Why is nitrogen a gas at room temperature and carbon is a solid?.

Answer:

B. He

Explanation:

The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration

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The principal quantum number of the original number is 4 and original level of electron is 2.

The Balmer series refers to to a series of spectral emission lines of the hydrogen atom that occurs when an electron moves from higher energy  levels to the energy level of n= 2.

Hence;

λ =  486.3 * 10^-9 m

RH = 1.097 * 10^7 m-1

nf = 2

ni = ?

Using the formula;

1/λ = RH (1/nf^2 - 1/ni^2)

1/486.3 * 10^-9 = 1.097 * 10^7 (1/4 - 1/ni^2)

2.06 * 10^6/1.097 * 10^7 = (1/4 - 1/ni^2)

0.188 = 1/4 - 1/ni^2

1/ni^2 = 1/4 - 0.188

1/ni^2 = 0.25 - 0.188

1/ni^2 = 0.062

ni^2 = 16

ni = 4

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Answer:

b

Explanation:

Answer:

B) 4,1,2,3

Explanation:

Did it on USA Test prep. :)

Answer:

21.16 g

Explanation:

Balance the equation

3 Zn + 2 MoO3 = Mo2O3 + 3 ZnO

And prepare their molar masses

Zn - 65.38

MoO3 - 143.96

Mo2O3 - 239.92

ZnO - 81.38

Since Zn is the limiting reagent; (you can determine this by trial and error but I'm too lazy), basically 29.2 g of MoO3 needs 19.892 g of Zn to react; while 17 g of Zn would need 24.955 g of MoO3 so we have shiet leftover. So we should always use the limiting reagent, in this case,

Zn

as it gets used up completely.

Anyway:
We can now solve using the ratio between Zn and ZnO.
(17 g of Zn /

65.38 g per Zn) x (3 mol of ZnO / 3 mol of Zn) x (81.38 g per ZnO / 1 mol of ZnO) = 21.16 g of ZnO

sooooo you get

21.16 g

(typing this on mobile and kinda hungover so yea)

Answer:

The balanced equation tells us that 2 moles of sodium hydroxide react with 1 mole of sulfuric acid. Therefore, to react with 1.30 moles of sulfuric acid, we need:

$2 \times 1.30 = 2.60$ moles of sodium hydroxide.

To convert moles of sodium hydroxide to mass, we need to use its molar mass. The molar mass of sodium hydroxide is:

$1 \times 23.0 + 1 \times 16.0 + 1 \times 1.0 = 40.0$ g/mol.

Therefore, the mass of sodium hydroxide needed is:

$2.60 \text{ moles} \times 40.0 \text{ g/mol} = 104 \text{ g}$.

Answer: 104 g (with 3 significant figures).

The person driving the automobile needs to apply a force of 1800 Newtons to accelerate the automobile from 26 m/s to 30 m/s.

Initial velocity (u) of the automobile = 26 m/s

Mass (m) of the automobile = 450 kg

Final velocity (v) of the automobile = 30 m/s

To find the change in velocity of the automobile:

Change in velocity = Final velocity - Initial velocity

Change in velocity = 30 m/s - 26 m/s

Change in velocity = 4 m/s

The person accelerates the automobile by 4 m/s. We can calculate the force required to accelerate the automobile using the formula:

Force = Mass × Acceleration

Since we have the mass of the automobile (450 kg), we can calculate the force:

Force = 450 kg × 4 m/s^2

Force = 1800 Newtons

Therefore, the person driving the automobile needs to apply a force of 1800 Newtons to accelerate the automobile from 26 m/s to 30 m/s.

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Answer:

3.5 milligram

Explanation:

From;

N/No = (1/2)^t/t1/2

Where;

N = amount of Po-210 that remains unchanged after 414 days

No = 28.0 milligram of Po-210 originally present

t = 414 days

t1/2 = half life of Po-210 = 138 days

Substituting values;

N/28 = (1/2)^414/138

N/28 = (1/2)^3

N/28 = 1/8

8N = 28

N = 28/8

N = 3.5 milligram

Planck's equation demonstrates mathematically that the energy of a quantum is related to the frequency of the emitted radiation.

Einstein went further by explaining that, in addition to its wave like characteristics, a beam of light can be thought of as a stream of particles called photons. Planck's equation is used to calculate the energy of a photon based on its frequency:

E = hν

where E is the energy of the photon, ν is the frequency of the radiation, and h is Planck's constant.

Einstein built upon Planck's equation by proposing that light could have both wave-like and particle-like properties. He suggested that light could be thought of as a stream of particles called photons, each with a discrete amount of energy given by Planck's equation. This idea helped to explain certain phenomena, such as the photoelectric effect, which could not be explained by wave theory alone.

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The compound that will behave least like an ideal gas at low temperatures is the one with the strongest intermolecular forces, such as hydrogen bonding.

The behavior of a gas is determined by the interactions between its constituent molecules. At low temperatures, when the kinetic energy of the molecules is low, the intermolecular forces become more significant. Thus, a compound with strong intermolecular forces, such as hydrogen bonding, will deviate more from ideal gas behavior at low temperatures. This is because the attractive forces between the molecules will cause them to stick together more, reducing their ability to move independently as required for ideal gas behavior. Therefore, the compound that will behave least like an ideal gas at low temperatures is the one with the strongest intermolecular forces, such as hydrogen bonding.

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Answer:

The isopropanol evaporated while the water did not because the molecules don't stick together as strongly as the molecules in the water do. The water would need more energy transferred in, in order to evaporate.

Explanation:

The isopropanol evaporates and the water does not because the heat capacity and the latent heat of isopropanol is far lesser than that of water.

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Cellular respiration can occur either anaerobically (without oxygen) or aerobically. Glucose and oxygen interact during aerobic cell respiration. As byproducts, both water and carbon dioxide are produced.

In the majority of cells, glycolysis turns glucose into pyruvate, which mitochondrial enzymes then oxidize to produce carbon dioxide and water. However, due to the absence of mitochondria in some platelets, most notably adult red blood mitochondria, glycolysis serves as the only method of ATP synthesis.

The carbon dioxide moves out of the circulation, via the capillaries, and onto the alveoli where it is ejected, while at the same time oxygen bonds with hemoglobin to be transported back to the tissues once the venous returns to the lungs.

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Answer: In many ways, leaves have been planning all year for the coming winter by putting away energy and sugars to tide them over the coming winter. With temperatures falling in harvest time, generation of chlorophyll stops and the levels of this chemical inside clears out diminishes.

Explanation:

Answer above

:)

The specific heat capacity of water is 4.18 J/ °C g. 1500 ml of water is 1500 g thus the enthalpy change for a temperature difference of 24.2 to 25.9 degree Celsius is 10659 per mole or 1065.9 for 0.1 mol.

Calorimetry is an analytical tool used to determine the enthalpy change of a reaction. The calorimetric equation connecting the mass, temperature difference and specific heat capacity c is given by,

q = mc ΔT

Given that the volume of water is 1500 ml. Density of water is 1 g/ml thus mass of water is 1500 g. Specific heat capacity of water is  4.18 J/ °C g. Thus, the heat energy for the reaction taking place is calculated as follows:

q = 1500 g ×  4.18 J/ °C g × (25.9 - 24.2 °C)

  = 10659 J/mol

Hence, for 0.1 mol 10659  × 0.1 = 1065.9 J is the heat energy change for the reaction.

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Baking Soda is a substance is in nature.

Thus, An alkaline white powder called baking soda is a staple of contemporary kitchens. One significant brand is largely to blame for its rise. Dr. Austin Church and John Dwight, two brothers-in-law, joined forces to market baking soda in 1846 and baking soda.

The product was called Arm & Hammer Church & Co's bicarbonate of soda, and it was created in Dwight's kitchen. Arm & Hammer planned to demonstrate to the populace the ingredient's versatility by 1860.

They started handing out small cookbooks filled with recipes for various foods, including bread, cakes, cookies, puddings, and baking soda.

Thus, Baking Soda is a substance is in nature.

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I believe that Sam Sheppard is guilty because of the amount of evidence against him

Sam Sheppard was an American physician who was convicted and later acquitted for the murder of his wife, Marilyn Reese Sheppard, in 1954. The case was widely covered by the media and has been the subject of numerous books and movies.

The verdict of the case was a subject of much controversy and legal debate, with some people believing that Sheppard was guilty and others believing that he was wrongly convicted.

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Answer:

The thermal decomposition of ammonium nitrate to produce dinitrogen monoxide and water. This reaction takes place at a temperature of 200-260°C.

Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation. Hydrogenation involves the addition of hydrogen gas to unsaturated vegetable oils, resulting in the conversion of some of the unsaturated fats into saturated fats.

This process increases the melting point of the oil and transforms it into a solid or semisolid form.

During hydrogenation, vegetable oils are heated and mixed with a catalyst, typically a metal catalyst like nickel, in the presence of hydrogen gas. The unsaturated fats in the oil undergo a chemical reaction called hydrogenation, where the carbon-carbon double bonds in the fatty acid molecules are converted into single bonds. This saturation process reduces the overall degree of unsaturation in the oil and increases its stability and solidification properties.

The hydrogenated vegetable oils, commonly known as trans fats, have a higher melting point and are solid or semisolid at room temperature. This property makes them suitable for various food applications, such as margarine, shortening, and bakery products, where a solid or semisolid texture is desired. However, it is worth noting that the consumption of trans fats has been linked to adverse health effects, and many manufacturers are now moving towards healthier alternatives and reducing the use of hydrogenated oils in their products.

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Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation.

Hydrogenation involves adding hydrogen gas to vegetable oils in the presence of a catalyst, typically nickel or palladium. This process causes the unsaturated fats in the oils to undergo a chemical reaction, converting them into saturated fats.

Saturated fats have a higher melting point and are solid or semisolid at room temperature, unlike the liquid form of unsaturated fats. By hydrogenating vegetable oils, manufacturers can increase their stability, improve texture, and extend shelf life. This transformation allows vegetable oils to be used as margarine, shortening, or in the production of solid or semisolid food products like baked goods and spreads.

Therefore, it is important to note that hydrogenation can result in the formation of trans fats, which have been associated with negative health effects. To address this concern, many manufacturers are transitioning to alternative methods or using healthier oils in their products.

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Answer:

The answer is "Auger".

Explanation:

The Auger effect is an effect size when the vacancy of even an atom throughout the inner shell was complemented by the release of even an electron from the same atom. Whenever a central electron is lost, a higher energy level electron can drop into the void and release energy, which can be the result.

Blood has a normal pH of 7.41, which is equal to 1.0 x 10-7 M for [H+] and 1.0 x 10-7 M for [OH-]. With a pH of 15.3, [H+] = 1.0 x 10-15 M and [OH-] 1.0 x 10-15 M c, respectively. [H+] = 10-1.0 = 1.0 x 10-1 M and [OH-] = 10-1.0 = 1.0 x 10-1 M d. pH = -1.0. [H+] = 10-3.2 = 1.0 x 10-3 M and [OH-] = 10-3.2 = 1.0 x 10-3 M are the pH values.

e. With pOH = 5.0, [H+] = 105 M and [OH-] = 105 M, respectively. [H+] = 10-9.6 = 1.0 x 10-9 M and [OH-] = 10-9.6 = 1.0 x 10-9 M, respectively, for pOH = 9.6. The concentrations of hydrogen ions (H+) and hydroxide ions (OH-) in a solution are represented by the pH and pOH, respectively.

pH is While pOH is the negative logarithm of the concentration of hydroxide ions, pH is the negative logarithm of the concentration of hydrogen ions. We may use the equations [H+] = 10 pH and [OH-] = 10 pOH to get the [H+] and [OH-] for a specific pH or pOH. For instance, if a solution's pH is 7.41, then [H+] and [OH-] are each equal to 1.0 x 10-7 M and 10-7.41, respectively.

Similar to this, if a solution's pOH value is 9.6, then its [H+] and [OH-] concentrations are both equal to 10 9.6 and 1 x 10-9 M, respectively.

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Mr(Ga)=69.7231 with 4 digits.

Give an explanation of the relationship between atomic mass and abundance.

Given the percentage rarities of an element's isotopes, one may calculate the element's average atomic mass (Ar) by multiplying each isotope's Ar by the percentage, stated as a decimal, and adding the results. This can be done in a single line of work:

Mr(Ga) equals (68.92560.60108)+(70.92470.39892) Mr(Ga) equals 69.7231 to 4 decimal places.

In a similar manner, you may enter the percentages as normal before dividing by 100:

Mr(Ga)=(68.9256⋅60.108)+(70.9247⋅39.892)/100

69.7231 to four decimal places for 100 Mr(Ga).

Note that the solutions are same. Keep in mind that the answer is closer to 69 than it is to 71, which makes sense given that the universe contains a bigger percentage of gallium-69 (around 60%) than gallium-71 (30%).

Hence the answer is Mr(Ga)=69.7231.

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If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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The temperature necessary to increase the volume to 56.1 L if the pressure remains constant is 796.09 K. This is calculated using the expression of Charles's law.

According to the Charles's Law, the relationship between volume and temperature is,

      \(V_{1} / T_{1}\) = \(V_{2} / T_{2}\)

Here V1 is the initial volume and T1 is the absolute temperature and V2 is the final volume and T2 is the final temperature.

We know that at Constant pressure, Volume is directly proportional to the temperature of the gas.

T2 =  V1/ T1  * V2

A gas occupies 21.0 l at 1.00 atm. pressure and 298 k. It is necessary to increase the volume to 56.1 l if the pressure remains constant

here, V1 = 21.0 L

          V2 = 56.1 L

           T1 = 298K

Putting all the value in the expression of Charles's law we get,

T2 = 56.1 x (298/21.0)

    = 796.09K

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Electron groups around a central atom tend to spread out as much as possible because of the electron-electron repulsion principle, also known as the Pauli exclusion principle. According to this principle, electrons in an atom tend to occupy different energy levels, or orbitals, to minimize the repulsive interactions between them.

When electron groups are spread out as much as possible, the energy of the system is minimized, and the atoms are more stable. This is because the repulsive forces between the electrons are reduced when they are farther apart. This is known as the octet rule, which states that atoms tend to gain or lose electrons in such a way as to have eight valence electrons in their outermost shell, which is the most stable configuration.

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Answer:

Digestion is not an example of combustion. Digestion is an endothermic process where energy is utilized to break down the complex food molecules into simple forms. In a combustion reaction carbon dioxide,water,energy and some by products are released.

Explanation:

Answer:

A

Explanation:

there cnt be an increase photosynthesis.

surely when its cold,leaves dropped.

The approximately 75.06 grams of CaI2 and 36.27 grams of Na2SO4 are produced in the reaction.

a) The balanced chemical equation for the reaction is:

CaSO4 + 2NaI → CaI2 + Na2SO4

b) To determine the limiting reactant, we need to convert the masses of calcium sulfate (CaSO4) and sodium iodide (NaI) to moles. The molar masses of CaSO4 and NaI are 136.14 g/mol and 149.89 g/mol, respectively.

The moles of CaSO4 can be calculated as:

moles of CaSO4 = mass of CaSO4 / molar mass of CaSO4

              = 34.7 g / 136.14 g/mol

              ≈ 0.255 mol

The moles of NaI can be calculated as:

moles of NaI = mass of NaI / molar mass of NaI

            = 58.3 g / 149.89 g/mol

            ≈ 0.389 mol

Since the stoichiometric ratio between CaSO4 and NaI is 1:2, we need twice as many moles of NaI as CaSO4. Since we have fewer moles of CaSO4 (0.255 mol) compared to NaI (0.389 mol), CaSO4 is the limiting reactant.

c) Using the coefficients from the balanced chemical equation, we can determine the number of moles of each product produced. The ratio of moles of CaSO4 to moles of CaI2 is 1:1, and the ratio of moles of CaSO4 to moles of Na2SO4 is also 1:1.

Therefore, the number of moles of CaI2 produced is approximately 0.255 mol, and the number of moles of Na2SO4 produced is also approximately 0.255 mol.

d) Finally, we can convert the moles of each product to grams using the molar masses of CaI2 (293.88 g/mol) and Na2SO4 (142.04 g/mol).

The mass of CaI2 produced is:

mass of CaI2 = moles of CaI2 × molar mass of CaI2

            ≈ 0.255 mol × 293.88 g/mol

            ≈ 75.06 g

The mass of Na2SO4 produced is:

mass of Na2SO4 = moles of Na2SO4 × molar mass of Na2SO4

              ≈ 0.255 mol × 142.04 g/mol

              ≈ 36.27 g

Therefore, approximately 75.06 grams of CaI2 and 36.27 grams of Na2SO4 are produced in the reaction.

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The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.

This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.

For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.

Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.

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Answer:

We are given that the ring is made up of 20 carrat gold. 20 carrat gold means 20 parts of gold and 4 parts of other metal (usually copper or silver). Thus, the percentage of gold in 20 carrat gold will be

= (20 / 24) X 100

= 83.333 %

We can now calculate the mass of gold in the ring. We are given that the ring weighs 300 mg. So, the mass of gold in ring will be

= (83.333 / 100) X 300

= 250 mg

Thus, the mass of gold in 300 mg of the ring is 250 mg.

Now the molar mass of gold is 197 g. This means that there are 6.023 X 1023 atoms of gold in 197g of gold. Thus

197g of gold = 6.023 X 1023 atoms of gold

1g of gold = (6.023 X 1023 ) / 197 atoms of gold

250 mg or 0.25g of gold = (6.023 X 1023 X 0.25) / 197 atoms of gold

= 7.643 X 1020 atoms of gold

The chemical symbol of the element with a nucleus charge of +9 is F

The charge of the nucleus is determined by the number of protons it contains, as protons are positively charged particles.

The atomic number of an element refers to the number of protons in its nucleus, and it is represented by a whole number on the periodic table.

Therefore, the chemical symbol of the element whose nucleus has a charge of +9 is based on its atomic number, which is 9. The chemical symbol for this element is "F" for fluorine.

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