An electron in the hydrogen atom makes a transition from an energy state of principal quantum numbers into the n=2 state. If the photon emitted has a wavelength of 434 nm, what is the value of ni? (RH = 2.18 X 10-18 J)

Answer:

option c is the correct one, we add some number like 2,3 or 4 in front of the reactant or product to make the number of the element(s) equal on both the product and reactant side

This extremely high temperature indicates that under normal conditions, you do not need to worry about your car tire bursting from overheating as it is unlikely to reach such extreme temperatures.

To determine the temperature at which the tire will burst, we can use the ideal gas law equation:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for temperature, we have:

T = PV / (nR)

Given that the pressure threshold for bursting is 1.4 x 10^3 kPa, the volume is 30 L, and the number of moles of air is 2.5 mol, we can substitute these values along with the ideal gas constant R = 8.314 J/(mol K) into the equation.

T = (1.4 x 10^3 kPa) * (30 L) / (2.5 mol * 8.314 J/(mol K))

Converting kPa to Pa and L to m^3, and simplifying the equation, we find:

T ≈ 20,993 K

This extremely high temperature indicates that under normal conditions, you do not need to worry about your car tire bursting from overheating as it is unlikely to reach such extreme temperatures.

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Mangrove trees' robust roots aid in stabilizing the soil and preventing soil erosion. This is especially crucial in swampy coastal locations, where the soil is frequently loose and prone to wind and wave erosion. Mangrove trees work to stabilize the coastline and stop land erosion by securing the soil in place.

Mangrove trees also aid in removing contaminants from the water, enhancing the quality of the water in coastal areas while serving as an essential home for a variety of wildlife species. Mangrove trees contribute significantly to environmental protection and are an essential component of coastal ecosystems.

Mangrove trees are crucial for environmental preservation because they hold the soil in place and stop erosion in marshy coastal areas. They also provide crucial habitats for numerous wildlife species, stabilize the coastline, and stop the land from being lost to erosion while enhancing water quality by filtering pollutants from the ocean.

Mangrove trees are an essential part of coastal ecosystems overall, and preserving them is essential for preserving a healthy and sustainable environment.

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Answer:

I believe the ans is FeO and Cl2

Answer:

\(\boxed {\boxed {\sf FeO and Cl_2}}\)

Explanation:

In a chemical reaction, there are reactants and products.

The reactants are the substances at the beginning of the reaction. They go into the reaction and are changed.

The products are the substances created in the reaction and what you end up with after the reaction.

In an equation, the reactants are to the left of the arrow and the products are to the right.

Let's look at the equation given:

\(2FeO+ 2Cl_2 \rightarrow 2FeCl_2+O_2\)

FeO and Cl₂ start the reaction and are to the left of the arrow, so they must be the reactants.

Answer:

answer number C is the correct answer for this

Answer:

5

Explanation:

To research some substances pH 0 to less than 7 is acidic, 7 is neutral and more than 7 is neutral.

baking soda - base

Vinegar - acid

Distilled water - neutral

Pure rain - neutral

Ammonia -  nasic

Lemon juice -  acid

Hair and skin - acidic

An acid is a molecule or ion capable of both donating a proton, referred to as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. the first class of acids are the proton donors, or Brønsted–Lowry acids.

An acid is any substance that in water answer tastes sour, adjusts blue litmus paper to red, reacts with a few metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis). An acid is a substance that produces hydrogen (H+) ions when it's far delivered to water. A hydrogen ion is simply the proton and no electron

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Answer:

q = 346.5 J

Explanation:

c (specific heat capacity) = 0.90 J/gx°C

ΔT (change in temperature) = 55 - 20 = 35°C.

m (mass in grams) = 11g

q (heat in joules) = ?

q = mcΔT

q = (11g) (0.90 j/gx°c) (35°C)

q = 346.5 J

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Answer:

C2H8N

Explanation:

Hello there!

In this case, since the molecular formula is the complete representation of the considered chemical compound and the empirical one is the smallest possible whole-numbered representation of the former, we infer that the ratio of the molar masses of these two provides the times in which the empirical formula is within the molecular one; for that reason, we first compute the molar mass of the empirical formula:

\(MM_{empirical}=12*2+8+14=46g/mol\)

Thus, since the ratio is 46/46=1, we infer that the molecular formula is also C2H8N.

Best regards!

Answer:

I think the answer is X

Explanation:

X is a variable and variables stand for the unknown

The solubility of\(LaF_3\) in water is 3.04 x 10^-6 mol/L.

The solubility of \(LaF_3\) in water can be determined using the Ksp expression:

\(Ksp = [La^{3+}][F^-]^3\)

Where \([La^{3+}]\)and \([F^-]\) are the molar concentrations of the \(La^{3+}\) and \(F^-\) ions in the solution.

Since each \(LaF_3\) formula unit dissociates into one \(La^{3+}\) ion and three \(F^-\) ions, the molar solubility of \(LaF_3\) can be represented as x. Thus, the molar concentrations of \(La^{3+}\) and \(F^-\) ions in the solution can be written as x and 3x, respectively.

Substituting these values into the Ksp expression gives:

Ksp = x*(3x)^3 = 27x^4

Now, we can solve for x:

x = (Ksp/27)^(1/4)

= (2 x 10^-19 / 27)^(1/4)

= 3.04 x 10^-6 mol/L

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Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

This means that at least 39 ideal stages are required to achieve a 95% separation efficiency of acetone from nitrogen in a countercurrent tray tower.

Countercurrent is a process in which two fluids flow in opposite directions at the same time. This process occurs in nature and is also used in some industrial processes. In nature, countercurrent flow is used to transfer heat and other materials between two streams.

The first step in determining the number of ideal stages necessary for the separation is to calculate the minimum number of stages required to achieve the desired separation efficiency. The minimum number of stages can be calculated using the Murphree efficiency equation, which is given by:
Nmin = (1-X)/(Y-X)
Where X is the mole fraction of acetone in the feed, and Y is the equilibrium mole fraction of acetone in the water.
For this problem, the mole fraction of acetone in the feed is 0.015, and the equilibrium mole fraction of acetone in the water is 2.53. Plugging these values into the Murphree efficiency equation gives:
Nmin = (1 - 0.015) / (2.53 - 0.015) = 38.7
Since the minimum number of stages must be a whole number, we can round up to 39 stages. This means that at least 39 ideal stages are required to achieve a 95% separation efficiency of acetone from nitrogen in a countercurrent tray tower.

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Bending a straw is not a good model for showing the malleability of iron because it is not a metal.

Malleability is property by virtue of which a material can be extended in all directions without rupture by the application of load.

In simpler terms, malleability is a material's ability to be bent, formed, or shaped without cracking or breaking.

Malleability is a unique property of metals and according to this question, iron is malleable because of the type of bond between the atoms.

This suggests that bending a straw is not a good model for showing the malleability of iron because it is not a metal.

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Answer:

Explanation:

Bending a straw is not a good model for showing the malleability of iron because it is not a metal.

What is malleability?

Malleability is property by virtue of which a material can be extended in all directions without rupture by the application of load.

In simpler terms, malleability is a material's ability to be bent, formed, or shaped without cracking or breaking.

Malleability is a unique property of metals and according to this question, iron is malleable because of the type of bond between the atoms.

This suggests that bending a straw is not a good model for showing the malleability of iron because it is not a metal.

Answer: C

Explanation:

In endothermic reactions, enthalpy is positive, and in exothermic reactions, enthalpy is negative, So, if enthalpy is positive, then it is an endothermic reaction, and hence is required for the reaction to occur.

The root mean square velocity of gaseous xenon atoms at 25°C is 56.6 m/s.

The Vrms velocity is directly proportional to the square root of temperature and inversely proportional to the square root of molar mass.

To calculate the root mean square velcoity of gaseous xenon, we use the formula below.

Formula:

Where:

From the question,

Given:

Susbtitute these values into equation 1

Hence, the root mean square velocity is 56.6 m/s.

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The desired compound should be soluble in hot solvent.

Recrystallization is a process to purify chemicals in chemistry. First we mix the compound with the impurity then we purify it again by using recrystallization method. The normal procedure is to dissolve the substance to be purified in a suitable solvent, at a very high temperature, to form an almost saturated solution. It is then allowed to cool so that the dissolved substance crystallizes out. The principle behind recrystallization is that the amount of solute that can be dissolved by a solvent increases with temperature. In recrystallization, a solution is created by dissolving a solute in a solvent at or near its boiling point.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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The value of ΔG at 25 °C for the given reaction is: ΔG = -370.4 kJ/mol + 0 = -370.4 kJ/mol So, the correct answer is -370.4 kJ/mol

To determine the value of ΔG (Gibbs free energy) at 25 °C for the given reaction:

25 (s, rhombic) + 3/2 \(O_2\)(g) → \(2SO_3\)(g)

We can use the equation:

ΔG = ΔG° + RT ln(Q)

where:

ΔG is the standard Gibbs free energy change

ΔG° is the standard Gibbs free energy change under standard conditions

R is the gas constant (8.314 J/(mol·K) or 0.008314 kJ/(mol·K))

T is the temperature in Kelvin (25 °C = 298 K)

Q is the reaction quotient, which is the ratio of the concentrations of the products to the concentrations of the reactants at a given point during the reaction.

Given that ΔG° is -370.4 kJ/mol, we can plug the values into the equation:

ΔG = -370.4 kJ/mol + (0.008314 kJ/(mol·K) * 298 K) * ln(Q)

Now, we need to determine the value of Q. Since all reactants and products are in their standard states, Q = 1, as their concentrations are taken to be 1.

ΔG = -370.4 kJ/mol + (0.008314 kJ/(mol·K) * 298 K) * ln(1)

Since ln(1) = 0, the term (0.008314 kJ/(mol·K) * 298 K) * ln(1) becomes 0.

Therefore, the value of ΔG at 25 °C for the given reaction is:

ΔG = -370.4 kJ/mol + 0 = -370.4 kJ/mol

So, the correct answer is -370.4 kJ/mol.

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Hi There!

Black powder is an explosive powder consisting of saltpeter, sulfur, and charcoal, used chiefly in old guns fired for sport, in fireworks, and for spotting charges in practice bombs; black gunpowder.

In addition to being easily ignited by friction and impact, black powder is also extremely sensitive to flame and spark. It ignites violently when unconstrained and explodes when lit in even the slightest amount of confinement.

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Eddie

water is known as the mixture

Answer:

iv. Iron

water is not a mixture

hydrogen is the simplest element

air is pure

Answer:

1.60 g of Fe₂O₃

Explanation:

We'll begin by calculating the number of mole water that reacted. This can be obtained as follow:

Volume (V) = 6.50 L

Temperature (T) = 50.2 °C = 50.2 + 273 = 323.2 K

Pressure (P) = 0.121 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) =?

PV = nRT

0.121 × 6.5 = n × 0.0821 × 323.2

0.7865 = n × 26.53472

Divide both side by 26.53472

n = 0.7865 / 26.53472

n = 0.03 mole

Thus, 0.03 mole of water reacted.

Next, we shall determine the number of mole of Fe₂O₃ produced from the reaction. This can be obtained as follow:

2Fe + 3H₂O —> Fe₂O₃ + 3H₂

From the balanced equation above,

3 moles of H₂O reacted to produce 1 mole Fe₂O₃.

Therefore, 0.03 mole of H₂O will react to produce = (0.03 × 1)/3 = 0.01 mole of Fe₂O₃.

Thus, 0.01 mole of Fe₂O₃ was produced from the reaction.

Finally, we shall determine the mass of 0.01 mole of Fe₂O₃. This can be obtained as follow:

Mole of Fe₂O₃ = 0.01 mole

Molar mass of Fe₂O₃ = (56×2) + (16×3)

= 112 + 48

= 160 g/mol

Mass of Fe₂O₃ =?

Mass = mole × molar mass

Mass of Fe₂O₃ = 0.01 × 160

Mass of Fe₂O₃ = 1.60 g

Therefore, 1.60 g of Fe₂O₃ were produced.

Answer:

is this for science or another class?

Answer:

Water is peace. They include sedimentation, pollution, climate change, deforestation, landscape changes, and urban growth. ... Each type of change to a landscape will have its own specific impact, usually directly on natural ecosystems and directly or indirectly on water resources.

Explanation:

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

Answer:

HCO3- (aq) + H2O (I) <--> H2CO3 (aq) + OH- (aq)

Explanation:

The equation to distinguish between cation and anion hydrolysis is given below :  

HCO3- (aq) + H2O (I) <--> H2CO3 (aq) + OH- (aq)

The important thing to remember is their origin. The anions can react with water and can produce hydroxide ions while hydroxide ions make a solution basic.

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

When most substances lose or gain energy, one of two things happens to the substance: its temperature changes or its state changes. The temperature of a substance is related to the speed of the substance’s particles. So, when the temperature of a substance changes, the speed of the particles also changes. But the temperature of a substance does not change until the change of state is complete.

Explanation:

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The correct statement is one person performs the work in less time than the other.

Power is a measure of the rate at which work is done. It is calculated by dividing the amount of work done by the time taken to do the work.

P = E/t

where;

Therefore, if two people are moving boxes into a moving truck, the person who moves more boxes in a shorter amount of time has more power than the other person.

Thus, the correct statement will be "One person performs the work in less time than the other" which best explains how one can have more power than the other.

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Answer: The scientific concept or theory behind the detection of organic material in rocks is biogeochemistry. This field of science studies how chemical elements, such as carbon, nitrogen, and sulfur, move through different biological, geological, and environmental systems. In this context, biogeochemistry helps scientists to identify when oxygen first appeared on Earth by looking at the presence of organic material in rocks and sediment.

By examining organic materials in rocks, biogeochemical analysis can identify sedimentary patterns in the Earth's layers. These patterns allow scientists to draw conclusions about when oxygen was first produced in the atmosphere. For example, scientists can detect traces of sulfur and other organic material in the oldest rocks on Earth, which can help pinpoint the timeframe of when oxygen first was present.

Biogeochemistry can also help scientists to uncover more specific details about when oxygen appeared on Earth. By examining the organic material in rocks from different regions, scientists can map out when and where different levels of oxygen were produced. This allows scientists to draw more precise conclusions about when oxygen levels rose enough for life to emerge. Additionally, by analyzing the types of organic material found in rocks from different times, scientists may be able to distinguish which organisms were first in the atmosphere.

Biogeochemistry can also help inform us about the evolution of life and the environment. By studying the organic material found in a variety of rocks and sediment, scientists can gain a better understanding of how different environments have changed over time. This type of information can help scientists to better understand how climate change and other environmental factors have impacted the planet throughout history.

Explanation: