that is capable of donating a proton to another substances and base is the molecule or ion able to accept a hydrogen ion from acid and acidic substances are usually identified by their sour taste and here given example are lemon juice acidic because they contain high amount of citric acid and sodium hydroxide is the base because they dissociate completely into the solution to form hydroxide ion and ammonia is the weak base because nitrogen atom has electron pair that easily accept a proton and HCl is the strong acid because  it dissociate almost completely

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