For each reaction, predict the sign and find the value of ΔS°rxn; (b) 3H₂(g) 1 Fe₂O₃(s) → 2Fe(s) + 3H₂O(g)

The boiling point of the sucrose solution would be 3.68 °C compared to the boiling point of pure water.

The boiling point of a solution depends on the concentration of solute particles in the solution, which affects the colligative properties of the solution, such as boiling point elevation.

To calculate the boiling point elevation, we can use the following formula;

ΔTb = Kbm

where ΔTb is the boiling point elevation, Kb is the molal boiling point constant for water (which is a constant value), and bm is the molality of the solution, which is the amount of solute (in moles) per kilogram of solvent.

First, let's calculate the molality of the solution;

moles of sucrose = mass of sucrose / molar mass of sucrose

moles of sucrose = 739 g / 342.3 g/mol (molar mass of sucrose)

Next, let's convert the mass of water to kilograms:

mass of water = 0.300 kg

Now, we can calculate the molality of the solution;

bm = moles of sucrose / mass of water

Plugging in the values;

moles of sucrose = 739 g / 342.3 g/mol ≈ 2.158 mol

mass of water = 0.300 kg

bm = 2.158 mol / 0.300 kg ≈ 7.193 mol/kg

Next, we need to determine the molal boiling point constant (Kb) for water. The molal boiling point constant for water is approximately 0.512 °C kg/mol.

Finally, we can calculate the boiling point elevation;

ΔTb = Kb × bm

ΔTb = 0.512 °C kg/mol × 7.193 mol/kg

≈ 3.68 °C

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The specific heat capacity of liquid water is 4.18 J/g °C. The quantity of energy required to heat 1.50 g of water from 26.5°C to 83.7°C is 359 J.

The specific heat of a substance is defined as the heat required to raise a temperature of a substance by 1°C. In other words, it is also referred as a mass heat capacity.

The quantity of energy for a substance is calculated as

q=m×c×ΔT

Where ΔT=(T_f-T_i)

T_f=83.7°C, T_i=26.5°C

ΔT=(83.7-26.5)°C=57.2°C

And c=4.18 J/g °C

m=1.50g

Substitute all the values in the formula

q=1.50g×(4.18 J/g°C)×57.2°C

q=358.644 J

q=359 J

Therefore, the heat required for 1.50g of water is 359 J.

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The correct statement is a. At low temperatures, intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law.

The ideal gas law assumes that gas particles have no volume and do not interact with each other, which is not completely true for real gases. At low temperatures, the gas particles move more slowly and are closer together, making intermolecular forces, such as van der Waals forces, more significant. These forces cause the gas particles to attract each other, reducing the effective number of particles and lowering the pressure. Statements b, c, and d are false. At a given temperature, lighter gas particles travel faster than heavier particles, not more slowly (statement b). The average kinetic energy of a gas sample increases with temperature, not decreases (statement c). At high pressures, the volume of individual gas particles becomes significant and cannot be neglected (statement d).

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Answer:

An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton).

Answer:

Atoms consist of an extremely small, positively charged nucleus in which the protons and neutrons can be found, and is surrounded by a cloud of negatively charged electrons.

Answer:

The SI unit of volume is m³

Answer:

Answer: About 71 percent of the earth's surface is covered by water.

--Submitted by Robert Gagosian, Woods Hole Oceanographic Institute

Answer:

9

Explanation:

It is physical changes because it is not a chemical change

physical change is something that can be "fixed" but chemical can't for example rust on a bike is a chemical change.

Susan's diagram shows that it's bright on left half of the Moon because sunlight is coming from left and Moon's surface reflects sunlight like a mirror.

Susan's diagram shows that it's bright on the left half of Moon because sunlight is coming from left, and Moon's surface reflects sunlight like a mirror. The Moon doesn't produce its own light, so it relies on sunlight to be visible. When sunlight shines on the Moon, it illuminates parts of the Moon's surface that are facing the Sun, creating bright spot.

As the Moon orbits the Earth, different parts of the Moon's surface are illuminated by the Sun at different times, creating phases of the Moon that we see from Earth. In Susan's diagram, left half of the Moon is facing the Sun and is therefore illuminated, while right half is in shadow and appears dark.

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It is important to consider shedding when assessing the potential risks associated with biohazard experiments involving research animals, and to take appropriate precautions to minimize the risk of exposure to these hazards.True.

Shedding of biohazards from research animals is an important factor to consider when evaluating the risk of conducting experiments involving these animals.

Biohazards are infectious agents or biological materials that can pose a threat to human health, animal health, or the environment. The risk of exposure to biohazards can be influenced by a variety of factors, including the route of transmission and the amount of the infectious agent or biological material present.

Shedding refers to the release of infectious agents or biological materials from animals into the environment, which can increase the risk of exposure to these hazards.

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The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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The Avogadro's number is the constant number for the number of atoms or molecules represented in 1 mol, this number is equal to 6.022*10^23, to find out how many molecules there are in 6.0 moles we can set up this equation:

6.0 moles of CH4 * 6.022*10^23 molecules / 1 mol of CH4

The answer will be 3.61*10^24 molecules of CH4

Answer:

higher temperature increases reaction rates for both endothermic and exothermic reactions

Explanation: Sub to rockingmycoolstyle15 on yt

Answer:

19) 3.6920 × 10⁻⁵

20) 4.059× 10²

21) 2.46810121416 × 10³

22)  1.0000× 10⁻³

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

For example:

0.000036920

In scientific notation =  3.6920 × 10⁻⁵

405.9

In scientific notation  = 4.059× 10²

2468.10121416

In scientific notation  = 2.46810121416 × 10³

0.0010000

In scientific notation  = 1.0000× 10⁻³

Answer:

may be mp3 player......

Answer:

mp3 player

Explanation:

Neon sign contains Neon

Flash camera contains Xenon

Helium balloon contains Helium

Answer:

edge sample answer -

Lesson Question: What is the effect of temperature on the solubility of a solid in a liquid?

Explanation:

Atoms exist neutral because they contain an equal number of protons (+) and electrons (-). An ion of which element is larger than its atom is Ca.

Atoms exist neutral because they contain an equal number of protons (+) and electrons (-).

Ions exist as charged particles which exists created when atoms either gain or lose electrons. When atoms gain or lose electrons they evolve more stable.

Because they have an equal number of protons and electrons, atoms are neutral particles. Ions are electrically charged particles that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atoms to produce negative ions.

Therefore, the correct answer is option a) Ca.

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Answer:

1.29 g of NaCl.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

HCl(aq) + NaOH(s) —> NaCl(aq) + H2O(l)

Next, we shall determine the masses of HCl and NaOH that reacted and the mass of NaCl produced from the balanced equation.

This is illustrated below:

Molar mass of HCl = 1 + 35.5 = 36.5 g/mol

Mass of HCl from the balanced equation = 1 x 36.5 = 36.5 g

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of NaOH from the balanced equation = 1 x 40 = 40 g

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mass of NaCl from the balanced equation = 1 x 58.5 = 58.5 g

Summary:

From the balanced equation above,

36.5 g of HCl reacted with 40 g of NaOH to produce 58.5 g of NaCl.

Next, we shall determine the limiting reactant.

The limiting reactant can be obtained as follow:

From the balanced equation above,

36.5 g of HCl reacted with 40 g of NaOH.

Therefore, 1.82 g of HCl will react with = (1.82 x 40)/36.5 = 1.99 g of NaOH

From the calculations made above,

We can see that it will take a higher mass of NaOH i.e 1.99 g than what was given i.e 0.88 g to react completely with 1.82 g of HCl.

Therefore, NaOH is the limiting reactant and HCl is the excess reactant.

Finally, we shall determine the maximum mass of NaCl produced from the reaction.

In this case the limiting reactant will be used as it will produce the maximum mass of the products since all of it were consumed in the reaction.

The limiting reactant is NaOH and the maximum mass of NaCl produced can be obtained as follow:

From the balanced equation above,

40 g of NaOH reacted to produce 58.5 g of NaCl.

Therefore, 0.88 g of NaOH will react to produce = (0.88 x 58.5)/40 = 1.29 g of NaCl.

Therefore, 1.29 g of NaCl were produced from the reaction.

Answer:

The mass number is defined as the total number of protons and neutrons in an atom. Consider Table below which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

Explanation:

There are 0,419 moles of glucose in a sample that weights 75.5g.

To calculate the amount in moles of glucose in 75.5g, we first need the molar mass of this compound. To calculate that I'll be using the following atomic mass values:

C: 12

H: 1

O: 16

To calculate the molar mass, we multiply the number of atoms by the respective atomic mass:

(6 * 12) + (12 * 1) + (6 * 16) = 180 g/mol

Since the molar mass is 180 g/mol, we know that each mol has 180 g of glucose:

1 mol glucose ---------- 180g glucose

x --------------------------- 75.5g glucose

Solving for x, we have x = 0.419 moles of glucose

Answer:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

The molecular formula of the compound is C8H16O4.

To determine the molecular formula of a compound, you need to use the empirical formula and the molecular weight. The empirical formula, CH4O, gives the ratio of the elements in the compound. The molecular weight, 160, gives the actual mass of the compound.
To find the molecular formula, you need to determine the factor by which the empirical formula needs to be multiplied in order to get the molecular weight. In this case, the empirical formula has a weight of 12 + (4 x 1) + 16 = 32. The factor is 160/32 = 5.
Therefore, the molecular formula is the empirical formula multiplied by the factor:
C8H16O4 = (CH4O) x 5
So the molecular formula of the compound is C8H16O4.

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Answer:

Explanation:

To obtain pure crystals of iron sulfate from a mixture of copper carbonate and iron sulfate, you can use the process of filtration and crystallization. Here are the steps to follow:

Dissolve the mixture of copper carbonate and iron sulfate in water to form a solution.

Add dilute sulfuric acid to the solution, which will react with copper carbonate to form copper sulfate, carbon dioxide, and water. The iron sulfate will remain in the solution.

CuCO3 + H2SO4 -> CuSO4 + CO2 + H2O

Filter the solution to separate the solid copper sulfate from the iron sulfate solution.

Heat the iron sulfate solution to evaporate the water, leaving behind a concentrated solution of iron sulfate.

Allow the concentrated solution to cool slowly to room temperature to allow crystals of pure iron sulfate to form.

Filter the crystalized iron sulfate to separate it from any remaining solution.

Wash the crystals with distilled water to remove any impurities and allow them to dry.

By following these steps, you can obtain pure crystals of iron sulfate from a mixture of copper carbonate and iron sulfate.

Explanation:

Atomic number of Silicon..=14

Answer:

14

when liquid (at m.p. ) Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor.

Explanation:

Hope it is helpful....

The mass percent of CaCO₃(s) in the eggshell sample is closest to 136%.

The number of moles of carbon dioxide produced in the reaction can be calculated from the change in pressure of the gas:

ΔP = P₂ - P₁ = 0.870 atm - 0.800 atm = 0.070 atm

n = (ΔP * V) / (R * T)

Assuming the volume of the gas is the same as the volume of the acid, we can use the initial pressure and volume of the acid to calculate the number of moles of carbon dioxide:

n = (0.070 atm * 0.100 L) / (0.0821 L atm/mol K * 298 K) = 0.00272 mol CO₂

From the balanced equation, we know that one mole of calcium carbonate produces one mole of carbon dioxide:

CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l)

Therefore, the number of moles of calcium carbonate in the eggshell sample is also 0.00272 mol.

The mass percent of calcium carbonate in the eggshell sample can be calculated as follows:

mass percent = (mass of CaCO₃ / mass of sample) x 100%

mass of CaCO₃ = n x molar mass of CaCO₃

The molar mass of CaCO₃ is 100.09 g/mol.

mass of CaCO₃ = 0.00272 mol x 100.09 g/mol = 0.272 g

mass percent = (0.272 g / 0.200 g) x 100% = 136%

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Answer:

Respiration

Explanation:

Respiration is the system of how an animal breathes

Explanation:

Given,

Mass(m)=6.5kg

Velocity(v)=6 m/s

K.E.=1/2×mv^2

=1/2×6.5×6^2

=1/2×6.5×36

=117 J

The anatomical structure of the ear that contains the glands that secrete earwax is the outer ear or ear canal.

The ear canal is a tubular structure that extends from the outer ear to the eardrum. It is lined with skin and contains earwax, or wax-producing hair follicles and cerumen glands. Earwax is the natural secretion of the earwax gland and serves several purposes. Helps protect the ear canal from foreign objects such as dustand bacteria. It also acts as a lubricant for the ear canal, preventing dryness and itchiness of the skin in the ear canal. Excess earwax can build up in the ear canal, causing discomfort and hearing loss. In such cases, it is important to see a doctor to have the earwax removed in a safe and effective way.

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Answer:

A chemical reaction

Explanation:

somethingExplanation: