Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/4.00 of the original amount. How long ago was this plant alive?

The bond between K⁺ and Cl⁻ ions is an ionic bond

Atoms have different stability. Unstable atomic atoms will try to form stable electron configurations like those of noble gases. Where noble gases have the number of outer electrons 2 or 8

The formation of electron configurations such as noble gases can be done by forming shared ions or electron pairs

Atoms with high ionization energy and atoms that are difficult to draw electrons will form bonds with shared electron pairs (electrons can be from one atom or two atoms attached)

Inform ions, atoms will release or attract electrons

Ion bonds occur because atoms that have low ionization energy (easily release electrons) form a + ion, and these electrons are bound by atoms that have large affinity energy (easily pulling electrons)

Generally, ionic bonds occur in metals and nonmetallic elements. Metal elements have low ionization energy and non-metallic elements have a high electron affinity

In Atoms, to achieve stability, K will release one electron so that it has an electron configuration like noble gas Ar

Electron configuration of K (atomic number 19) and Ar (atomic number 18)

K: 2 8 8 1

Ar: 2 8 8

so that it becomes a K⁺ ion

While the Cl atom will bind one electron, so it has an electron configuration like noble gas Ar

Cl: 2 8 7

Ar: 2 8 8

So that it becomes a Cl⁻ ion

Finally, there will be an attractive attraction between positive and negative ions and KCl is formed

So the bond between K + and Action is an ionic bond

the octet rule

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a noble gas

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ionic bonds and covalent bonds

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The Answer is Al.

It is an outer shell electron with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

So, the valence electrons are 3 in the case of Al.

Hence, the correct option is Al.

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The atmospheric pressure decreases as one goes from beach to mountains because as altitude increases, pressure decreases because of the inverse relation between them.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

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Answer: The compound represents aluminium iodide is AlI3.

Explanation:

The atomic size along period in periodic table decreases whereas down a group, the atomic size increases due to the addition of more energy levels.

The atomic size is considered to be the distance from the nucleus to the valence shell of the atom. The size of an atom depends on the nuclear charge, number of electrons and number of shells.

Along a period, the atomic size is decreasing this is because, the nuclear charge is increasing with an increase in atomic number and no increase in number of shell. Thus, electrons are occupying within the same energy level and experience more nuclear attractive pull results in smaller size.

Down a group the number of principal shell increases Thus the valence electrons are getting far apart from the nucleus and the valence electrons are more screened by the inner electrons. Therefore, the atomic size increases.

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Geologic formations such as new rivers, valleys, lakes, and unique erosional structures like hoodoos can separate organisms and lead to speciation. The likelihood of this depends on the organisms' dispersal abilities.

In addition to canyons, other geologic formations that might separate similar organisms and lead to allopatric speciation include the formation of new rivers, valleys through erosion, or lakes. For instance, if rodent populations were separated by the formation of a new lake, gene flow between them would be restricted, increasing the likelihood of speciation due to geographic isolation. Conversely, organisms with greater dispersal capabilities, such as flying insects residing in separate valleys, may continue to interbreed due to ongoing gene flow.

Another example is when seeds are carried across the ocean to a new island. This geographic isolation is the foundation of allopatric speciation, which depends significantly on the biology and dispersal abilities of the organism. Variations in erosion resistance can also create unique formations, like the hoodoos in Bryce Canyon, which might further separate populations.

Answer: The amount of carbon dioxide for a given amount are 0.28 moles.

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We are given:

Given mass of carbon dioxide = 12.3 g

Molar mass of carbon dioxide = 44 g/mol

Putting values in above equation, we get:

[tex]\text{Moles of carbon dioxide}=\frac{12.3g}{44g/mol}=0.28mol[/tex]

Hence, the amount of carbon dioxide for a given amount are 0.28 moles.

The answer is: four.

For example compound carbon dioxide (CO₂):

Electron configuration of carbon: ₆C 1s² 2s² 2p².  

Electron configuration of oxygen: ₈O 1s² 2s² 2p⁴.

Carbon atom is sp2 hybridized, it has three sp2 orbitals and one p orbital, they form four bonds.

Oxygen has two p orbitals, they form two bonds (one sigma and one pi bond).

p orbitals from carbon and oxygen overlap and form pi bond.

Answer:

a

Explanation:

Final answer:

The weak attraction between diatomic molecules of halogens is due to London dispersion forces, which are the result of shifting electron densities within molecules inducing temporary dipoles in neighboring molecules. The correct option is D.

Explanation:

The weak attraction between diatomic molecules of the halogens (group 7A) is mostly due to London dispersion forces. These are van der Waals forces resulting from the constant motion and shifting electron density within any molecule, which can induce a temporary dipole in a neighboring molecule, hence creating a transient dipole-dipole interaction. They are the weakest of the intermolecular forces and are present in nonpolar molecules. Halogens, being nonpolar as diatomic molecules, interact primarily through these forces. In contrast, hydrogen bonding involves a hydrogen atom bonded to a highly electronegative atom like nitrogen, oxygen, or fluorine, and is much stronger than London dispersion forces. Dipole interactions occur in polar molecules where there is a permanent separation of charge. Meanwhile, ionic bonding occurs in compounds consisting of metals and nonmetals and involves the transfer of electrons, leading to the formation of oppositely charged ions, which is significantly stronger than dispersion forces.

Answer: Option (B) is the correct answer.

Explanation:

A covalent compound is defined as the compound in which there will be sharing of electrons between the combining atoms.

An ionic compound is defined as the compound in which there will be transfer of electrons from one atom to another.

A non-polar covalent compound is defined as the compound in which there will be equal sharing of electrons between the combining atoms.

A polar covalent bond is defined as the bond in which there will be unequal sharing of electrons between the combining atoms.

For example, in a NO molecule the oxygen atom is more electronegative than nitrogen atom. Hence, partial charges will tend to develop on both nitrogen and oxygen.

Also, there will be unequal sharing of electrons.

Thus, we can conclude that NO molecule is a polar covalent compound.

Answer : The correct option is, [tex]1\times 10^{-7}[/tex]

Explanation :

As we know that the ionic product of water is the product of the concentration of hydrogen ion and the concentration of the hydroxide ion.

In the pure water, the concentration of hydrogen ion and the concentration of the hydroxide ion are equal.

Mathematically,

[tex][H^+][OH^-]=1\times 10^{-14}mole/L[/tex]

When [tex][H^+]=[OH^-][/tex]

[tex][H^+]^2=1\times 10^{-14}mole/L[/tex]

[tex][H^+]=1\times 10^{-7}mole/L[/tex]

Therefore, the number of moles of [tex][H^+][/tex] ions in a liter of distilled pure water is, [tex]1\times 10^{-7}[/tex]

The atomic number of the element is 12. The name of the element is magnesium. It has two valence electrons. The element it most resemble is Be, beryllium.

looking at the periodic table given in the question, we can see that the element we are looking for belong to group 2, thus, its properties will be similar to that of Be, which belong to the same group. The electronic configuration of magnesium is 2, 8, 2, this implies that, it has two electrons on its outermost shell.

Answer:

D: HYPOTHESIS is a possible explanation for a problem using what you know and what you observe.

7.50 g of a compound that contains hydrogen, carbon and oxygen, which produces 11.0 g of carbon dioxide and 4.5 g of water when burned, contains 0.25 moles of carbon in the original sample.

That is;

CxHyOn + O2  = CO2 + H2O  

Moles of carbon in the original sample of a Hydrocarbon  

In our case:

Mass of CO2 formed is 11.0 g  

Mass of the hydrocarbon is 7.5 g  

Mass of carbon:  

1 mole of CO2 contains 12.0 g of carbon

44.0 g/mol contains 12.0 g of carbon

Hence; 11.0 g of CO2 will contain;

= (11x 12)/44.0g

= 3 g of carbon  

This means; the original mass of Carbon in 7.5 g of the hydrocarbon is 3 g  

Number of moles = mass/R.A.M

                             = 3 g/ 12.0 g/mol

                             = 0.25 moles  

Hence; 7.5 g of the hydrocarbon contained 0.25 moles of carbon.

Level: High school  

Subject: Chemistry  

Topic: Empirical formula and molecular formula  

To determine the number of moles of carbon in the original sample, we need to use the balanced equation for the combustion reaction. The original sample contained 11.0 moles of carbon.

To determine the number of moles of carbon in the original sample, we need to use the balanced equation for the combustion reaction. From the reaction, we can see that 1 mole of CO2 is produced for every 1 mole of carbon in the compound. So, if 11.0 g of CO2 is produced, it means that there are also 11.0 moles of carbon in the compound. Therefore, the original sample contained 11.0 moles of carbon.

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Statement  which is true about saturated fatty acid chains is that they contain only single covalent bonds.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Explanation:

Molecular formula of acetone is [tex]CH_{3}COCH_{3}[/tex] and its mass is 58.08 g/mol. Molecular formula of sodium chloride is NaCl and its mass is 58.44 g/mol.

Acetone contains ketone as the functional group and it is acidic in nature. Whereas NaCl is also known as common salt and it is not acidic in nature.

As both acetone and sodium chloride contains different type of atoms. Hence, despite of having similar mass they tend to show different properties.

The trend in atomic radius as you go down a group on the periodic table is an increase. This is because each successive element adds a new electron shell, meaning the outer electrons are further from the nucleus, and more shielded from the nuclear charge by inner shell electrons.

In the Periodic Table, the atomic radius trend seen as you move down a group (a vertical column) is that the atomic radius increases. This trend is due to the increase in the principal quantum number (n level) causing an increase in the size of the electron cloud around the nucleus, making the atomic radius larger. For example, within the group of alkali metals (Group 1), lithium (Li) at the top has a smaller atomic radius than sodium (Na) below it, which is smaller than potassium (K) beneath it, and so forth.

One reason the atomic radius increases as one goes down a group is that with each successive element, a new electron shell is being added. This means that the outer electrons are located further from the nucleus and more shielded from the nuclear charge by inner shell electrons. The effective nuclear charge experienced by the outermost electrons is therefore less, which means the electrons can reside further from the nucleus, leading to an increase in atomic radius for elements down a group.

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