Formation of hydrogen bonds requires hydrogen atoms and what else? polar covalent bonds water ionic bonds oxygen

the no. of Al atoms required to be laid side by side to make up a distance of 4.23 mm is = 4.23/(2 * 143 * 10^(-9) )

= 14790210 atoms of Al.

What is the radius of an atom?

The atomic radius of an atom is the distance between the centre of the nucleus and the outermost electron in each of its energy shells. Since the border is not a clearly defined physical entity, there are many non-equivalent definitions of atomic radius. The four most popular ways to define atomic radius are van der Waals radius, ionic radius, metallic radius, and covalent radius. Due to the challenges of isolating individual atoms to measure their radii, atomic radii are frequently measured in a chemically bonded state; yet, theoretical calculations are simpler when individual atoms are taken into account.

1 pm = 10^(-9) mm

radius of Al atom = 143 pm = 143 * 10^(-9) mm

Diameter of Al atom = 2 * 143 * 10^(-9) mm

Thus, the no. of Al atoms required to be laid side by side to make up a distance of 4.23 mm is = 4.23/(2 * 143 * 10^(-9) )

= 14790210 atoms of Al.

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The statement that describes the particles that make up the rigid structure of a three-dimensional crystalline solid is:

Solids are one of the three states in which matter exists.

Solids are characterized by their having definite shapes and volumes.

Solids have definite shapes and volumes because of the arrangement of the particles in a solid.

The intermolecular forces of the particles in a solid are very strong such that the particles are not free to move but  vibrate about a fixed position.

Thus, they are arranged in rigid continuous patterns as seen in solid crystals.

In conclusion, the particles in a crystalline solid are arranged in regular repeating patterns forming a three-dimensional structure.

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3.04 gm of ammonium thiocyanate is used to react completely with a molecular mass of 6.7 gm of barium hydroxide octahydrate.

Ba(OH)₂.8H₂O + 2NH₄ScN⇒ Ba(ScN)₂ + 10H₂O + 2NH₃

weight = Molecular mass × Number of moles

moles of barium hydroxide octahydrate = 6.5/315 = 0.02 M

moles of ammonium thiocyanate = 2 × 0.02 = 0.04 M

weight of ammonium thiocyanate required = 0.04 × 76.1 = 3.044 gm.

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Answer:

mL,L,cm^3

Explanation:

Because 1s electrons are most attracted to the nucleus, peak X results.

For A(27.977 u)

Mass number = 27.977

Abundance = 78.21%

For B (28.976 u)

Mass number = 28.976

Abundance = 1.346%

For C(29.974 u)

Mass number = 29.974

Abundance = 20.444%

Averages atomic mass

= (Mass of A x abundance of A)/100 + (Mass of B x abundance of B)/100 + (Mass of C x abundance of C)/100

= (27.977x78.21)/100 + (28.976x1.346)/100 + (29.974x20.444)/100

= 21.8808117 + 0.39001696 + 6.12788456

= 28.40

In terms of genomics, a nucleus is the organelle within a cell that is membrane-enclosed and houses the chromosomes. The nuclear membrane has a variety of pores that enable the selective passage of specific molecules (such proteins and nucleic acids) into and out of the nucleus.

The nucleus carries the genes, structures that hold the genetic information, and controls and regulates the functions of the cell (such as growth and metabolism).Inside the nucleus, tiny structures known as nucleoli are frequently seen. The gel-like matrix in which the nuclear components are suspended is known as the nucleoplasm.

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Moles of vitamin c are present is 3.299 x 10^-5 mol

Sol:

12.69 mL x 1L/1000mL x 0.0053 M

What is mole?

A fundamental unit of measurement used by chemists is the mole. Chemists use moles to quantify extremely small substances like atoms, molecules, or other particles.

Simply put, a mole is a measuring unit. It's one of the International System of Units' seven foundation units, in reality. Units are created when preexisting ones are insufficient. At the same time that using absolute numbers of atoms, molecules, or ions would be unclear, chemical reactions frequently occur at low concentrations where using grams would be inappropriate.

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As a rule of thumb, the air leaving the evaporator will be about 17-20° cooler than the air entering the evaporator.

The refrigeration cycle can justify the above statement. The refrigeration cycle depicts the transfer of the heat.

Heat is rejected by the condensor and it is absorbed by the evaporator. The refrigerant when enters in the evaporator, it is a cold low pressure liquid. Then the refrigerant starts boiling and then soon evaporates. This evaporation creates a cooling effect and the heat is removed and carried to be dumped in condensor.

The heat which is removed from the air and flowing over the evaporator makes the air feel cooler. This cooler air is then blew back by the evaporator fan back into the space which is being cooled.

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Sulfides are the non silicate groups contains minerals that are commonly yellow in color, have a metallic luster, and contain important metal ores.

Metallic ores occur in all kinds of rock and some varieties of soil. The metallic minerals are concentrated into rich masses by igneous, hydrothermal, or erosional/weathering processes. Metals like chromium, platinum, nickel, copper, and iron can precipitate as sulfide minerals during a cooling body of magma.

Of the approximately 600 known silicate minerals, only some dozen—a group that includes the feldspars, amphiboles, pyroxenes, micas, olivines, feldspathoids, and zeolites—are significant in rock formation. The silicates, due to their abundance on Earth, constitute the foremost important mineral class.

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180° angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane.

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11.7 grams of oxalic acid dihydrate is needed to prepare 500.0 ml of a 0.185 M.

The amount of a solute per unit volume of a solution, or the concentration of a chemical species in a solution, is expressed as a solute's molar concentration.

The number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units, is the most widely used unit for measuring molarity.

500 ml of a 0185 M solution is prepared using x grams of oxalic acid dihydrate.

Oxalic acid dihydrate :- (COOH)₂ . 2H₂O

The molar quantity will be:

500 ml × 10⁻³ L / ml × 0.185 mol / L = 0.0925 mol with respect to oxalic acid dihydrate.

The molar mass of oxalic acid dihydrate (COOH)₂ . 2H₂O is 126.07 g / mol.

Therefore, the grams of the oxalic acid required will be:

= 126.07 g / mol × 0.0925 mol

= 11.661475 grams.

= 11.7 grams

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The value that would be different  for the hammer and the feather dropped from the same height is the the upward push of air resistance.

The term gravity has to do with the force that is exerted on a body as a result of its presence in the earth's gravitational field. When an object s falling down, the acceleration due to gravity acts on the object.

We know that irrespective mass, the acceleration due to gravity is the same on all the objects that are on earth. This is because all objects are accelerated to the same extent on the earth's gravitational filed.

Thus, the value that would be different  for the hammer and the feather dropped from the same height is the the upward push of air resistance.

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Answer:

The time it takes for them to fall.

Explanation:

I hope it help you.

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The proper order of chemical reactions of copper in the right phases is

1. Cu(s) 2. Cu(NO3)2 (aq) 3. Cu(OH)2 (s) 4. CuO (s) 5. CuSO4 (aq)  6. Cu(s)

What are the properties of copper?

One of the first metals that people used was copper. The primary causes of this are the fact that it is a native metal, meaning it can be found naturally in a usable state, and that it possesses advantageous metallurgical qualities. Malachite, cuprite, azurite, bornite, and chalcopyrite are other minerals that naturally include it.

Copper is softer than zinc and has a bright finish when polished. Along with silver and gold, it can be found in group Ib of the periodic table. Chemical reactivity is minimal for copper.

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The energy formed in a system by the motion of particles is called kinetic energy. which is half of the product of the mass and volume

k.E = mv^2/2

When someone is riding on an amusement ride also known as a roller coaster, due to the nature of the turns and slope, energy will change from potential to kinetic energy and it will be repeated a couple of times throughout the course of the ride.

The energy stored in the system when it's at a rest is called potential energy, the energy is converted into kinetic energy. when it starts moving. The potential energy is stated as the product of the mass, height, and acceleration due to gravity.

Normally, the amusement ride vehicles will be pulled up from the first hill by a chain and as the other vehicles follow that route in climbing, and they will then gain potential energy

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Chemists prefer the ribbon structures because they clearly elucidate the tertiary structure of proteins

The process of distillation depends on the boiling points of the substances The process depends on the fact that substances with different boiling points separate from the mixture at different temperatures.

1) If a mixture of acrylonitrile and ethyl acetate which have the same boiling point of  77.2ºC undergo distillation, there would be o separation as the two substances would be collected at once since they have the same boiling point.

2) We know that a proteins is a macromolecule, they have primary, secondary and tertiary structures. Chemists prefer the ribbon structures because they clearly elucidate the tertiary structure of proteins.

3) The reason why structural formulas are preferable for polymers is that they help us to deduce the properties of the polymer.

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Explanation:

density=mass÷volume

density= 560÷560

density= 1 g/mL

Volatile chemicals are agents that are able to change easily from a liquid into a gas.

What are volatile substances?

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The pH of this buffer after adding 2.5 ml of 10m KOH to the solution is 7.73

The HOCl/KOCl buffer has a pKa of 7.46. We can use the H-H equation to determine the pH of this buffer:

[tex]pH = pKa + log / \frac{[A^{-} ]}{[HA]}[/tex]

[tex]pH = 7.46 + log \frac{ [KOCl] }{[HOCl]}[/tex]

Where [] represents the molarity (or moles) of each compound.

Initial HClO and NaClO moles:

HOCl :-0.500L * (0.12mol / L) = 0.06 moles  HOCl

KOCl:- 0.500L * (0.080mol / L) =0.04 moles KOCl

HOCl now reacts with KOH to form KOCl:

[tex]HOCl + KOH ----- > KOCl + H_{2} O[/tex]

The moles of KOH in the reaction are as follows:

[tex]2.5x10^{-3} L * (10mol /L) = 0.025 moles KOH[/tex]

That is, 0.025 moles of HOCl are consumed and 0.025 moles of KOCl are produced after the reaction.

Following the reaction, moles are:

The final moles:

HOCl:- 0.06mol - 0.025mol = 0.035mol HOCl

KOCl :-0.04mol + 0.025mol = 0.065mol KOCl

Replacing in the H-H equation:

[tex]pH = 7.46 + log\frac{ [0.065mol] }{ [0.035mol]}[/tex]

pH = 7.73

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A neutral atom has a mass number of 80 and has 45 neutrons.

What is mass no.?

mass number The total of the protons and neutrons is how it is described. The atomic mass of a specific atom is nearly equivalent to the mass number.

For the given problem, we have mass no = 80

Now, we know that, mass no. = no. of (neutrons + protons)

Hence here, no of protons = 80-45 = 35,which is again equal to the no of electrons, which corresponds to the atomic no. of a specific element. Here atomic no 35 corresponds to Bromine atom and its symbol is Br.

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Because carbon dioxide is released during the reaction between acetic acid and sodium bicarbonate, the total mass of the beaker's contents decreases.

Acetic acid, systematically named ethanoic acid, is acidic, colorless liquid and organic compound with the chemical formula CH3COOH (also written as CH3CO2H, C2H4O2, or HC2H3O2). Vinegar is at least 4% acetic acid by volume, making the acetic acid the main component of vinegar apart from water and other trace elements.

Acetic acid is second simplest carboxylic acid (after formic acid) and its functional group is methyl. It is an important chemical reagent and industrial chemical, used primarily in production of cellulose acetate for photographic film, polyvinyl acetate for wood glue, and synthetic fibers and fabrics.

In the households, diluted acetic acid is often used in descaling agents. In food industry, acetic acid is controlled by the food additive code E260 as an acidity regulator and as a condiment. In biochemistry, acetyl group, derived from acetic acid, is fundamental to all forms of life. When bound to the coenzyme A, it is central to the metabolism of carbohydrates and fats.

The global demand for the acetic acid is about 6.5 million metric tons per year (t/a), of which approximately 1.5 t/a is met by recycling; the remainder is manufactured from methanol. Vinegar is the mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol.

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The total quantity of cresol solution is q1= 8.25.

Cresols (also hydroxytoluene or cresylic acid) are group of aromatic organic compounds. They are the widely-occurring phenols (sometimes called phenolics) which may be either natural or manufactured. They are also categorized as the methyl phenols. Cresols commonly occur as either solids or liquids because their melting points are generally close to the room temperature. Like the other types of phenols, they are slowly oxidized by exposure to air, and the resulting impurities often give the samples a yellow to brownish red tint. Cresols have an odor characteristic to that of the other simple phenols, reminiscent to some of a "coal tar" smell. The name "cresol" is an adduct of the phenol and their traditional source, creosote.

A flavorless, CH3COC6H3(CH3)OH, made from the gualac resin and beechwood tar, it is an active ingredient in creosote and is used as an antibacterial. Word genesis.

total quantity (q2) = 50ml

concentration of final solution

C2 = 1:150

     = 1/150* 100

     = 0.66%

quantity of stock * concentration of stock= quantity of final solution * concentration of final solution.

q1 * c1= q2 * c2

q1= 50*0.66/4

   = 8.25ml

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The major elimination product is 2-methylbut-2-ene and the structure can be seen as followed in the diagram attached.

An elimination reaction’s main byproduct is often the more substituted alkene. This is due to the lower energy and faster progressing transition state that leads to the more substituted alkene.

It is critical to first identify the electrophilic carbon in the substrate in order to determine the potential products. Next, list every hydrogen on every carbon that is next to the electrophilic carbon. Every distinct neighboring hydrogen has the potential to create a distinct elimination product.

The kind of atoms or groups of atoms that are expelled from the molecule is a frequent way to identify elimination reactions. The elimination of a halogen and an atom of hydrogen

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2.3 g of hexane is combusted in a bomb calorimeter.

What is combustion of hexane?

Hexane also engages in hydrocarbon combustion, forming carbon dioxide when combined with oxygen. The complete combustion of hexane yields the following chemical equation: The burning of hydrocarbons releases heat energy and is an example of an exothermic reaction.

Strong intermolecular interactions make up the non-polar, extremely volatile molecule known as hexane. It burns, releasing carbon dioxide and water as a byproduct.

2C6H14 + 19O2 → 12CO2 + 14H2O

Combustion of 1 mole of hexane releases 3800KJ of energy.

86 g hexane = 1 mole

Thus, 2.3 g hexane = 2.3/86 mole = 0.0267 mole.

Thus combustion of 0.0267 mole of hexane releases 3800*0.0267 KJ energy = 101.46 KJ energy. in a bomb calorimeter.

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Answer:

I think it is C. It takes courage to be the first to try something new.

Explanation:

The story showed her courage to the first to try something new.

Hope this helps! :)

The chemical group which is most likely to be responsible for an orgainc molecule behaving as a base is Amino group.

Amines are the nitrogen containing organic bases. Simple organic molecules such as methylamine, H₃N-CH₃, and ethylamine, H₃N-CH₂CH₃ are the bronsted bases.

Functional group is a group of atoms in molecule which have the different and separate chemical properties.  It provide certain characteristics to the molecule. The functional group gets attached to the carbon atom.

Functional groups can behave as a base or an acid. It relies in their structure's ability to accept or to donate the H⁺ ions.

Amino group is represented as :

Amino group has ability to accept the H⁺ ions from the solution, it forms NH₃⁺.

                  --NH₂ + H⁺ →  NH₃⁺

Therefore, Amino group is most likely to be responsible for an organic molecule behaving as a base.

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Answer:

299.25, or if you round it up 300

Formula to find kelvin: Celsius + 273.15 = Kelvin

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)

Answer:

of gravity

Explanation:

lmk if this is wrong

If a certain ore is 35.4% nickel by mass. To have 55.0 g of nickel, we have to dig up 0.155 kg of this ore.

Mass percent of Nickel = (mass of Nickel/mass oft he ore)×100

                                       = 35.4%

This means that in 100 g of ore we have 35.4 g of nickel.

So, 35.4 g of Nickel is present in = 100 g of the ore

1g of Nickel is present in = 100/35.4 g of the ore

55.0 g of Nickel is present in = (100/35.4) × 55.0 g of the ore

                                                 = 155.3 g of the ore

1 g = 1/1000 kg

155.3 g = 155.3/1000 kg

            = 0.155 kg

So, we need to dig 0.155 kg of the ore to get 55.0 g of Nickel.

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In joining two molecules by dehydration synthesis, a(n) hydroxyl (-OH) group is removed from one molecule and a(n) hydrogen (H) from the other

Dehydration reactions can be defined as the is the reaction in which a molecule of water is eliminated from the reactant molecule. here dehydration synthesis means the process of combination of two molecules with the elimination of water molecules. that's why hydroxyl (-OH) group is removed from one molecule and hydrogen (H)  loses from the other this two functional group are removed and then a new chemical bond then forms between the molecules.

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The molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution is 0.0770 mol/l.

The formula for molarity is,

M = n / V

where, M = molarity of solution

V = volume of solution in litres

where, n = given mass / molar mass

n = 14.1 /194.19

n = 0.0726

So, molarity is

M = 0.0726 / 0.942

M = 0.0770 mol/l

Therefore, molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution is 0.0770 mol/l.

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some compounds are often seen under uv light becasue they are inherently fluorescent and usually glow brightly due to presence of impurities

the light that a material emits when exposed to photons of a different wavelength. When exposed to UV radiation, a fluorescent object frequently emits light . The fluorescent properties of some deep sea fish and fireflies are samples of fluorescence in nature.

When a substance passes through fluorescence, it emits light after having absorbed light or other electromagnetic wave . B2 emits a yellow colour while fluorescing. tonic glows blue because it contains quinine. Benzimidazoles, benzothiazoles, coumarins, vitamins like cyanocobalamine, fluorene, and pentacene are samples of fluorescent materials.

When UV light bounces off objects that contain special substances called phosphors, interesting things happen. Phosphors are substances that emit visible light in response to radiation. Phosphors hit by UV light become excited and naturally fluoresce, or in other words, glow

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