how many moles of oxygen react with 12 moles of aluminum

Answer:

0.75g

Explanation:

From the given problem, the known parameters are:

Number of mole of BeO = 0.03mole

The unknown is the mass of BeO = ?

The formula of the compound is BeO

To solve this kind of problem, we use the mole relationship between number of mole and mass. This is expressed below mathematically:

          Mass of BeO = number of moles of BeO x Molar mass of BeO

The molar mass of BeO:

Atomic mass of Be = 9g

Atomic mass of O = 16g

Molar mass of BeO = 9 + 16 = 25g/mol

Mass of BeO = 0.03 x 25 = 0.75g

The mass of BeO that participates is 0.75g

The mass of Beryllium oxide that participates in the chemical reaction is 0.7506 grams.

To calculate the mass of Beryllium oxide that participates in the chemical reaction, we need to convert the given amount of moles to grams. The molar mass of Beryllium oxide (BeO) is 25.02 g/mol. Since we know that 0.0300 moles of BeO participate in the reaction, we can use the formula:

Mass = moles × molar mass

Mass = 0.0300 mol × 25.02 g/mol = 0.7506 g

Therefore, the mass of Beryllium oxide that participates in the chemical reaction is 0.7506 grams.

independent variable is temperature and dependent is the number of cold drinks sold. It's because the temperature is being changed without any outer influence while the number of cold drinks sold changes based on the weather. It's like cold drinks are going to sell better in the summer because it's hot vs in the winter because it's cold. The change in temperature isn't relying on anything but the drink is.

Answer:

the answer would be B.20n-->X<--20n

Explanation:

the amount of force is equal and balances out each other forming an equilibrium

Answer:

The answer is B (sodium is more reactive)

Explanation:

The lesser reactive element to magnesium is present on the left side of the magnesium in the periodic table in the same row. Thus, option B is correct.

The periodic table is given as the arrangement of the elements in columns and rows based on the increasing order of the atomic number and the number of valence electrons.

In a periodic table, on moving from left to right reactivity increases, and from top to bottom reactivity decreases.

Thus, the element with the lesser reactivity than magnesium is present in the left of the magnesium in the same row. Thus, option B is correct.

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Answer:

Red Giant

Explanation:

The stage in which a typical star has completely stopped fusion is called the  Red Giant.

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Final answer:

A star stops fusion at the end of its lifecycle, becoming a white dwarf. Fusion of iron in the core requires energy, leading to the star's demise. Eventually, the white dwarf may explode as a type Ia supernova.

Explanation:

The stage in which a typical star has completely stopped nuclear fusion marks the end of its life cycle. After a star consumes all its hydrogen and goes through subsequent stages fusing heavier elements, it eventually reaches a point where further fusion is not energetically favorable. For example, the fusion of iron actually requires energy, signaling a catastrophic end for any star that reaches this stage.

A typical example of such an end state is when a star becomes a white dwarf. This occurs when all nuclear fusion has ceased within the star's interior, and it's stabilized by degeneracy pressure. The white dwarf represents the cooling cinder of a once vibrant star. Despite a brief resurgence of fusion in its outer layers that consume any remaining hydrogen, the star has effectively 'died' in terms of its stellar lifecycle. Over time, it may succumb to a violent end and be destroyed by a type Ia supernova, especially if it accumulates additional material from a companion star.

To calculate the molarity of the diluted H₂SO₄ solution, first find the mass of H₂SO₄ in the initial solution. Convert this mass to moles and divide by the final volume in liters. The resulting molarity is 1.194 M.

To find the molarity of the diluted sulfuric acid solution, follow these steps:

Calculate the mass of H₂SO₄ in the initial solution:
A 40% H₂SO₄ solution means there are 40 grams of H₂SO₄ in every 100 grams of solution. The density of the stock solution is 1.17 g/mL, so 250 mL of stock solution weighs :

250 mL × 1.17 g/mL = 292.5 g.
Mass of H₂SO₄: 40% of 292.5 g = 0.40 × 292.5 g = 117 g H2SO4.

Calculate the moles of H₂SO₄:
Molecular weight of H₂SO₄ (H: 1 g/mol, S: 32 g/mol, O: 16 g/mol) = 2(1) + 32 + 4(16) = 2 + 32 + 64 = 98 g/mol.
Moles of H₂SO₄

= 117 g ÷ 98 g/mol

= 1.194 moles of H₂SO₄.

Determine the volume of the final solution in liters:
The final volume is given as 1 liter.

Calculate the molarity:
Molarity (M)

= moles of solute ÷ liters of solution

= 1.194 moles ÷ 1 liter

= 1.194 M.

Therefore, the molarity of the diluted H₂SO₄ solution is 1.194 M.

Answer:

N=+2

O=-2

Explanation:

The compound NO is electrically neutral.

Lets assign the oxidation number of nitrogen to be N. The oxidation number of oxygen (-2) is then used as a reference.

For the compound to have a zero charge,  sum of the oxidation numbers equals zero.

N+ (-2)=0

N=+2

O=-2

That would be a description of a solid if that’s what your looking for. If not ask me in the comments:)

Particles vibrate in a rigid structure and do not move relative to their neighbours. It is the property of solid.

A solid is a state of matter that retains its shape and density when not confined.

Properties of solids: Solids have definite volume and shape.

Hence, particles vibrate in a rigid structure and do not move relative to their neighbours.

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Answer:

B. 2358.1

Explanation:

142×16.5=2343

ans+15.11=2358.2

Answer: A. 2,358

Look at the image below.

This is a significant figures calculator.

Answer:

Amount of oxygen = 2 * 5.43 moles

                             = 10.86 moles

Explanation:

Answer:Correct answer 10.9

Explanation:

Answer:

the 3rd option for make sense,so that's out

Dalton was the pioneer behind the atomic model,but he certainly didn't believe in the nucleus or electrons,much lest electron shells.

Chadwick's discovery was the discovery of the neutron,not electron energy levels.

Niels Bohr's model was an attempt at explaining the hydrogen atom's spectrogram,followed by Erwin Schrödinger.Thus the first option is the answer

Niels Bohr's model of the atom, which posits electrons in fixed energy levels, was supported by observations of the hydrogen atomic spectrum. This spectrum showed distinct lines corresponding to electron transitions, which corroborated Bohr's theory that electrons occupy specific allowed orbits.

Niels Bohr, a Danish physicist, introduced a groundbreaking model of the atom in 1913. Central to Bohr's model was the concept that electrons move in definite orbital paths around the nucleus with specific allowable energy levels, which he referred to as stationary states. This idea was demonstrated using the hydrogen atomic spectrum as evidence, where the emitted light could be seen as distinct lines, each corresponding to an electron moving between these fixed energy levels.

In Bohr's theory, each energy level is quantized, meaning electrons can only occupy certain regions of space at certain energy levels. The electron can jump from one energy level to another, but it does not emit or absorb energy while staying in a given energy level. The hydrogen atomic spectrum provides a visual representation of these jumps as unique spectral lines created when electrons move back to lower energy levels, releasing energy in the form of light.

Bohr's conclusions were primarily derived from observations of the hydrogen atomic spectrum. Hence, option A, Hydrogen atomic spectrum, is the strong support for Bohr's belief that electrons occupied different energy levels. His model successfully predicted the energy levels for hydrogen, earning him the Nobel Prize in Physics in 1922. However, this model could not fully explain the spectra of atoms with more than one electron.

Answer:

The correct answer is D :Linear

Explanation:

Talking about molecular geometry and arrangement of atoms, liner geometry and trigonal bipyramidal arrangement of atoms would have 3 lone pairs and 2 no. of bond pairs.

For example, in ICl2 and XeF2, the central molecule has 3 lone pairs, and it shows sp3d hybridization.

In trigonal bipyramidal arrangement, orbitals have trigonal bipyramidal structure. It has three-atom molecules which have a linear shape and the orbitals on the equator contain three lone pairs each.

Answer:

linear

Explanation:

a p e x

Answer:

Table salt dissolving in water

Explanation:

NaCl(s) ⟶ Na⁺(aq) + Cl⁻(aq)

Sodium chloride is an ionic solid. When it goes into solution, the ions separate from the surface of the solid. The process is called dissociation.

A is wrong. In the solution process, the molecules simply separate from the surface of the crystal.

C is wrong. When HCl dissolves in water, it forms hydronium and chloride ions. The dissolution of covalent compounds in water to produce ions is called ionization.

D is wrong. Vegetable oil does not dissolve in water.

Answer:

[tex]\rm ^{216}_{\phantom{2}84}Po \to ^{\phantom{-}0}_{-1}\beta + ^{216}_{\phantom{2}85}At[/tex].

Both mass number (A) and atomic number (Z) shall conserve. Hence the mass number of the daughter nuclide shall be 216 and its atomic number be 85.

Let the mass number of the daughter nuclide be [tex]A[/tex].

[tex]216 = 0 + A[/tex].

[tex]A = 216[/tex].

Let the atomic number of the daughter nuclide be [tex]Z[/tex].

[tex]84 = (-1) + Z[/tex].

[tex]Z = 85[/tex].

Look up the atomic number of the daughter nuclide in a modern periodic table. Alternatively, given that this reaction is a beta-minus decay, look for the element to the right of the parent nuclide.

Explanation:

Nuclides are made of neutrons and protons.

The mass number shall thus be greater than or equal to the atomic number of a nucleus. However, note that occasionally the atomic number of electrons (beta-minus particles) is written as -1. The atomic number of positrons (beta-plus particles, the antiparticle of electrons) is written as +1. Beta particles do not contain protons or neutrons and might not satisfy rule [tex]A \ge Z[/tex].

[tex]^{A}_{Z}\mathrm{X}[/tex].

By convention

Both mass number and atomic number shall conserve in nuclear reactions. In other words, the sum of all mass numbers on the left-hand side of a nuclear equation shall be the same as the sum of all mass numbers on the right-hand side. So is the case with atomic numbers. For this nuclear equation,

Mass number on the left-hand side:

Mass numbers on the right-hand side:

Mass numbers conserve. Therefore,

[tex]216 = 0 + A[/tex].

[tex]A = 216[/tex].

Similarly,

Atomic number on the left-hand side:

Atomic numbers on the right-hand side:

[tex]84 = (-1) + Z[/tex].

[tex]Z = 85[/tex].

Refer to a modern periodic table. What is the element with the atomic number [tex]Z = 85[/tex]? Astatine.

Alternatively, notice that the atomic number [tex]Z[/tex] has increased by [tex]1[/tex] relative to the parent nuclide [tex]\rm ^{216}_{\phantom{2}84}Po[/tex]. Elements on a modern periodic table are order in the increasing order of atomic numbers. As a result, the daughter nuclide shall be on the right of the parent element.

Complete the atomic symbol of the daughter nuclide:

[tex]\rm ^{216}_{\phantom{2}85}At[/tex].

Final answer:

The balanced nuclear equation for the decay of polonium-216 with an emission of a beta particle is: ^{216}Po_{84}
ightarrow 0_{-1}eta + ^{216}At_{85}. The daughter nuclide is astatine-216.

Explanation:

The student has asked to write a balanced nuclear reaction for the decay of polonium-216 (216Po) with an emission of a beta particle (0-1eta). The Law of Conservation of Matter dictates that the sum of the mass numbers (top numbers) and the atomic numbers (bottom numbers) must be the same on both sides of the reaction. This is a fundamental principle in balancing nuclear reactions, also known as nuclear accounting.

To find the daughter nuclide in the given decay reaction, we recognize that the emission of a beta particle (0-1eta) increases the atomic number by 1, but does not change the mass number. Thus, the daughter nuclide will have an atomic number of 85 and a mass number of 216. Since the periodic table is organized by atomic number, we can easily look up element 85 to find that it is astatine (At), making the daughter nuclide 216At.

The balanced nuclear equation is:

216Po84 ightarrow 0-1eta + 216At85

Answer:

1) The mass of the produced salt (CuCl₂) = 13.45 g.

2) The mass of the produced water (H₂O) = 1.8 g.

Explanation:

CuO + 2HCl → CuCl₂ + H₂O,

It is clear that 1 mol of CuO reacts with 2 mol of HCl to produce 1 mol of CuCl₂ and 1 mol of H₂O.

no. of moles of CuO = mass/molar mass = (8.0 g)/(79.545 g/mol) = 0.1 mol.

no. of moles of HCl = mass/molar mass = (125.0 g)/(36.46 g/mol) = 3.43 mol.

∴ 0.1 mol of CuO "limiting reactant" reacts with 0.2 mol of HCl "excess reactant".

1 mol of CuO produces → 1 mol of CuCl₂, from stichiometry.

∴ 0.1 mol of CuO produces → 0.1 mol of CuCl₂.

∴ The mass of the produced salt (CuCl₂) = (no. of moles)(molar mass) = (0.1 mol)(134.45 g/mol) = 13.45 g.

1 mol of CuO produces → 1 mol of H₂O, from stichiometry.

∴ 0.1 mol of CuO produces → 0.1 mol of H₂O.

∴ The mass of the produced water (H₂O) = (no. of moles)(molar mass) = (0.1 mol)(18.0 g/mol) = 1.8 g.

Answer: i belive its 55

Explanation:tyy

Answer:

It’s simple. You’re doing it right, the question is just messed up. If you think about it it’s like H2O

Explanation:

Answer:

The answer is C7H8N4O2.

Same problem as your other question - you rounded in a place where you shouldn't have (see explanation below, exact same process)!

Explanation:

These are percents by mass. Pretend you have a 100g sample. That means you have:

46.66g C

4.48g H

31.10g N

17.76g O

Divide each by molar mass to find the moles of each:

C: 46.66 / 12 = 3.89 mol

H: 4.48 / 1 = 4.48 mol

N: 31.10 / 14 = 2.22 mol

O: 17.76 / 16 = 1.11 mol

Now divide each of these values by the lowest of the three to find the ratio between each element in the compound:

C: 3.89 / 1.11 ≈ 3.5

H: 4.48 / 1.11 ≈ 4

N: 2.22 / 1.11 = 2

O: 1.11 / 1.11 = 1

As with your other question, 3.5 is too different from 3, so you can't round it down. The .5 makes it easy to find the LCD - it's 2. Multiply each of the numbers by 2 to get your final answer:

C: 3.5 x 2 = 7

H: 4 x 2 = 8

N: 2 x 2 = 4

O: 1 x 2 = 2

Again, if you were to take the percent masses of the empirical formula you came up with, you'll see they're quite different from the one the question provided, which is why you can't round in this situation.

Answer:

I want to say B but I'm not sure

Answer:

The statement E is true on average kinetic energy; and mass and temperature.  If gases from different types have same quantity of mass and same quantity of temperature then there will be same quantity in average kinetic energy.

Explanation:

The gaseous kinetic theory has the assumption that the size of molecules in any compound is very small compared to the distance between them. Also, the molecules are always in a vibration and it collides with boundary of cylinder and with each other.

In reference to the kinetic theory of gases, the different gases having different mass at same temperature always have the same quantity of average kinetic energy because the average kinetic energy of gases has directly proportional relation to the gaseous temperature.

The gas at higher temperature has higher kinetic energy amount and vice-versa.

Explanation:

Every gas molecules are held by weak Vander waal forces because of which each molecule of a gas is free is move from one place to another.

This causes more number of collisions between molecules of a gas and gaps will also increase between each molecule.

As a result, gases are able to diffuse or spread at a faster rate.

Hence, generally it is true about the particles in a gas that gases diffuse at a faster rate.

Answer:

Explanation:

5 g Mg     1 mole Mg

            * ___________ =  0.208333 moles Mg

               24 grams Mg

24 is from the periodic table

Answer:

The first blank is half

The second blank is replicated

Explanation:

Cells produced at the end of telophase I have half as many replicated chromosomes as cells that started the process.

Answer:

the scattering and reflection of light by dust particles

Answer:

the scattering and reflection of light by dust particles

Explanation:

The process of scattering is responsible for the different colors we see in the sky.

Different colors have have some different wavelengths, and hence, scatter accordingly.

The small dust particles that is present in the air , gets scattered as the light falls on the dust particles , and hence give various colors to the sky , since , blue is the color that is scattered the most , therefore , maximum sky is blue in color .

Similarly during night time , there is no light , hence , the sky appears dark.

Answer & Explanation:

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O,

It is clear that every 1.0 mol of H₂SO₄ needs 2 mol of NaOH to be neutralized completely.

So, when you mix one mole of sulfuric acid with 1 mole of sodium hydroxide, there will be an excess of sulfuric acid.

Thus, the pH of the solution remain below 7.

Answer:

your answer to your question is B

I think answer of this question is D

A substance that will change its shape to fit its container, but has a definite volume, is in a liquid state of matter.

There are four (confirmed) states of matter, Solids, Liquids, Gasses, and Plasma. Solids, have definite shape and volume. Metalloids is a solid that does not have a definite shape, but does have an 'original' shape, the shape the metalloid was originally in. Liquids although have no original shape, although is does have a definite volume, which is how much space it takes up. Liquids will change to fit the shape of its container, so no matter what you put a liquid in, it will fit its container in some way or form. Water for example, being a liquid at room temperature, when pouring water into a bottle, you see it take the shape of the container, as supposed to. Gasses and Plasmas are a bit more complicated, so you could look those up if you'd like. I hope this helps you.

Answer:

108.3g

Explanation:

Given parameters:

Volume of solution = 570mm = 0.57L (1000mm = 1L)

Molarity of solution = 2M

Unknown

Mass of MgCl₂

Solution

We first find the  number of moles in the given concentration of magnessium chloride using the expression below:

       Number of moles of MgCl₂= Molarity x volume = 2 x 0.57 = 1.14moles

Using this known moles, we can the unknown mass of MgCl₂ the technician would require:

       Mass of MgCl₂ required = number of moles of MgCl₂ x molar mass

Molar mass of MgCl₂:

Atomic mass of Cl = 35.5g

Atomic mass of Mg = 24g

MgCl₂ = 24 + (35.5x2) = 95gmol⁻¹

Mass of MgCl₂ required = 1.14mole x 95gmole⁻¹ = 108.3g

The required mass is 109 grams.

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Answer:

meteorite or comet impact

Explanation:

The Cretaceous-Tertiary extinction is not the most devastating one that happened, but because of the organisms that got extinct are very well known and famous, it too became the most famous extinction. The reason for the extinction was an impact of a meteorite or comet where Yucatan is located in the present. The impact was so strong that the energy released from it wiped out everything in the surrounding area. But that was not all, as this impact also caused large scale wildfires, activated most of the volcanoes on the planet, triggered enormous tsunami, and a very hot air mass circled the whole planet and fried everything that was not sheltered. The dust, ashes, and other particles released into the atmosphere blocked the sun for a long period of time. the end result was the extinction of lot of animals and plants, most noticeably the dinosaurs.

Answer:

NH₄NO₃.

Explanation:

HNO₃ + NH₄OH → NH₄NO₃ + H₂O.

It is clear that it is an acidic salt.

So, its pH is < 7.

Answer: There must be the same number of atoms of each element on both sides of the equation.

Explanation: This is the only way the equations will be balanced. Adding the coefficients to see if they are equal will not guarantee that the equations are balanced becuase coefficients can be turned into subscripts.

Answer:

Bent.

Explanation:

A molecule with two bound groups and two lone pairs have a bent shape.

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Answer:

bent

Explanation: