what is the answer to this question

Answer: Its D the last one.

Explanation:

Answer: I believe it’s d but I will come back and tell you if it’s wrong

Explanation:

Answer:

In neutral oxygen atom 8 electrons are present

Explanation:

The statement which is true about the valence electrons of cesium and calcium is as follows:

Thus, the correct option for this question is B.

Valence electrons may be defined as the number of electrons that are present in the outermost shell of any element. For example, Sodium has an atomic number of 11. Its electronic configuration is 2, 8, and 1. Here, one electron is present in the outermost shell, so, sodium has only one valence electron.

According to the electronic configuration, it is found that cesium has only one valence electron, while calcium has two. So, the number of valence electrons is more in calcium as compared to cesium.

But, the valence electron found in cesium is at a higher energy level due to the completed d-orbital.

Therefore, the correct option for this question is B.

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[tex]sp^{3}[/tex] orbital have less electron density than p orbital. Therefore on overlap of s orbital with [tex]sp^{3}[/tex] less repulsion take place than overlapping of sp3 orbital.

Electronegativity depends on s character.

In [tex]sp^{3}[/tex]  there is hybridization between one s and 3 p orbital. Therefore,   [tex]sp^{3}[/tex]have 25% of s character .

In p orbital , there is no s orbital present. Therefore s character is p orbital is [tex]0[/tex]% .

Higher the electronegativity means higher tendency to attract electron.

Thus, bond form by overlap of [tex]sp^{3}[/tex] and [tex]s[/tex] will be stronger than bond formed by overlap of [tex]s[/tex] with [tex]p[/tex].

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Answer:

My best guess would be organic compounds, good luck.

The term "organic" best describes the compound with chains of carbon atoms.  

Option (D) is correct.

Organic compounds are characterized by containing carbon-hydrogen (C-H) bonds and often involve complex carbon-based structures. These compounds are typically associated with living organisms and are essential building blocks of life.

The presence of chains of carbon atoms indicates a molecular structure based on carbon-carbon bonds, which is a fundamental feature of organic compounds. In contrast, inorganic compounds generally lack carbon-hydrogen bonds and are typically simpler substances. Terms like "polar," "ionic," and "inorganic" do not specifically capture the essence of a compound consisting of carbon chains.

Therefore, the term "organic" accurately represents the nature of the compound and its connection to carbon-based chemistry and living systems.

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The question is incomplete. The complete question is:

A compound contains chains of carbon atoms.

Which term best describes this compound?

A) polar

B) inorganic

C) ionic

D) organic

Answer:

42 19 K→42 20 Ca+e−

Explanation:

Naturally-occurring potassium atoms have a weighted average atomic mass of 39.10 (as seen on most modern versions of the periodic table.) Each potassium atom contains 19 protons p+ and thus an average potassium atom contains about 39.10−19≈20 neutrons n0.

This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.

2NaCl + MgO → Na₂O + MgCl₂ and 2H₂ + O2 →2H₂O the correct formulas that indicate only a physical change has taken place

In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition

2NaCl + MgO → Na₂O + MgCl₂ has change the color as well as appearance and in the 2H₂ + O2 →2H₂O has also change in the physical changes

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Answer:

Atomic number

Protons

Explanation:

Elements generally have specific atomic number of protons they are made up of.

An element is a distinct substance that cannot be split-up into simpler substances. Such substance are made up of only one kind of atom.

Answer:

did you have options, cause if you did chose something alond the lines of

Explanation:

A real gas is a gas that does not behave as an ideal gas due to interactions between gas molecules. A real gas is also known as a nonideal gas because the behavior of a real gas in only approximated by the ideal gas law.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 40 × 2

We have the final answer as

Hope this helps you

Answer:

Explanation:

Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties.

Answer: Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine and Bromine

Explanation:

Answer:

Silver Ag

Explanation:

Answer:

"Alpha radiation is the name for the emission of an alpha particle in fact an helium nuclei, beta radiation is the emission of electrons or positrons , and gamma radiation is the term used for the emission of energetic photons

Answer:

Alpha radiation is the name for the emission of an alpha particle in fact an helium nuclei, beta radiation is the emission of electrons or positrons , and gamma radiation is the term used for the emission of energetic photons.

Explanation:

Gamma Radiation

Frequently, gamma ray production accompanies nuclear reactions of all types. In the alpha decay of U-238, two gamma rays of different energies are emitted in addition to the alpha particle.

U92238→He24+Th90234+2γ00(17.3.4)

Virtually all of the nuclear reactions in this chapter also emit gamma rays, but for simplicity the gamma rays are generally not shown. Nuclear reactions produce a great deal more energy than chemical reactions. Chemical reactions release the difference between the chemical bond energy of the reactants and products, and the energies released have an order of magnitude of 1×103kJ/mol. Nuclear reactions release some of the binding energy and may convert tiny amounts of matter into energy. The energy released in a nuclear reaction has an order of magnitude of 1×1018kJ/mol. That means that nuclear changes involve almost a million times more energy per atom than chemical changes!

Beta radation

Beta radiation consists of high energy electrons emitted from the nucleus. These electrons have not come from the electron shells or energy levels around the nucleus. Instead, they form when a neutron splits into a proton and an electron.

Characteristics of Beta Radiation

Key characteristics of beta radiation are summarized in following points:

Beta particles are energetic electrons, they are relatively light and carry a single negative charge.

Their mass is equal to the mass of the orbital electrons with which they are interacting and unlike the alpha particle a much larger fraction of its kinetic energy can be lost in a single interaction.

Their path is not so straightforward. The beta particles follow a very zig-zag path through absorbing material. This resulting path of particle is longer than the linear penetration (range) into the material.

Since they have very low mass, beta particles reach mostly relativistic energies.

Beta particles also differ from other heavy charged particles in the fraction of energy lost by radiative process known as the bremsstrahlung. Therefore for high energy beta radiation shielding dense materials are inappropriate.

When the beta particle moves faster than the speed of light (phase velocity) in the material it generates a shock wave of electromagnetic radiation known as the Cherenkov radiation.

The beta emission has the continuous spectrum.

A 1 MeV beta particle can travel approximately 3.5 meters in air.

Due to the presence of the bremsstrahlung low atomic number (Z) materials are appropriate as beta particle shields.

Answer:

C

Explanation:

In the chemical  equation of cellular respiration, C₆H₁₂O₆  is not a product of cellular respiration.

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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Answer:

A ball of gas flying or a meter...

Explanation:

Answer: 66 atoms, I believe.

5.5 times 12/dozens  + 66 Atoms

Hope this helps!

(5.5 dozen) x (12 atoms/dozen) = 66 atoms

The height of the given iron plate is 20.41m

Potential energy is the energy that is acquired  by an object due to its position or configuration. If we consider that 'm' to be the mass of the object and it is placed at a height 'h' above the horizontal surface, then the P.E. , 'P' of the thing is given by the equation:

                          P = mgh

where, g is that the acceleration due to gravity.

From the above equation height could be calculated as:

                         h = P /mg

From the question it might be clearly seen that,

   P = 2000 J ; m = 10 Kg and allow us to consider g = 9.8 m/s²

            h = 2000 / (10 * 9.8)

         ∴ h = 20.41 m

Therefore, the height of the given iron plate is 20.41m

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The molarity of a solution : 1.13 M

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

mass HCl = 1.25 g

mol HCl(MW=36.5 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{1.25}{36.5}\\\\mol=0.034[/tex]

Volume of solution = 30 cm³ = 0.03 L

The molarity :

[tex]\tt M=\dfrac{0.034}{0.03}\\\\M=1.13[/tex]

Answer:

D. Carbon

Explanation:

Graphite, archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure. You'll get the substance when carbon is stacked in sheets. It occurs naturally in this form and is the most stable form of carbon under standard conditions. Under high pressures and temperatures, it converts to diamond. Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels.

Considering the definition of atomic mass, isotopes and atomic mass of an element, sb121 has a percent natural abundance of 0.5726 or 57.26% and sb123 has a percent natural abundance of 0.4284 or 42.84%.

The atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

Isotopes are the chemical elements in which atomic numbers are the same, but the number of neutrons is different.

The atomic mass of an element is the weighted average mass of its natural isotopes.

This is, the atomic masses of elements are usually calculated as the weighted average of the masses of the different isotopes of each element, considering the relative abundance of each of them.

In this case, antimony has two naturally occuring isotopes, sb121 and sb123. You know:

The average mass of antimony is expressed as:

121.7601 u= 120.9038 u x + 122.9042 u× (1 -x)

Solving:

121.7601 u= 120.9038 u x + 122.9042 u - 122.9042 u x

121.7601 u - 122.9042 u= 120.9038 u x - 122.9042 u x

(-1.1441 u)= (-2.0014) x

(-1.1441 u)÷ (-2.0014)= x

0.5726= x or 57.26%

So, 1 -x= 1- 0.5716 → 1-x= 0.4284 or 42.84%

Finally, sb121 has a percent natural abundance of 0.5726 or 57.26% and sb123 has a percent natural abundance of 0.4284 or 42.84%.

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The least net force applied : Car 3(12 N)

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object  

∑F = m. a  

Car 1 ⇒m=0.5 kg, a=36 m/s²

[tex]\tt \sum F=0.5\times 36=18~N[/tex]

Car 2⇒m=0.8 kg, a=50 m/s²

[tex]\tt \sum F=0.8\times 50=40~N[/tex]

Car 3⇒m=0.6, a=20 m/s²

[tex]\tt \sum F=0.6\times 20=12~N[/tex]

Car 4⇒m=1, a=19~m/s²

[tex]\tt \sum=1\times 19=19~N[/tex]

Answer: The reactants are baking soda and vinegar. Baking soda is a white powder, and vinegar is a clear liquid. The products of this reaction are carbon dioxide, water, and sodium acetate. Carbon dioxide is a colorless gas, water is a colorless liquid, and sodium acetate is a white crystalline powder.

A chemical change can be seen in how the molecular formulas of the products are different from the reactants, since the reactants have chemically changed into completely different molecules.

Hope this helps

Answer:

A) An oxygen atom shares an electron pair with each H atom.

Explanation:

The percent iron in the sample of ore is 27.30% .

The mass of Fe₂O₃ contains both iron and oxygen. First, we determine the amount of iron present in this compound. Then, when the mass of iron is conserved, the amount of iron present in the original ore will be the same.

Percentage iron in Fe₂O₃ = (2 * 56) * 100 / (2 * 56 + 3 * 16) = 70%

Therefore, out of the 13.3 grams of Fe₂O₃,

13.3 x 0.7 = 9.31 grams is iron

In the original ore, the percentage of iron is given by:

(9.31 x 100) / 34.1

The original ore had 27.30% iron.

A distinct substance created by the chemical union of two or more ingredients in a predetermined weight proportion to create a new antibiotic compound is an example of something that is created by the union of elements or parts.  a word made up of parts that are words (such as rowboat, high school, devil-may-care).

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Answer: C

Explanation:

Clocks and watches are made out of Quartz