What is the density of 10. 002 g of water at 20°c in the units of g/ml?.

longitudinal wave.... is the right answer

Answer:

c. c. c c c c c cçcc. ccccccccc

Explanation:

ccc cc

When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. So option A is correct option.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure.  Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of  intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. Hence option A is correct.

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Answer: Be hard to move it.

Explanation: If you have 1 book, and you put 5 more books on top, then the 6 books will be heavy to move.

Answer:

OD. Ka = 1.62 × 10-12

Explanation:

An acid is weak the smaller the Ka value, so the weakest acid in this case is the one with a Ka=1.62 × 10-12.

Answer:

True

Explanation:

Elemental gold is a pure substance (if it is 24 carat). Gold used in jewelry is a mixture with such other metals as copper and nickel. Pure gold is rather soft, so it is mixed (alloyed) with other metals.

False.

Gold (Au) is a pure element (or element) with atomic number 79.

Answer:

Refer to your periodic table. Lewis dot structures are based off the number of valence electrons an atom has.

Looking at the compounds, we can see that Gallium has three valence electrons in its outer shell and oxygen has six. Oxygen and Gallium are going to share electrons with one another, making a V shape in their diagram.

One Oxygen would make a double bond with a Gallium, leaving one valence electron to another oxygen. That oxygen takes that Final electron. It now has 7 in its outer shell. The remaining Gallium and Oxygen do the same double bond as the one before, leaving the 7 valence electron oxygen with one more electron.

The Lewis dot structure of Ga₂O₃ is shown below.

In molecular structure, Lewis structures describe the relationship between molecules' atoms and their lone pairs of electrons. Lewis structures are also used to predict molecular geometry in conjunctions with hybrid orbitals.

Ga₂O₃ is the inorganic compound of gallium (III) oxide. It is a semiconductor with a very wide bandgap. It is widely used in power electronics. It is also used in phosphors and gas sensing.

There are several polymorphs of gallium oxide. The most stable polymorph of gallium oxide is the polymorph of gallium(III)(monoclinic).

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The image for the Lewis dot structure is shown below.

Answer:

3.1atm

Explanation:

Given parameters:

Volume of gas = 2L

Number of moles  = 0.25mol

Temperature  = 25°C = 25 + 273  = 298K

Unknown:

Pressure of the gas = ?

Solution:

To solve this problem, we use the ideal gas equation.

This is given as;

       PV  = nRT

P is the pressure

V is the volume

n is the number of moles

R is the gas  constant  = 0.082atmdm³mol⁻¹K⁻¹

T is the temperature

          P  = \(\frac{nRT}{V}\)  

 Now insert the parameters and solve;

         P  = \(\frac{0.25 x 0.082 x 298}{2}\)   = 3.1atm

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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A carbonyl group polar because b. oxygen is significantly more electronegative than carbon.

The carbonyl group is a functional group in organic chemistry consisting of a carbon atom double-bonded to an oxygen atom. C=O is the formula for a carbonyl group, this structure is present in many ketones and aldehydes, as well as carboxylic acids, esters, and amides. Oxygen is much more electronegative than carbon, and as a result, the electrons in the carbon-oxygen double bond are more strongly attracted to the oxygen atom. Because the electrons are attracted to the oxygen atom, the carbon-oxygen bond becomes polarized, with oxygen becoming negatively charged and carbon becoming positively charged.

The carbonyl group is an important functional group in biochemistry since it is found in a variety of biomolecules like carbohydrates, lipids, and nucleic acids. Because of its polarity, it can engage in hydrogen bonding with other functional groups in these molecules, such as hydroxyl groups. A carbonyl group polar because b. oxygen is significantly more electronegative than carbon.

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The element that fluorine forms an ionic bond with is sodium (Na). The answer is B)

Fluorine (F) is a highly electronegative element and has a tendency to gain one electron to complete its octet and attain a stable noble gas configuration. Sodium (Na), on the other hand, is a highly electropositive element and has a tendency to lose one electron to attain a stable noble gas configuration.

When fluorine and sodium react, fluorine gains one electron from sodium, and both atoms attain a stable noble gas configuration. This results in the formation of an ionic bond between them, with sodium losing one electron to become a positively charged ion (Na⁺) and fluorine gaining one electron to become a negatively charged ion (F⁻).

The resulting compound is sodium fluoride (NaF), which is an ionic solid with high melting and boiling points and is soluble in water.

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The balanced chemical equation for the reaction of hydrobromic acid (HBr) with a solution of calcium hydroxide (Ca(OH)2) can be represented as \(2HBr+Ca(OH)_{2} - > CaBr_{2}+2H_{2}O\)

In this reaction, hydrobromic acid, which is a strong acid, reacts with calcium hydroxide, which is a strong base, to form calcium bromide and water.

The reaction can be understood by considering the acid-base neutralization process. Hydrobromic acid donates a proton (H+) to the hydroxide ion (OH-) from calcium hydroxide. This results in the formation of water (H2O) and calcium bromide (CaBr2).

The balanced equation shows that 2 moles of hydrobromic acid react with 1 mole of calcium hydroxide, producing 1 mole of calcium bromide and 2 moles of water. The coefficients in the balanced equation indicate the stoichiometric ratio of the reactants and products.

Overall, the balanced equation accurately represents the reaction between hydrobromic acid and a solution of calcium hydroxide, highlighting the formation of calcium bromide and water as the products.

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The molar mass of the substance is approximately 186.92 g/mol.

To calculate the molar mass of a substance, we divide the mass of the substance by the number of moles. In this case, we are given the mass of the substance as 21.9 g and the number of moles as 0.117 mol. By dividing these two values, we can determine the molar mass.

Molar mass = Mass of the substance / Number of moles

Given:

Mass of the substance = 21.9 g

Number of moles = 0.117 mol

Substituting the values into the equation:

Molar mass = 21.9 g / 0.117 mol

Solving the equation:

Molar mass ≈ 186.92 g/mol

The molar mass of the substance is approximately 186.92 g/mol. This means that for every 1 mole of the substance, it has a mass of 186.92 grams. The molar mass is an important property used in chemistry to determine the amount of substance in a given mass or vice versa.

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Answer:

Mass is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g). To measure mass, you would use a balance.

Answer:

8 minutes.

Explanation:

How long does it take light to go from the sun to the Earth?

Light travels from the Sun to the Earth in about 8 minutes and 19 seconds. While it only takes 8 minutes and 19 seconds for the light from the surface of the sun to reach us, it actually takes about 10,000-170,000 years for a photon to travel from the core of the sun to the surface.

By using the ideal gas law to get volume we have"

Where v is volume, T is temperatute, n is number of moles, R is the molar gas constant and P is pressure. At STP P= 101,325 Pa, T= 273.15 K and R= 8.314 J/mol K

We must first convert mass to moles:

By substituting this value into the ideal gas law we have:

1.9502e-6L of H2 gas reacted at STP

Answer:

Its C let me know if its wrong!

Answer:

.2 M

Explanation:

grams/molar mass=ans./volume(L)=molarity

5.6/56=ans./.500=.2 M

- Hope that helps! Please let me know if you need further explanation.

Density =mass/volume

=6/3

=2

Answer:

A theory

Explanation:

A girl roller-skating has kinetic energy.

Kinetic energy is the energy of motion. It is the energy possessed by an object due to its movement. In this case, the girl roller-skating has kinetic energy because she is moving.

Potential energy is the energy an object possesses due to its position or configuration. It is the energy an object has stored within it, ready to be released. An object at rest has potential energy because it has the potential to be set in motion and does work.

So, in this case, the girl roller-skating has kinetic energy because she is moving, and not potential energy because she is not at rest.

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Overlapping, in the context of analytical chemistry, refers to the situation where the absorption bands of two or more compounds in a sample overlap in a way that makes it difficult to accurately measure or estimate their individual concentrations. The specific approach used to correct for overlapping depends on the nature of the compounds, the instrumentation available, and the analytical requirements of the study.

Overlapping can lead to distorted readings and affect the accuracy of analysis. To correct for overlapping, various methods can be employed, such as selective wavelength measurements, derivative spectroscopy, multivariate analysis, and pre-treatment techniques.

Selecting an appropriate wavelength or using derivative spectroscopy enhances resolution and allows for better differentiation of compounds. Multivariate analysis utilizes mathematical algorithms to predict individual concentrations.

Pre-treatment methods, like sample dilution or separation, can reduce overlapping effects. The choice of correction method depends on the compounds, available instrumentation, and specific analytical requirements.

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Answer:

The percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution is 4.61 %

Explanation:

The mass percentage of a solution is a measure of concentration that indicates the number of grams of solute that there are per 100 grams of solution.

The percent by mass is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100 to give a percentage.

\(percentage by mass=\frac{solute mass}{solution mass} *100\)

In this case:

Replacing in the definition of percent by mass:

\(percentage by mass=\frac{30 g}{650 g} *100\)

Solving:

percent by mass= 4.61 %

The percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution is 4.61 %

Through selling using easy cookstoves in developing global places, a worldwide alliance hopes to reduce Deforestation.

Deforestation is the beneficial clearing of forested land. inside the direction of information and into times, forests were razed to make area for agriculture and animal grazing, and to achieve wooden for gas, production, and creation. Deforestation has extensively altered landscapes across the arena.

Deforestation can be defined due to the reality the large-scale removal of timber from forests for the facilitation of human sports activities. it's miles a intense environmental challenge due to the fact it is able to bring about the dearth of biodiversity, damage to herbal habitats, disturbances in the water cycle, and soil erosion.

The ecosystems that forests create play a key role in Earth's survival, so deforestation within reason risky.

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The following is a plausible scenario for the work of CoQ in the electron transport chain: CoQ is reduced by Complex I & later oxidizes Complex III (Option B).

CoQ, which stands for coenzyme Q, plays a vital role in the electron transport chain (ETC). The CoQ receives electrons from Complex I in the form of NADH and becomes reduced. Reduced CoQ then moves to Complex III, where it donates these electrons, resulting in the formation of ubiquinol and the transfer of protons across the inner mitochondrial membrane. After this transfer, CoQ oxidizes Complex III and receives electrons to form a semi-reduced CoQ, which subsequently moves to Complex IV.

Your question is incomplete, but most probably your options were

A: CoQ is reduced by Complex I & later oxidizes Complex III

B: CoQ oxidizes Complex I & then is later oxidized by Complex III

C: CoQ reduces Complex I and later reduces Complex III

D: CoQ is oxidized by Complex I and is later oxidized by Complex III

Thus, the correct option is B.

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The velocity of the baseball to have a de Broglie wavelength that is equal to an x-ray photon with λ = 91.0 pm is 3.84 x 10^5 m/s.

According to De Broglie's theory, every matter exhibits both wave-like and particle-like behavior. This behavior can be determined by using de Broglie wavelength. The de Broglie wavelength of the baseball can be calculated using the formulaλ = h/mv, where λ is the de Broglie wavelength, h is Planck's constant, m is the mass of the particle, and v is the velocity.

Using the above formula, the de Broglie wavelength of the x-ray photon is λ = 91.0 x 10^-12 m. Substituting the values in the formula, we get v = h/(m x λ). On substituting the values, we get: v = 6.626 x 10^-34 J s / (141.5 x 10^-3 kg x 91.0 x 10^-12 m). The velocity of the baseball to have a de Broglie wavelength that is equal to an x-ray photon with λ = 91.0 pm is 3.84 x 10^5 m/s.

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Answer:

\(\boxed {\boxed {\sf 1.93 \ mol \ CO_2}}\)

Explanation:

We are asked to find how many moles of carbon dioxide are in 85.0 grams.

Grams are converted to moles using the molar mass (the mass of 1 mole of a substance). These values are found on the Periodic Table. They are equal to the atomic mass, but the units are grams per mole instead of atomic mass units.

Look up the molar masses of carbon and oxygen.

The formula CO₂ has a subscript of 2. There are 2 moles of oxygen in 1 mole of carbon dioxide. Multiply oxygen's molar mass by 2.

Set up a conversion factor using the molar mass.

\(\frac {44.009 \ g \ CO_2}{ 1 \ mol \ CO_2}\)

We are converting 85.0 grams of carbon dioxide to moles, so we multiply by this value.

\(85.0 \ g \ CO_2 *\frac {44.009 \ g \ CO_2}{ 1 \ mol \ CO_2}\)

Flip the fraction so the units of grams of carbon dioxide cancel.

\(85.0 \ g \ CO_2 *\frac { 1 \ mol \ CO_2}{44.009 \ g \ CO_2}\)

\(85.0 *\frac { 1 \ mol \ CO_2}{44.009}\)

\(\frac {85.0}{44.009} \ mol \ CO_2\)

\(1.931423118 \ mol \ CO_2\)

The original measurement of grams (85.0) has 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 1 in the thousandth place tells us to leave the 3.

\(1.93 \ mol \ CO_2\)

There are approximately 1.93 moles of carbon dioxide in 85.0 grams.

The alkenes have only dispersion forces while the alcohol posses strong hydrogen bonds. This is why the alkenes have lower boiling points than the alcohols.

We know that the boiling point is the temperature at which the atmospheric pressure becomes equal to the pressure of the system. In this case, we know that the temperature at which this happens would depend on the magnitude of the intermolecular forces in the substance.

Given that the alcohol molecules are held together by the hydrogen bonds and strong dipole forces, we can see that it would have a higher boiling point we need more energy to break these forces.

The alkenes have only the dispersion forces as such they can easily be broken by the heating thus they have lower boiling points due to the facts that less heat is needed to break the intermolecular interaction between the molecules.

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Answer:

C. nonliving.

Explanation:

Reasoning 1: On a general base, you have more surface area exposed so more air molecules (if you're not having a meal in outer space) come in contact with the food, absorbing heat energy, cooling it down.

Ok, so this is only one reason if your food is dehydrated 'to the core'.

Reasoning 1 + 2: Most foodstuff contain moisture. This moisture evaporates on absorbing heat energy from surroundings. This causes a temperature decrease of the food surface.

Looking upon the basic factors that alter evaporation rate, more surface area exposure causes a faster evaporation rate, hence, faster cooling rate.