A gas with a pressure of 735 mm Hg and a volume of 4L is allowed to expand to a volume of 12L. What is the pressure of the gas when the volume reaches 12 L, if the temperature remains constant?

Answer:

the explanation of this 20

Explanation:

20 c

NOTES TO TAKE DOWN:

Apparent brightness is a human measurement, and it would change for each star if the measurement were taken from another location. The more precise counterpart of apparent brightness is called absolute brightness (or absolute magnitude) and is the measure of the luminosity of a star, but on a common scale.

ANSWER:

Absolute brightness is the actual amount of light produced by the star, whereas apparent brightness changes with distance from the observer.

The time to plate 29.6g of Nickel at 4.7A is 170 minutes.

What are Faraday Laws of Electrolysis?

The Faraday law states that the amount of current is proportional to the quantity of the current and the amount of chemical changes is proportional to their equivalents weight.

To calculate the time, we use

Charge = current × time

Moles of Ni = (4.7 A × time in seconds) / (96,485 C/mol)

Mass of Ni (g) = [(4.7 A × time in seconds) / (96,485 C/mol)] × 58.69 g/mol

29.6 g = [(4.7 A × time in seconds) / (96,485 C/mol)] × 58.69 g/mol

Simplifying the equation respectively,

Time in seconds = (29.6 g × 96,485 C/mol) / (4.7 A × 58.69 g/mol)

Time in minutes = (29.6 g × 96,485 C/mol) / (4.7 A × 58.69 g/mol × 60 s/min)

Time in minutes ≈ 1.7 × 10² minutes.

Therefore, the time taken is 170 minutes.

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The nurse teaches a client about the dangers of using sodium bicarbonate regularly. The effect of sodium bicarbonate is the nurse trying to prevent will be Sodium bicarbonate use over an extended period of time may result in sodium and water retention together with systemic alkalosis.

Feeling thirsty, experiencing stomach cramps, and experiencing gas are typical sodium bicarbonate side effects. You could be more vulnerable to adverse reactions that are more severe if you have certain medical conditions, such as high blood pressure, heart failure, and especially kidney disease.

An antacid was using to treat acid indigestion and heartburn is also sodium bicarbonate. In some circumstances, your doctor may also advise you to take sodium bicarbonate to reduce the acidity of your blood or urine. Ask your doctor as well as a pharmacist for more details if you're interested in using this drug for any other conditions.

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Answer:

A

Explanation:

Your answer is A

Answer:

A is the answer

Explanation:

Answer:

dfdfaxc b

Explanation:

Answer:

A) 3 to 2

Explanation:

The Balmer series refers to all transition series of spectral emission lines of the hydrogen atom in which an electron moves from any higher energy level within the atom down to the energy level with principal quantum number n=2.

The Balmer series was originally calculated using the Balmer formula, this is an empirical equation first deduced by Johann Balmer in 1885.

Hence, a transition from n=3 level to n=2 level is in the Balmer series.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, a reaction occured between ammonia gas and oxygen gas to produce nitrogen gas and water.

Based on the equation, 4 moles of ammonia requires 3 moles of oxygen gas to react.

This means that 3.53 moles of ammonia will require 3.53 × ¾ = 2.65 moles of oxygen gas.

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The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.

Y is the septum

The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.

Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.

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The volume of the granite was determined by water displacement and is found to be 9.35 ml. The volume of granite in cm³ is 9.35 cm³

We know that, 1 ml = 1 cm³

We need to convert the volume from ml to cm³

The volume of the granite that was determined by water displacement is observed to be 9.35 ml.

After the conversion of volume of granite from ml to cm³, its volume in cm³ would be

1 ml = 1 cm³

9.35 ml = 9.35 cm³

Therefore, the volume of the granite that was determined by water displacement is 9.35 cm³

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Answer:

something cyan colored?

Answer:

2 HNO3 + CaCO3 = Ca(NO3)2 + H2O + CO2

Explanation:

Given Equation :

\(HNO_3 + CaCO_3 = Ca(NO_3)_2 + H_2O + CO_2\)

Balanced Equation

\(2 HNO_3 + CaCO_3 = Ca(NO_3)_2 + H_2O + CO_2\)

From the fact that the bond order would reduce from one to 0.5, it shows that the ionized specie is weaker than the hydrogen molecule that has not yet been ionized.

The term bond strength has to do with how strong the bond that holds two atoms together is. We know that the stronger the bond, the more difficult it would be to break the bond by whatever means.

In this case, we are told that when we ionize the hydrogen molecule, the strength of the bond is changed. This implies that the bond would become weaker as the bond order of the specie would reduce from one to 0.5.

Also, the lesser the bond order, the weaker the molecule is. It then follows that the hydrogen molecule that has not been ionized with a bond order of one has a stronger bond than the ionized specie that has a bond order of 0.5.

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Seal in a labeled plastic bag, then place in the solid waste container.

Due to potential contamination, spill-cleaning materials should always be discarded as hazardous waste. This means that materials like absorbents and cleaning equipment need to be stored and packaged for hazardous waste disposal. After being packaged, the cleaning products should be sent to a facility for the disposal of hazardous waste.

A robust spill response strategy might shield workers from injury and prevent thousands of dollars in damages. You must have a thorough plan in place in the event of a spill if you are working with hazardous materials. Not only must this plan be precisely laid out, but staff members also need to be properly instructed in how to carry it out. The difference between a minor leak and a serious catastrophe could be determined by an emergency spill response strategy.

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Answer:

2.5

Explanation:

Compact fluorescent (CFL) bulbs compared to incandescent bulbs can offer a greater efficiency of lighting by utilizing less electricity. CFL bulbs usually last longer than incandescent bulbs. how CFL bulbs compare to incandescent bulbs is that CFL bulbs are more energy-efficient, last longer, and generate less heat than incandescent bulbs.

CFL bulbs can provide up to 75% energy savings compared to incandescent bulbs. It is because CFL bulbs use less energy to produce the same amount of light.                                                                                                                           how CFL bulbs compare to incandescent bulbs may be: Compact fluorescent bulbs (CFLs) and incandescent bulbs are two types of bulbs that have distinct features and characteristics. CFL bulbs and incandescent bulbs are compared based on their wattage, lifespan, environmental impact, and energy efficiency. When compared to incandescent bulbs, CFL bulbs can be considered to have better energy efficiency. CFL bulbs are considered to be four times more efficient than incandescent bulbs, consuming only 25% of the electricity required for the same amount of light. As a result, CFL bulbs can provide up to 75% energy savings compared to incandescent bulbs. It is because CFL bulbs use less energy to produce the same amount of light. CFL bulbs usually last longer than incandescent bulbs, meaning that they need to be replaced less frequently. CFL bulbs have a lifespan of 6,000 to 15,000 hours, while incandescent bulbs have a lifespan of about 1,000 hours. Due to their long-lasting nature, CFL bulbs are an environmentally friendly option because they reduce the amount of waste generated by light bulbs. CFL bulbs also generate less heat than incandescent bulbs. CFL bulbs are cooler than incandescent bulbs because they release less heat.

Furthermore, the heat generated by incandescent bulbs can cause issues, particularly in confined spaces or areas where the heat is unwanted. In contrast, CFL bulbs produce little heat, making them an excellent alternative for regions where temperature control is crucial. In conclusion, compared to incandescent bulbs, CFL bulbs are more energy-efficient, last longer, and generate less heat.

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The shutdown decision can be restated in terms of producer surplus by saying that A, a firm should produce in the short run as long as revenue exceeds producer surplus

Producer surplus represents the difference between the revenue received by the firm and the minimum amount needed to cover variable costs. If the producer surplus is positive, it indicates that the firm is covering its variable costs and contributing towards fixed costs. In this situation, it is financially viable for the firm to continue production, even if it's not generating profit.

However, if the producer surplus becomes negative, the firm is unable to cover its variable costs, and a shutdown may be the optimal decision. It is important to note that the focus is on variable costs rather than fixed costs or profit, as fixed costs will still need to be paid regardless of production levels. So therefore the shutdown decision, in terms of producer surplus, the correct answer is A. a firm should continue production in the short run as long as the producer surplus exceeds variable costs.

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A half-reaction in electrochemistry known as a reduction half-cell reaction illustrates the reduction step in a redox reaction. A reduction process takes place in a reduction half-cell when an oxidising agent

A half-reaction is a chemical reaction in electrochemistry that demonstrates the independent occurrence of either an oxidation or a reduction process. A whole redox reaction is made up of two simultaneous half-reactions, an oxidation and a reduction. Just one element or compound is involved in a half-reaction, and it is either reduced or oxidised. In the half-reaction, the electron acceptor is reduced and the electron donor is oxidised, demonstrating the transfer of electrons.A balanced chemical equation using electrons as either reactants or products often contains a half-reaction. To guarantee charge conservation, the electrons are balanced on both sides of the equation. Understanding electrochemical processes like corrosion, batteries, and electrolysis requires the use of half-reactions. They enable

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Answer:

How likely something is to happen.

The H2PO4- ion is predicted to be acidic due to its ability to donate a proton in solution.

The ion H2PO4- (dihydrogen phosphate) is predicted to be acidic. To understand why, let's examine the structure of the H2PO4- ion. It consists of a central phosphorus atom bonded to four oxygen atoms: two of these oxygen atoms are single-bonded (H-O-P-O-) and the other two oxygen atoms are double-bonded (O=P=O).

The presence of the double-bonded oxygen atoms and the lone pair of electrons on the central phosphorus atom indicates that the H2PO4- ion can donate a proton (H+) in solution, making it an acidic species.

When H2PO4- is dissolved in water, it can donate a proton from one of its hydrogen atoms to the water molecule, forming H3O+ (hydronium ion) and the HPO42- (monohydrogen phosphate) ion:

H2PO4- + H2O ⇌ H3O+ + HPO42-

This donation of a proton to water leads to the increase in the concentration of hydronium ions (H3O+) in the solution, which characterizes an acidic behavior.

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Answer:

CH4

Explanation:

The number of moles of carbon and hydrogen has been given as follows:

C = ​0.300 mol​ ​

H = ​1.20 mol

Next, we divide each mole value by the smallest (0.300)

C = 0.300 ÷ 0.300 = 1

H = 1.20 ÷ 0.300 = 4

The empirical ratio of Carbon and Hydrogen is 1:4, hence, the empirical formula is CH4

Answer:

1) Ba(OH)₂

2) The correct option is a) they conduct electricity.

Explanation:

To deduce the formula of Barium hydroxide, we have to go to the periodic table and look for the Barium (Ba), which is in group 2 and has an ionic charge of 2+. Hydroxides are not an element that is present in the periodic table is the combination of Oxygen and Hydrogen (OH), and its ionic charge is 1-.

To name this substance, we write the elements that form it, which are Ba OH, then we see the ionic charges that they have, Ba2+ OH 1- and we change these charges giving the 2+ to the OH and the 1- to the Ba. It would look Ba OH₂; we do not write the 1, and as there is a 2, the OH, has to be between brackets so that the final formula is Ba(OH)₂. What we did is balancing the charges of the elements. In other words, we need 2 OH for every Ba. Hydroxides give an electron to balance the Ba ionic charge.

Barium Hydroxide is an ionic compound because ionic compounds are formed by a metal (Ba) and a nonmetal element (OH), ionic compounds are charged, so when they are in an aqueous solution they conduct electricity because their ions move freely in the solution.                                          

Answer: owa owa

Explanation: owa owa owa owa

Answer:

99.3%

Explanation:

The percent by mass of the solute can be expressed as:

And for this problem:

So to calculate the percent by mass first we need to calculate the mass of water, to do so we use its density (1 g/L):

Density water = mass water / volume

Now we have all the data required to calculate the % mass:

Answer: 14.3

Explanation:

The molarity of the NaOH solution is approximately 0.3078 M.

To determine the molarity of the sodium hydroxide (NaOH) solution, we can use the formula:

Molarity (M) = (moles of solute) / (volume of solution in liters)

First, let's calculate the moles of potassium hydrogen phthalate (KHP) used in the titration:

Given:

Mass of KHP = 2.34 g

Molar mass of KHP = 204.22 g/mol

Moles of KHP = (mass of KHP) / (molar mass of KHP)

= 2.34 g / 204.22 g/mol

= 0.011453 mol

Next, we need to convert the volume of the NaOH solution from milliliters to liters:

Volume of NaOH solution = 37.23 ml = 37.23 cm³ = 37.23 × 10⁻³ L

Now, we can calculate the molarity of the NaOH solution:

Molarity = (moles of NaOH) / (volume of NaOH solution in liters)

Since the balanced chemical equation between NaOH and KHP is 1:1, the moles of NaOH are equal to the moles of KHP:

Molarity = (0.011453 mol) / (37.23 × 10⁻³ L)

≈ 0.3078 M

Therefore, the molarity of the NaOH solution is approximately 0.3078 M.

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Answer:

molecular number

Explanation:

because it shows exact numbers

Answer:

5 cm and 50 mm

Explanation:

1 cm = 10 mm

So 5cm = 50 mm

Direct expansion systems require the vapour exiting the evaporator to be superheated to avoid liquid slugging, to improve the effectiveness of the evaporator and to maintain the stability of the compressor. (B) Forced draft and induced draft evaporators differ in the way air is introduced into them. (C) CClF2CF3 (also known as R12) is a chlorofluorocarbon refrigerant. (ii) Tetrafluoroethane (also known as R134a) is a hydrofluorocarbon refrigerant and H2O is not classified as a refrigerant. (D) The partial pressure of hydrogen in the evaporator is 1.6 mmHg.

(a) Direct expansion systems are those in which the refrigerant in the evaporator evaporates directly into the space to be cooled or frozen. The evaporator superheat is used to make sure that only vapor and no liquid is carried over into the suction line and compressor. Superheating is required for the following reasons :

(b) Forced draft and induced draft evaporators differ in the way air is introduced into them. In an induced draft evaporator, a fan or blower is positioned at the top of the evaporator, and air is drawn through the evaporator from the top. In a forced draft evaporator, air is propelled through the evaporator by a fan or blower that is located at the bottom of the evaporator. Forced draft evaporators are frequently used in direct expansion systems because they allow for better control of the air temperature. Because the air is directed upward through the evaporator and out of the top, an induced draft evaporator is less effective at keeping the air at a uniform temperature throughout the evaporator.

(c) (i) CClF2CF3 (also known as R12) is a chlorofluorocarbon refrigerant.

(ii) Tetrafluoroethane (also known as R134a) is a hydrofluorocarbon refrigerant.

(iii) H2O is not classified as a refrigerant.

(d) The function of hydrogen gas in an absorption refrigeration system (NH3/H2O/H2) is to increase the heat of reaction between ammonia and water.

The pressure of hydrogen gas in the evaporator of an absorption refrigeration system can be determined using the formula, Pa/Pb = (Ta/Tb)^(deltaS/R),

where Pa = partial pressure of hydrogen in the evaporator, Ta = evaporating temperature, Tb = condensing temperature, Pb = partial pressure of hydrogen in the absorber, deltaS = entropy change between the absorber and evaporator, R = gas constant.

Substituting the given values, Ta = −2.0 ∘C = 271 K ; Tb = 38.0 ∘C = 311 K ; Pb = atmospheric pressure = 1 atm ;

deltaS = 4.7 kJ/kg K ; R = 8.314 kJ/mol K

we get, Pa/1 atm = (271/311)^(4.7/8.314)

Pa = 0.021 atm or 1.6 mmHg

Therefore, the partial pressure of hydrogen in the evaporator is 1.6 mmHg.

Thus, Direct expansion systems require the vapour exiting the evaporator to be superheated to avoid liquid slugging, o improve the effectiveness of the evaporator and to maintain the stability of the compressor. (B) Forced draft and induced draft evaporators differ in the way air is introduced into them. (C) CClF2CF3 (also known as R12) is a chlorofluorocarbon refrigerant. (ii) Tetrafluoroethane (also known as R134a) is a hydrofluorocarbon refrigerant and H2O is not classified as a refrigerant. (D) The partial pressure of hydrogen in the evaporator is 1.6 mmHg.

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Answer:

90.126g

Explanation:

I am going to assume that the equation is supposed to say SiO2.

We want to calculate the number of grams in 1.50 moles of SiO2.

First we must find the molecular mass of SiO2

Looking at a periodic table, the mass of Silicon(Si) is 28.086g and the mass of Oxygen(O) is 15.999g

Using this, the mass of SiO2 would be 28.086 + 15.999(2) = 60.084g

Now we can use dimensional analysis to find the number of grams in 1.50 moles of SiO2

The table created should look something like \(\frac{1.50molSiO_2}{}*\frac{60.084g}{1molSiO2}\)

the molSiO2 cancel out and we get

\(1.5*\frac{60.085g}{1}\) = 90.126g

So there are 90.126g of SiO2 in 2 moles of SiO2