How many atoms of each element are in the chemical formula......
CA(OH)2

A.1 calcium, 1 oxygen, and 1 hydrogen

B.1 calcium, 2 oxygen, and 2 hydrogen

C.2 calcium, 1 oxygen, and 2 hydrogen

D.2 calcium, 2 oxygen, and 2 hydrogen

Answer:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

Explanation:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

Answer:

your answer is A.oceanic crust

Answer:

Oceanic Crust

The chemical formula which represents an ionic compound is KCl or potassium chloride.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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The intermolecular forces that are responsible for the dissolution of Ethylene glycol in water is hydrogen bonding dipole-dipole forces and dispersion forces.

Both ethylene glycol and water contains the pair of hydrogen and oxygen.

The hydrogen of one atom create a bond with the oxygen of other atom this results in the formation of intra molecular hydrogen bonding.

The electron are non uniformly distributed over the molecule or the atom which results in the fluctuation of the electron density in the atom.

So it creates are dispersion forces which is present all over the molecule this forces helps to increase the strength of the bond formed between the ethylene glycol and water because they have large masses.

Both ethylene glycol and water are polar molecules because of being polar they form dipole and the dipole of both the molecules interact with each other in order to form bond between the atoms which eventually results in the formation dissolution of ethylene glycol in water.

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Compete Question - which intermolecular forces are responsible for the dissolution of ethylene glycol? select all that apply hydrogen bonding, dipole-dipole, dispersion and Ion dipole interaction.

The standard reaction free energy of the given reaction is 1810 kJ/mol.

The standard reaction free energy of the given chemical reaction can be calculated using the thermodynamic data given in the ALEKS Data tab. The standard reaction free energy is the difference between the standard Gibbs free energy of the products and the standard Gibbs free energy of the reactants.

The standard Gibbs free energy of the reactants 4PC1 (g) + P4 (g) + 601 (g) is -13.3 kJ/mol and the standard Gibbs free energy of the products 4PCl3 (g) + P4O10 (g) is -1796.3 kJ/mol. Therefore, the standard reaction free energy of the given reaction is 1796.3 - (-13.3) = 1809.6 kJ/mol. Rounding off the answer to zero decimal places, the standard reaction free energy of the given reaction is 1810 kJ/mol.

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The molar mass of the unknown gas is 142.53 g/mol.

Graham's law states that the square root of a gas's molar mass is inversely proportional to the rate of effusion of that gas (r) (M).

rH₂/rX = √[M(X)/ M(H₂)]

(rH₂/rX)² = M(X)/ M(H₂)

M(X) = (rH₂/rX)² × M(H₂)

M(X) = (8.4)² × 2.02 g/mol

M(X) = 164 g/mol

Therefore, molar mass of the unknown gas is 142.53 g/mol.

According to Graham's Law, a gas's rate of effusion is inversely related to the square-root of its molecular mass. The gas whose molecular weight is lowest will effuse first.

Based on the molar weights of the two gases, the rate of effusion calculator determines the rate of diffusion or effusion of one gas into another. Depending on the rate of diffusion, it can also provide you with the molar weight of a gas.

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Answer:

Radio waves

Explanation:

Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation. In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

The correct structure of the cyclic hemiacetal that forms under acidic conditions when 5-hydroxy-4-methylpentanal cyclizes is attached below.

In this structure, the aldehyde group (CHO) and the hydroxyl group (OH) on the same molecule have reacted to form a cyclic hemiacetal. The carbon atom in the aldehyde group has formed a bond with the oxygen atom in the hydroxyl group, resulting in a five-membered ring structure.

The hemiacetal group (-CH(OH)-) is attached to the second carbon atom in the chain, which is also methyl-substituted (H3C-) and located next to the oxygen atom in the ring.

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Since a pure liquid freezes at a constant temperature, a flat, horizontal zone is anticipated on the cooling curve. if the liquid is allowed to cool until it is completely frozen.

The temperature will then continue to drop as the solid cools, eventually reaching the bath's temperature.

When a liquid is cooled in a constant-temperature bath, a cooling curve for the liquid illustrates graphically how the temperature changes over time. To preserve temperature uniformity, the liquid is enclosed in a test tube and continually swirled. Two elements dominate in determining the pace of cooling. The temperature differential between the liquid and the bath is the first. As the liquid temperature approaches the bath temperature as a result of this factor, the cooling curve gradually becomes less steep (has a lower negative slope), finally approaching zero, and producing a horizontal line at the bath temperature.

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Answer:

HCl is a polar covalent compound, because of electronegativity difference between Cl(3.5) and hydrogen (2). Hence in this way, the bond between HCl breaks and they formed ions in the polar solvent like water .

hope it helps

limestone layers

The Types of Friction are;

Static Friction is a type of friction that stops objects from moving when a force is added and they aren't moving.

Kinetic friction happens when two things are rubbing against each other while they are moving. It tries to stop things from moving too fast.

Rolling friction happens when something rolls on a surface. Like a wheel moving on the ground. When objects move, it is easier for them to keep going because rolling friction (friction when something rolls) is usually less than kinetic friction (friction when something slides).

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______________________________________

The different types of friction are:

______________________________________

Friction is often called a necessary evil because it can be both helpful and harmful. On the one hand, friction is what allows us to walk, drive, and write, and it prevents objects from slipping and sliding out of our hands. On the other hand, friction can cause wear and tear on machines and vehicles, generate heat that can damage materials, and slow down or stop moving objects.

______________________________________

Friction should be reduced in certain situations to increase efficiency and reduce wear and tear. For example, reducing friction in engines and machines can increase fuel efficiency and decrease maintenance costs. However, friction should not be reduced in situations where it is necessary for safety, such as in car brakes or shoes.

______________________________________

Answer:

The reducing agent donates electron to the oxidizing agent and gets oxidized itself

Explanation:

In an oxidation-reduction reaction, also known as REDOX reaction, one of the reactants is called OXIDIZING AGENT while the other is called REDUCING AGENT. The reducing agent is called so because it reduces another substance in the reaction.

It reduces another atom/ion by donating electrons to that atom, hence, getting oxidized itself in the process. For example, in the following reaction:

H2 + F2 → 2HF

Fluorine is getting oxidized from -2 to 0 by donating electrons to H and reducing it from +2 to 0.

Answer:

Reduces another atom

Explanation:

:)

Answer:

0.17637 pounds

Explanation:

hope this help

The number of units of NaOH are in 80 grams is 12.046 x 10²³ Particles of NaOH.

The mole, symbol mol, is the SI base unit of amount of substance.

The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

Formula to calculate number of Particles when weight of the sample is given ;

N = given weight  / Molecular weight x Nₐ

   = 80 / 40 x 6.023 x 10²³ Particles

   =  12.046 x 10²³ Particles of NaOH

Hence, The number of units of NaOH are in 80 grams is 12.046 x 10²³ Particles of NaOH.

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We need to find the mass of 1.6x10^20 molecules of carbon monoxide

First, we must find the number of mol in the 1.6x10^20 molecules

For this, we need to use the avogadro's number ( 6.02*10^23 )

Then, we must calculate the molar mass of carbon monoxide

M(CO) = 12 g/mol + 16 g/mol = 28 g/mol

Finally, we must multiply the number of mol by the molar mass to find the mass

ANSWER:

0.007

The first ores that were widely smelted by humans to produce metal were those of copper, option .

Ore is a naturally occurring rock or silt that includes precious minerals that are concentrated above background levels and may be mined, processed, and sold profitably. Metals are the most common valuable minerals found in ore. The concentration of the desired ingredient in an ore is referred to as its grade.

To decide if a rock has a high enough grade to be worth mining and is thus regarded as an ore, the value of the metals or minerals it contains must be evaluated against the expense of extraction. An ore that contains many precious minerals is said to be complex. Typically, oxides, sulphides, silicates, or native metals like copper or gold are the minerals of interest.

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The first ores that were widely smelted by humans to produce metal were those of copper.

Metals are a crucial part of the history of mankind and cannot be left out. In fact, it was quite common for historians to describe particular historical eras using metals that were in use at the time. The Stone Age, Bronze Age, and Iron Age, among others, all existed. One of the metals that man has used since very ancient times is copper. In actuality, copper was the first metal that man ever discovered, in the year 9000 BCE. Gold, silver, tin, lead, and iron were also used in prehistoric times.

Chemically speaking, copper is an element known as Cuprum. Cu is its chemical symbol. Cuprum, a Latin word, literally translates as "from the island of Cyprus." Its colour is a reddish-brown metal.

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Answer:

A

Explanation:

'herd behavior' helps understand the question for the answer

Answer:

A. Adults keep the young musk oxen warm.

Explanation:

Answer:

Enzymes act as catalysts, accelerating the chemical reaction by lowering the activation energy. Activation energy is the energy needed for the particles to react. Enzymes come out of the reaction unchanged.

Explanation:

The answer is that 2-ethyl-3-oxo hexanal gets reduced in this experiment. This is because reduction involves the gain of electrons, and in this experiment, 2-ethyl-3-oxo hexanal is being reduced to 2-ethyl-1,3-hexanediol.

Reduction is a chemical reaction that involves the gain of electrons. In this experiment, we can see that 2-ethyl-3-oxo hexanal is being reduced to 2-ethyl-1,3-hexanediol. This means that 2-ethyl-3-oxo hexanal is losing electrons and becoming more positively charged, while 2-ethyl-1,3-hexanediol is gaining electrons and becoming more negatively charged. The other species listed, acetic acid and hypochlorous acid, are not directly involved in the reduction reaction and do not get reduced themselves.

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Answer:

Magnetized objects move in the direction that reduces their magnetic potential energy. This is no different than the skate park.

Explanation:

Answer:

it releases energy

Explanation:

Answer:

It releases energy

Explanation:

The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, releasing energy because weak high-energy bonds, in particular in molecular oxygen, are replaced by stronger bonds in the products.

Answer: Yes it is. Rust would be considered a chemical reaction because it changes the chemical makeup of the metal.

Explanation:

Answer:

Yes

Explanation:

Rusting is an example of a chemical reaction because it creates a new product. When iron reacts with oxygen (rusting) it becomes Iron (III) oxide.

Answer:

Molarity = 0.08 M

Explanation:

Given data:

Mass of copper sulfate = 3.8 g

Volume of water = 250 cm³  (250/1000 = 0.25 L)

Concentration of solution = ?

Solution:

Number of moles of copper sulfate:

Number of moles = mass/molar mass

Number of moles = 3.8 g/ 159.6 g/mol

Number of moles = 0.02 mol

Concentration:

Molarity = Number of moles / volume in L

By putting values,

Molarity = 0.02 mol / 0.25 L

Molarity = 0.08 mol/L

Molarity = 0.08 M

The pH of the 0.045 M aqueous solution of the acid HA is approximately 4.53.

To calculate the pH of a 0.045 M aqueous solution of an acid (HA) with an ionization constant (Ka) of 1.93 x 10^-7, we can use the following formula:
pH = -log10[H+]
First, we need to find the concentration of hydrogen ions (H+). Since HA is a weak acid, we can set up an equilibrium expression using Ka:
Ka = [H+][A-]/[HA]
1.93 x 10^-7 = (x)(x)/(0.045 - x)
Assuming x is much smaller than 0.045, we can simplify the equation:
1.93 x 10^-7 ≈ x^2/0.045
Now, solve for x:
x^2 = (1.93 x 10^-7)(0.045)
x^2 = 8.685 x 10^-9
x = 2.95 x 10^-5 M (concentration of H+)
Finally, calculate the pH:
pH = -log10(2.95 x 10^-5)
pH ≈ 4.53 (rounded to two sig figs)

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The solubility parameter of polyamide 11 is approximately [value] (units).Among the solvents benzyl alcohol, methanol, and ethyl methyl ketone, the best solvent for polyamide 11 is [solvent name].

The solubility parameter is a measure of the cohesive energy density of a substance and is used to determine the compatibility between a polymer and a solvent. It represents the overall energy required to disperse the intermolecular forces within a substance.

To calculate the solubility parameter of polyamide 11, we need to know the values of the solubility parameters for the individual components of the polymer, such as the molar volume and cohesive energy density. Unfortunately, the solubility parameter values for specific polymers are not readily available in general literature.

To determine the best solvent for polyamide 11, we compare the solubility parameter values of the solvents with that of polyamide 11. The solvent with a solubility parameter closest to that of polyamide 11 is considered the best solvent.

Without specific solubility parameter values for polyamide 11 and the solvents benzyl alcohol, methanol, and ethyl methyl ketone, it is not possible to provide a direct calculation or comparison. The solubility parameter is an important factor in solvent selection for polymers, as it indicates the compatibility and likelihood of dissolution. However, without the necessary data, a definitive conclusion cannot be drawn regarding which solvent would be the best for polyamide 11. To determine the best solvent, it is recommended to consult literature or experimental data that provides solubility information for polyamide 11 in various solvents.

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Amino Acids is your answer