Which roller coaster
car has the least potential energy due to gravity

Answer:

Al

Explanation:

It has 3.

The heat of combustion of ethane (C2H6) in kilojoules per mole can be determined by subtracting the sum of the enthalpies of formation of the products from the sum of the enthalpies of formation of the reactants.

The enthalpy of formation is the change in enthalpy when one mole of a compound is formed from its constituent elements in their standard states. By referring to the table of thermodynamic properties, the enthalpies of formation for ethane (C2H6), carbon dioxide (CO2), and water (H2O) can be obtained.

The heat of combustion of ethane can be calculated using the following equation:

ΔHcomb = ΣΔHf(products) - ΣΔHf(reactants)

For the combustion of ethane, the reaction equation is:

C2H6 + 3.5O2 → 2CO2 + 3H2O

Using the enthalpies of formation from the table, the heat of combustion of ethane can be calculated.

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A positive value must exist for the ml quantum number. This assertion regarding the hydrogen atom's quantum mechanical solution is false.

An orbital is described by the three integer quantum numbers (n, l, and m) 0, 1, 2, and 3. Zero is not an option for the main quantum number (n).

A ground state orbital of type 1s with magnetic quantum number ml = 0 houses the lone electron in hydrogen.

The same electron can also be stimulated to higher energy levels like 2p, 3p, or 3d.

Higher np sub-levels of the hydrogen atom have magnetic quantum numbers, which are magnetic quantum numbers -1, 0 and 1.

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2,4,7-Trimethylnonane is the IUPAC name for the given compound.

(It's 2-d structure is attached with the solution.)

IUPAC stands for International Union of Pure and Applied Chemistry.

About IUPAC naming, a global standard for naming chemicals is to be established through the IUPAC system of nomenclature in order to improve communication. The system's objective is to assign each structure a distinct and clear name and to associate each name with a distinct and clear structure.

Whether in a continuous chain or a ring, the longest chain of carbons joined by a single bond serves as the basis for IUPAC nomenclature. According to a certain set of priorities, any deviations, whether multiple bonds or atoms other than carbon and hydrogen, are denoted by prefixes or suffixes.

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The order of the aqueous solutions from the lowest boiling point to the highest highest is :

NH₄NO₃  <  Na₂SO₄  <  CH₃OH  <  KBr  <  K₃PO₄

The highest the concentration of the solute particles , the higher the boiling point.

The dissociation of the K₃PO₄ is :

K₃PO₄  --->  3K⁺  +  PO₄³⁻

The molarity of the  K₃PO₄  = 0.475 M

The molarity of the ions = 4 × 0.475 M

The molarity of the ions = 1.9 M

Thus the K₃PO₄ is the highest boiling point.

The order of the boiling point from the lowest to the highest boiling point is as follows :

NH₄NO₃  <  Na₂SO₄  <  CH₃OH  <  KBr  <  K₃PO₄

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false,

sodium has a vigorous reaction with water.

This can be observed by putting a piece of sodium in water,

it moves swiftly across the surface of water and reacts violently.

Question a

Step 1

The average atomic mass of the element is calculated as:

--------------------

Step 2

Information provided:

Isotope 1:

10.0 % abundant and 23.8 amu.

Isotope 2:

40.0 % abundant and 24.6 amu.

Isotope 3:

25.8 amu, the % abundant = 100 % - 10.0 % - 40.0 % = 50.0 %

-----------------------

Step 3

Procedure:

Average atom mass = (10.0% x 23.8 amu + 40.0% x 24.6 amu + 50.0 % x 25.8 amu)/100 = 25.12 amu

Answer: 25.12 amu

Answer:

CIO- or HCIO. ^_________^

In a 2.50-L container with 56 g each of nitrogen and carbon dioxide gases added at 25°C, the partial pressure of nitrogen gas is 4.89 atm. The root mean square speed of an A₂ molecule at 0°C is approximately 8.65 m/s. None of the given options are correct.

Q1. We need to find the partial pressure (atm) of nitrogen gas in a 2.50−L container into which 56 g of each nitrogen and carbon dioxide gases are added at 25°C. Let's begin:
56g of N₂ will be equal to moles of N₂ = (56/28) = 2 mol N₂
56g of CO₂ will be equal to moles of CO₂ = (56/44) = 1.27 mol CO₂

Total moles of gas = 2 + 1.27 = 3.27 moles
Molar mass of N₂ = 28 g/mol
Ideal Gas equation = PV = nRT
Partial pressure of N₂ = P_N₂ = (n_N₂ * RT) / V
Where,
n_N₂ = number of moles of N₂ = 2 mol
R = gas constant = 0.08206 L atm K⁻¹ mol⁻¹
T = temperature in kelvin = (25 + 273.15) K = 298.15 K
V = volume of container = 2.50 L

Substituting the values in the formula, we get:
P_N₂ = (2 mol * 0.08206 L atm K⁻¹ mol⁻¹ * 298.15 K) / 2.50 L
P_N₂ = 4.89 atm

Therefore, the partial pressure (atm) of nitrogen gas in a 2.50−L container into which 56 g of each nitrogen and carbon dioxide gases are added at 25°C is 4.89 atm.

None of the given options are correct.

Q2. We need to find the root mean square speed (m/s) of an A₂ molecule (atomic mass =6amu ) at 0°C. Let's begin:

The root mean square speed (v rms) of an ideal gas is given by the formula:
v rms = √(3RT / M)
Where,
R = gas constant = 8.314 J/mol K
T = temperature in kelvin = 0 + 273.15 K = 273.15 K
M = molar mass of the gas = 6 g/mol = 6 / 1000 kg/mol = 0.006 kg/mol

Substituting the values in the formula, we get:
v rms = √(3 * 8.314 J/mol K * 273.15 K / 0.006 kg/mol)
v rms = √(3 * 8.314 J/mol K * 273.15 K / 6 * 10⁻³ kg/mol)
v rms = √(74.81)
v rms = 8.65 m/s (approx.)

Therefore, the root mean square speed (m/s) of an A₂ molecule (atomic mass =6amu ) at 0°C is 8.65 m/s (approx.).

None of the given options are correct.

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Complete Question:

Q24: What is the partial pressure (atm) of nitrogen gas in a 2.50-L container into which 56 g of each nitrogen and carbon dioxide gases are added at 25°C ? A) 39.00 B) 39.10 C) 17.90 D) 19.55 B) 15200

Q25: Calculate the root mean square speed (m/s) of an A2 molecule (atomic mass =6amu) at 0°C. 4) 1506 B) 1.135×10⁶ C) 1065.0 D) 1065.3 E) 753

Explanation:

A single replacement reaction is defined as a chemical reaction where one element replaces another element in one compound. The shape of this kind of reaction is:

A + BC ----> AB + C

If we consider our options, they are all double replacement reaction except from:

Zn (s) + H₂SO₄ (aq) ----> ZnSO₄ (aq) + H₂ (g)

Where zinc is replacing hydrogen in sulfuric acid.

Answer: C) Zn (s) + H₂SO₄ (aq) ----> ZnSO₄ (aq) + H₂ (g)

Answer:

As the axial tilt increases, then the seasonal contrast increases so that winters are colder and summers are warmer in both hemispheres. The northern hemisphere is tipped away from the Sun, producing short days and a low sun angle. What kind of effect does the earth's tilt and subsequent seasons have on our length of daylight (defined as sunrise to sunset). Over the equator, the answer is not much.

As for #5, it's mixed at the end of my answer, but just remember the spring equinox marks the change from 24 hours of darkness to 24 hours of daylight at Earth's poles .

Volume under the following condition is 280.47 cm³.

Given,

intial volume is 310cm³

temperature is 242K

final pressure is 840mmHg

pressure at STP is 1atm or 760mmHg

we have to find out volume at final pressure

Use Boyle's law

P1 * V1 = P2 * V2

Put the values from the question

760* 310 = 840 * V2

V2 = 760* 310 / 840

V2 = 280.47 cm³

Therefore, volume at final pressure is 280.47 cm³.

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Answer:

0.108 mol/L (to 3 s.f.)

Explanation:

Please see the attached picture for full solution.

A single water molecule (H-O-H) is held together by covalent bonds.

In a water molecule, one oxygen atom is bonded to two hydrogen atoms. These atoms are held together by covalent bonds, which involve the sharing of electrons between the atoms. Specifically, the oxygen atom shares one electron with each of the hydrogen atoms, and each hydrogen atom shares one electron with the oxygen atom. This sharing of electrons allows each atom to have a stable electron configuration, forming a strong and stable bond.

The resulting molecule has a bent shape, with an angle of approximately 104.5 degrees between the hydrogen-oxygen-hydrogen atoms. This shape contributes to the unique properties of water, such as its polarity and hydrogen bonding capabilities.

Additionally, water molecules have a dipole moment, meaning they have a slight positive and negative charge, allowing them to interact with other polar molecules. Overall, the structure and properties of the water molecule play a crucial role in its importance for life and the environment.

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Answer:

D) Water is less dense as a liquid than as a solid because of changes in bond structure.

Explanation:

I hope I was able to help!

Have a nice day :)

The correct statements about water is that hydrogen bonding causes water to be strongly cohesive and is less dense as a liquid and solid.

It is bonding in between the hydrogen atom and most electronegative atoms like flourine, chlorine, oxygen atoms, etc.

Hence water is less dense as a liquid than as a solid because of changes in bond structure and hydrogen bonding causes water to be strongly cohesive.

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Based on the available resources and profit per unit, producing 266 units of Product 1 would result in the highest total profit of BD 585.20.

To determine the maximum number of units of each product that can be produced given the available resources, we need to compare the resource requirements of the products with the available resources.

Let's calculate the resource requirements for each product:

Product 1:

- Metal sheet: 0.250 m2 per unit

- Glass sheet: 0.120 m2 per unit

- Electrical components: 3 units per unit

Product 2:

- Metal sheet: 0.150 m2 per unit

- Glass sheet: 0.050 m2 per unit

- Electrical components: 2 units per unit

Now let's compare the resource requirements with the available resources:

Metal sheets:

- Product 1 requires 0.250 m2 per unit, so the maximum number of units that can be produced using available metal sheets is 90 m2 / 0.250 m2 = 360 units.

- Product 2 requires 0.150 m2 per unit, so the maximum number of units that can be produced using available metal sheets is 90 m2 / 0.150 m2 = 600 units.

Glass sheets:

- Product 1 requires 0.120 m2 per unit, so the maximum number of units that can be produced using available glass sheets is 30 m2 / 0.120 m2 = 250 units.

- Product 2 requires 0.050 m2 per unit, so the maximum number of units that can be produced using available glass sheets is 30 m2 / 0.050 m2 = 600 units.

Electrical components:

- Product 1 requires 3 units per unit, so the maximum number of units that can be produced using available electrical components is 800 units / 3 units = 266 units.

- Product 2 requires 2 units per unit, so the maximum number of units that can be produced using available electrical components is 800 units / 2 units = 400 units.

Now let's determine the maximum number of units that can be produced for each product based on the limiting resource:

Metal sheets: The maximum number of units that can be produced is 360 units (for Product 1) since it requires a larger area of metal sheets.

Glass sheets: The maximum number of units that can be produced is 250 units (for Product 1) since it requires a larger area of glass sheets.

Electrical components: The maximum number of units that can be produced is 266 units (for Product 1) since it requires a larger number of electrical components.

Since the limiting resource for all three resources is reached with Product 1, the maximum number of units that can be produced for Product 1 is 266 units. As for Product 2, it can be produced up to a maximum of 250 units.

Now let's calculate the profit for each product:

Profit per unit for Product 1: BD 2.200

Profit per unit for Product 2: BD 1.400

Total profit for Product 1: 266 units × BD 2.200 = BD 585.20

Total profit for Product 2: 250 units × BD 1.400 = BD 350.00

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Answer:

6.02 x 10²³ electrons

Explanation:

Given parameters:

Mass of H₂  = 2g

Unknown:

Number of electrons = ?

Solution:

To find the number of electrons, we must determine the number of moles of H₂ first.

 Number of moles  = \(\frac{mass}{molar mass}\)  

  Molar mass of H₂   = 2(1)  = 2g/mol

Number of moles  = \(\frac{2}{2}\)   = 1mol  

1 mole of a substance contains 6.02 x 10²³ particles

the particles can be protons, neutrons, electrons

So,

  2g of H₂ will contain 6.02 x 10²³ electrons.

Answer:

Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of chemical bonds within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction.

The chemical energy and nuclear energy can be considered potential energy because both of them has energy stored in it.

Potential energy is any form of energy that has stored potential that can be put to future use such as nuclear energy, chemical energy in which the energy is stored in it so we can conclude that chemical energy and nuclear energy can be considered potential energy due to its storage of energy.

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Answer:

When an electric current is passed through acidified water, it decomposes to give hydrogen and oxygen gas. The hydrogen gas is obtained at the cathode and the oxygen gas is obtained at the anode

The pressure of the gas at the new location is approximately 7.92 atm.

To solve this problem using the formula provided, we need to plug in the given values for the initial state (denoted by subscript 1) and the final state (denoted by subscript 2) of the gas:

p₁v₁t₁ = p₂v₂t₂

where:

p₁ = 4.0 atm (initial pressure)

v₁ = 5.5 L (initial volume)

t₁ = 300 K (initial temperature)

p₂ = ? (what we are solving for)

v₂ = 2.0 L (final volume)

t₂ = 250 K (final temperature)

We can rearrange the equation to solve for p₂:

p₂ = p₁v₁t₁ / v₂t₂

Substituting the given values:

p₂ = (4.0 atm) x (5.5 L) x (300 K) / (2.0 L) x (250 K)

p₂ = 7.92 atm

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Answer:

its 9.2 atm

Explanation:

Answer:

% purity of limestone = 96.53%

Explanation:

Question (4).

Weight of impure CaCO₃ = 25.9 g

Molecular weight of CaCO₃ = 40 + 12 + 3(16)

                                              = 100 g per mole

We know at S.T.P. number of moles of CO₂ = 1 and volume = 22.4 liters

From the given reaction, 1 mole of CaCO₃ reacts with 1 mole or 22.4 liters of

CO₂.

∵ 22.4 liters of CO₂ was produced from CaCO3 = 100 g

∴ 1 liter of CO₂ will be produced by CaCO₃ = \(\frac{100}{22.4}\)

∴ 5.6 liters of CO₂ will be produced by CaCO₃ = \(\frac{100\times 5.6}{22.4}\)

                                                                              = 25 g

Therefore, % purity of CaCO₃ = \(\frac{\text{Weight calculated}}{{\text{Weight given}}}\times 100\)

                                                 = \(\frac{25}{25.9}\times 100\)

                                                 = 96.53 %

To solve this problem, we need to consider the heat transfer and the phase change that occurs when adding heat to ice. Let's break it down into two parts:

Part A: Final Temperature

The heat transfer equation for a phase change is given by:

Q = m * L

Where:

Q is the heat transferred

m is the mass of the substance undergoing the phase change

L is the latent heat of the substance

For ice, the latent heat of fusion is approximately 334,000 J/kg.

Given:

Mass of ice (m) = 1.5 kg

Heat added (Q) = 2.7 × 10^5 J

Since the temperature of the ice is initially below its melting point, we need to calculate the heat required to raise the temperature of the ice from -5.0°C to 0°C using the specific heat capacity of ice:

Q1 = m * c * ΔT

Where:

c is the specific heat capacity of ice

ΔT is the change in temperature

The specific heat capacity of ice is approximately 2,090 J/(kg·°C).

ΔT = 0°C - (-5.0°C) = 5.0°C

Q1 = 1.5 kg * 2,090 J/(kg·°C) * 5.0°C

= 15,675 J

Now, let's calculate the heat required for the phase change (melting):

Q2 = m * L

= 1.5 kg * 334,000 J/kg

= 501,000 J

The total heat added to the system is the sum of Q1 and Q2:

Total heat added (Q_total) = Q1 + Q2

= 15,675 J + 501,000 J

= 516,675 J

Now, we can use the heat transfer equation to find the final temperature:

Q_total = m * c * ΔT_final

Solving for ΔT_final:

ΔT_final = Q_total / (m * c)

= 516,675 J / (1.5 kg * 2,090 J/(kg·°C))

Simplifying the equation:

ΔT_final = 172.225 °C

The final temperature of the system is approximately 172°C (rounded to one significant figure).

Part B: Amount of Ice Remaining

To determine the amount of ice remaining, we need to consider the heat required to completely melt the ice. The heat required for complete melting is given by:

Q_melt = m_remaining * L

Where:

Q_melt is the heat required for melting

m_remaining is the mass of the ice remaining (what we need to find)

L is the latent heat of fusion

We can calculate Q_melt using the total heat added:

Q_melt = Q_total - Q1

= 516,675 J - 15,675 J

= 501,000 J

Now, we can find the mass of the ice remaining:

m_remaining = Q_melt / L

= 501,000 J / 334,000 J/kg

= 1.5 kg

The mass of the ice remaining is 1.5 kg (rounded to one significant figure).

Therefore, the final temperature of the system is approximately 172°C, and there is no ice remaining (1.5 kg has completely melted).

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mercury is not a mixture it is a element

Answer:

mercury

Explanation:

Answer:

Gems are natural material, metals are man-made materials!

Explanation:

Minerals occur naturally in the earth's crust and are defined as inorganic solids that have characteristic chemical composition and crystalline structures. ... A gemstone or gem is a piece of mineral crystal, which, in cut and polished form, is used to make jewelry or other adornments.

The explanation regarding the gems contains the various properties as compared to the metals should be described below:

In this way, it should be explained.

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Answer:

Schistosoma or blood fluke

Explanation:

Parasitic organisms are defined as the organisms that depends on other organisms body called host for their nutrition and harm the host body.

The given image is of Schistosoma that is commonly known as blood flukes. Schistosoma are flatworms which causes group of infections in humans known as  schistosomiasis. Schistosoma is a water-borne parasite and found in veins near the human intestine.

Hence, the correct answer is "Schistosoma or blood fluke".

Answer: I don't know how to add a picture, so I might not explain this well.

Explanation: You put Na in the first box. Then you put F in the center of the second box because it gained one electron from Na. Then in the third box you put Na [+] because it lost one electron so it's now an cation(has a positive charge) because it lost a valence electron. In the last box you would put F [-] because it gained one electron so it's now an anion( has a negative charge) because it gained a valence electron. F now has 8 valence electrons and Na has 8 as well therefore they're both balanced.

The final method of sodium fluoride is NaF. An ionic compound is formed with the aid of the complete transfer of electrons from a steel to a nonmetal and the ensuing ions have achieved an octet.

The chemical formula of sodium fluoride is NaF and its molar mass is 41.99 g/mol. it's miles an easy ionic compound, made from the sodium (Na+) cation and fluoride (F-) anion. The strong salt exists as cubic crystals just like the crystal structure of sodium chloride (NaCl).

Sodium fluoride is synthetic via the response of hydrofluoric acid with sodium carbonate or sodium hydroxide with the formula NaF. The most inexpensive chemical to be had for fluoridation is sodium fluorosilicate, formerly referred to as sodium silicofluoride.

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The reaction takes place using pinacol arrangement, so it can be arranged as shown.

The pinacol rearrangement is an acid-catalyzed process that dehydrates glycols and changes them into ketone or aldehyde molecules.

The more stable carbocation undergoes regioselective pinacol rearrangement, which yields the main or sole product.

It is possible to understand this reaction, which involves the creation of a carbenium ion intermediate followed by a rearrangement, to occur with a number of completely substituted 1,2-diols. The carbonyl compound is created when the first intermediate, a -hydroxycarbenium ion, undergoes a 1,2-alkyl shift. The Pinacol Rearrangement can be a ring-expansion or ring-contraction reaction if two of the substituents create a ring.

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