How can we prevent communicable diseases Wikipedia?.

Answer:

\({ \tt{1 \: km = 1000m}} \\ { \tt{1.5 \times {10}^{8} km = (\frac{1.5 \times {10}^{8} \times 1000 }{1} )m}} \\ = 1.5 \times {10}^{11} \: metres\)

The concentration of the weak base that would produce a pH of 10.14 is 1.5 * 10^15 M.

Let us recall that the Kb is simply the base dissociation constant. This is the equilibrium constant that would  tell us how much of the base has been dissociated in the solution.

In this case, we can be able to write the equation of the dissociation of the base in the following way;

\(BH^+\)(aq) + \(H_{2} O\)(l) -------> \(B^-\)(aq) + \(H_{3} O^+\)(aq)

Kb = [ \(B^-\)] [ \(H_{3} O^+\)]/[\(BH^+\)]

But [ \(B^-\)] = [ \(H_{3} O^+\)] = Antilog (-10.14)

= 7.2 * 10^-11 M

Thus;

7.80 × 10^−7 = (7.2 * 10^-11)^2/[\(BH^+\)]

[\(BH^+\)] = 7.80 × 10^−7/(7.2 * 10^-11)^2

[\(BH^+\)] =   7.80 × 10^−7/5.2 * 10^-22

[\(BH^+\)] =  1.5 * 10^15 M

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Answer:

Molecular formula = C₆H₄Cl₂

Explanation:

Given data:

Percentage of hydrogen = 2.7%

Percentage of carbon = 49%

Percentage of chlorine = 48.2%

Molar mass of compound = 150 g/mol

Molecular formula = ?

Solution:

Number of gram atoms of H = 2.7 / 1.01 = 2.67

Number of gram atoms of Cl = 48.2 / 16 = 1.36

Number of gram atoms of C = 49 / 12 = 4.08

Atomic ratio:

            C                      :           H             :           Cl

           4.08/ 1.36         :     2.67/1.36       :       1.36/1.36

            3                      :        2                 :        1

C : H : Cl = 3 : 2 : 1

Empirical formula is C₃H₂Cl.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = 12×3 + 1.01 ×2 + 35.5 = 73.52 g/mol

n = 150 / 73.52

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₃H₂Cl)

Molecular formula = C₆H₄Cl₂

Answer:

A metallic bonding holds the particles of the substance together

Explanation:

The unknown substance is a metal:

A 28.3 ml sample of a dilute dextrose IV solution has a mass of 36.7 g. The density of the dilute dextrose IV solution is 1.30 g/ml.

To calculate the density of the solution, we need to divide the mass of the sample by its volume. We know that the volume of the sample is 28.3 ml, and its mass is 36.7 g. Therefore, the density of the solution is calculated as follows:
Density = Mass / Volume
Density = 36.7 g / 28.3 ml
Density = 1.30 g/ml
So, the density of the dilute dextrose IV solution is 1.30 g/ml. This means that the solution is relatively light and less dense than water, which has a density of 1 g/ml. The density of a solution can provide valuable information about its composition and concentration, and it is an essential parameter in many chemical and medical applications.

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Answer:  Mg(s) +  H2SO4(aq)  + H2(g)

Explanation:

Magnesium sulfate:

Magnesium sulfate is a chemical compound, a salt with the formula .

Magnesium reacts with dilute Sulphur acid to form Magnesium sulfate and Hydrogen gas.

  Mg(s) +  H2SO4(aq)  + H2(g)

This reaction is a single displacement reaction and also exothermic.

Therefore, the balanced chemical equation for the reaction of magnesium solid with sulfuric acid to form hydrogen gas and magnesium sulfate is  

  Mg(s) +  H2SO4(aq)  + H2(g)

.

Answer:

A line spectrum is produced when the electron moves from one energy level to a lower energy level.

Answer:

Explanation:

...from one energy level to a lower energy level

Answer:

See below

Explanation:

The common formula of the same alkene series is CnH2n, where n is the quantity of atoms of carbon. Owing to the hydrocarbons of alkenes with at least one double carbon relation, the alkene-like sequence starts with ethen C2H4.

Hope this helps.

The general formula for the homologous series which includes ethene is alkenes.

Alkenes

They are homologous series with the general formula CxH2x.

Where:

x = number of carbon atoms.

Examples are methene with one carbon atom: CH2

Ethene with 2 carbon atoms: C2H4

Propene with 3 carbon atoms: C3H6

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Answer: Its B/Climate

Im pretty sure if its wrong srry!

Hope this helped!

Explanation:

Apart from different ways to classify soils. The one factor that scientists use to classify orders of soil is climate. Hence, Option (B) is correct

Climate is the long-term pattern of weather in a particular area.

Weather can change from hour-to-hour, day-to-day, month-to-month or even year-to-year.

A region's weather patterns, usually tracked for at least 30 years, are considered its climate.

Other factors people uses in classifying orders of soil are;

Soil orders are known as the single dominant attributes affecting soils in any location.

They can be the prevalent vegetation such as Alfisols and Mollisols or the type of parent material such as Andisols and Vertisols or the climate variables such as lack of precipitation etc.

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The likely magnitude of the equilibrium constant K is greater than 10^3, and answer (b) is the most appropriate choice.The equilibrium constant K for the combustion reaction 2H2(g) + O2(g) = 2H2O(g) is likely to be very large, indicating a strong preference for the products at equilibrium.

This is because the reaction involves the formation of strong covalent bonds between the hydrogen and oxygen atoms, releasing a large amount of energy in the form of heat and light. The combustion reaction also involves the conversion of two moles of hydrogen gas and one mole of oxygen gas into two moles of water vapor, which means that the number of moles of gas decreases, leading to a decrease in entropy. Despite this decrease in entropy, the exothermic nature of the reaction is likely to drive the equilibrium towards the products. Therefore, the likely magnitude of the equilibrium constant K is greater than 10^3, and answer (b) is the most appropriate choice.

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Compound 1 is a chemical substance with a melting point of 545 degrees Celsius, and it dissolves well in water.

A compound is a pure substance composed of two or more elements that are chemically bonded in definite proportions. The solubility of a compound in a given solvent depends on various factors such as the nature of the solvent, the polarity of the compound, the temperature, and the pressure. For instance, if a compound is polar, it is likely to dissolve in polar solvents such as water.

In contrast, if a compound is non-polar, it is likely to dissolve in non-polar solvents such as hexane or benzene. At 545 degrees Celsius, Compound 1 is likely to exist as a solid. The melting point is a physical property of a solid that indicates the temperature at which it changes from a solid to a liquid state. In summary, Compound 1 is a solid compound with a melting point of 545 degrees Celsius and dissolves well in water.

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Being burned out means feeling empty and mentally exhausted, devoid of motivation.

What is burnout?

The ways to cope with personal stress:

Four methods that helped many supervisors cope with stress are

(1) engaging in physical exercise

(2) practicing relaxation techniques

(3) gaining a sense of control

(4) developing and maintaining good interpersonal relationships.

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Oxygen is a nonmetal and it has 6 valence electrons. (2s subshell has two and 2p subshell has four)

The element's size shrinks as it moves from left to right in a period, while its electronegativity rises. Therefore, we can conclude that an element's non-metallic property grows as an element moves from left to right over time.Elements get bigger and have lower electronegativities as they move down the group. As a result, their ionization energy drops and they become more metallic.Therefore, if we look at oxygen, it is situated in the sixteenth group, which is to the right of the periodic table, and the second period, which is smaller in size than other elements.

As a result, we can infer that the oxygen atom will have a significant non-metallic character because of its tiny size and strong electronegativity.

The electrons in an atom's outermost shell are called valence electrons. Because the electrons in the outermost shells of two atoms are the first to come into contact with one another and are the ones that control how an atom will react in a chemical reaction, when two atoms interact.

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Answer:

Oxygen is a non metal, and has 6 valence electrons.

Explanation:

I did it on plato

If we take a  look at the composition and structure, both xylem and phloem are vascular tissues made up of cellulose and parenchymatous cells.

The Xylem is made up of of dead cells whereby parenchyma is  the only living part but Phloem is solely made up  of living cells that has no  nuclei.

Xylem is also made up of xylem vessels, tracheid's and xylem fibers.

Phloem on its own has four different elements which include:

sieve tubes, companion cells, phloem fibres, bast fibres, intermediary cells along with the phloem parenchyma.

In conclusion, the Xylem and Phloem are both tubular vascular tissues that plants use to transport water and food respectively.

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This exercise is similar to the previous one and we can solve it by following the same steps. We have the number of molecules in the reagents:

2 Al

6HCl

The atoms of the molecules do not have subindexes*, therefore the total value will be equivalent to the coefficient multiplied by 1:

Al: 2 x 1 =2

H: 6 x 1 = 6

Cl: 6 x 1 = 6

So, must be present 6 atoms of hydrogen in the products

* Subindexes: "A letter or number placed to the right and at the bottom of a mathematical, chemical, etc. symbol to distinguish it from other similar symbols". For example:

In this case, the subindex will be number two. It means that there are 2 hydrogens in the molecule.

From the formula unit potassium carbonate, there are two potassium ions and one carbonate ion.

The term formula unit refers to the smallest unit of an ionic compound. Indicates the ratio of ions in a compound. For potassium carbonate, the unit of the formula is K₂CO₃.

In recent years, potassium carbonate (K₂CO₃.) has been extensively employed as a mild base catalyst in several chemical processes, including Knoevenagel and Nitroaldol Condensation O-alkylation the production of 2H-chromenes , and monomethylation reactions

there fore, From this formula unit we can see that there are two potassium ions and one carbonate ion.

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Answer:

C. a blue solid dissolving in a water and changing the water to a blue colour

Explanation:

Answer:

23

Explanation:

we do not care about electrons, so 11 + 12 = 23

The formula of De Broglie is the following:

Remember that the mass of an electron is 9.11 x 10 ^(-31) kg, so replacing in the formula, we're going to obtain:

The answer is that the wavelength of an electron traveling at 1.48 x 10^(5) m/s is 4.91 x 10^(-9) m.

The gas that would deviate the least from ideal gas behavior is Ne (neon).

Examining the circumstances that cause gas to depart from optimal behavior, such as high pressure and low temperature, can reveal this. Due to its moderate intermolecular interactions and low polarizability as a noble gas with relatively low atomic weight, neon is less likely to depart from ideal gas behavior in these circumstances.

However, because of their stronger intermolecular interactions and higher polarizability, N (nitrogen), CO2, F2, and Kr (krypton) are all more prone to stray from the behavior of an ideal gas at high pressures and low temperatures.

The compressibility factor, Z, is a mathematical concept that can be used to describe the magnitude of departure from ideal behavior. For an ideal gas, Z should be near 1 at low pressures and high temperatures, but Z deviates from 1 as pressure and temperature decrease. Neon acts more optimally than the other gases listed since it has a low Z value in a variety of situations.

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The complete question is -

Which gas among Ne (neon), N (nitrogen), CO2 (carbon dioxide), F2 (fluorine), and Kr (krypton) would deviate the least from ideal gas behavior, and why?

Answer:

yes its called as poop

Explanation:

Answer:

Sodium carbonate, Na2CO3, (also known as washing soda, soda ash and soda crystals) is the inorganic compound with the formula Na2CO3 and its various hydrates. All forms are white, water-soluble salts that yield moderately alkaline solutions in water.

Explanation:

hope this helps u... :D

Answer:

don't know

Explanation:

Thanks❤ have a nice day

Answer:

Liquid

Explanation:

Octane is a straight chain alkane composed of 8 carbon atoms. It has a role as a xenobiotic. N-octane is a colorless liquid with an odor of gasoline.

The balanced equation for a beta particle of Ni64 is:

⁶⁴Ni -> ⁶⁴Cu + e⁻

Ni64 (nickel-64) undergoes a beta decay, where a neutron converts into a proton, releasing a beta particle (an electron) in the process. This results in the formation of Cu64 (copper-64).

In the balanced equation, it is shown that one atom of Ni64 decays into one atom of Cu64, along with the emission of a beta particle (e⁻). The arrow points in the direction of the decay.

It is important to note that this equation represents a single beta particle of Ni64. In a broader context, multiple beta decays can occur for Ni64 as it is a radioactive isotope. However, for a single beta particle, the balanced equation shown is valid.

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Answer:

There are three types of periods in the modern periodic table: very short periods, short periods, and long periods.

The difference between very short periods and short periods is the number of elements they contain. Very short periods only contain two elements, while short periods contain eight elements. The difference between short periods and long periods is the number of orbitals that can be occupied by electrons in each period. Short periods can only have electrons in the s- and p-orbitals, while long periods can also have electrons in the d-orbital.

Here is a table summarizing the differences between very short periods, short periods, and long periods:

Answer:

Venus

Explanation:

From the sun outwards is   Mercury   Venus  Earth  and then Mars

The correct option is E. The compound that is not a product of the reaction between 1,3-butadiene and HBr is (Z)-2-bromo-2-butene.

A chemical reaction is a process in which one or more substances (reactants) are transformed into new substances (products) by breaking and forming chemical bonds. Chemical reactions are essential in many natural and synthetic processes, including the formation of the molecules that make up living organisms and the production of materials such as medicines, fuels, and plastics.

Chemical reactions involve the rearrangement of atoms, ions, or molecules, resulting in the formation of new substances with different properties from those of the reactants. The reactants and products of a chemical reaction can be represented by a chemical equation, which shows the identities and quantities of the reactants and products.

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The sigma bond is formed by the head-on overlap of the two orbitals.

H-N-H bond angle is approximately 109.5 degrees in this case.

In the ammonium ion (NH₄⁺), the sigma bond between nitrogen (N) and hydrogen (H) is formed by overlapping the sp³ hybrid orbital on nitrogen with the 1s orbital on hydrogen.

The nitrogen atom in NH₄⁺ undergoes sp³ hybridization, meaning that it mixes one 2s orbital and three 2p orbitals to form four sp³ hybrid orbitals. One of these hybrid orbitals forms a sigma bond with each of the four hydrogen atoms.

The hydrogen atom has a 1s orbital, which overlaps with one of the sp³ hybrid orbitals on nitrogen to form a sigma bond. This sigma bond is formed by the head-on overlap of the two orbitals.

Regarding the approximate H-N-H bond angle in NH₄⁺, it is approximately tetrahedral, which means it is close to 109.5 degrees.

The four hydrogen atoms surround the central nitrogen atom, creating a tetrahedral arrangement. Each H-N-H bond angle is approximately 109.5 degrees in this case.

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The volume of CO₂ generated under condition of STP in the reaction :

CaCO₃   +  2HCl   ----->   CaCl₂   +   H₂O   +   CO₂ is  12.5 mL.

The reaction is given as :

CaCO₃   +  2HCl   ----->   CaCl₂   +   H₂O   +   CO₂
mass of CaCO₃  = 750 mg = 0.75 g

molarity of HCl = 0.100 M

volume of HCl = 25 mL = 0.025 L

moles of CaCO₃  = 0.75 / 100

                            = 0.0075 mol

moles of HCl = 0.100 × 0.025

                       = 0.0025 mol

here HCl is limiting reagent , formation of CO₂ depends on HCl

2 moles of HCl = 1 mole of CO₂

0.0025 mol of HCl = 0.0025 / 2

                               = 0.00125 mol

volume of CO₂ = moles / molarity

                          = 0.00125 / 0.100

                         = 0.0125 L = 12.5 mL

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