Đun nóng dung dịch chứa 0,15 mol glucozơ với AgNO3 trong dung dịch NH3 (dư) thì khối lượng Ag tối đa thu được là bao nhiêu?

Reproduced, transferred their genes to progeny, died from natural causes, fell ill or contracted a disease, became prey for a predator or were devoured by a scavenger, or moved to a new area.

Non-living things include items like rocks, water, the atmosphere, the climate, and natural occurrences like earthquakes and rockfalls. One of the qualities that characterises living beings is their capacity for reproduction.

Its definition includes glass, the sun, water, sand, and rock as non-living objects. They show absolutely no signs of life. Some people define a non-living object as anything that once belonged to a live entity.

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When one mole of Na3PO4.3H2O is heated extensively, three moles of water are released.

The water molecules in Na3PO4.3H2O are called molecules of water of crystallization. These molecules are not covalently bonded to the Na3PO4 molecule. They are only loosely attached to the substance.

Strong heating will drive away these molecules of water of crystallization to give three moles of water in the product.

Hence, when one mole of Na3PO4.3H2O is heated extensively, three moles of water are released.

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Explanation:

use to describe something that is complete opposite

The wavelength of the light fired in the world’s most powerful laser is 37×10⁻¹⁰ nm.

A laser is a device that produces a coherent light beam through optically amplification.

The given data is

Energy = time × power

Energy = 25 ×  30

Energy = 750 J

Photons = 7.5 x 10²⁰

Then the formula is λE =hc

where E = energy,

           h = plank constant,

           c= speed,

           λ = wavelength

wavelength calculation is,

λ = hc / E

λ = 6.62×10⁺³⁴×7.5 x 10²⁰ ×750 J

λ = 37×10⁻¹⁰ nm

The wavelength of the laser is 37×10⁻¹⁰ nm.

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The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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Answer: D. 7.71 x 10^24

Explanation:

12.8 moles CO2 (6.02 * 10^23 molecules / 1 mol) = 7.7 * 10^24 molecules :)

Answer:

B

CuO

H2

Explanation:

hydrogen will oxidized to form water

Copper(II) oxide reacts with hydrogen.

\(CuO + H_2\) → \(Cu + H_2O\)

Oxidising agent - \(Cuo\)

Reducing agent - \(H_2\)

A chemical reaction that takes place between an oxidizing substance and a reducing substance.

The oxidizing substance loses electrons in the reaction, and the reducing substance gains electrons.

In the reaction  \(CuO + H_2\) → \(Cu + H_2O\)  

\(Cuo\) is the oxidising agent and  \(H_2\) is the reducing agent because \(Cuo\)  is oxidising  \(H_2\) and \(H_2\) is the reducing agent because it is removing oxygen from \(Cuo\).

Hence, option B is correct.

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Answer:

The number of outer shell electrons determines the group number of the element. The number of occupied principle quantum shells (energy levels) determines the period of the element. The proton number determines the element itself and its position.

Explanation:

The distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.

The distance between two points is calculated using the following equation.

for a given points (x1, y1), (x2, y2), the distance, d is;

d = √[(x2-x1)² + (y2 - y1)²]

From the given question;

x1 = 8, y1 = -5

x2 = 1, y2 = 1

distance = √[(1-8)² + (1 - -5)²]

distance = √[(-7)² + (16)²]

distance = 9.22 units

Thus, the distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.

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Answer:

0.00025 mole

Explanation:

The number of moles of a substance can be mathematically derived from the following formula

1. mass of substance (in grams)/molar mass of substance (in grams/mole)

2. molarity of substance (in mol/dm3) x volume of substance (in dm3)

In this case, the molarity and volume of NaOH are provided, hence, the second formula will be applicable.

2.5 mL of NaOH was used = 0.0025 dm3

Number of mole of NaOH that was used to neutralize the river water:

  = 0.1 x 0.0025 = 0.00025 mole

The number of mole of NaOH used to neutralize the river water is 0.00025 mole.

Answer:

Explanation:

Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. The ground state of an atom is the lowest energy state of the atom.  

Hope this helps and mark brainlest i only have 1 :(

Valence electrons are the electrons in the outer shell of the atom, with the highest level of energy and that is where all of the chemical reactions and fun things happen.

The equilibrium constant expression for this system is Keq=[NH3][H2S]

The ratio of the equilibrium concentrations of the products to the concentrations of the reactants raised to their respective powers to match the coefficients in the equilibrium equation is K for a system in equilibrium, according to the law of mass action. The equilibrium constant expression is known as the ratio.

Therefore, the equilibrium constant expression for this system is Keq=[NH3][H2S]

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Rutherford's model of the atom differed significantly from earlier models, such as Dalton's atomic theory. Here are some of the key differences:

Structure of the atom: Dalton's atomic theory proposed that atoms were indivisible, solid spheres. In contrast, Rutherford's model suggested that atoms had a complex structure consisting of a dense, positively charged nucleus at the center, surrounded by negatively charged electrons orbiting around it.

Charge of the nucleus: Dalton's model had no concept of a nucleus, so it did not address the charge of the center of the atom. Rutherford's model, on the other hand, proposed that the nucleus had a positive charge, which was responsible for the electrostatic attraction that kept the negatively charged electrons in orbit.

Size of the atom: Dalton's model did not propose a specific size for atoms. Rutherford's model, however, suggested that atoms were much smaller than previously believed, with most of the mass concentrated in the nucleus, which was thousands of times smaller than the overall size of the atom.

Experimental evidence: Rutherford's model was based on experimental evidence from his famous gold foil experiment, in which he shot alpha particles at a thin sheet of gold foil and observed how they were deflected. This provided direct evidence for the existence of a small, positively charged nucleus at the center of the atom. In contrast, Dalton's model was based more on theoretical considerations and did not rely as heavily on experimental evidence.

Rutherford's model of the atom differed from Dalton's model in several key ways, including its proposed structure, charge, size, and the experimental evidence used to support it. Rutherford's model represented a major advance in our understanding of the atom and provided a framework for later developments in atomic theory.

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This notation is useful in representing very small numbers in a compact and efficient way.

The exponential notation is a very useful way of representing numbers that are very large or very small. One example is when we need to represent numbers that are less than one. This is where the concept of negative exponents comes in. Here, we will discuss how the number 10 raised to the power of negative 9 is expressed in exponential notation.The number 10 raised to the power of negative 9 is written as 10⁻⁹ in exponential notation. This means that the number 10 is raised to the negative 9th power. Let's break down this expression to better understand what it means.In exponential notation, when a number is raised to an exponent, it means that the base number is multiplied by itself as many times as the exponent indicates. For example, 10² means 10 x 10 = 100, because 10 is multiplied by itself 2 times.10⁻⁹ means that 10 is raised to the negative 9th power. When a number is raised to a negative exponent, it is equivalent to 1 divided by the number raised to the corresponding positive exponent. So, 10⁻⁹ is equivalent to 1/10⁹ or 0.000000001.In summary, 10⁻⁹ means that the number 10 is raised to the negative 9th power, which is equivalent to 1 divided by 10⁹ or 0.000000001.

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Answer:

Yes, A  toothpick can be a good model for showing the strength and brittleness of salt as It will break and splinter just like salt.

What are the properties of  salt ?

Salts are ionic in nature due to the presence of ions.

They are brittle, hard and crystalline solids.

Salt is white, odorless and it has a salty taste.

Toothpick will break and splinter just like salt, exclamation, because it breaks easy and if we use a hammer on a tooth pick its gonna break and splinter just like salt.

Therefore , A  toothpick can be a good model for showing the strength and brittleness of salt as It will break and splinter just like salt.

Explanation: hope this helps

If she suddenly feels terrified and thinks she is going to faint, it sounds like Dana may be experiencing panic attacks.

Panic attacks can be triggered by a variety of things, such as stress, anxiety, or even physical sensations. During a panic attack, the body's fight or flight response is activated, causing symptoms such as a rapid heart rate, shortness of breath, and a feeling of impending doom.

It's important for Dana to seek medical attention to rule out any underlying medical conditions, and to speak with a mental health professional to address any anxiety or stress that may be contributing to her panic attacks. There are treatments available, such as therapy and medication, that can help manage and reduce the frequency of panic attacks.

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The number of moles of the gas is about 1.37 moles.

The ideal gas equation relates the pressure, volume, temperature, and number of moles of an ideal gas in a closed system. The gas constant (R) is a proportionality constant that relates these four variables.

It is important to note that the ideal gas equation is only applicable to ideal gases, which are hypothetical gases that obey certain assumptions such as having no intermolecular forces and occupying no volume. Real gases deviate from these ideal behaviors under certain conditions, and thus the ideal gas equation may not accurately describe their behavior.

Knowing that;

PV = nRT

n = PV/RT

n = 1.35 * 25/0.082 * 300

n = 33.75/24.6

n = 1.37 moles

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Anion structures can affect the thiophene distribution between imidazolium-based ionic liquid and hydrocarbon phases by one of the most important classes of ionic liquids.

The packing strategies we just mentioned for metals may be used to characterise the structures of the majority of binary compounds. To achieve this, we often concentrate on how the biggest species present are arranged in space. This often refers to the anions in ionic solids, which are typically organised in a simple cubic, bcc, fcc, or hcp lattice.

The anions are not directly in contact with one another since the cations are big enough to prop them apart considerably, hence the anion lattices are frequently not genuinely "close packed". The cations often occupy the "holes" between the anions in ionic compounds, balancing the negative charge. To establish electrical neutrality, a unit cell's ratio of cations to anions must be equal to or greater than that of the bulk stoichiometry of the compound.

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Answer:

lol choice B

Explanation: l

B or A

There are 2.6 moles HCl are needed to react with 0.87 mol of Al.

The mole would be an equivalent to Avogadro's number in terms of chemistry units.

HCl is a mixture of hydrogen and chlorine .

The reaction between the HCl and Al is shown as:

Al + HCl → AlCl3 + H2

By balancing the above equation.

2Al + 6HCl → 2AlCl3 + H2

It can be seen that there are 2 mole Al will be reacted with 6 mole of HCl hence, 0.87 mole Al will be react with 2.6 mole of HCl.

Therefore, there are 2.6 moles HCl are needed to react with 0.87 mol of Al.

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Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.

Answer:

Explanation:

I'll answer question 3 for you.   But just ask one question at a time.

it's really not fair to ask a bunch of questions.

so for 3 we know it's hydroCarbons.   or \(H_{2}\)    b/c of how Hydrogen is diatomic, C , for Carbon.    Next, we know 8 Carbon atoms have attached themselves.  so do you happen to know the Lewis diagram for Hydrogen and Carbon?  look it up if not.   so we know Carbon is 6 on the periodic chart,  so it's normally got 6 electrons.   I mentioned Lewis structures b/c now you have to picture how the electrons are going to "stick"  the atoms together.   Recall they like to be in groups of 8  :P  so the diatomic Hydrogen is going to stick to one Carbon atom well.  Also, Hydrogen is never the central atom,  it just "hangs around"  :DD    , so I added a picture of the Lewis structure for  8 carbon atoms,   but, you can see there are double bond connections and the question you asked doesn't say if those are allowed.  I feel like the professor has misguided you in this question.  b/c  HydroCarbons come in a big variety of complex connections,  so almost any answer would be correct.   but probably 16 is good.  but that's not even an option.   Maybe they just want you to recognize that Hydrogen is diatomic and comes in twos.   so maybe 10 is the best answer.  or   A)

The VSEPR model explains that each atom in a molecule with a central atom will achieve a geometry of the molecule which minimizes the repulsion between electrons of the molecule in the valence shell of that atom.

VSEPR Model can be used to predict the structure of any molecule with a central metal atom present in it. In the polyatomic molecules which is the molecules made up of three or more atoms and one of the constituent atoms is determined as the central atom to which all other atoms belonging to the molecule are linked together.

VSEPR theory explains five main shapes of simple molecules consisting the central atom. Those five structure basically are linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral geometry. Using the VSEPR theory, we predict that the electron bond pairs and lone pairs on the center atom will help us to predict the shape of a central atom of a molecule. Using this theory the shape of a molecule is determined by the location of the nuclei and its electrons of the molecule.

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Answer:

fractional distillation

Explanation:

The greatest wavelength at which a photon may get ionized is 2.294 107 nm. When an atom or molecule acquires or eliminates an energy, the activity of ionization creates ions.

The ionization energy rule is what?

Upon that annual chart, that the very first oxidation number typically climbs towards left to right for each period. The higher nuclear charge results in a closer bond between the outermost electron and the nucleus.

How does ionization work?

Any process by which electrically neutral atoms or molecules are changed into electrically charged atoms or molecules (ions) by the gain or loss of electrons is referred to as ionization in chemistry and physics.

Briefing:

ionization energy= 941kj/mol

ionization energy= 941×1/6.022×10²³

                            =15.62×10⁻²²kj/atom

              E=h∨

               v=15.62×10⁻²²×10³/6.626×10⁻³⁴

                =1.3075×10¹⁰s⁻¹

           λν=c

                  λ=3×10⁸/1.3075×10¹⁰

                   =2.294×10⁻²m

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Answer: In liquid water, water molecules are moving faster. They are still close together, but they are no longer stuck in a rigid pattern as they are in ice. Water molecules in liquid water are constantly sliding past and bumping into each other; they keep moving from one place to another.

Answer:

they are different forms

Explanation:

ice is solid

and water is liquid

they also have different densities

The process of chemicals released from human activity interacting with the atmosphere to form acid rain occurs primarily in the troposphere, the lowest layer of the atmosphere.

Chemicals released into the air from human activities, such as sulfur dioxide (SO2), carbon dioxide (CO2), and nitrous oxide (N2O), undergo various reactions in the atmosphere. These chemicals primarily interact with atmospheric components in the troposphere, the lowest layer of the atmosphere.

When released, sulfur dioxide (SO2) reacts with other atmospheric gases, such as oxygen and water vapor, to form sulfuric acid (H2SO4).

Carbon dioxide (CO2) and nitrous oxide (N2O) do not directly form acid rain but contribute to the overall acidity of rain through their role in the greenhouse effect, which leads to changes in rainfall patterns and alters the chemical balance in the atmosphere.

Ultimately, these chemical reactions and interactions take place in the troposphere, where weather processes occur and the majority of Earth's human activities and pollution emissions take place.

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Answer:

Light waves change speed when they pass across the boundary between two substances with a different density , such as air and glass. This causes them to change direction, an effect called refraction .

Answer:

a) Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺

b) Sr > Fr > Eu > Y

Explanation:

Y is the least reactive metal because it does not react with any of the other solutions.

Sr is the most reactive metal because it reacts with all of the other solutions.  

Sr + 2Fr⁺ ⟶Sr²⁺ + 2Fr

3Sr + 2Y³⁺ ⟶ 2Sr²⁺ + 2Y

Sr + Eu²⁺ ⟶ Sr²⁺ + Eu

Fr is more reactive than Eu because it reacts with Eu(NO₃)₂.

2Fr + Eu²⁺ ⟶ 2Fr⁺ + Eu

The order of reactivity is

Sr > Fr > Eu > Y

b) Reducing agents

In each of the above reactions. the more reactive metal is acting as a reducing agent — it is donating electrons to the cation of the other metal.

Thus, the order of activity of reducing agents is

Sr > Fr > Eu > Y

a) Oxidizing agents

The metal cations are the oxidizing agents.

The order of reactivity of the oxidizing agents is the reverse order of the reducing agents

Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺

c) Standard reduction potential table

See the image below.