Which of the following best defines an acidic solution?​

Answer:In reality, if we are talking about an object under the influence of the Earth's gravity, the gravitational potential energy of the object will change minutely, even if kept at the same elevation above sea level, because of differences, if it is moved to different positions, due to changes in sub-surface rock masses

Explanation:

Branliest pls :)

Answer:

Hard water is water that has high mineral content, Soft water is free from dissolved salts of such metals as calcium, iron, or magnesium

Explanation:

Answer: (although the question does not sate whether if you separate them physically or through energy. so i did both)

1. can be separated (When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen)

2. can be separated, but through electrolysis, fiscally moving a crane to generate electricity to separate the molecules

3. Most solid particles, composed of diamagnetic or weak paramagnetic materials, cannot be extracted by a conventional magnetic separator. physically cannot be separated. but through heat yes

4. but there is a catch: doing so requires energy. ... If energy from coal were applied to drive the decomposition reaction, more CO2 would be released than consumed, because no process is perfectly efficient. so it cant be separated physically

5. it can be separated but it needs energy physically cannot be separated.

Explanation:

The energy gained by water is 1254 J.

Given,

Mass, m = 10.0g

Initial Temperature = 20°C

Final Temperature = 50°C

Specific heat capacity, c = 4.18 J/g·°C

H = mcΔT

where,

ΔT = Final Temperature - Initial Temperature

ΔT = 50 - 20  

ΔT = 30 °C

Substituting the given values,

H = 10 * 4.18 * 30

H = 1254 J

Therefore, the energy gained by water is 1254 J.

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Answer:

Your next meal, you, and your computer.

Answer:

your next meal, you and your computer.

You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.

One of the three primary methods for the transfer of heat energy is conduction. Radiation and convection are the other two methods through which heat is transferred. Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide.

In liquids and solids where particles are more closely spaced, conduction happens more easily than in gases, wherein particles are more widely spaced. When there is a significant temperature differential between both the substances that are in contact, the rate of energy transfer through conduction is increased.  You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.

Therefore, the correct option is option A.

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The oxidation number of Na in the compound Na2CO3 is +1.

To determine the oxidation number of Na in Na2CO3, we need to consider the known oxidation numbers of other elements and the overall charge of the compound.

1. The compound Na2CO3 contains two Na atoms and one C atom, along with three O atoms.

2. Oxygen (O) typically has an oxidation number of -2, unless it is in a peroxide where it is -1.

3. Carbon (C) is more electronegative than hydrogen (H) but less electronegative than oxygen (O), so it usually has an oxidation number of +4 in compounds.

4. The compound Na2CO3 has a neutral charge, which means the sum of the oxidation numbers of all the elements must be zero.

5. Let's assign the oxidation number of Na as x. Since there are two Na atoms, the total oxidation number contribution from Na is 2x.

6. The oxidation number of C in CO3 is +4, and the oxidation number of O is -2. Since there are three O atoms in CO3, the total oxidation number contribution from O is 3*(-2) = -6.

7. Setting up the equation: 2x + 4 + (-6) = 0.

8. Solving the equation: 2x - 2 = 0, 2x = 2, x = 1.

Therefore, the oxidation number of Na in Na2CO3 is +1.

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The mass percent (m/m) of NaCl in the solution is 27.6%. To calculate the mass percent (m/m) of the solution prepared by dissolving 59.43 g of NaCl in 155.6 g of H2O, we need to first find the total mass of the solution.

The total mass of the solution will be the sum of the masses of NaCl and H2O.

Total mass of the solution = Mass of NaCl + Mass of H2O
Total mass of the solution = 59.43 g + 155.6 g
Total mass of the solution = 215.03 g

Now, we can calculate the mass percent (m/m) of NaCl in the solution using the formula:

Mass percent (m/m) of NaCl = (Mass of NaCl / Total mass of the solution) x 100%

Substituting the values, we get:

Mass percent (m/m) of NaCl = (59.43 g / 215.03 g) x 100%
Mass percent (m/m) of NaCl = 27.6%

Therefore, the mass percent (m/m) of NaCl in the solution is 27.6%.

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Answer:

A. liver

I hope this helps!

Answer:

Explanation:

The problem is that there really are 2 correct answers. The kidneys fill the bladder and the bladder expels the liquid (including alcohol) from the bladder.

More directly, the sweat glands can expel the alcohol.

Since both are correct, the most direct answer is sweat glands, but don't be surprised to find out it is the kidneys.

Answer:

Huh? I guess it's

Explanation:

Answer:

Answer:

c. main energy level of an electron

Explanation:

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are considered to be the building blocks of matter and as such defines or determines the structure of a chemical element.

Generally, atoms are typically made up of three distinct particles and these includes; protons, neutrons and electrons.

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

The principal quantum number, denoted by n, represents the main or overall energy level of an electron.

Basically, this property of an electron determines its energy level, as well as its distance from the nucleus of an atom of any chemical element. Also, as the distance of each orbital from the nucleus increases, the energy level increases respectively. Thus, sets of orbitals having the same principal quantum number (n) are generally referred to as an electron shell.

Explanation:

For those who like to step beyond the challenge, the mass of the materials could be measured to check the methodology. Prior to separating the mixture, measure the mass of the total mixture. After separating and drying all the materials, measure the mass of each material. Add the three masses together. The total should equal the initial mass if all materials were recaptured during the separation process.

Iron particles will be drawn towards a magnet when one is used. In this manner, aluminum powder and iron powder can be separated. Due to the fact that iron is magnetic but the other three are not.

Magnets are used in magnetic separation, a waste management technique, to remove metal from the trash. As the materials are gathered together and segregated before processing, this is most frequently seen in single and mixed streams of recycling.

This method can be used to eliminate unwanted metals from products. All materials are kept pure by it. Recycling facilities frequently use magnetic separation to isolate metals, purify ores, and separate components from recycling.

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The mechanism that accounts for the reaction of 4-bromotoluene with sodium amide to form a mixture of 3- and 4-aminotoluene is nucleophilic aromatic substitution by addition-elimination. The correct alternative id option 2.

In this mechanism, the sodium amide acts as a strong nucleophile and attacks the electrophilic carbon in the aromatic ring of 4-bromotoluene.

The resulting intermediate is a highly unstable negative charge on the carbon atom of the ring, which is stabilized by the electron-withdrawing effect of the bromine substituent. The negative charge is delocalized around the ring, making the intermediate highly reactive.

The intermediate then undergoes an elimination reaction, in which the bromine atom is displaced by the incoming nucleophile, the sodium amide.

This creates an unstable intermediate with a negative charge on the carbon atom and a positively charged nitrogen atom. This intermediate quickly rearranges to form the final product mixture of 3- and 4-aminotoluene.

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Answer:

Materials that do not let current flow easily are called insulators.

Most nonmetal materials such as plastic, wood and rubber are insulators

Explanation:

Change the way you get around. ...

Be mindful of eating habits. ...

Grow your own food or buy it locally. ...

Embrace secondhand shopping. ...

Replace standard products with energy efficient versions. ...

Buy recycled products. ...

Spread the word. ...

Stop using plastic water bottles.

Answer:

hope it's help u

Explanation:

Stunning Ways to Save the Environment from Destruction

Change the way you get around. ...

Be mindful of eating habits. ...

Grow your own food or buy it locally. ...

Embrace secondhand shopping. ...

Replace standard products with energy efficient versions. ...

Buy recycled products. ...

Spread the word. ...

Stop using plastic water bottles.

Answer:

proton number

protons

Explanation:

Answer:

Proton, protons

Explanation:

The atomic number, or proton number is described as the number of protons in the nucleus of an chemical element. Electrons change on the atom/ion and neutrons change in the isotopes but the number of protons always stays the same and is considered a unique atom identifier.

Answer: a. atoms of two or more elements

For example:H20

Explanation:

D) is a molecule

B) doesn't need to be same element

Answer: a

Explanation:

Answer:

In general terms, because (1) the carbon-oxygen and hydrogen-oxygen bonds in ethanol are much more polar than any of the bonds in propane; (2) the oxygen atom in ethanol can form hydrogen bonds with the hydrogen atoms in water, but there is not such possibility with propane; and (3) propane contains more carbon atoms per molecule than ethanol.

Explanation:

In general terms, because (1) the carbon-oxygen and hydrogen-oxygen bonds in ethanol are much more polar than any of the bonds in propane; (2) the oxygen atom in ethanol can form hydrogen bonds with the hydrogen atoms in water, but there is not such possibility with propane; and (3) propane contains more carbon atoms per molecule than ethanol.

When energy expenditure proceeds at a slower, more steady pace, the metabolic breakdown of glucose-to-pyruvate-to-acetyl-CoA is termed Aerobic oxidation.

Because the oxidative system is aerobic, oxygen is required for it to work. Adenosine triphosphate, or ATP, is a compound that is produced by all three of these mechanisms. Your energy currency is this. ATP is your source of energy, whether you are sleeping, box jumping, or running a marathon. The method of production is the only distinction.

The aerobic or oxidative system, as it is often known (as it needs oxygen to produce energy), is a very complex yet crucial system for maximizing health and performance.

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Answer:

D

Explanation:

The front shown in item A differs from that shown in item B because: D. Two air masses form a boundary in item A while warm air rises above cold air in item B.

An occluded front can be defined as a composite weather front that is typically formed during cyclogenesis, which eventually causes a cold front to overtake a warm front and thereby, forcing it aloft with respect to air masses.

This ultimately implies that, an occluded front causes warm air to be mostly separated from a cyclone center that is experienced at the surface of planet Earth.

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The pH of a 0.10 M solution of carbonic acid is 3.12.

To calculate the pH of a solution, we use the equation pH = -log[H+], where [H+] is the concentration of hydrogen ions in the solution. In the case of carbonic acid, the dissociation equation is:

H2CO3 → H+ + HCO3-

The concentration of hydrogen ions in the solution is equal to the concentration of carbonic acid, which is 0.10 M. Plugging this value into the equation for pH, we get:

pH = -log[0.10]

pH = 3.12

Therefore, the pH of a 0.10 M solution of carbonic acid is 3.12.

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The pressure in a 28.0- L cylinder filled with 36.6 g of oxygen gas at a temperature of 349 K is 31.5 atm.

To calculate the pressure in a 28.0- L cylinder filled with 36.6 g of oxygen gas at a temperature of 349 K is 31.5 atm, we use the ideal gas law relates the pressure, temperature, and volume of a gas using the equation PV = nRT, where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the universal gas constant, and T is the absolute temperature of the gas. We can rearrange the ideal gas law equation to solve for pressure. That is:

P = (nRT) / V

Given that the volume of the cylinder is 28.0 L and it is filled with 36.6 g of oxygen gas at a temperature of 349 K, we need to first find the number of moles of oxygen gas present using the ideal gas law equation, n = (m/M), where m is the mass of the gas and M is the molar mass of the gas. The molar mass of oxygen is 32.00 g/mol. That is:

n = (36.6 g)/(32.00 g/mol) = 1.144 mol

Now we can plug the values into the ideal gas law equation and solve for pressure.

P = (nRT) / V

= [(1.144 mol) (0.08206 L atm/mol K) (349 K)] / (28.0 L)

= 31.5 atm

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Answer:

0.12 dm^3 x (1 mol/24 dm^3) = ? mols N2

mols Cu = ? mols N2 x (3 mols Cu/1 mol N2) = ?

Then g Cu = mols Cu x atomic mass Cu = ?

Answer:

C3H6O3

Explanation:

Hydroxyacetone

Answer:

Explanation:

P = 2.35g

Cl= 0.539 g

% MASS = mass of  X/ mass of a compound

 % mass of P =   2.35 / (2.35+ 0.539) =  81.34%

  % mass of Cl =  0.539 /(2.35+ 0.539) =  18.66 %

Answer:

what the person above me said

Explanation:

Answer:

so in one mole of atom there are 6.02×10^23.

answers to B is 2.41×10^24

Explanation:

use this equation

number of particle=moles X 6.02×10^23

=4 X 6.02 ×10^23

=2.41×10^24

hope this make sense:)

The number of particles present in 4 moles of a substance is 24.088 particles.

Moles is a unit to express the amount of any substance and in one mole of any substance 6.022 × 10²³ particles of that substance are present and this number is known as Avogadro's number.

As in 1 mole = 6.022 × 10²³ particles are present

In 4 moles = 4 × 6.022 × 10²³ = 24.088 particles are present

Hence, 24.088 particles are present in 4 moles.

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The shape of water, according to the VSEPR (Valence Shell Electron Pair Repulsion) theory, is bent or V-shaped.

This means that the arrangement of the atoms in a water molecule is not perfectly linear, but rather bent at an angle. The VSEPR theory is based on the idea that electron pairs surrounding a central atom repel each other and adopt an arrangement that minimizes these repulsive forces.

In the case of water \((H_{2}O )\), the central oxygen atom is bonded to two hydrogen atoms. The oxygen atom has two lone pairs of electrons in addition to the two shared electrons in the covalent bonds with hydrogen. These electron pairs repel each other, causing the hydrogen atoms to be pushed closer together, resulting in a bent shape. The bond angle in water is approximately 104.5 degrees.

The bent shape of water is important for understanding its properties and behavior. It contributes to the molecule's polarity, as the oxygen atom attracts electron density more strongly than the hydrogen atoms. This polarity leads to hydrogen bonding, which is responsible for many of water's unique properties, such as its high boiling point and surface tension.

Overall, the VSEPR theory predicts that water adopts a bent shape due to the repulsion between electron pairs around the central oxygen atom. This shape plays a crucial role in the molecule's properties and its ability to form hydrogen bonds, making water a vital substance for many biological and physical processes.

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