A boy blows up a balloon and knots the end. He leaves it on the kitchen counter. His little sister finds it and takes it outside in the sunshine.

According to Charles's law, which of the answer choices best predicts what will happen to the balloon?

Its pressure will increase.
Its temperature will decrease.
Its volume will increase.
Its volume will decrease.

The formula of aluminum nitride is AlN

the molar mass of Al = 27 amu

the molar mass of N = 14

(1 x 27) + (1 x 14)

= 27 + 14

= 41 amu

Answer:

[tex]\boxed{\text{1. 0.47 mol; 2. 0.046 mol; 3 (a) 11.6 mol, 15.4 mol, (b) 2.31 mol, 3.08 mol, 0.770 mol}}[/tex]

Explanation:

1. Moles of Na

(a) Balanced equation

2Na + 2H₂O ⟶ 2NaOH + H₂

(b) Calculation

You want to convert moles of H₂ to moles of Na

The molar ratio is 2 mol Na:1 mol H₂

Moles of Na  = 4.0 mol H₂ × (2 mol Na/1 mol H₂) = 8.0 mol Na

You need [tex]\boxed{ \text{8.0 mol of Na}}[/tex] to form 4.0 mol of H₂.

2. Moles of LiCl

(a) Balanced equation

2LiBr + Cl₂⟶ 2LiCl + Br₂

(b) Calculation

You want to convert moles of LiBr to moles of LiCl

The molar ratio is 2 mol LiBr:2 mol LiCl

Moles of LiCl  = 0.046 mol LiBr × (2 mol LiCl/2 mol LiBr) = 0.046 mol LiCl

The reaction will produce [tex]\boxed{ \text{0.046 mol of LiCl}}[/tex].

3. Combustion of propane

C₃H₈ +5O₂ ⟶ 3CO₂ +4H₂O

(a) Moles of CO₂ and H₂O

Moles of CO₂ = 0.647 mol O₂ × (3 mol CO₂/1 mol C₃H₈) = 11.6 mol CO₂

Moles of H₂O = 3.85 mol O₂ × (4 mol CO₂/1 mol C₃H₈) = 15.4 mol H₂O

The reaction produces [tex]\boxed{ \text{11.6 mol of CO}_{2}}[/tex] and [tex]\boxed{ \text{15.4 mol of H}_{2}\text{O}}[/tex].

(b) Moles from O₂

Moles of CO₂ = 3.85 mol O₂ × (3 mol CO₂/5 mol O₂) = 2.31 mol CO₂

Moles of H₂O = 3.85 mol O₂ × (4 mol CO₂/5 mol O₂) = 3.08 mol H₂O

Moles of C₃H₈ = 3.85 mol O₂ × (1 mol C₃H₈/5 mol O₂) = 0.770 mol C₃H₈

The reaction produces [tex]\boxed{ \text{2.31 mol}}[/tex] of CO₂, [tex]\boxed{ \text{3.08 mol}}[/tex] of H₂O, and consumes [tex]\boxed{ \text{0.770 mol}}[/tex] of C₃H₈.

Answer:

[tex]\boxed{\text{6 mol}}[/tex]

Explanation:

(a) Balanced equation

2Zn + O₂ ⟶ 2ZnO

(b). Calculation

You want to convert moles of ZnO  to moles of Zn

The molar ratio is 2 mol Zn:2 mol ZnO

[tex]\text{Moles of Zn} =\text{6 mol ZnO} \times \dfrac{\text{2 mol Zn}}{\text{2 mol ZnO}} = \text{6 mol Zn}\\\\\text{You need }\boxed{\textbf{6 mol of Zn}}\text{ to form 6 mol of ZnO}.[/tex]

To make 6 moles of zinc oxide, you would need 6 moles of zinc based on the balanced chemical equation 2Zn + O2 → 2ZnO.

Yes it’s corrrct I swear

At 98.66 kPa and 20°C nitrogen has a solubility in water of .018 g/L. At 82.66 kPa and 20°C, it’s solubility is 015 g/L. Nitrogen obey the gas pressure solubility law.

Henry's Law is a gas law states that the solubility of a gas in liquid is directly proportional to the pressure of that gas.

It is expressed as:

[tex]P_{i} = K_{H}\ X_{i}[/tex]

where,

[tex]P_{i}[/tex] = Partial pressure of the gas

[tex]X_{i}[/tex] = Mole fraction of gas

[tex]K_{H}[/tex] = Henry's Law constant

Ammonia, Hydrogen halide (like Hydrochloric acid) and Hydrogen sulfide these gases does not obey Henry's Law.

Thus from the above conclusion we can say that At 98.66 kPa and 20°C nitrogen has a solubility in water of .018 g/L. At 82.66 kPa and 20°C, it’s solubility is 015 g/L. Nitrogen obey the gas pressure solubility law.

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Difference Between Chemical and Physical Weathering.

Weathering processes crack, wear away, and weaken rocks.

While physical weathering breaks down a rock's physical structure, chemical weathering alters a rock's chemical composition.

Final answer:

Physical weathering is the process of breaking down rocks without changing their chemical composition, while chemical weathering involves chemical reactions that alter the composition of rocks. Physical weathering can occur through forces like freeze-thaw cycles, while chemical weathering can happen through processes like oxidation and hydration.

Explanation:

Physical weathering, also known as mechanical weathering, is the process of breaking down rocks and minerals into smaller pieces without changing their chemical composition. This occurs through physical forces such as freeze-thaw cycles, temperature changes, abrasion, and pressure.

Chemical weathering is the process in which rocks and minerals are broken down by chemical reactions that alter their composition. This can happen through processes such as oxidation, hydration, hydrolysis, and carbonation. Chemical weathering can result in the formation of new minerals and alteration of the rock's structure.

An example of physical weathering is when water freezes in cracks in a rock, causing it to expand and eventually crack. An example of chemical weathering is the reaction between water and limestone, which leads to the formation of caves and sinkholes.

The answer is:

The temperature will be the same, 37°C.

Since from the statemet we know the first temperature, pressure and volumen of a gas, and we need to calculate the new temperature after the pressure and the volume changed, we need to use the Combined Gas Law.

The Combined Gas Law establishes a relationship between the temperature, the pressure and the volume of an ideal gas using Boyle's Law, Gay-Lussac's Law and Charles's Law.

The law establishes the following equation:

[tex]\frac{P_{1}V{1}}{T_{1}}=\frac{P_{2}V{2}}{T_{2}}[/tex]

Where,

[tex]P_{1}[/tex] is the first pressure.

[tex]V_{1}[/tex] is the first volume.

[tex]T_{1}[/tex] is the first temperature.

[tex]P_{2}[/tex] is the second pressure.

[tex]V_{2}[/tex] is the second volume.

[tex]T_{2}[/tex] is the second temperature.

Then, we are given the following information:

[tex]V_{1}=200mL\\P_{1}=4atm\\T_{1}=37\°C\\V_{2}=400mL\\P_{2}=2atm[/tex]

So, isolating the new temperature and substituting the given information, we have:

[tex]\frac{P_{1}V{1}}{T_{1}}=\frac{P_{2}V{2}}{T_{2}}\\\\T_{2}=P_{2}V{2}*\frac{T_{1}}{P_{1}V_{1}} \\\\T_{2}=2atm*400mL*\frac{37\°C}{4atm*200mL}=37\°C[/tex]

Hence, we have that the temperature will not change because both pressure and volume decreased and increased proportionally, creating the same relationship that we had before the experiment started.

The temperature will be the same, 37°C

Have a nice day!

Answer:

Pd(O₂CCH₃)₂

Explanation

Answer:

Pd(O2CCH3)2

Pd2C8H12O8

Explanation:

Given:

% Pd = 47.40

% O = 28.50

% C = 21.40

% H = 2.69

To determine:

Molecular formula of the compound containing Pd, O, C and H

Calculation:

Let the mass of the compound = 100g

Therefore based on the % compositions:

Mass of Pd = 47.40g

Mass of O = 28.50g

Mass of C = 21.40g

Mass of H = 2.69g

Atomic mass of Pd = 106.42 g/mol

Atomic mass of O = 15.99 g/mol

Atomic mass of C = 12.01 g/mol

Atomic mass of H = 1.00 g/mol

[tex]moles\ of\ Pd = \frac{47.40g}{106.42g/mol} =0.4454[/tex]

[tex]moles\ of\ O = \frac{28.50g}{15.99g/mol} =1.782[/tex]

[tex]moles\ of\ C = \frac{21.40g}{12.01g/mol} =1.782[/tex]

[tex]moles\ of\ H= \frac{2.69g}{1.00g/mol} =2.690[/tex]

Ratio:

[tex]Pd = \frac{0.4454}{0.4454} = 1.00\\\\O = \frac{1.782}{0.4454} = 4.00\\\\C = \frac{1.782}{0.4454} = 4.00\\\\H = \frac{2.690}{0.4454} = 6.039[/tex]

The empirical formula is : PdO4C4H6

Molecular formula = n(Empirical formula)

If n = 1

Molecular formula = PdO4C4H6 i.e. Pd(O2CCH3)2

If n= 2

Molecular formula = 2(PdO4C4H6)= Pd2O8C8H12

        If people are to drive less it only means fewer carbon dioxide emissions because people will save on gasoline. Similarly, it helps keep around 20 pounds of carbon dioxide out of this atmosphere thus reducing the amount of greenhouse gases. Clearly, car related emissions are the major cause of global warming.

        Change a light. Replacing one regular light bulb with a compact fluorescent light bulb will save 150 pounds of carbon dioxide a year.

        Recycling helps reduce greenhouse gas emissions by reducing energy consumption. Using recycled materials to make new products reduces the need for virgin materials. This avoids greenhouse gas emissions that would result from extracting or mining virgin materials.

The sharing electrons between atoms indicates an ionic bond is FALSE.

I hope this helps

The sharing of electrons between atoms indicates an ionic bond is option B. False.

Hence, the sharing of electrons between atoms indicates an ionic bond is False.

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Answer:

General formula of the hydrate XY.5H₂O

Explanation:

The general formula of a hydrate is given by; XY.nH₂O

Where n is the number of water of crystallization;

n = Moles of H₂O/Moles of XY

  = 0.050 Mol/0.00998 moL

  = 5.01

  ≈ 5

Therefore, the generalized formula of the hydrate is XY.5H₂O

Answer:

[tex]\boxed{\text{11.7 g}}[/tex]

Explanation:

We are given the amounts of two reactant solutions, so this is a limiting reactant problem.

We know that we will need a balanced equation with masses, moles, and molar masses, so, let's assemble our information in one place, with molar masses above the formulas and the

M_r:                                                                              234.77

                      2AgNO₃          +           CaI₂               ⟶ 2AgI + Ca(NO₃)₂

Solution: (50.00 mL, 1.00 M)    (30.00 mL, 1.25 M)

Step 1.  Calculate the moles of each reactant  

Moles of AgNO₃ = 50.00 mL × (1.00 mmol/1 mL)  = 50.00 mmol

    Moles of CaI₂ = 30.00 mL × (1.25 mmol/1 mL)  = 37.50 mmol

Step 2. Identify the limiting reactant  

Calculate the moles of AgI we can obtain from each reactant.

From AgNO₃:  

The molar ratio of AgI:AgNO₃ is 2:2.

Moles of AgI  = 50.00 mmol AgNO₃ × (2 mmol AgI/2 mmol AgNO₃)

= 50.00 mmol AgI  

From CaI₂:

The molar ratio of AgI:CaI₂ is 2:1.  

Moles of CaI₂ = 37.50 mmol × (2 mmol AgI/1 mmol CaI₂) = 75.00 mmol AgI  

AgNO₃ is the limiting reactant because it gives the smaller amount of AgI.  

Step 3. Calculate the mass of AgI.

Mass = 50.00 mmol AgI × (234.77 mg AgI /1 mmol AgI)

= 11 700 mg AgI = 11.7 g AgI

The mass of silver iodide formed is [tex]\boxed{\textbf{11.7 g}}[/tex].

Answer:

C. No shift as the reaction is in equilibrium

Explanation:

Q (the reaction quotient) and K (the equilibrium constant are equal) which means it's in equilibrium.

the answer to your question is

true

Answer: False depending on what you do or what happens to the object but true if nothing happens to it

Explanation:

Answer:

ti make gas to make things work and for stalk on the market

Explanation:

liquid is fluid in motion, needing to be contained. while a solid state of matter is as such and won't run down the cabinet

Answer:

When an element or substance is in a liquid state, the particles are joined by less attractive forces than in solids, for this reason the particles of a liquid can move freely.For this reason the particles of a liquid can move freely and need a recipient that contains them .

Liquids have a defined volume but with a variable shape, this means that liquids adopt the shape of the container but always occupy the same space

For example, if we have 4 L of water in a round container, its shape is round and now we put the water in a square container, its shape is now square but its volume is still 4 L (it continues to occupy the same space)

Answer:

[tex]\boxed{\text{D. Unbalanced force}}[/tex]

Explanation:

If a rocket is at rest or moving at a constant velocity, the forces on it are balanced.

If the engines are ignited in flight, the thrust from the propellant gases unbalances the forces, and the rocket speeds up.

A is wrong. There can't be zero net force if the rocket is accelerating.

B is wrong. There is no friction in space.

C is wrong. The forces can't be balanced if the rocket is accelerating.

Answer:

The oxygen-rich blood is then pumped out to your body through your arteries. It's bright red at this point. ... Your lips have a lot of these capillaries, which is why they're red. Your blood, now exhausted of its oxygen, is dark red as it now returns to your heart through your veins.

Explanation:

Answer:

The bright red blood leaving your heart is that color because it has more oxygen. The blood loses some oxygen and turns darker red before it returns to your heart.

Explanation:

vertical colums tell the valence and the horozontal rows tell the amount of rings that the electrons circle in.

It is easy to find this by simply looking at the Group # (these are the column numbers).

Elements in Group 1 all have 1 electron in their valence shell, Elements in group 2 have 2 and so on...

If you mean how many shells there are then look at the Period # this is the horizontal groups) the Period # corresponds with the number of electron shells.

Elements in Period 2 have 2 electron shells, elements in Period 3 have 3 and so on...

To determine the valency of an element, one must consider its position in the periodic table and its electron configuration.

The valency of an element is the number of electrons it can lose, gain, or share when forming chemical compounds.

1. Main Group Elements (Groups IA to VIIIA, except He):

- Groups IA and IIA: The group number gives the valency. For example, elements in Group IA (e.g., Na) have a valency of 1, and those in Group IIA (e.g., Mg) have a valency of 2.

- Groups IIIA to VIA: The valency can be determined by subtracting the group number from the total number of valence electrons (8 for nonmetals, 18 for noble gases). For example, Nitrogen (Group VA) has 5 valence electrons, so its valency is 8 - 5 = 3.

- Halogens (Group VIIA): These elements have 7 valence electrons, so they have a valency of 1 (since they tend to gain one electron to achieve a full valence shell).

- Noble Gases (Group VIIIA): These elements typically have a valency of 0 because they have a full valence shell.

2. Transition Metals (Groups IB to VIIIB):

- These elements can exhibit multiple valencies, often corresponding to different oxidation states. Commonly, the valency is one or two less than the group number. For example, Iron (Fe, Group VIIIB) can have valencies of 2 or 3.

3. Inner Transition Metals (Lanthanides and Actinides):

- These elements also exhibit multiple valencies, usually +3 or +4.

4. Metalloids (B, Si, Ge, As, Sb, Te):

- Their valency can vary depending on the compound they form. For example, Silicon (Si) can have valencies of 4 or -4.

To ace chemistry exams, consider the following strategies:

- Understand Concepts: Ensure you have a solid grasp of the fundamental concepts rather than just memorizing facts.

- Practice Problems: Work through a variety of problems, especially those from past exams if available.

- Study Regularly: Spread out your study sessions over time rather than cramming the night before.

- Organize Study Material: Use flashcards, charts, and diagrams to help visualize and remember information.

- Form Study Groups: Discussing concepts with peers can provide new insights and clarify misunderstandings.

- Ask for Help: If you're struggling with certain topics, don't hesitate to ask teachers or tutors for clarification.

- Stay Healthy: Get enough sleep, eat well, and stay hydrated to ensure your brain is functioning optimally.

- Manage Time During the Exam: Allocate your time wisely, answering easier questions first and returning to more challenging ones later.

By applying these strategies and understanding the principles behind chemical reactions and the periodic table, you can improve your performance in chemistry exams.

a. lawn fertilizer runoff

 Pollution as a result of lawn fertilizer runoff would be difficult to track and regulate due to the possible breadth of the area affected. Toxins can be spread throughout the land area as well as be carried downstream if near a water source. Sewer systems, rivers, lakes, ponds, etc. can all be negatively affected by lawn fertilizer runoff. Irrigation or rain water can carry toxins for many miles before the effects are detected. Tracing the source of the toxins would be difficult, especially in a highly populated area.

Lawn fertilizer runoff is a source of pollution that would be difficult to track and regulate as compared to others.

Pollution that occurs as a result of lawn fertilizer runoff would be difficult to track and regulate because of the large size of the area. Toxins present chemical fertilizer can be spread throughout the land as well as also added to the water source.

So that's why we can say that Lawn fertilizer runoff would be more difficult to track and regulate as compared to others.

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Answer:

It is options A and D.

Explanation:

Did the assignment.

Final answer:

The reliable sources from the given options are the article by the United States Geological Survey and the study published in the Journal of Medicinal Chemistry, both of which are credible due to their authoritative and scholarly quality.

Explanation:

Among the given options, the following sources are considered reliable:

Reliable sources are essential for research and credible, trustworthy, and unbiased information. These sources guarantee that the evidence and facts presented support the conclusions drawn. The USGS is a reputable government agency known for its research and the publication of scholarly articles, making it a credible source. The Journal of Medicinal Chemistry is part of the peer-reviewed academic publications, which are often published by academic institutions or associations, ensuring a rigorous process of review that adds to their credibility.

Some sources, such as a blog by a non-expert or a publicly editable encyclopedia, lack authoritative oversight and therefore are not as trustworthy. To ensure credibility, consulting multiple reliable sources is recommended, and sources like reputable newspapers, magazines, academic journals, and government publications are generally reliable.

Answer:

It dissolves into the water

Na₂SO₄ + H₂O → 2Na₊_{aq} + SO₄²-_{aq}

Hope this helps :)

Have a great day !

5INGH

Explanation:

How many were there to start off with?

The custodian receives 5 slices of pie, 7 cups of orange juice, and 11 doughnut holes as leftovers.

To calculate the leftovers for the custodian, we must first calculate how many items the students consume and subtract that from the total provided by the caterer:

Answer:

n = 5.

Explanation:

How many carbon atoms in total in this straight-chain hydrocarbon?

The prefix of the IUPAC name of a hydrocarbon (the part before -ane) shows the number of carbon atoms on the longest carbon chain.

[tex]\begin{array}{c|c}\text{Number of Carbon}\\ \text{atoms in backbone} & \text{Prefix}\\[-0.5em]\multicolumn{2}{c}{\rule{5cm}{0.5pt}}\\1& \text{meth-} \\ 2&\text{eth-} \\ 3&\text{prop-}\\4 & \text{but-}\\5 & \text{pent-} \\ 6 & \text{hex-} \\ 7 & \text{hept-} \\8 & \text{oct-}\\ \dots & \dots\end{array}[/tex].

Hence the structure:

[tex]\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_3[/tex].

All the [tex]\text{-CH}_2\text{-}[/tex] in the formula might look redundant. "[tex]\text{CH}_2[/tex]" appears five times in a row and may be condensed into [tex](\text{CH}_2)_5[/tex]. Hence the condensed formula:

[tex]\text{CH}_3\text{-}{(\text{CH}_2)_{\bf5}\text{-CH}_3[/tex].

Therefore [tex]n = 5[/tex].

Answer:

n+5 so the correct answer is b) 5

Explanation:

just did review on edge

I believe the answer is D. The ballon-like device was not used in this trial.

I am very sorry if this is not what you meant.

Answer:

It raises the boiling point and lowers the freezing point.

Explanation:

It is used as antifreeze in the cooling circuits of internal combustion engines, that is, it is used to reduce the melting point of the solution.

By adding ethylene glycol I'm not only bringing the melting point to -13°C, but the boiling point of ethylene glycol is 197°C.

since these substances not only lower the freezing point but also increase the boiling point, they are also called a colligative agent

Answer:

The correct option is A) It raises the boiling point and lowers the freezing point.

Explanation:

Consider the provided information.

Ethylene glycol is often used for convective heat transfer.

The freezing point of pure ethylene glycol is about −12° C and boils at 198° C.

Due to the higher boiling point and antifreeze properties, it is used in a vehicle’s radiator.

Therefore, the correct option is A) It raises the boiling point and lowers the freezing point.

Answer:

572 g

Explanation:

Molar mass is the mass of 1 mol of an element or compound

molar mass of Li₂SO₄ is the sum of the products of the molar masses of the elements by the number of atoms in the compound

molar masses of each element making up lithium sulphate

Li - 7 g/mol

S - 32 g/mol

O - 16 g/mol

molar mass of Li₂SO₄ - (7 g/mol x 2) + ( 32 g/mol x 1) + ( 16 g/mol x 4 )

molar mass = 110 g/mol

mass of 1 mol of Li₂SO₄ is 110 g

therefore mass of 5.2 mol of Li₂SO₄ is - 110 g/mol x 5.2 mol = 572 g

mass is 572 g

Answer:

2(Al 3+) + 3/2 O2 ---> Al2O3

Answer:

The correct coefficients for the following reaction:

[tex]4Al+3S2\rightarrow 2Al_2S_3[/tex]

Explanation:

[tex]Al+S2\rightarrow Al_2S_3[/tex]

Given reaction is not balanced.

According to Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.  

This also means that total mass on the reactant side must be equal to the total mass on the product side.

Stoichiometric coefficient is the numeral written before the chemical compound in a balance chemical reaction.

[tex]4Al+3S2\rightarrow 2Al_2S_3[/tex]

Final answer:

An ice cube has less heat energy than a cup of hot tea because the particles in the ice cube have lower kinetic energy than those in hot tea. The term 'cold energy' is not scientifically accurate; heat energy transfer is the correct concept. The correct answer is A) less heat energy.

Explanation:

An ice cube has less heat energy than a cup of hot tea. This statement aligns with the behavior of heat energy where the particles of a colder substance, like an ice cube, move much slower and thus have lesser kinetic energy compared to the particles in a warmer substance, such as hot tea. Therefore, the correct answer is A) less heat energy. The concept of 'cold energy' is not a scientific term in physics; instead, we discuss energy transfer in terms of heat. For instance, when an ice cube melts, it absorbs heat energy from its surroundings. Hence, a cup of hot tea has more heat energy, which is why it can transfer energy to the ice cube causing it to melt.

Answer:

3+

Explanation:

Boron belongs to the 3rd group, the Boron family on the periodic table. It has an atomic number of 5. For neutral atoms of Boron, we have 5 electrons in them.

All atoms lose or gain electrons in order to achieve a perfect noble gas configuration which would give them stability. Noble gases are known to be stable and unreactive.

For Boron, it would readily want to lose 3 electrons so as to mimic a Helium, He atom. Helium is the first element in the noble gas series.

When Boron loses 3 electrons, a net charge of 3+ is left on the atom of Boron.

Answer:

3

Explanation:

Since the atom has three electrons, it has a -3 electrical charge. Since atoms are neutral, 3 protons are needed to get the charge back to 0.

An atom maintains a neutral charge when it has an equal number of protons and electrons. Therefore, an atom with three electrons will have three protons. This principle is integral to the formation of ions when atoms gain or lose electrons.

An atom is characterized by having an equal number of protons and electrons, thus maintaining a neutral charge. Protons carry a positive charge and electrons a negative one. Keeping in mind that a neutral atom has an equal number of both, if an atom has three electrons, it also has three protons.

In Chemistry, we know that atoms are neutral if they contain the same number of positively charged protons and negatively charged electrons. When the counts of these particles are unequal, the atom is electrostatically charged and is called an ion. This charge is calculated as: Atomic charge = number of protons - number of electrons.

For instance, if a neutral sodium atom (Z = 11) with 11 electrons loses one, it forms a cation with a 1+ charge (11 - 10 = 1+). Conversely, a neutral oxygen atom (Z = 8) gaining two electrons becomes an anion with a 2- charge (8 - 10 = 2-).

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