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Answer:

[tex]10^{-6} \frac{mol}{L}[/tex]

Explanation:

Comparing to the solution consisting a pH of 5 containing [tex]10^{-5}[/tex]  [tex]\frac{mol}{L}[/tex] of hydrogen ions, a solution having a pH of 6 consists of [tex]10^{-6} \frac{mol}{L}[/tex] of hydrogen ions. A solution having a pH of 7 too will have a pH of [tex]10^{-7} \frac{mol}{L}[/tex].

The factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing

Collision theory is a theory which describes of predicting the rate at which chemical reactions occurs between atoms and molecules of elements.

So therefore, the factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing

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The wavelength of a photon if the energy is 7.69 × 10⁻¹⁹ J is

Calculation,

Given energy = 7.69 × 10⁻¹⁹ J

Plank's constant =  6.626 × 10⁻³⁴ J.s

Formula used:

E = hv

v = c/ lemda

Where, c = speed of light =

lamda = wavelength of the photon

Putting the value of v in equation (i), and rearrange the equation.

E = hc/lemda =  6.626 × 10⁻³⁴ J×3[tex]10^{8}[/tex]/lemda =  7.69 × 10⁻¹⁹ J.s

lamda = 6.626 × 10⁻³⁴J×3[tex]10^{8}[/tex] m[tex]s^{-1}[/tex]/7.69 × 10⁻¹⁹J.s = 2.58× [tex]10^{-9}[/tex]m =2.58 nm

So, wavelength of a photon is 2.58 nm

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Answer:

The most basic answer to this is that the mitochondria generates energy for the cell's power needs.

But... (elaborated in explanation.)

Explanation:

As you may know, the mitochondria is the powerhouse of cells.

The mitochondria can ALSO identify cell death, and determine which cells (dead) must be destroyed.

The mitochondria helps regulate calcium storage, but quickly absorbing calcium ions until needed.

And lastly, the mitochondria can also help generate heat. A process called proton leak. This is known as non-shivering thermogenesis.

From the mole ratio CO₂ and CS₂ in the reaction, the moles of CO₂ produced is 0.109 moles.

The mole ratio of the reaction is the ratio in which the reactants combine to form products.

The mole ratio of the reaction is obtained from the equation of the reaction.

The equation of the reaction is given below:

Mole ratio of CO₂ and CS₂ is 1 : 1

Moles of CS₂ reacting = mass/molar mass

Molar mass of CS₂ is 76 g/mol

Mass of CS₂ reacting is 8.28 g

Moles of CS₂ reacting = 8.28/76

Moles of CS₂ reacting = 0.109 moles

Based on the mole ratio of the reaction, moles of CO₂ produced is 0.109 moles.

In conclusion, the moles of CO₂ produced is determined from the mole ratio CO₂ and CS₂ in the reaction.

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The mass of solid is 76.905 g.

Given that,

Total volume of solid and liquid = 81.0 mL

Mass of liquid = 40.5 g

Density of liquid = 0.865 g/mL

Density of solid = 2..25 g/mL

We need to calculate the volume of liquid

Using formula of density

[tex]Density = Mass/volume(V_{l} } )\\\\volume(V_{l} )=Mass/Density[/tex]

Put the value into the formula

[tex]V_{l} = 40.5/0.865\\\\V_{l} = 46.82 mL[/tex]

We need to calculate the volume of solid

Volume of solid = Total volume of solid and liquid- volume of liquid

[tex]V_{s} =81.0-46.82\\\\V_{s} =34.18 mL[/tex]

We need to calculate the mass of solid

[tex]P_{s}=M_{s} /V_{s} \\\\M_{s} =P_{s}V_{s}[/tex]

Using formula of density

Put the value into the formula

[tex]M_{s}=2.25 X 34.18\\\\M_{s}=76.905 g[/tex]

Hence, The mass of solid is 76.905 g.

A substance's density (more accurately, its volumetric mass density; sometimes known as specific mass) is its mass per unit volume. The most common symbol for density is (the lower case Greek letter rho).

There are three types of Density:

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This causes organic matter to decompose faster, releasing larger amounts of carbon dioxide into the atmosphere

As a result of climate change, tundra soils are thawing deeper and deeper and for a longer time in the upper layers of surface.

The tundra is a biome on the Earth that covers approximately 20% of its land mass, and it is almost exclusively located in the Northern Hemisphere.

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Principal energy levels describe regions of space where electrons may be found.

the greater the average distance from the nucleus.

The principal energy level of an electron is the shell or orbit in which the electron resides with respect to the nucleus. This level is represented by the principal quantum number n.

The principal quantum number n represents the total relative energy of each orbit. The energy level of each orbit increases as the distance from the nucleus increases. A set of orbitals with the same n value is often called the electron shell.

Only seven energy levels are required to contain all the electrons in any atom of any currently known element. As mentioned earlier, the energy associated with the energy level increases as the distance from the nucleus increases.

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The complete equation to following equation to make a double replacement reaction is: Na2SO4 + BaCl2 = BaSO4 + 2NaCl.

A double displacement reaction is the reaction that involves the replacement of two elements.

According to this question, barium sulfate (BaSO4) and sodium chloride are produced from the chemical equation given.

This clearly suggests that Sodium sulfate is the missing reactant, hence, the complete equation to following equation to make a double replacement reaction is:

Na2SO4 + BaCl2 = BaSO4 + 2NaCl.

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Answer:

B.) False

Explanation:

The mass number is determined by adding the number of protons and neutrons in an element's nucleus. Since carbon has 6 protons and 6 neutrons, the mass number is 12.

The atomic number is determined by the number of protons in an element's nucleus. Since carbon has 6 protons, the atomic number is 6.

Explanation:

1. The gaseous exchange in the lungs occurs in the alveoli. They are tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.

Ka value of monoprotic weak acid:

The experimental ka value of this acid is 6.3 × [tex]10^{-5}[/tex]  

Half-equivalence point:  

At half equivalence point, pH = pKₐ

The pKa is determined by the weak acid's Ka acid dissociation constant.

pKₐ = -log(Kₐ)

Kₐ = [tex]10^{-pKa}[/tex]

At the half equivalence point,

Kₐ = [tex]10^{-pH}[/tex]

Given,

pH = 4.20. By putting the value;

Kₐ = [tex]10^{-4.20}[/tex]

     = 6.3 × [tex]10^{-5}[/tex]  

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NO is a stable compound

The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create a more stable compound.

The majority of other odd-electron molecules, including NO, are highly chemically reactive and stable compounds. The second breach of the octet rule is the presence of molecules lacking electrons. Less than eight electrons are positioned around each atom in these stable compounds.

The overall molecular orbital arrangement of NO will be as follows, nitrogen has 7 electrons and oxygen has 8 electrons, according to the molecular orbital theory.

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Answer:

12.5 mL NH₃

Explanation:

To find the volume of NH₃, you need to (1) find the moles (NH₄)₂PtCl₄ (using the molarity equation), then (2) convert moles (NH₄)₂PtCl₄ to moles NH₃ (via mole-to-mole ratio from balanced equation, and then (3) find the volume NH₃ (using the molarity equation).

(Step 1)

25.00 mL / 1,000 = 0.025 L

Molarity = moles / volume (L)

0.100 M = moles / 0.025 L

0.0025 = moles (NH₄)₂PtCl₄

(Step 2)

The unbalanced equation:

(NH₄)₂PtCl₄ + NH₃ ----> Pt(NH₃)₂Cl₂ + NH₄Cl

Reactants: 2 nitrogen, 11 hydrogen, 1 platinum, 4 chlorine

Products: 2 nitrogen, 10 hydrogen, 1 platinum, 3 chlorine

The balanced equation:

(NH₄)₂PtCl₄ + 2 NH₃ ----> Pt(NH₃)₂Cl₂ + 2 NH₄Cl

Reactants: 3 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine

Products: 2 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine

0.0025 moles (NH₄)₂PtCl₄              2 moles NH₃
----------------------------------------  x  ------------------------------  =  0.0050 moles NH₃
                                                      1 mole (NH₄)₂PtCl₄

(Step 3)

Molarity = moles / volume (L)

0.400 M = 0.0050 moles / volume

(0.400 M) x volume = 0.0050 moles

volume = 0.0125 L NH₃

0.0125 L x 1,000 = 12.5 mL NH₃

Answer: To determine the mass of the 7.3 moles of a compound Taran also needs to know the molar mass of the compound

Explanation: Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.

Add it all together and put units of grams/mole after the number.

It gives us the molar mass of the compound taken.

Multiply it with number of moles i.e., 7.3 moles, you will get the mass of the 7.3 moles of a compound.
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[tex]oxidation \: number \: of \: oxygen = \\ before \: rxn = - 2 \\ after \: rxn = - 2[/tex]

[tex]oxidation \: number \: of \: hydrogen = \\ before \: rxn = + 1 \\ after \: rxn = \\ 2x - 2 = 0 \\ x = + 1[/tex]

[tex]oxidation \: number \: of \: carbon = \\ before \: rxn = \\ x - 6 = - 2 \\ x = 4 \\ after \: rxn = \\ x - 4 = 0 \\ x = 4[/tex]

[tex]oxidation \: numbers \: remain \: constant \\ so \: none \:a re \: undergoing \: oxidation \: \\ nor \: reduction \: [/tex]

Answer:

D

Explanation:

I believe that is the answer

Based on the value of temperature increase, the best solute to be used in the hot pack is calcium chloride.

Exothermic reactions are reactions in which heat is liberated or given by the substances reacting.

The reaction in hot packs are exothermic reactions.

Based on the increase in temperature observed when 20 g of each solute is  mixed into separate containers that each held 50 mL of 24°C water, the best solute to be used in the hot pack is calcium chloride.

In conclusion, exothermic reactions give off heat.

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Bonding gels and gel primers are designed specifically to improve adhesion of light cured gels to the natural nail plate and is therefore denoted as option C.

This is defined as the tendency of particles or substance which have dissimilar origins to stick to one another. A common adhesive is referred to as glue, cement etc  and ensures there is enough resistance for their separation in case of the presence of any type of external force or stimuli acting on them.

Gel primer is referred to a vital used in makeup and serves as a form of foundation before they are applied on the skin of individuals so as to enable it stick and also look more presentable.

This is therefore the reason why gel primers was chosen as the most appropriate choice.

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Lidocaine is available in an ampule with 100 mg in 5 ml of solution. We need to give 3.25ml to administer 65mg.

Lidocaine is an anesthetic that has the power to neutralize neuromal membranes.

Given data:

Amount desired (D) = 65 g

Amount on hand (H) = 100 mg

Quantity = 5 mL

Plug in what you know into the formula and simplify.

[tex]\frac{Amount desired}{Amount in hand}[/tex] × quantity

[tex]\frac{65}{100}[/tex] × 5

0.65 × 5 = 3.25ml

Therefore, When Lidocaine is available in an ampule with 100 mg in 5 ml of solution. We need to give 3.25ml to administer 65mg.

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The molecule obeying the octet rule is option (D) O3.

According to the octet rule, an atom's outer shell or orbit needs to contain eight electrons for the molecule to be stable. Knowing the number of valence electrons in a molecule is made easier by Lewis structure. The electrons involved in bond-forming and non-bonding electron pairs are known as valence electrons.

Each oxygen molecule in ozone or O3 has six valence electrons.Due to the presence of three oxygen molecules, there are a total of 18 valence electrons (6*3=18). Therefore, the Ozone molecule has a total of 18 valence electrons accessible.

Therefore,The molecule obeying the octet rule is option (D) O3.

The resonance structure of O3 is given below;

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The name of pb(no3)2 is Lead(II) nitrate.

pb(no3)2 is an ionic compound.

How to name ionic compound?

Name of pb(no3)2:

The charge of nitrate ion NO3 is -1. To find the charge of lead, we'll take it as x. Hence,

x+2(-1)=0

x=2

The charge of lead cation in this ionic compound is calculated as +2.

Therefore the name of pb(no3)2 is confirmed as Lead(II) Nitrate.

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Substances in order of increasing vapor pressure at a given temperature is SF4 < SF6 < SiH4

Which has highest vapor pressure?

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In sharp contrast to elimination reactions, addition reactions are generally favored at low temperature, because enthalpy term is more likely to be negative at such temperatures.

An addition reaction is an organic reaction occur when two or more molecules combine to form a larger molecule without the loss of any atoms present in reactant. Addition reaction is favored at low temperature.

Elimination reaction is a type of organic reaction where many atoms either in groups or pairs are removed from a molecule. Elimination reaction is favored at high temperature.

Thus from the above conclusion we can say that In sharp contrast to elimination reactions, addition reactions are generally favored at low temperature, because enthalpy term is more likely to be negative at such temperatures.

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In the subgranular zone

Let's check the equation

[tex]\sf NH_3+H^+\leftrightharpoons NH_4^+H_2O[/tex]

As per Le ch a.tlers principle

So

If we remove NH_4+

Water would increase

Option C

In a voltaic cell, a salt bridge is needed to allow the motion of ions between the terminals. In the salt bridge, anions move toward the anode and cations move toward the cathode.

A voltaic cell is an electrochemical device that harnesses the power of a chemical process to generate electrical energy. A voltaic cell's key components are:

When an electrode is dipped into the electrolyte at the electrode and electrolyte contact surface in a voltaic cell, the electrode's atoms tend to produce positive ions in the electrolytic solution while leaving the electrode's electrons unaffected. The electrode thus acquires a negative charge.

Additionally, the electrolytic solution's positive ions have a propensity to deposit on the electrode, giving it a positive charge. The electrodes get positively or negatively charged in relation to the electrolyte as a result of the two opposite processes. As a result, there is a potential difference between the electrode and electrolyte. The term "electrode potential" refers to this potential difference.

Now, the electrode where reduction occurs is known as the cathode and turns positive in relation to the electrolytic solution, whereas the electrode where oxidation occurs is known as the anode and has a negative potential in relation to the electrolytic solution. This caused a potential difference to form between the voltaic cell's two electrodes. Cell Potential is the name given to this potential differential.

The voltaic cell's potential is sometimes referred to as its electromotive force (EMF) when no current is being drawn from it. Electrons begin to flow from the anode (negative electrode) to the cathode when an external circuit is connected to the voltaic cell (positive electrode). As a result, in the external circuit, the normal current flows from the positive terminal to the negative terminal.

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The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.

Melting point is usually defined as the temperature at which solid changes to liquid.

The melting point order of B, Al, Ga, Tl is B > Al> Tl > Ga due to structural changes, melting point increases from Ga to Tl. Hence Ga has the lowest melting point among all these.

Thus from the above conclusion we can say that The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.

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Based on the the US Environmental Protection Agency guidelines, the maximum allowable concentration of lead in drinking water, yearly intake of lead by the individual = 8.21 mg.

I would not willingly drink the water due to the risk of lead poisoning.

Based on the US Environmental Protection Agency guidelines, the maximum allowable concentration of lead in drinking water is 0.015 mg/L.

a)Given daily average intake of water is 1.5, in one year;

Volume of water intake = 1.5 * 365 = 547.5 L

Yearly intake of lead by the individual = 0.015 mg/L * 547.5

Yearly intake of lead by the individual = 8.21 mg

b) I would not willingly drink the water due to the risk of lead poisoning.

In conclusion, safe, drinking water should be free on contaminants such as lead to avoid lead poisoning.

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The mass of carbon in 1 liter of mixture = 1.108 g

The mass of carbon in 1 liter of the mixture is determined as follows:

First the moles of gas is determined using the ideal gas formula:

n = (1 * 1)/(0.08205L * 298)

n = 0.0409 mole of total gas

mass of gas is then determined using the formula:

mass = 1 * 1.375

mass = 1.375 g

Let x = mass of CH₄ and y = mass of C₄H₁₀

x + y = 1.375 g

nCH₄ + nC₄H₁₀ = ntotat

moles = mass/molar mass

x + y = 1.695 => y = 1.695 - x

(x/molar mass of CH₄) + [(1.375 - x)/ molar mass C₄H₁₀ = 0.0409

x/16 + (1.375 - x)/58 = 0.0409

x = 0.380 g CH₄

y = 1.375 - 0.380

y = 0.995 g of C₄H₁₀

mass of C in CH₄ = 12/16 * 0.380 = 0.285

mass of C in C₄H₁₀ = 48/58 * 0.995 = 0.823

Mass of carbon in 1 liter of mixture = 0.285 + 0.823

Mass of carbon in 1 liter of mixture = 1.108 g

In conclusion, the carbon is the major component in the mixture.

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