Which statement best describes heating by conduction?


1. Sunlight travels through space without the aid of fluids or solids.

2. Air at the equator rises and sinks at the poles.

3. Air molecules touch the warm ground, heating them up.

4. Warm air rises and takes heat with it; eventually it cools and sinks.

(If you want brainliest please explain why the answer is that answer)

Answer:

Denmark, Finland, New Zealand, Norway, Singapore, and Sweden are perceived as the least corrupt nations in the world, ranking consistently high among international financial transparency, while the most apparently corrupt are Somalia (scoring 12), Syria and South Sudan (both scoring 13).

Answer:

See below.

Explanation:

To determine the electron pair geometry of Carbonothioyl dibromide, we need to first draw its Lewis structure:

Br Br

\ /

C=S

/

Br Br

Carbonothioyl dibromide has four electron groups around the central sulfur atom: two single bonds with the two bromine atoms, one double bond with the carbon atom, and one lone pair of electrons on the sulfur atom.

Using VSEPR theory, we can predict the electron pair geometry by considering both the bonding and the lone pairs of electrons. In this case, the electron pair geometry of Carbonothioyl dibromide is tetrahedral because it has four electron groups around the central sulfur atom.

However, the molecular geometry of Carbonothioyl dibromide is trigonal pyramidal due to the presence of one lone pair of electrons on the sulfur atom.

Answer:

matter undergoes

chemical changes such as burning and rusting.

physical changes such as evaporating and melting.

matter has

chemical properties such as reacting with oxygen and changing when heated.

physical properties such as luster and volume.

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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Answer:

I think the awnser is B proteins

Explanation:

I could be wrong but this is off preveous knowleadge.

Answer: I think the answer is A or D I'm not sure

Explanation:

The products of the alpha decay of radium-226 and the beta decay of carbon-14 are radon-222 and nitrogen-14, respectively.

The alpha decay of radium-226 results in the emission of an alpha particle, which is a helium nucleus consisting of two protons and two neutrons.

Therefore, the product of the alpha decay of radium-226 is radon-222:

Ra-226 → Rn-222 + alpha particle

On the other hand, In the case of carbon-14, beta minus decay occurs, in which a neutron is converted into a proton, and an electron and an antineutrino are emitted.

So carbon-14 becomes nitrogen-14:

C-14 → N-14 + beta particle

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--The complete Question is, What is the product of the alpha decay of radium-226 and the beta decay of carbon-14?--

Answer:

a. LiF(s) ⇄ Li⁺(aq) + F⁻(aq)

b. [Li⁺] = [F⁻] = 6.2 x 10⁻² M

c. Ksp = [Li⁺] [F⁻]

d. Ksp = 3.8 × 10⁻³

Explanation:

The solubility (S) of lithium fluoride, LiF, is 1.6 g/L, or 6.2 x 10⁻² M.

a. The balanced solubility equilibrium equation for LiF is:

LiF(s) ⇄ Li⁺(aq) + F⁻(aq)

b. We will make an ICE chart.

        LiF(s) ⇄ Li⁺(aq) + F⁻(aq)

I                       0           0

C                     +S         +S

E                       S           S

Then, [Li⁺] = [F⁻] = S = 6.2 x 10⁻² M

c. The solubility product constant, Ksp​, is the equilibrium constant for a solid substance dissolving in an aqueous solution.

Ksp = [Li⁺] [F⁻]

d.

Ksp = [Li⁺] [F⁻] = (6.2 x 10⁻²)² = 3.8 × 10⁻³

Answer:

Unfortunately, the plot of vapor pressures vs temperature mentioned in the question is not provided. However, we can still use the given information to make some general observations.

The fact that the vapor pressure of diethyl ether is 400 mm Hg at 18.0 °C means that at this temperature, the pressure exerted by the vapor above the liquid is equal to 400 mm Hg. We can assume that the vapor pressure of carbon disulfide will also be 400 mm Hg at a specific temperature.

To estimate this temperature, we need to refer to the vapor pressure-temperature plot for carbon disulfide. Generally, the heat of vaporization of a substance is related to its vapor pressure-temperature behavior. However, without this plot, we cannot make a direct comparison between the heat of vaporization of diethyl ether and carbon disulfide.

Answer:

But its only 5 points, not 10

Explanation:

Explanation:

N2 (g) + H2 (g) gives out NH3 (g)

Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.

Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.(If you balance the hydrogen reactant with a whole number first, I can guarantee you that you will have to give NH3 a new stoichiometric coefficient.)

N2 (g) + 3H2 (g) gives out 2NH3 (g)

The stoichiometric coefficients tell you that if we can somehow treat every component in the reaction as the same (like on a per-mol basis, hinthint), then one "[molar] equivalent" of nitrogen yields two [molar] equivalents of ammonia.

Luckily, one mol of anything is equal in quantity to one mol of anything else because the comparison is made in the units of mols.

So what do we do? Convert to

mols (remember the hint?).

28g N2 × 1 mol N2/ 2 × 14.007) g N2

= 0.9995 mol N2

At this point you don't even need to calculate the number of mols of H2 . Why? Because H2 is about 2 g/mol, which means we have over 10 mols of H2. We have 1 mol N2, and we need three times as many mols of H2 as we have

N2.

After doing the actual calculation you should realize that we have about 4 times as much H2 as we need. Therefore the limiting reagent is clearly N2.

Thus, we should yield 2×0.9995=1.9990 mols of NH3 (refer back to the reaction). So this is the second and last calculation we need to do:

1.9990 mol NH3 × 17.0307 g NH3/ 1 mol NH3

= 34.0444 g NH3

Hope it helpz~

34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Mass of N₂ = 28g

Mass of H₂ = 25g

Moles of N₂ = mass / molar mass

                    = 28 / 28

                   = 1 mole

Moles of H₂ = 25 / 2

                     = 12.5 moles

Since the number of moles of N₂ is lesser, the amount of products formed depends on the moles of N₂.

From the reaction,

1 mole of N₂ gives 2 moles of NH₃

So, Mass of NH₃ in 2 moles = 2 × 17

                                              = 34g

B) From the reaction,

1 mole of N₂ reacts with 3 moles of H₂.

The number of Moles of H₂ left = 12.5 - 3

                                                    = 9.5 moles

Mass of excess reagent left = moles left × molar mass of H₂

                                             = 9.5 × 2

                                             = 19g

Therefore, 34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.

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Answer:

B. Color change

3&5

hope this helps <3

have a great day/night

-Dan

When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.

0.100 mole sample of ethane contains approximately 1.204 x \(10^{24}\) carbon atoms and 3.612 x \(10^{24}\) hydrogen atoms.

What are the atoms?

In one molecule of ethane (C2H6), there are 2 carbon atoms and 6 hydrogen atoms.

To determine how many atoms are present in a 0.100 mole sample of ethane, we can use Avogadro's number, which relates the number of particles (in this case, molecules) to the amount of substance in moles. Avogadro's number is approximately 6.02 x \(10^{23}\) particles per mole.

So, a 0.100 mole sample of ethane would contain:

Simplifying this expression, we get:

Therefore, a 0.100 mole sample of ethane contains approximately 1.204 x \(10^{24}\) carbon atoms and 3.612 x \(10^{24}\) hydrogen atoms.

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Answer:

When an acetic acid solution is titrated with sodium hydroxide, the slope of the titration curve (pH versus volume of NaOH added) increases when sodium hydroxide is first added. This change shows that acetic acid is being converted to sodium acetate.

Explanation:

ABOUT TITRATION - Titration is a chemical analysis method for determining the amount of a constituent in a sample by adding an exact known quantity of another substance to the measured sample with which the desired constituent reacts in a specific, known proportion. A burette, which is essentially a long, graduated measuring tube with a stopcock and a delivery tube at the bottom end, is used to gradually administer a standard solution of titrating reagent, or titrant.

It is feasible to identify a good visual color indicator for many titration processes that will signify the end point at, or very near to, the equivalence point.

Acid-base titrations, precipitation titrations, complex-formation titrations, and oxidation-reduction (redox) titrations are examples of such titrations, which are categorised according to the nature of the chemical reaction that occurs between the sample and the titrant.

Titrations of metal ions with the reagent disodium ethylenediaminetetraacetate are the most important titrations based on complex-formation processes (a salt of edetic acid, or EDTA).

Hence , the answer is that acetic acid is converted into sodium acetate.

If a beaker contains 15.6 moles of water, H\(_2\) O, 9.3×10²⁴  are the number of molecules this represent.

The smallest recognisable unit into that a pure substance may be divided while retaining its composition & chemical properties is a molecule, which is a collection of more than one atom.

Until parts made up of individual molecules are reached, splitting of a sample of an item smaller progressively smaller parts does not result in a change regarding its composition as well as its chemical properties.

5.number of molecules= 15.6 ×  6.022×10²³

                                  =9.3×10²⁴  

6. .number of molecules=0.317  ×  6.022×10²³

                                  =1.89×10²³

7. number of moles =6.01 x 10 25/ 6.022×10²³

                               = 100 moles

8.  number of moles =3.54 x 10²¹/ 6.022×10²³

                               = 0.005moles

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(a). Sodium hydroxide: NaOH, aluminum hydroxide: \(Al(OH)_3\)

(b). The parentheses are necessary for aluminum hydroxide because the hydroxide polyatomic ion has a subscript of 3, indicating that there are three hydroxide ions for every one aluminum ion.

a) The formula for sodium hydroxide is NaOH, and the formula for aluminum hydroxide is \(Al(OH)_3\)

b) Aluminum hydroxide requires brackets because there are three hydroxide ions for every one aluminum ion, according to the hydroxide polyatomic ion's subscript of 3. Without the parentheses, it would be unclear whether the subscript of 3 applies to only the oxygen or to the entire hydroxide ion. By enclosing the entire hydroxide ion in parentheses and placing the subscript outside the parentheses.

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Answer:

Explanation:

The molar mass of a given substance corresponds and pertains to the unit mole of the mass substance which is stated in g/mol

no of moles of H = mass of H/molar mass of H

= 2 kg/ 2 g/mol

= 2000 g/ 2 g/mol

= 1000 moles

moles of O2 = mass (O2)/ molar mass (O2)

= 2 kg/ 32 g/mol

= 2000 g / 32 g/mol

= 62.5 moles

Total moles present = (1000 + 62.5) moles

= 1062.5 moles

= 1.063 kmol

Total mass = 2kg + 2kg

= 4 kg

no of moles = mass/molar mass

molar mass = mass/ no of moles

molar mass = 4 kg/ 1.063 kmol

molar mass = 3.763 kg/kmol

The specific volume of the final mixture can be determined by the relation:

\(v_{mixture}=\dfrac{ V}{m}\)

where;

V = 3 m³

m = 4 kg

\(v_{mixture}=\dfrac{ 3 \ m^3}{4 \ kg}\)

= 0.75 m³/ kg

For the final volume, The molar specific volume is:

\(v_M = M_{mixture} *v_{mixture}\)

where;

\(M_{mixture} = 3.763\)

\(v_{mixture} = 0.75 \ m^3/ kg\)

∴

\(v_M = 3.763 \ kg/mol \times 0.75 \ m^3/kg\)

\(\mathbf{v_M = 2.82 \ m^3/kmol}\)

The concentration of the H2SO4 solution is 0.080 M.

The concentration of 50.0 ml of a solution of H2SO4 can be found by titrating the acid with a standardized solution of Ba(OH)2. This can be achieved by first preparing a 0.20M solution of Ba(OH)2 by dissolving a known mass of the reagent in distilled water and diluting to the mark. The end point is reached when all the H2SO4 has reacted with Ba(OH)2 and no more acid is left to react with the reagent.When 40.0 ml of 0.20M Ba(OH)2 titrant was added, we can calculate the amount of moles of Ba(OH)2 that reacted with the H2SO4 and use this value to find the concentration of H2SO4. To do this, we can use the following balanced equation:H2SO4 + 2Ba(OH)2 → BaSO4 + 2H2OFrom the balanced equation, we can see that one mole of H2SO4 reacts with two moles of Ba(OH)2. Thus, the number of moles of Ba(OH)2 used in the titration is given by:(40.0/1000) L × (0.20 mol/L) = 0.008 molWe can use the number of moles of Ba(OH)2 used to calculate the number of moles of H2SO4 present in the original solution. Since one mole of H2SO4 reacts with two moles of Ba(OH)2, the number of moles of H2SO4 in the solution is given by:0.008 mol Ba(OH)2 × (1 mol H2SO4 / 2 mol Ba(OH)2) = 0.004 mol H2SO4.The concentration of H2SO4 is then given by dividing the number of moles of H2SO4 by the volume of the solution in liters:0.004 mol / (50.0/1000) L = 0.080 M.

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Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

Answer:

Increase

Explanation:

More collisions mean more force, so the pressure will increase. When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume.

Answer:

Nitrifying Bacteria are a group of aerobic bacteria important in the nitrogen cycle as converters of soil ammonia to nitrates, compounds usable by plants. An example is nitrosomonas or nitrobacter and species in that family.

The schematic diagram is attached below, which summarises the oxidation of ammonia or free nitrogen in the soil to nitrates for the cowpea plant's utilisation.

Answer:

2.4 grams of ClF3

Explanation:

First let us determine the moles of Cl2 and F2,

Cl2 = (  ( 337 )( 2.05 L ) / ( 0.082 )( 298 K ) ) * ( 1 atm / 780 ),

Cl2 = ( 690 / 24.436 ) * ( 1 / 780 ),

Cl2 = ( About ) 0.036 moles of Cl2

_________________________________________________

F2 = ( ( 729 )( 2 L ) / ( 0.082 )( 298 K ) ) * ( 1 atm / 780 ),

F2 = ( 1458 / 24.436 ) * ( 1 / 780 )

F2 = ( About ) 0.078 moles of F2

Now let us identify the limiting reactant, considering the ratio between ClF3 and Cl2 / F2. In this case F2 is the limiting reactant, as it forms a smaller molar ratio;

The theoretic yield is thus performed with the limiting reactant F2,

0.078 * ( 2 / 3 ) * ( 92.45 / 2 ) = ( About ) 2.4 grams of ClF3

In Chemistry, there are two (2) main types of covalent bond and these include the following:

Electronegativity can be defined as the ability or tendency of the atom of an chemical element to attract any shared pair of electrons.

In Chemistry, the difference in electronegativity between an atom of nitrogen (N) and hydrogen (H) causes electrons to preferentially orbit an atom of nitrogen (N), thereby, making the bond polar.

Furthermore, the molecular shape of a molecule of ammonia (NH₃) is trigonal pyramidal and the molecule of a molecule of ammonia (NH₃) is polar.

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Complete Question:

Describe the characteristics of a molecule of ammonia (NH3). The Lewis structure and table of electronegativities are given.

The bond polarities are BLANK 1, the molecular shape is BLANK 2, and the molecule is BLANK 3.

blank 1 options: nonpolar, polar

blank 2 options: bent, linear, tetrahedral, trigonometry planar, trigonal pyramidal.

Blank 3 options: nonpolar, polar

This substance's empirical formula is \(C_{27}H_{48}O\).

The empirical formula for a compound is the simplest whole-number ratio of atoms of each element present in the compound. In this case, the compound contains 324 g of C, 48.5 g of H and 16.0 g of O. To calculate the empirical formula, we divide the mass of each element by its atomic mass. For C, divide 324 g by 12.01 g/mol, for H divide 48.5 g by 1.008 g/mol, and for O divide 16.0 g by 16.00 g/mol. Doing this gives us 27 moles of C, 48 moles of H and 1 mole of O. Since the numbers are not whole numbers, they need to be reduced to the lowest whole-number ratio. To do this, divide each number by the smallest of the three, which is 1 mole of O. This gives us 27 moles of C, 48 moles of H and 1 mole of O.Hence, this compound's empirical formula is \(C_{27}H_{48}O\).

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Explanation:

To calculate the heat gained by nickel, we can use the formula:

q = m * c * ΔT

where q is the heat gained, m is the mass of the nickel, c is the specific heat of nickel, and ΔT is the change in temperature.

Given:

- Mass of nickel, m = 31.4 g

- Specific heat of nickel, c = 0.443 J/g · °C

- Change in temperature, ΔT = 64.2 °C - 27.2 °C = 37.0 °C

Substituting the values into the formula, we get:

q = (31.4 g) * (0.443 J/g · °C) * (37.0 °C)

Simplifying the calculation, we get:

q = 584 J

Therefore, the heat gained by nickel when 31.4 g of nickel is warmed from 27.2 °C to 64.2 °C is 584 J.

To determine the tomato's velocity when it hits the ground, we need more information. Specifically, we need the height from which the tomato was dropped and the tomato mass.

Without these details, it is impossible to calculate velocity accurately. The velocity of an object when it hits the ground depends on factors such as the height of the fall, the mass of the object, and any forces acting on it during the fall (such as air resistance).

If you can provide the necessary information, I can help you calculate the velocity of the tomato when it hits the ground.

Answer:

temperature, or true. I don't know which you want.

Explanation:

hope this helps