Question 8
Which one of the following salts does not contain water of crystallisation?​

Answer:

refaction reflection

Explanation:

i think that is what it is called

Explanation:

When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it ‘bends’ more towards the normal line. But Reflection occurs when light traveling through one material bounces off a different material. The reflected light continues to travel in a straight line, but in a different direction.

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The average atomic mass of boron is derived from the isotopic masses and percentage abundance. The average atomic mass of boron is 10.7 amu.

Isotopes are atoms of same element with different atomic mass numbers. Almost all elements have two or more isotopes but not all of them are stable in nature.

The average atomic mass can be calculated from the isotopic mass and and percentage abundance as follows:

atomic mass = ∑ (isotopic mass × %abundance /100 )

Apply the isotopic mass and abundance of all isotopes given as follows:

atomic mass of neon = (30/100 × 10 amu) +  (70/100 × 11 amu)  = 10.7 amu

Therefore, the atomic mass of boron is 10.7 amu.

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It can be inferred that due to the relatively slight difference in electronegativity between carbon and hydrogen, and because of its symmetrical tetrahedral shape, methane CH4 is a nonpolar molecule.

Methane is a colorless, odorless gas that occurs naturally in large quantities and is also a byproduct of some human activities. Methane is the most basic hydrocarbon in the paraffin family and one of the most potent greenhouse gases. It has the molecular formula CH4.

Methane is the second most prevalent anthropogenic GHG after CO2, accounting for approximately 20% of world emissions. Compared to carbon dioxide, methane traps heat in the atmosphere 25 times more effectively.

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Answer:

1 mol of CO2 or 40.01 g contains 6.022*10^23 molecules.

Then 5.5 g of CO2 will contain (5.5/40.01) *6.022*10^23 or 8.3*10^22 molecules

Explanation:

Answer:

The number 6 refers to the atomic number c. The numbers 12, 13, and 14 refer to the atomic mass d.

Explanation:

In this structure 6 represents atomic number that is the number of electrons or the number of protons and 13 represents the mass number (A). The number of neutrons (N) = mass number (A) − no. of electron or no. of proton. Hence N=13−6=7.

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Answer:

The number 6 refers to the atomic number c. The numbers 12, 13, and 14 refer to the atomic mass d.

Explanation:

Nuclear processes alter the sorts of atoms present, but chemical reactions do not. The electrons in the atom play a significant role in chemical reactions when nucleus reactions occur in atom nuclei.

The energy found in an atom's nucleus, or core, is known as nuclear energy. Energy maintains the nucleus of atoms together, the minuscule units that make up all matter in the universe. The dense nucleus of an atom has an enormous quantity of energy.

The most lethal weapons on earth are nuclear weapons. One can wipe out an entire metropolis, perhaps killing millions of people, endangering the ecosystem and the lives of future generations due to its long-term devastating impacts.

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Genetic modification of crops and food have both advantages and disadvantages. These techniques create desired characteristics in crops but latter that might affect our health as well.

Plants and animals can be genetically modified to create desired characteristics in them. Gene techniques such as CRISPER are nowadays becoming popular in agricultural field.

Features such as rapid growth, extra production, coloring, change in size, antibacterial properties, climate survival etc. can be imparted to plants by genetic engineering.

However, genetically modified crops make some health issues some times. It has been reported that, some genetically modified vegetables causes sever health impacts.

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Copper is mostly utilized in generators, house and auto wiring, as well as the cables in gadgets like radios, TVs, computers, lighting, and motors due to its flexibility and good conductivity.

The expenses of legacy health care and company pensions were also fixed. Therefore, many costs remained largely same as revenues declined. This resulted in losses. Due to the mounting losses and the weakening economy, GM was no longer able to operate as a profitable company.

Who is the GM Company's owner? Stockholders, 12.56% General Motors Co. insiders, plus 7.47% retail investors collectively own 79.97% of General Motors Co. (NYSE: GM). The largest individual Ford Motor Co. fund is Retired person Medical Benefits Trust UAW.

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The chemical molecule (C6H5)2CO, also referred to as Ph2CO, is benzophenone. The solid is white and dissolves in organic solvents.

Some flowering plants contain benzophenone-3 (BP-3), a substance that occurs naturally. The sun's dangerous ultraviolet (UV) rays are absorbed and scattered by BP-3. It is created to be used as sunblock in lotions, shampoos, and cosmetics for this reason.

Organ System Toxicology Because that including can cause liver enlargement in rats at lower doses, it (Environmental protection agency) lists it as a recognized toxicant. Oxybenzone can penetrate the skin, build up in the blood, kidneys, and liver, and could be harmful to liver cells.

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The correct answer is

what is  the structure of benzophenone ?

If a car takes 5 seconds to increase its speed from 2 m/s (4.5 mph) to 18 m/s (40 mph), then its acceleration in m/[tex]{s}^2[/tex] is 16 m/[tex]{s}^2[/tex], as it is found by subtracting the final velocity from the initial and dividing by the time.

It explains how the velocity of a car changes over time and can be calculated by subtracting the final velocity from the initial and dividing by the time; the calculation is given below.

acceleration (a) = (final velocity - initial velocity) / time

a= 18 m/s - 2 m/s / 5 sec

a=16 m/[tex]{s}^2[/tex]

Hence, if a car takes 5 seconds to increase its speed from 2 m/s (4.5 mph) to 18 m/s (40 mph), then its acceleration in m/[tex]{s}^2[/tex] is 16 m/[tex]{s}^2[/tex], as it is found by subtracting the final velocity from the initial and dividing by the time.

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The frequency of a wave in kilohertz is 6.74 x 10^35 kilohertz

It is given that

Energy of wave = 45 x 10 kilojoules

Then the connection between the energy and frequency of a photon is remarkably simple

Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity, and is distinct from angular frequency. Frequency is measured in hertz (Hz) which is equal to one event per second.

The energy equation is a direct relationship between frequency and energy because as frequency increases, so does energy.

E = h × f

where h = 6.67 × 10^-34 joule

45 x 10 kilojoules = 6.67 × 10^-34 joule x f

f = 6.74 x 10^35 kilohertz

Hence, frequency of a wave in kilohertz is 6.74 x 10^35 kilohertz

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Among all the given options, the correct option is option A that is Light causes the same change to all materials. there are so many phenomenon that is attached to light.

Electromagnetic radiation that is visible to the human eye is referred to as light rays. The wavelengths of low energy radio waves, which are measured in meters, and high energy gamma rays, which have wavelengths smaller than 1x10-11 meters, are all included in the electromagnetic spectrum in its entirety.

The lowest unit of energy that is capable of moved is a photon, as well as the discovery because light can move in discrete quanta gave rise to quantum theory.

Therefore,  the correct option is option A.

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Answer:Sea floor spreading is the phenomena of new sea floor being created through mid-ocean ridges. Wegener proposed that the continents themselves move, which is untrue. It is the tectonic plates that move. Sea floor spreading caused the break up of Pangea, which prompted Wegener to add this in support of his continental drift theory.

Explanation:

Answer: Solar Energy Chemical Energy

Explanation:

Dilution is being carried out by the chemist. The solution's volume may be MiVi=MfVf at the end. To make 78.3 mL from 249 mM aqueous chemist would dilute it. water-soluble potassium dichromate

Liquid water is the solvent in an aqueous solution. Solute (dissolved) protons and molecules are encircled by molecules of water and absorbed into the web of bonds in the water, in other words.

The word aqueous, which derives from the Latin word aqua, denotes being or consisting of water. Water is a common solvent in chemistry since it works great as a solvent as well as being readily available.

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The amount of H2S formed in the reaction of 0.4 mol of HCl with excess Sb2S3 is 1.2 moles.

To calculate the amount of H2S formed when 0.4 mol of HCl reacts with excess Sb2S3, we need to use the balanced equation for the reaction:

Sb2S3 + 6HCl -> 2SbCl3 + 3H2S

From the balanced equation, we can see that for every mole of Sb2S3, 3 moles of H2S are produced.

We have the number of moles of HCl which is 0.4 mol, and we know that HCl is in excess. So we can assume that the reaction is limited by the amount of Sb2S3.

Therefore, the number of moles of H2S produced is:

0.4 mol Sb2S3 × (3 mol H2S / 1 mol Sb2S3) = 1.2 mol H2S

So, the amount of H2S formed in the reaction is 1.2 moles.

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Actual voltages on a molecule's atoms are represented by formal charges.The most likely Preliminary design for a given chemical can be found using the formal charge.

A formal charge is the charge that is given to an atom in a molecule on the assumption that all chemical linkages involve an equal sharing of electrons between the two atoms without consideration of relative electronegativity. Following is the formula for determining an atom's formal charge in a Lewis structure:

Colloquialisms, contractions, and first-person pronouns like "I" or "We" are not used in formal language. Informal speech is more relaxed and unplanned. When speaking with family or friends, it is utilized.

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Answer:

Evaporation

Explanation:

Evaporation is the process by which a liquid changes to a gas below the boiling point of the liquid.

La Niña typically brings cooler than normal summer weathers temperature to North Carolina. It can also bring more frequent and intense storms to the region.

What is weather?

Weather is the state of the atmosphere at any given time, including temperature, air pressure, humidity, precipitation, cloudiness, and wind. It is the sum of all atmospheric conditions in a given area over a short period of time. Weather is responsible for the daily changes in the atmosphere, such as storms, droughts, and floods. Weather is affected by seasonal and geographical factors, such as latitude, altitude, and proximity to water sources. Weather provides information about the environment, such as visibility, air quality, and the presence of pollutants. Weather can also influence the spread of disease and natural disasters, as well as the growth of plants and animals.

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Better batteries deals with Rechargeable lithium batteries are in the research phases where commercial usage of some of the new types of batteries is not possible so far.

These batteries have the potential to power portable electronics of today's time. It can store more energy in any given volume and leads to longer battery life. By changing the electrolyte composition it has made it safe for long term use. However these changes are not able to reflect on commercial scale.

Currently battery engineers are looking at improving use of these batteries in smart grid and electrical transports. For instance, researchers find that the energy density of lithium-sulfur (Li-S) batteries is five times higher in comparison to Li-ion batteries. Even they are most cost effective. But there is a major challenge of dropping voltage rapidly with use.

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Oxygen Consider the following improper equation: O2 → CO2 + Oxygen ( o2 + C6H14 How much carbon dioxide (CO2) could be created by combining 11.2 g of C6H14 with 37.9 g of extra oxygen.

Carbonic acid, or H2CO3, is created when CO2 and water combine. This acid is in mixture with co2 (HCO3-) and h+ (H+). The following phase of the reaction is influenced by changes in the concentrations of reactants on either of the equation's sides.

Billion British thermal unit (MMBtu) are converted to therms, and then the carbon coefficient, the fraction oxidized, and the proportion of the molecular mass of atmospheric co2 to carbon  are multiplied to get the greenhouse gas emissions per therm.

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Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of the element is 68.636.

The atomic mass of an atom is equal to the sum total of protons and neutrons in the nucleus.

Isotopes are atoms whose atomic nuclei have the same number of protons but a different number of neutrons. This is, the atomic numbers are the same, but the number of neutrons is different.

The atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, you know:

The average mass of the element is calculated as:

average mass=  68 ×0.565 + 69 ×0.234 + 70 ×0.201

average mass= 68.636

Finally, the atomic mass of the element is 68.636.

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The balance equation for this reaction is 2Fe (s) + 3Cl₂ (g) → 2FeCl3 (s) 45.1grams of iron(III) chloride (FeCl3) result when 15.5 g of iron (Fe) is reacted with an excess of chlorine gas.

The balance chemical equation in which reactant are exactly equal to the product.

The balance equation for this reaction is 2Fe (s) + 3Cl₂ (g) → 2FeCl3 (s)

2 mole Fe = 2 mole FeCl₃

molar ratio = 2 mole FeCl₃ / 2 mole Fe

Atomic mass of Fe = 55.85g/mol

Thus,15.5mg of iron = 15.5mg × 1.0g / 10 ³mg

15.5 × 10 ⁻³gFe

= 2.78 × 10 ⁻⁴  mole of Fe

The molar mass of a FeCl₃ = 162.2g/mol

Therefore, amount of FeCl₃ produced = 0.0451g

= 45.1 mg

Thus, 45.1grams of iron(III) chloride (FeCl3) result when 15.5 g of iron (Fe) is reacted with an excess of chlorine gas.

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The elements of Group 18 (helium, neon, argon, krypton, xenon, and radon) are called the noble gases. They are an especially important group of the periodic table because they are almost completely unreactive, due to their completely filled outermost s and p sublevels.

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Answer 1

The average atomic mass in a.m.u of Element X given this information is 122.358.

Answer 2

Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure.

Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his  model of the atom, the structure of the nucleus became more well-defined following the discovery of protons (1919) and neutrons (1932) as the particle constituents of the nucleus.

Answer 3

The percent abundance is related to the number fraction as fi = Pi/100  and used as in the formula written above in order to find average mass

Atomic structure refers to the structure of an atom comprising a nucleus (centre) in which the protons (positively charged) and neutrons (neutral) are present.

The average atomic mass in a.m.u of Element X given this information is ((121 * 43.2) + (123 * 53.1) + (129 * 3.70)) / 100

=5227.2 + 6531.3 + 477.3

=12235.8 / 100

122.358

Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure, and Rutherford's model of the atom was proposed as a small, positive, massive nucleus contains the very vast majority of the mass of the entire atom with negatively charged electrons surrounding it at relatively large distances.

Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his  model of the atom, the structure of the nucleus became more well-defined following the discovery of protons in 1919 and neutrons in 1932 as the particle constituents of the nucleus.

It was during the 1920s that a "wave mechanical model" came along through the work of several physicists most importantly de Broglie, Heisenberg, and Schrodinger) and Bohr's concept of electrons "orbiting" the nucleus was abandoned in favor of "orbitals" which are more abstract probabilistic representations of electronic structure within an atom.

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The boiling point of the solution in number 12 would be 100.624 °C.

The boiling point of a solution depends on many factors, including the concentration of the solute and the nature of the solvent. The value you provided (Kb of water = 0.512 °C/m) is the molal boiling point elevation constant, which is used to calculate the change in boiling point of a solvent when a solute is added. Using the molar boiling point to multiply the number ascribed to the degree Celsius of the solution which is 12 plus the boiling point of water. which is 100..

Therefore, the correct answer is as given above

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Answer:

The reactants

Explanation:

Car as well as truck engines emit fumes (smoke) that contain carbon monoxide. tinier gasoline engines Fu el burning space warmers (not electric).

The inhalation of combustion gases might result in carbon monoxide pois oning. Your body substitutes carbon monoxide for the oxygen in human red blood cells whenever you have too enough carbon monoxide in the air you are breathing. Due to this, oxygen cannot reach your bo dy's tiss ues as well as org ans.

The majority of CO- poiso ning deaths are due to fires, although about one-third are also brought on by stoves, portable heaters, as well as car exhaust. These are frequently linked to exhaust system problems or obstructions, as well as suic ide attempts.

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