crystal structure of argon

Answer

Laws that are used by astronomers to learn about stars indirectly are as given below:-

Answer:

An acid is a substance that liberates hydrogen ions (protons) when allowed to dissociate in aqueous media. Examples are hydrochloric acid, sulfuric acid, nitric acid, etc, all of which are very strong acids, and ethanoic acid, citric acid, etc, which are weak acids. An alkali generally gives off hydroxyl ions in aqueous media. Examples are sodium hydroxide, potassium hydroxide, ammonia, etc.An acid is a substance that liberates hydrogen ions (protons) when allowed to dissociate in aqueous media. Examples are hydrochloric acid, sulfuric acid, nitric acid, etc, all of which are very strong acids, and ethanoic acid, citric acid, etc, which are weak acids. An alkali generally gives off hydroxyl ions in aqueous media. Examples are sodium hydroxide, potassium hydroxide, ammonia, etc.

Explanation:

An acid is a substance that liberates hydrogen ions (protons) when allowed to dissociate in aqueous media. Examples are hydrochloric acid, sulfuric acid, nitric acid, etc, all of which are very strong acids, and ethanoic acid, citric acid, etc, which are weak acids. An alkali generally gives off hydroxyl ions in aqueous media. Examples are sodium hydroxide, potassium hydroxide, ammonia, etc.

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore,  production of 39 g of C\(_2\)H\(_2\) requires consumption of 53.6g of H\(_2\)O.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

moles of C\(_2\)H\(_2\)= mass of C\(_2\)H\(_2\)/molar mass of C\(_2\)H\(_2\)

                        =39 g /26.04

                        = 1.49moles

for 1 mole of C\(_2\)H\(_2\), 2 moles of H\(_2\)O is required.

for 1.49 moles of C\(_2\)H\(_2\), 2×1.49=2.98 moles of H\(_2\)O is required.

mass of water= moles× Molar mass

                       = 2.98×18

                       =53.6g

Therefore,  production of 39 g of C\(_2\)H\(_2\) requires consumption of 53.6g of H\(_2\)O.

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The right-hand side of the atomic numbers contains nonmetals, which have relatively high electronegativity values and a propensity to gain electrons.

Atoms in molecules are held together by chemical bonds. Electrostatic forces between negative-charged electrons and ionized atomic nuclei produce bonds (the positions of which in space are determined by quantum mechanics).

A chemical bond is the term used to describe the attraction amongst atomic nuclei. To form bonds, atoms exchange or swap their valence electrons. The valence electrons, which make up an atom's lowest energy level, have the capacity to interact chemically. The most straightforward explanation is that atoms are trying to enter the safest (lowest-energy) state they can.

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The age of the remnants is calculated as 3807 years.

The half life is the time taken for only half of the number of the radioactive atoms to remain.

Half life of carbon - 14 = 5730 years.

Initial count rate = 8.0 counts per minute per gram

Count rate at time t =  12.7 counts per minute per gram of carbon

Since;

0.693/t1/2 =2.303/t log (N/No)

0.693/5730 = 2.303/t log (12.7/8)

1.21 * 10^-4 = 2.303/t * 0.2

t = 2.303 * 0.2/1.21 * 10^-4

t = 0.4606/1.21 * 10^-4

t = 3807 years

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Volume Measurement Laboratory Apparatus:

Graduated Cylinder: A cylindrical container with volume markings along its vertical axis, used for measuring liquid volumes with good accuracy.

Burette: A long, graduated tube with a stopcock at the bottom, used for precise measurement of volumes of liquids during titrations.

Pipette: A slender tube with a tapered tip used to transfer specific volumes of liquids accurately. Common types include volumetric pipettes and micropipettes.

Volumetric Flask: A flask with a precise volume marking, typically used for preparing solutions of known concentrations.

Mass Measurement Laboratory Apparatus:

Analytical Balance: A highly accurate balance used to measure the mass of solid samples or substances with high precision.

Top-loading Balance: A balance that measures the mass of larger samples or substances with slightly lower accuracy compared to an analytical balance.

Weighing Boat/Dish: A small container used to hold substances being weighed on a balance.

Weights: Standard weights of known mass used to calibrate and verify the accuracy of balances.

Fire Producers Laboratory Apparatus:

Bunsen Burner: A gas burner commonly used for heating, sterilization, and flame-related experiments.

Alcohol Burner/Spirit Burner: A small burner that uses alcohol as fuel to produce a controlled flame for heating applications.

Meker Burner: A type of gas burner that produces a hot, intense flame with multiple openings, commonly used in laboratory settings.

Safety Matches/Laboratory Matches: Matches designed to be more stable and resistant to accidental ignition, often used to light Bunsen burners and other flames safely.

It's important to note that when working with fire-producing laboratory apparatus, proper safety protocols, such as wearing protective equipment and handling flammable substances with caution, should always be followed to prevent accidents and ensure laboratory safety.

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The aqueous solution with the highest ion concentration is b. 300 mL of 0.10 M CaCl2. There are the following moles in 400 mL of 0.10 M NaCl .

An aqueous solution is one in which water serves as the solvent. In chemical equations, it is often represented by adding to the appropriate chemical formula. For instance, Na+ + Cl might be used to depict a solution of table salt, or sodium chloride, in water.

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HCl, HI, H₂SO₄, LiCl, and KI are all classified as acids. These compounds, HCl, HI, H₂SO₄, LiCl, and KI, all dissociate in water to release hydrogen ions (H⁺), which is the defining characteristic of acids.

Strong electrolytes are substances that completely dissociate into ions when dissolved in water, resulting in a high electrical conductivity. HCl, HI, H₂SO₄, LiCl, and KI all fall under this category. When these compounds dissolve in water, they break apart into their constituent ions, such as H⁺ and Cl⁻ for HCl, H⁺ and I⁻ for HI, H⁺ and SO₄²⁻ for H₂SO₄, Li⁺ and Cl⁻ for LiCl, and K⁺ and I⁻ for KI.

These ions are capable of conducting electricity in the solution, hence qualifying these compounds as strong electrolytes. It's important to note that strong electrolytes undergo complete ionization, meaning that nearly all of the compound dissociates into ions.

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The halogen family of elements includes bromine. Iodine, fluorine, and chlorine are some of its buddies. Bromine is very reactive and, like the other halogens, contains seven electrons in its outer shell.

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Answer:

14 mol O₂

Explanation:

The reaction between CO and O₂ is the following:

CO + O₂ → CO₂

We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:

2CO + O₂ → 2CO₂

As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:

28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂

Evaporation. ( Evaporation is a type of evaporation that occurs at the surface of a liquid as it transitions to the gas phase. )

What are two types of evaporation?

There are two types of evaporation:

evaporation and boiling. Evaporation is a surface phenomenon and occurs only at the phase boundary between the liquid and gas phases. Atoms or molecules on the surface gain energy from the environment, overcome the attraction of other molecules, and evaporate.

How does the temperature affect evaporation?

Water evaporates at low temperatures, but it evaporates faster as the temperature rises. This makes sense. This is because more molecules move faster at higher temperatures. Therefore, the molecule is more likely to have enough energy to leave the liquid and become a gas.

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False. Reverse-phase chromatography (HPLC) separates peptides based on their hydrophobicity and charge, not their molecular weight.

Reverse-phase chromatography (HPLC) separates peptides based on their hydrophobicity and charge, not their molecular weight. HPLC works by running a sample of peptides through a column containing a stationary phase, which is usually a hydrophobic material such as silica gel or alumina. The peptides then interact with the stationary phase, and the ones that are more hydrophobic will be retained in the column longer than the ones that are more hydrophilic, resulting in a separation of the peptides based on their hydrophobicity and charge.

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Answer:

Chemical energy.

Explanation:

This is biology btw, not chemistry

Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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Answer:

What are the full directions?

Answer:

Flaming

Posting on a blog

ALL CAPS

Troll

;-)

Flamewar

LOL

Explanation:

Hope this helps. Have a nice day. May it be filled with joy and happiness. Please, stay safe and wash your hands. Happy Holidays.

The difference in energy between the two levels responsible for the violet emission line of the calcium atom at 422.7nm is 2.93 eV.

given that :

The photon wavelength , λ = 422.7 nm = 422.7 × 10⁹ m

the energy of photon is given as follows :

E = hc /  λ

where

h = planck constant = 4.135 × 10⁻¹⁵eV.s

c = speed of the light = 3 × 10⁸ m/s

now, putting the values in the energy formula, we get :

E = hc /  λ

E = ( 4.135 × 10⁻¹⁵eV.s × 3 × 10⁸ m/s ) / 422.7 × 10⁹ m

E = 2.93 eV.

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when the waves pass from the deeper water to the shallower water its speed will decrease.

Refraction of wave is the change in direction of a wave passing from one medium to another caused by its change in speed.

For example, waves travel faster in deep water than in shallower water.

Thus, we can conclude that when the waves pass from the deeper water to the shallower water its speed will decrease.

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Answer:

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.

Explanation:

I hope it helps! Please mark my answer as a bräinliest.

Thank You!

The volume of the 0.600 m HCl is required to react completely with the 2.50 g of sodium hydrogen carbonate is 48 mL.

The chemical equation is as :

NaHCO₃(aq)  +  HCl(aq)  --->  NaCl(aq)  +  CO₂(g)  +  H₂O(l)

The mass of the sodium hydrogen carbonate, NaHCO₃ = 2.50 g

The number of the moles, NaHCO₃ = mass / molar mass

The number of the moles, NaHCO₃ = 2.50 / 84

The number of the moles, NaHCO₃ = 0.029 mol

The moles of the NaHCO₃ = the moles of the HCl

The moles of the HCl = 0.029 mol

The molarity of the HCl = 0.600 M

The volume of the HCl = moles / molarity

The volume of HCl = 0.029 / 0.600

The volume of HCl = 0.048 L = 48 mL

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Answer:

The correct answer is Water boiling. Examples of physical change are freezing of water, boiling of water, melting of wax, etc. Examples of chemical change are digestion of food, burning of paper, rusting of metal, silver tarnishing, etc.

Explanation:

 It drowns out some of the more delicate notes. It changes the flavour balance.

Answer:

Simply cuz so u can drink It without bacteries chlorine also changes a bit taste depends on RM

!Do not use this answer for cheating, please only use my answers to check your own!

Before tap water was found, people would use rocks, gravel, and sometimes even thick cloth to filter water. If you do not filter water, there is a huge chance that bugs, bacteria, viruses, and other things may be entering your body. Today some houses still have the past was of filtering, with rocks and gravel. Except chlorine is used to kill any bacteria that was left over the rocks and gravel may of missed.

Answer:
3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

Explanation:

In this equation, copper (Cu) reacts with trioxonitrate(V) (HNO3) to produce copper(II) nitrate (Cu(NO3)2), nitrogen monoxide (NO), and water (H2O).

During the reaction, the copper atoms are oxidized by the nitrate ions in nitric acid to form copper(II) ions (Cu2+), while the nitrate ions are reduced to nitrogen monoxide (NO). The water molecules are produced as a byproduct of the reaction.

Overall, the reaction between copper and trioxonitrate(V) is a redox reaction, where oxidation and reduction occur simultaneously. This reaction is commonly used in the laboratory for the preparation of copper(II) nitrate.

Answer:

Cell division is the process by which a cell, called the parent cell, divides into two cells, called daughter cells.[1] When the cell divides, everything inside it divides also. The nucleus and the chromosomes divide, and the mitochondria divide also.

In mitosis, an ordinary body (somatic) cell divides to make two daughter cells.

In meiosis, a cell divides twice, to produce four gametes (sex cells). The first division of meiosis is a special kind of cell division called a reduction division because the number of chromosomes is halved. The second division of meiosis is similar to mitosis.[2]

Three types of cell division: left is binary fission as in bacteria; right are mitosis and meiosis as in eukaryotes.

Cells are the 'building blocks' of life, and cell division is a basic feature of life. For simple unicellular organisms like Amoebozoa, one cell division reproduces the entire organism. On a larger scale, cell division can create offspring from multicellular organisms, such as plants that grow from cuttings. But most importantly, cell division enables organisms that are able to sexually reproduce to develop from the one-celled fertilised egg (zygote). Cell division also allows for continual renewal and repair of the organism.

The cell division is completed in the four phases prophase, metaphase, anaphase, and telophase.

It is the process by which cells divide into daughter cells. This keeps the cell organism to survive.

The five facts about cell division are:

Therefore, the cell division is completed in the four phases prophase, metaphase, anaphase, and telophase.

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pH of the solution = 1.82

pH is a measure of the acidity or basicity (alkalinity) of a solution. It is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in a solution. The pH scale ranges from 0 to 14, with a pH of 7 being neutral. A pH less than 7 is acidic, while a pH greater than 7 is basic (alkaline).

To calculate the pH of 0.095 M HZ, we need to use the equation for the dissociation of a weak acid:

HZ ⇌ H+ + Z-

The equilibrium constant for this reaction is Ka = [H+][Z-]/[HZ], which can be simplified as:

Ka = [H+]^2 / [HZ]

Rearranging this equation, we get:

[H+] = sqrt(Ka * [HZ])

Substituting the values given in the question, we get:

[H+] = sqrt(2.55 × 10−4 * 0.095) = 0.015 M

Now, we can use the equation for pH:

pH = -log[H+]

Substituting the value of [H+], we get:

pH = -log(0.015) = 1.82

Therefore, the pH of 0.095 M HZ is 1.82.

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Answer:

C) Physical and chemical properties

Answer:

physical and chemical properties

Explanation:

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