The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. express this distance in scientific notation.

Answer:

Lawrencium (Lr)

Explanation:

The element with the given electron configuration is Lawrencium (Lr), which has an atomic number of 103.

Heliocentric model of the solar system state the sun is assumed to lie at or near a central point and the earth and other bodies revolve around it.

Heliocentrism is the astronomical model developed by Nicolaus Copernicus and published in 1543 and this model postulate that the sun at the center of the universe with Earth and the other planets orbiting around it in circular paths and main heliocentric means earth revolve around the sun is called as heliocentric theory

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Answer:

d. The mass of an electron

Answer:

C. the length of the string

Explanation:

Answer:

C. the length of the string

Explanation:

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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If a radioactive isotope has a half-life of 400 million years, it will take 400 million years for 50% of the material to change to the daughter product.

How long it takes for half of the radioactive atoms to decay is known as the half-life of the isotope. A radioactive isotope's half-life is the amount of time it takes for half of the parent material to decay to the daughter product. It's worth noting that a half-life isn't a fixed amount of time for each radioactive isotope.

The following formula can be used to calculate the amount of radioactive isotope remaining after a given period of time:

t=ln(N₀/N) / λ

Where:

For this problem, we need to solve for the time (t) at which 50% of the radioactive isotope has decayed:

0.5N₀ = N₀ e^(-λt)

0.5 = e^(-λt)

t = ln(0.5) / (-λ)

We know that the half-life of this isotope is 400 million years, which means that λ is equal to:

ln(2) / (400,000,000 years)

λ = 0.00000000017 / year

Substituting that value into the formula:

t = ln(0.5) / (-0.00000000017 / year)

t ≈ 400,000,000 years

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Answer:

H₂CO₃

Explanation:

Water + Carbon di oxide

H20+ CO2

= H2CO3

Answer:

1. 2Ca + N\(_{2}\) → 2CaN

2. 4Li + O\(_{2}\) → 2Li\(_{2}\)O

3. 2KCl + BaF\(_2\) → 2KF + BaCl\(_2\)

4. CH\(_4\) + 2O\(_2\) → CO\(_2\) + 2H\(_2\)O

Be sure to balance the number of atoms on both sides of each equation only by adding coefficients to the compounds!!!! Those without a coefficient are meant to have a coefficient of 1.

There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the beta decay of platinum-199 is ₇₉Au¹⁹⁹.

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle.

The balanced equation for the beta decay of ₇₈Pt¹⁹⁹.

₇₈Pt¹⁹⁹ \(\rightarrow\) -₋₁e⁰ + ₇₉Au¹⁹⁹

Beta decay is the emission of electron particle from the given isotope. the product is gold- 199.

Therefore, the beta decay of platinum-199 is  ₇₉Au¹⁹⁹.

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We can see here that based on the description provided, the electron configuration can be represented pictorially as follows:

1s: ↑↓

2s: ↑↓

2p: ↑↓ ↑↓ ↑↓

3s: ↑↓

3p: ↑↓ ↑↓ ↑↓

4s: ↑↓

3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓

4p: ↑↓ ↑↓ ↑

Electron configuration refers to the arrangement of electrons within an atom, specifically how they are distributed among the atomic orbitals. It describes the energy levels and sublevels occupied by electrons in an atom or ion.

In this representation, the arrows indicate the electrons, and the superscript numbers denote the number of electrons in each orbital. The "up" arrows (↑) represent electrons with a positive spin (+1/2), and the "down" arrows (↓) represent electrons with a negative spin (-1/2).

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Answer:

A

Explanation:

energy stored in chemical bonds of molecules

Answer:

ICI 204448 hydrochloride | C23H27Cl3N2O4 | CID 129407 - structure, chemical names, physical and chemical properties, classification, patents, literature, etc...

hope this helps!! have an amazing day <3

Answer:

Hydrogen = colourless, odourless, extremely flammable

Lithium = lowest density, reacts with water, high specific heat

Oxygen = nonpolar, reactive, tasteless

Helium = low boiling point, low density, low solubility

Nitrogen = odorless, colorless, nonflammable

Yes, the IR spectrum allow you to confirm that the structure of the product is a combination of the two reactants.

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Answer:

CaC2 + 2H2O → C2H2 + Ca(OH)2

thats it

Explanation:

Answer:

Unbalanced Energy

Explanation:

:p

Answer: Alkali metals, group 1

Explanation: Group 1 means 1 valence electron. This group is called alkali metals, which indicates that it is a metal. They are highly reactive because only 1 electron needs to move to bond with something (since it only has 1 valence electron)

Answer:

helping hand

Explanation:

dddeedehhhwuww

a. The given reaction  is spontaneous under standard conditions.

b.  the reaction is spontaneous under standard conditions.

a. To determine the spontaneity of the reaction Cu + ZnCl2 -> CuCl2 + Zn, we need to calculate the cell potential and the Gibbs free energy change.

The half-reactions for this reaction are:

Cu -> Cu2+ + 2e- (E° = 0.34 V)

Zn2+ + 2e- -> Zn (E° = -0.76 V)

To obtain the overall cell potential, we subtract the reduction potential of the anode (Zn2+ + 2e- -> Zn) from the reduction potential of the cathode (Cu2+ + 2e- -> Cu):

E°cell = E°cathode - E°anode

E°cell = 0.34 V - (-0.76 V)

E°cell = 1.10 V

Since the cell potential is positive, the reaction is spontaneous under standard conditions.

To calculate the Gibbs free energy change, we use the equation:

ΔG° = -nFE°cell

where n is the number of electrons transferred in the reaction and F is the Faraday constant (96485 C/mol). For this reaction, n = 2.

ΔG° = -2 * 96485 C/mol * 1.10 V

ΔG° = -211.87 kJ/mol

Since the Gibbs free energy change is negative, the reaction is spontaneous under standard conditions.

b. To determine the spontaneity of the reaction Fe + ZnCl2 -> FeCl2 + Zn, we need to calculate the cell potential and the Gibbs free energy change.

The half-reactions for this reaction are:

Fe2+ + 2e- -> Fe (E° = -0.44 V)

Zn2+ + 2e- -> Zn (E° = -0.76 V)

To obtain the overall cell potential, we subtract the reduction potential of the anode (Zn2+ + 2e- -> Zn) from the reduction potential of the cathode (Fe2+ + 2e- -> Fe):

E°cell = E°cathode - E°anode

E°cell = (-0.44 V) - (-0.76 V)

E°cell = 0.32 V

Since the cell potential is positive, the reaction is spontaneous under standard conditions.

To calculate the Gibbs free energy change, we use the equation:

ΔG° = -nFE°cell

where n is the number of electrons transferred in the reaction and F is the Faraday constant (96485 C/mol). For this reaction, n = 2.

ΔG° = -2 * 96485 C/mol * 0.32 V

ΔG° = -62.02 kJ/mol

Since the Gibbs free energy change is negative, the reaction is spontaneous under standard conditions.

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The number 1.249 633 500 x 10¹⁰, reported to four significant figures, would be written as 1.250 x 10¹⁰.

To understand how to round this number to four significant figures, we need to consider the rules for significant figures.

In scientific notation, the coefficient part (1.249 633 500) determines the number of significant figures. The first non-zero digit and all the digits that follow are significant.

In this case, the first non-zero digit is 1, and all the digits that follow (2, 4, 9, 6, 3, 3, 5, 0, 0) are also significant. Therefore, we have a total of nine significant figures.

To round to four significant figures, we look at the fifth significant figure, which is 6 in this case. Since it is greater than 5, we round up the fourth significant figure (9) by adding 1 to it. This gives us 10.

After rounding, the number becomes 1.250. Since we moved the decimal point one place to the right, the exponent becomes 10¹⁰.

Therefore, 1.249 633 500 x 10¹⁰, reported to four significant figures, is 1.250 x 10¹⁰.

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The mass of 4.00 × 10^22 helium atoms is approximately 0.265 grams.

To determine the mass of 4.00 × 10^22 helium atoms, we need to know the molar mass of helium, which is 4.0026 g/mol. The molar mass represents the mass of one mole of helium atoms.

To calculate the mass of a given number of helium atoms, we can use the following steps:

Convert the given number of helium atoms to moles:

Moles = Number of atoms / Avogadro's number

Moles = 4.00 × 10^22 atoms / 6.022 × 10^23 atoms/mol

Calculate the mass using the molar mass of helium:

Mass = Moles × Molar mass

Mass = Moles × 4.0026 g/mol

Now, substituting the values:

Moles = (4.00 × 10^22 atoms) / (6.022 × 10^23 atoms/mol) ≈ 0.0663 mol

Mass = (0.0663 mol) × (4.0026 g/mol) ≈ 0.265 g

Therefore, the mass of 4.00 × 10^22 helium atoms is approximately 0.265 grams.

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Answer:

The exception in the order of the periodic table is;

B.) Cobalt is located before Nickel even though it has a higher average atomic mass

Explanation:

The Russian chemist Dmitri Mendeleev who formulated the periodic law, observed that the arrangement of the atoms in an order of their increasing atomic mass resulted in a table that show a recurring pattern in the properties of the elements within each group

However, cobalt (atomic mass 58.93 amu) which was heavier than nickel (atomic mass 58.71) was placed before nickel due to the similarities of its chemical properties to the group in which it was placed

It was later observed that cobalt with 27 protons was rightly placed to come before nickel that has 28 protons in the periodic table classified by atomic numbers which is the proton number.

Answer: In the photosystem II (PSII) reaction center, energy from sunlight is used to extract electrons from water. Explantion: The electron transport chain moves protons across the thylakoid membrane into the lumen.

This sample of chromium-51 will degrade from 35 grams to 10 grams over the course of 84 days.

This energy found in an atom's nucleus, or core, is referred to as nuclear energy. All everything in the cosmos is made up of microscopic building blocks called atoms, and the nucleus is held together by energy. A compact nucleus of an atom has a tremendous amount of energy.

The United States, which will produce 771,638 GWh in nuclear energy in 2021, will be by far the greatest nuclear electricity generator, followed by China, which will produce 383,205 GWh. 56 reactors with a total power of 57,848 MWe and 438 reactors with such a net power of 393,333 MWe were operating as of August 2022.

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The idea of the atomic nature of matter was first developed by John Dalton.

He introduced the atomic theory, which proposed that matter was made up of tiny, indivisible particles called atoms. This theory was based on his observations and experiments on the behavior of gases

.Dalton's atomic theory had several postulates that helped explain the properties of matter. These postulates were:

All matter is made up of atoms, which are tiny, indivisible particles

.Each element is composed of atoms that are identical in size, shape, and chemical properties.

Atoms of different elements have different sizes, shapes, and chemical properties.

Atoms combine in fixed ratios to form compounds, and the ratios of their masses are related by whole numbers.

Atoms are indestructible and cannot be created or destroyed in chemical reactions

.However, Dalton's atomic theory was later modified and expanded upon by other scientists, including J.J. Thomson, Ernest Rutherford, and Niels Bohr, as new discoveries about the structure and behavior of atoms were made.

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Answer:

The answer is below

Explanation:

Certain countries like Germany under Adolf Hitler favored military solutions to the great depression because the government felt that having a mass production of military weapons and recruitment of unemployed people or citizens into the army would change the dire situation.

On the other hand, countries like the United States did not favor the military solutions but instead choose the NEW DEAL under Franklin D Roosevelt; the reason could be linked to their democratic culture, the isolation belief tendency.

Explanation:

¿Cuál es la carga compuesta para el fosfuro de Aluminum phosphide is a chemical compound with the formula AlP; Phosphine gas generator which is extremely toxic to any living being. estroncio?

Answer:

A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits

The number if moles of carbon and chlorine here is 0.08 and that of hydrogen is 0.16. Then, the empirical formula is CH₂Cl. The molecular formula of the compound is C₂H₄Cl₂.

Empirical formula of a compound is derived from the number of moles of constituent elements present in the compound.

Given ,

Mass of carbon = 0.96 g

atomic mass = 12 g/mol

no.of moles  = 0.96 /12 = 0.08

mass of H = 0.16 g

atomic mass = 1 g

then no.of moles = 1

mass of Cl = 2.84 g

atomic mass = 35.5 h/mol

no.of moles =2.84 /35.5 = 0.08 moles.

The ration of the no.of moles of C, H and Cl is 0.08 : 0.16 :0.08 . Convert them to whole number ratio , we get, 1 :2 : 1,

Thus, the empirical formula is CH₂Cl.

Given, the molecular mass = 99 g

empirical formula mass = (12 + 1 + 35.5 ) =  49.5

99 /49.5 = 2.

multiply the empirical formula by 2 . We het the molecular formula of the compound C₂H₄Cl₂.

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