Atomic Theory questions. Will be worth 50 points.

Answer:  Originally Answered: A sample of 0.892g of potassium chloride is dissolved in 54.6g of a water. What is the percent by mass of the potassium chloride in this solution?

Well, take the quotient…

0.892∙g0.892∙g+54.60∙g×100%  percentage by mass potassium chloride

≈2%

Explanation:

[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]

[tex]\\ \sf\longmapsto Acceleration=\dfrac{6-20}{6}[/tex]

[tex]\\ \sf\longmapsto Acceleration=\dfrac{-14}{6}[/tex]

[tex]\\ \sf\longmapsto Acceleration=-2.3m/s^2[/tex]

Answer:

Explanation:

EDMENTUM

The Lewis structure for ozone contains a central oxygen atom that has a double bond to one oxygen atom and a single bond with the other oxygen atom. The resonance structure of the ozone is shown in the attached figure below.

The oxygen molecule has a valency of -2. It can form two-sigma bonds or covalent bonds with the other atoms. Oxygen contains three lone pairs to form π bonds with other atoms. Ozone contains all three oxygen atoms and is a dihedral molecule with sp² hybridization.

Lewis structure is generally based on the octet rule which states that there should be eight electrons in the valence shell or orbit of an atom for a stable molecule.

The lone pair on the central oxygen atom repels the electrons in the two side bonds and adopt a bent molecular geometry. The expected geometry is the trigonal planar with a bond angle is 120°.

In an ozone molecule, six valence electrons for each molecule of Oxygen so the total number of valence electrons is 6 × 3 = 18. As both Oxygen atoms on the sides have the same electronegativity, therefore, the double bond keeps on shifting from both causing resonances.

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Answer:

Because you could die or get seriously burn bad

Answer:

Radiation protection aims to reduce unnecessary radiation exposure with a goal to minimize the harmful effects of ionizing radiation. ... As radiation exposure becomes more prevalent, a thorough understanding of radiation exposure risks and dose reduction techniques will be of utmost importance.

Explanation:

Answer:

The answer is Aluminium.

Explanation:

It has low density, is non-toxic, has a high thermal conductivity, has excellent corrosion resistance and can be easily cast, machined and formed. It is also non-magnetic and non-sparking. It is the second most malleable metal and the sixth most ductile.

Answer:

a.MgO

b.CaO

c.SO2

d.Na2O

e.CO2

Answer:

H2(g) + MgCl2 (aq)

Explanation:

Answer:

SUSPENSION IS A KIND OF MIXTURE where particlea are visible to the naked eyes AS IT settled AT THE BOTTOM WHEN LEFT UNDISTURBED.

The history of the atom passed through a certain sequence until our recent interpretation of atomic theory.

The correct sequence of atomic theory is;

The beginning of the atomic theory saw the discovery of J.J Thompson which led to the plum - pudding model in which the atom was described as a sphere in which electrons are stuck in an overall  positive atom.

This was followed by Rutherford's planetary model in which he concluded that the atom has a small dense positive  nucleus. This was followed by the model of Bohr in which the electrons exist in perfect orbits based on  energy levels.

Lastly, the contemporary model of the atom is called the wave - mechanical model in which electrons exist in orbitals, or the most  probable location.

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Answer:

valence electrons

Explanation:

Answer:

Ni

Explanation:

Electronic configuration given by

[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^8[/tex]

Element is nickel

Answer:

C=37.5% H=4.2% O=58.3%

Explanation:

molar mass of element / molar weight of compound X 100% (for each element)

C mass = 12 x 6 = 72

H mass = 1 x 8 = 8

O mass =16x 7 = 112

Molar weight of compound = 192

72/192(100%)= 37.5% C

8/192(100%) = 4.2 % H

112/192 (100%) = 58.3% O

The mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇ is C = 37.5% H = 4.2% O = 58.3%.

The concentration of an element in a compound or component in a combination is calculated by the mass percentage.

The collective of a component is divided by the entire mass of the mixture to obtain the mass percentage, which is then multiplied by 100%.

Given, finding the mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇

the molar mass of element / molar weight of compound X 100% (for each element

First, calculate the molar mass of the elements given in the compound.

C mass = 12 x 6 = 72

H mass = 1 x 8 = 8

O mass =16x 7 = 112

Molar weight of compound = 192

72/192(100%)= 37.5% C

8/192(100%) = 4.2 % H

112/192 (100%) = 58.3% O

Thus, the mass percentage is C = 37.5% H = 4.2% O = 58.3%.

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Answer:

The number of energy levels will increase.

Explanation:

As they are all Noble Gases, they are all in the same family. However, as you go further down the list of Noble Gases, the period number increases. The period number shows the number of energy levels. Hence, an increase in energy levels.

The size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.

Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element, typically from the nucleus to its valence electrons.

Generally, the atomic radius of a chemical element decreases across the periodic table, from alkali metals (group 1 elements) to noble gases (group 8 elements). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

In this context, the size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.

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Answer:

D

Explanation:

The statement that best explains why the table is incorrect is: Grass is a soluble substance. Option C is correct.

In the table, grass is listed under "Insoluble," but in reality, grass is not a substance that dissolves in water. It is a complex mixture of various compounds, including cellulose and other organic materials, which are not water-soluble. Grass does not dissolve when added to water; instead, it remains intact and is not readily soluble.

On the other hand, all the other substances listed in the table are correctly categorized. Sugar, food coloring, and honey are soluble substances because they dissolve in water. Sand and salt are insoluble substances because they do not dissolve in water.

Hence, C. is the correct option.

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Answer:

2NaOH(aq) + CaBr2(s) → Ca(OH)2(s) + 2NaBr(aq)

The given chemical equation depicts chemical reaction of double displacement type and it's balanced chemical equation is  2 NaOH + CaBr₂ [tex]\rightarrow[/tex] Ca(OH)₂ +  2 NaBr.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The atomic mass constant (symbol: mu) is defined as being 112 of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative.

Answer:

it wants you to conclude what you have learned by writing if you think there is a  link between the impact and the extinction of the dinosaurs by stateing any  similarities to the two events and provide evidence to surpport your claim  

Explanation:

Answer:

C

Explanation:

Answer:

The calcium sulphate is insoluble in dilute sulphuric acid and so you end up with calcium carbonate coated in a layer of calcium sulphate, which stops the acid from getting at the carbonate and so stops the reaction. so you would not get any completion .

One mole of every substance contains 6.022×10²³ number of atoms. One mole carbon have these much atoms and thus number of moles of carbon having 8.7 × 10²³ atoms is 1.44 moles.

Carbon is 6th element in periodic table. It is a p block element and is a non-metal. Carbon forms covalent bonds with other elements.

One mole of every elements contains 6.022×10²³ number of atoms and it is called Avogadro number. Similarly one mole of a compound contains 6.022×10²³ number of molecules.

The number of atoms in one mole of carbon is 6.022×10²³.Therefore, number of moles of carbon which contains 8.7 × 10²³ atoms is calculated as follows:

number of moles of carbon = 8.7 × 10²³/6.022×10²³

                                              = 1.44 moles.

Therefore, the number of moles of carbon containing 8.7 × 10²³ atoms is 1.44 moles.

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Answer:

May i ask what is the question?

Explanation:

Answer:

X. 80°

Explanation:

if the substance is below -38 then it is in the solid phase (-100° and -50°) and if it is above 356° it is a gas (375°). Therefore anything in the middle is a liquid, 80°.

Given that the substance freezes at  –38°C and boils at 356°C, it will be a liquid at  a temperature of 80°C.

The term liqiid range refers to the temperatire range within which a substance remains in its liquid state. Now we are told that the substance freezes at –38°C and boils at 356°C.

Hence, we expect that this substance will be in the liquid state at a temperature of 80°C.

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Answer:

the reactor was overheating

The salt whose aqueous solubility will most likely to change the pH of the solution is CaF2(aq).

The pH of a salt solution depends on the nature of the acid and base that forms the salt.

Since HF is a weak acid, its salt CaF2 will be slightly basic when dissolved in water hence the pH of the solution is altered.

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Answer:

It looks like 43 to me, so 43 ml?

Explanation:

I'd say that's 43ml

Hope this helps- have a good day bro cya)