4. In what period can you find Nitrogen on the periodic table?

Answer:

1) 5 kJ

2) 125 moles

3) 81.33 kJ

4) 135.9 grams

5) 15.165 kJ

6) 97.6 J

Explanation:

1) Molar mass of ice (water) = 18.015 g/mol

Number of moles, n, of ice = mass/(molar mass) = 15/18.015 = 0.833 moles

ΔHfus = 6.00 kJ/mol

Energy required, E = ΔHfus × n = 0.833 × 6 = 4.996 ≈ 5 kJ

2) Number of moles of ice that can be melted by E = 750 kJ is given by the equation;

n = E/(ΔHfus) = 750/6 = 125 moles

3) Given that ΔHvap = 40.7 kJ/mol, we have;

Number of moles of water, n = 36/18.015 = 1.998 ≈ 2 moles

Heat required = ΔHvap × n = 40.7 × 2 = 81.33kJ

4) Given that heat removed, ΔH= 307 kJ, we have;

n = ΔH/ΔHvap = 307/40.7 = 7.543 moles

Mass of water = Number of moles × Molar mass = 7.543 × 18.015 = 135.9 grams

5) Energy required, E for iodine to melt = Number of moles of iodine × ΔHfus of iodine

Number of moles of iodine = Mass of iodine/(Molar mass of iodine)

Number of moles of iodine = 248/126.9 = 1.954 moles

Energy required, E for iodine to melt = 1.954 × 7.76  = 15.165 kJ

6) Energy required, E for 4.24 g of lead to melt = Number of moles of lead × ΔHfus of lead

Number of moles of lead= Mass of lead/(Molar mass of lead)

Number of moles of iodine = 4.24/207.2 = 0.0205 moles

Energy required, E for iodine to melt = 0.0205 × 4.77 = 9.76 × 10⁻² kJ = 97.6 J.

Green plants use two molecules, carbon dioxide (CO₂) and water (H₂O), to make glucose through the process of photosynthesis.

During photosynthesis, plants capture energy from sunlight and convert it into chemical energy stored in glucose. The process occurs in the chloroplasts, which contain the pigment chlorophyll that gives plants their green color. Carbon dioxide is obtained from the atmosphere through tiny openings in the plant's leaves called stomata.

Water is absorbed by the roots and transported to the leaves through specialized tissues called xylem. In the first stage of photosynthesis, known as the light-dependent reactions, light energy is absorbed by chlorophyll, which triggers a series of chemical reactions that produce energy-rich molecules like ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).

These energy carriers are then utilized in the next stage. In the second stage, called the light-independent reactions or the Calvin cycle, carbon dioxide from the atmosphere enters the leaf and combines with the energy-rich molecules ATP and NADPH.

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The components of the ionic formula for nickel(III) sulfide are as follows: 1. The symbol for the element that forms the positive cation is Ni (nickel). 2. The symbol for the element that forms the negative anion is S (sulfur). 3. The subscript on the cation in the neutral formula is 2, which represents the number of nickel atoms in the formula. 4. The subscript on the anion in the neutral formula is 3, which represents the number of sulfur atoms in the formula.

To find the correct formula, we need to balance the charges of the ions. Nickel(III) indicates that the nickel cation has a charge of +3 (Ni3+), and sulfide has a charge of -2 (S2-). To create a neutral compound, we need two nickel ions (2 x +3 = +6) and three sulfide ions (3 x -2 = -6). Therefore, the balanced ionic formula for nickel(III) sulfide is Ni2S3.

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Answer:

116.64 g

Explanation:

74.23÷14 This is # of moles .

# of moles for co = 5.302

Then mass of co2 = 116.64

Answer:

0.0899 moles of oxygen (O2).

Explanation:

What is given?

Mass of sodium oxide (Na2O) = 11.15 g.

Molar mass of Na2O = 62 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation:

Let's calculate the moles of Na2O that are in 11.15 g of Na2O, using its molar mass:

Now that we have the moles of Na2O, let's do the stoichiometry: you can see in the chemical equation that 1 mol of oxygen (O2) reacted produces 2 moles of Na2O, so by doing a rule of three based on this data, the calculation will look like this:

The answer is that we need 0.0899 moles of oxygen (O2) to produce 11.15 g of sodium oxide.

Answer:

Explanation:

V1/T1 =V2/T2    at constnant pressure

Answer:

c

Explanation:

Answer:

the water displaced will not help the student find the correct volume because you can not accurately calculate it. you have to get the water when it is settled then you place the wood in.

Explanation:

The balanced equation for the reaction between oxalic acid (H2C2O4) and permanganate ion (MnO4-) in acidic solution to yield CO2 and manganous ion (Mn+2) is: 5H2C2O4 + 2MnO4- + 6H+ → 10CO2 + 2Mn+2 + 8H2O

This equation represents the redox reaction between oxalic acid and permanganate ion in acidic conditions. In this equation, there are 5 molecules of oxalic acid, 2 molecules of permanganate ion, and 6 hydrogen ions on the left-hand side. These react with each other to produce 10 molecules of carbon dioxide, 2 molecules of manganous ion, and 8 molecules of water on the right-hand side. The equation is balanced because the number of atoms of each element is the same on both sides of the equation.

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When 1-butanol is treated with p/I2 (phosphorus and iodine), the compound formed is 1-iodobutane.

The reaction involves the substitution of the hydroxyl group (-OH) of 1-butanol with an iodine atom (I). The iodine atom replaces the hydroxyl group, resulting in the formation of 1-iodobutane.

The substitution reaction occurs through the process of nucleophilic substitution, where the iodine acts as the nucleophile and attacks the carbon atom adjacent to the hydroxyl group. The iodine atom replaces the hydroxyl group, resulting in the formation of a new carbon-iodine bond.

The reaction is commonly known as the "phosphorus/iodine exchange" or "Appel reaction" and is often used to convert alcohols into alkyl halides. The use of phosphorus in the reaction helps facilitate the formation of the alkyl halide by activating the iodine and assisting in the substitution process.

Therefore, when 1-butanol is treated with p/I2, the compound formed is 1-iodobutane.

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Answer:

700 mL of ethanol would be added

Explanation:

Given data:

Volume of ethanol added to make 40% v/v solution = ?

Total volume of solution = 1750 mL

Solution:

We will calculate the 40% 1750 mL which will be the volume of ethanol added to the water to make 40%v/v solution.

(40/100)× 1750 mL

0.4 × 1750 mL

700 mL

700 mL of ethanol would be added.

Answer:

because the water brings a cool breeze when the wind blows

Explanation:

Answer:

Radium-226 is a radioactive decay product in the uranium-238 decay series and is the precursor of radon-222. Radium-228 is a radioactive decay product in the thorium-232 decay series. Both isotopes give rise to many additional short-lived radionuclides, resulting in a wide spectrum of alpha, beta and gamma radiations.

Answer : When mixing 538 grams of a substance into 647 ml of water, the concentration of the resulting solution in g/L is 0.83.

The concentration of the resulting solution in g/L can be calculated by dividing the mass of the substance (538 g) by the total volume of the solution (647 ml). This gives us a result of 0.83 g/L.

To further explain this calculation, we must first understand the concepts of mass and volume. Mass is a measure of the amount of matter an object contains. Volume, on the other hand, is the amount of space occupied by a given object. When mixing 538 grams of a substance into 647 ml of water, we are creating a solution with a certain concentration of the substance.

To calculate the concentration of the resulting solution, we must divide the mass of the substance (538 g) by the total volume of the solution (647 ml). This gives us a result of 0.83 g/L.

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Answer:

where a cold air mass is replacing a warmer air mass. ... The air behind a cold front is noticeably colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.

Explanation:

The effects from a cold front can last from hours to days. The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.

Answer:

Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.

Explanation:

Answer:

Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).

Explanation:

Primary source:

Hippocratic Oath (translation since it's originally in Greek)

I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:

To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.

I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.

I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.

In purity and according to divine law will I carry out my life and my art.

I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.

Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.

Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.

So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.

Answer:

London dispersion force

Explanation:

The main intramolecular forces between particles of carbon tetrafluoride (CF4) are London dispersion forces.

Carbon tetrafluoride is a nonpolar molecule, which means that it does not have a permanent dipole moment. However, the electrons in the molecule are not evenly distributed, and this creates a temporary dipole moment. These temporary dipole moments can interact with each other, which gives rise to London dispersion forces.

London dispersion forces are the weakest type of intermolecular force, but they are still important in determining the properties of carbon tetrafluoride. They are responsible for the low boiling point of carbon tetrafluoride, and they also play a role in its solubility in nonpolar solvents.

The concentration of the nitrogen after 44 seconds is 0.0175 mol/L.

We know that the rate of reaction has to do with how fast or slow that the reaction is progressing. If the reaction is not progressing that fast we could say that the rate of reaction is slow but if the reaction is moving on quite fast we could say that the rate of the reaction is fact.

Having said this, we can see that the reaction that we have here is the Haber process and it involves the combination of the hydrogen and the nitrogen to form the product of the reaction.

Rate of consumption of hydrogen = 0. 25 mol/L - 0. 50 mol/L /44 s

= -5.68 * 10^-3  mol/Ls-1

For the nitrogen molecule we would now have;

3/2 *  -5.68 * 10^-3  = M - 1.25/44

Let M be the final concentration of the nitrogen

-8.5* 10^-3 + 0.026 = M

M = 0.0175 mol/L

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Answer:

1.) protons or electrons 2.) ion

Explanation:

If it takes three breaths to blow up a balloon to 1.2 L and each breath supplies the balloon with 0.060 moles of exhaled air, the number of moles of air in a 3.0L balloon is 0.45 moles.

Given, the No of breaths taken to blow up a balloon to 1.2 L = 3

So the volume filled by 3 breaths = 1.2 L

No of moles of air in each breath  = 0.060 moles

No of moles of air in 3 breaths = 0.060 × 3

                                                  = 0.18 moles

No of moles in 1.2 L volume balloon = 0.18 moles

No of moles in 1 L volume balloon     = \(\frac{0.18}{1.2}\)

                                                            = 0.15 moles

Therefore, no of moles of air in 1L balloon  = 0.15 moles

Method -I

no of moles of air in 3.0 L balloon = 0.15 moles ×3

                                                         = 0.45 moles.

Therefore, no of moles of air in a 3L balloon is 0.45 moles.

Method -II

By ideal gas equation, for two different volumes of the balloon containing different number of moles of gas at constant pressure and temperature .\(V_{1}\) = 1.2 L ,\(V_{2}\) = 3 L ,\(n_{1}\) = 0.18 moles

\(\frac{V_{1}}{n_{1} }\) = \(\frac{V_{2}}{n_{2} }\)

\(\frac{1.2}{0.18}\) = \(\frac{3}{n_{2} }\)

\(n_{2}\) = \(\frac{3(0.18)}{1.2}\)

\(n_{2}\) = 0.45 moles

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To determine the number of moles of air in a 3.0L balloon, we divide the moles per breath by the volume per breath and then multiply by the volume of the balloon. The result is 0.15 moles of air in the balloon.

To calculate the number of moles of air in a 3.0L balloon, we can use the ratio of moles of air per liter based on the given information.

Since it takes three breaths to blow up a balloon to 1.2L and each breath supplies the balloon with 0.060 moles of exhaled air, we can calculate the moles per liter by dividing the moles per breath by the volume per breath.

Moles per liter = (0.060 moles/breath) / (1.2 L/breath)

Simplifying this equation, we find:

Moles per liter = 0.050 moles/L

To find the number of moles in a 3.0L balloon, we multiply the moles per liter by the volume of the balloon:

Moles of air = (0.050 moles/L) * (3.0 L)

Moles of air = 0.15 moles

Therefore, there are 0.15 moles of air in a 3.0L balloon.

The calculation is based on the given ratio of moles of air per liter of exhaled air. Since each breath supplies 0.060 moles of air and the volume of the balloon is given, we can determine the total number of moles of air in the balloon. By multiplying the moles per liter by the volume of the balloon, we obtain the desired result of 0.15 moles of air in the 3.0L balloon.

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O-H and N-H covalent bonds can create hydrogen bonds and have stable dipoles. The hydrogen atom generates a partial positive charge, whereas the electronegative atom generates a partial negative charge.

When a hydrogen atom bonds with an atom that is strongly electronegative, such oxygen, nitrogen, or fluorine, hydrogen bonding takes place.  Once attracted to one another, these partial charges create a weak link known as a hydrogen bond.

Because oxygen and nitrogen are extremely electronegative atoms in O-H and N-H bonds, respectively, they produce persistent dipoles in the molecule.

By becoming half positive as a result, the hydrogen atoms in these molecules can establish hydrogen bonds with other electronegative atoms.

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To determine the categorization of each solution of Er₂(SO₄)₃, we need to compare the concentration of Er₂(SO₄)₃ in each solution with its solubility at 20 °C, which is given as 137.6 g/L H₂O.

If the concentration of Er₂(SO₄)₃ in a solution is less than 137.6 g/L H₂O, the solution is unsaturated. This means that more solute can dissolve in the solvent.
If the concentration of Er₂(SO₄)₃ in a solution is exactly 137.6 g/L H₂O, the solution is saturated. This indicates that the maximum amount of solute has dissolved in the solvent at that temperature.
If the concentration of Er₂(SO₄)₃ in a solution exceeds 137.6 g/L H₂O, the solution is supersaturated. This occurs when the solute concentration is higher than the equilibrium solubility, usually achieved through cooling or evaporation.
By comparing the concentration of Er₂(SO₄)₃ in each solution with the given solubility of 137.6 g/L H₂O, you can categorize each solution as unsaturated, saturated, or supersaturated accordingly.

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The percent yield of the reaction is 46.2%.

The percent yield is a measure of the efficiency of a chemical reaction, and is calculated by comparing the actual yield (the amount of product actually obtained) to the theoretical yield (the amount of product that should be obtained based on stoichiometric calculations).

The balanced chemical equation for the reaction between aluminum hydroxide and hydrochloric acid is:

2Al(OH)3 + 6HCl → 2AlCl3 + 6H2O

From the equation, we can know that 2 moles of Al(OH)3 will produce 2 moles of AlCl3. We can now use this stoichiometric ratio to calculate the theoretical yield of AlCl3:

moles of Al(OH)3 = mass / molar mass = 14.0 g / 78.0 g/mol = 0.179 mol

moles of AlCl3 = 2 x moles of Al(OH)3 = 2 x 0.179 mol = 0.358 mol

mass of AlCl3 = moles of AlCl3 x molar mass = 0.358 mol x 133.3 g/mol = 47.7 g

The theoretical yield of AlCl3 is hence 47.7 g.

To calculate the percent yield, we need to divide the actual yield (22.0 g) by the theoretical yield (47.7 g) and multiply by 100:

percent yield = actual yield / theoretical yield x 100

percent yield = 22.0 g / 47.7 g x 100

percent yield = 46.2%

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Answer:

Hydroelectricity, or hydroelectric power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity, and was expected to increase by about 3.1% each year for the next 25 years.

Explanation:

Answer:

The electricity which is produced from flowing water or from the force exerted by the flowing water is called Hydroelectricity..

hope it is helpful to you

Answer: It requires heat as a reactant.