how many significant gigures are in each mesasurments 303,000mm

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]

Answer:

The answer is: TRUE

Explanation:

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This is true, since the Lithium atom has a valence number of +1, this means an electron to yield.

For its part, the iodine has valence number -1, this means a place to accept electrons.

When joined they make a perfect combination where it has high electronic stability.

We conclude that the answer is: TRUE

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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The process of balancing a redox reaction in acidic conditions involves identifying oxidation states, separating into half-reactions, balancing for mass and charge, and combining. The provided question contains errors, making it impossible to balance as stated.

The question you've asked involves balancing a redox reaction in acidic conditions, which is a foundational concept in chemistry. Unfortunately, the equation provided (Cr2+ + H2MoO4 --> Cr3+ Mo) is not completely accurate or clear in terms of the reactants and products involved. Typically, in a redox reaction balancing task, you would identify the oxidation states of the elements involved, separate the reaction into oxidation and reduction half-reactions, balance each for mass and charge, and then combine them back into a full balanced equation. However, it looks like there was some confusion or typo in the equation provided, as H2MoO4 and Mo don't directly relate to the chromium oxidation states changing from Cr2+ to Cr3+.

In general, to balance redox reactions in acidic conditions, you first write the separate half-reactions for oxidation and reduction, balance the atoms in each half-reaction (first the non-oxygen and non-hydrogen atoms, then oxygen by adding H2O, and hydrogen by adding H+ ions), balance the charges by adding electrons, and then combine the half-reactions ensuring that the electrons are balanced. Finally, you would simplify the equation if possible. Without the correct equation, giving a specific balanced reaction is not feasible.

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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Explanation:

The highest occupied energy sub-level is defined as number of electrons present in the outermost energy level of an atom.

For example, for alkali metals general electronic configuration is [tex]ns^{1}[/tex].

This means that in the highest occupied energy sub-level of an alkali metal there will be only one electron.

Whereas for alkaline earth metals general electronic configuration is [tex]ns^{2}[/tex]. This means there are 2 electrons present in the highest occupied energy sub-level of an alkaline earth metal.

Thus, we can conclude that atom that contains only one electron in the highest occupied energy sublevel are alkali metals.

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.

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 preference for Cola or Pepsi is subjective, influenced by personal taste but can be skewed by research methods like in the Pepsi Challenge. Situations like the Soft Drink Commissioner election show how a divided majority could lead to unexpected results. A merger between Coke and Pepsi could be viewed as anti-competitive.

The preference between Cola and Pepsi comes down to personal taste and is subjective. However, in a scenario like the Pepsi Challenge, the preference shown for Pepsi could have been influenced by a confounding variable, such as the knowledge of what each letter represents to the subjects. To redesign the research and eliminate the confound, one would need to ensure that the participants are entirely unaware of which beverage is in each glass, otherwise known as a double-blind test. Additionally, situations like the Soft Drink Commissioner election illustrate how multiple candidates from one party can split the voting population, leading to a win for the single opposing candidate due to a divided majority.

In terms of deciding which is better, Coke or Pepsi, that is not an objective question and varies based on individual preference. However, in a legal context involving a potential merger of the two companies, a judge might consider the effect on competition in the marketplace. If a merger between Coke and Pepsi was proposed, one might argue against it on the grounds of it being anti-competitive, despite any suggested efficiencies.

The molecular weight of Mn2Se7 = 662.1grams /mol

The molecular weight of molecule is calculated using the periodic table to find out the atomic weight of each atom times the number of atoms present.

Therefore, atomic weight of Mn= 54.9 × 2 = 109.8g

Se = 78.9 × 7 = 552.3g

109.8g + 552.3g = 662.1g/ mol

Therefore the molecular weight = 662.1grams /mol

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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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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.

b hope it helps i got it right so you should to thanks for asking

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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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.

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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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.

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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Answer: Option (B) is the correct answer.

Explanation:

Entropy is defined as the degree of disorder or randomness. This means that when particles of a matter move rapidly and continuously from one place to another then this shows entropy of the matter is high.

For example, particles of a gas are weakly held and hence, they rapidly collide and show high entropy.

Whereas in solids, particles are held together by strong intermolecular forces of attraction. Thus, they are not moving and hence in solids entropy is the lowest.

Thus, we can conclude that out of the given options, [tex]H_{2}O(s)[/tex] has the lowest entropy.

The correct answer is H2O(s) - Ice. Entropy is a measure of disorder in a system. The lowest entropy is found in solids because their particles are closely packed and have a fixed arrangement.

The correct answer is B: H2O(s) - Ice

Entropy is a measure of the disorder or randomness of a system. The state of matter with the lowest entropy is a solid because the particles are closely packed and have a fixed arrangement.

For example, in the case of water, H2O(s) or ice has the lowest entropy because the water molecules are arranged in a regular lattice structure. In comparison, H2O(g) or water vapor has a higher entropy because the water molecules are spread apart and have greater freedom of movement.

Hence, among the given options, H2O(s) has the lowest entropy.

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Answer:

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

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.

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.