Ethanol is a possible fuel. Use average bond energies to calculate ΔHrxn for the combustion of ethanol.

CH3CH2OH(g) + 3O2(g) → 2CO2(g) + 3H2O(g)

The metals is very significance in human life and civilization.

There are many significance of metals in human life and civilization, some are given below.

To learn more about metals,

https://brainly.com/question/18153051

#SPJ2

70.9-gram sample of \(Cl_{2}\) gas will occupy Opton C. 22.4 liters at STP.

To determine the volume occupied by the sample of \(Cl_{2}\) (g) at STP, we can use the ideal gas law equation, PV = nRT

where P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature.

At STP (Standard Temperature and Pressure), the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (K).

First, calculate the number of moles of \(Cl_{2}\) (g) using its molar mass. The molar mass  \(Cl_{2}\) is 70.9 grams/mol.

Number of moles (n) = mass (m) / molar mass (M)

n = 70.9 g / 70.9 g/mol

n = 1 mol

Now, we can calculate the volume using the ideal gas law:

V = (nRT) / P

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

V ≈ 22.4 L

Therefore, the correct answer is C. 22.4 L.

Know more about STP here:

https://brainly.com/question/13656229

#SPJ8

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 500 × 4

We have the final answer as

Hope this helps you

The empirical formula of the solvent is CH4.

Relative number of atoms

Of H= 25/1 = 25

Of C= 75/12 = 6.25

What is a solvent?

To know more about solvents and solutes, click the link given below:

https://brainly.com/question/17061863

#SPJ4

The equilibrium constant equation for the reaction of diethyl methylamine

is C₆H₅N(CH₂CH₃)₂ + H₂O ⇌ C₆H₅N(CH₂CH₃)₂H⁺ + OH⁻.

The reaction of diethylmethylamine (C₆H₅N(CH₂CH₃)₂) with water can be represented as follows:

C₆H₅N(CH₂CH₃)₂ + H₂O ⇌ _______ + _______

In this reaction, diethyl methylamine acts as a weak base, and water acts as an acid. The weak base will accept a proton (H⁺) from water to form its conjugate acid, while water will lose a proton to form its conjugate base.

The left side of the equilibrium constant equation for this reaction can be filled in with the reactants, which are diethyl methylamine (C₆H₅N(CH₂CH₃)₂) and water (H₂O):

C₆H₅N(CH₂CH₃)₂ + H₂O ⇌ C₆H₅N(CH₂CH₃)₂H⁺ + OH⁻

On the right side, we have the conjugate acid of diethyl methylamine (C₆H₅N(CH₂CH₃)₂H⁺) and the hydroxide ion (OH⁻).

Learn more about equilibrium constant here:

https://brainly.com/question/31312272

#SPJ4

The complete question is:

Fill in the left side of this equilibrium constant equation for the reaction of diethyl methylamine (\(C_{5}H_{13} N\)), a weak base, with water.

Absolute zero is an idea in thermodynamics that describes the lowest energy system.

Thermodynamics

Thermodynamics is the study of thermal energy and heat. One of the most important ideas in thermodynamics is entropy. Entropy is defined as the chaos within a system. Chaos is the movement or different orientations of molecules in a system. Entropy is related to temperature; the higher the temperature, the higher the entropy. High entropy means there is a large amount of chaos in a system, while low entropy is low chaos.

Absolute zero

Absolute zero occurs when the temperature of a system is 0 kelvin or -273.15 °C. Zero kelvin is the theoretical temperature in which entropy equals 0. This means that there is no movement or energy within a system. Absolute zero is the lowest energy a system can possibly have.

Answer:

1. C₂H4

Explanation:

The only saturated hydrocarbons are Alkanes: From that we can see that: C3H12, C3H8 and C4H10 are saturated. Therefore: C2H4 is unsaturated

Evidence for a chemical reaction typically includes the production of bubbles, color change, and temperature change. However, phase change, which refers to a change in the physical state of matter, is not necessarily an indicator of a chemical reaction.

For example, water can undergo a phase change from a liquid to a gas without undergoing a chemical reaction. Therefore, phase change alone is not sufficient evidence for a chemical reaction. It is important to note that the presence of one or more of the other indicators (color change, temperature change, or production of bubbles) does not necessarily guarantee a chemical reaction has occurred either. Other factors must also be considered, such as the presence of reactants and products, and changes in chemical composition.

The evidence for a chemical reaction includes several factors, but not all options listed are indicative of a chemical reaction. Among the given options, phase change, color change, temperature change, and production of bubbles, the one that is not always evidence for a chemical reaction is a phase change.

Phase changes are more commonly associated with physical changes, such as melting or evaporating, rather than chemical reactions. On the other hand, color changes, temperature changes, and the production of bubbles (gas evolution) are more indicative of chemical reactions, as they often involve the formation of new substances or the release of energy.

To know more about Reaction visit :

https://brainly.com/question/30464598

#SPJ11

At STP, 22.4 liters of nitrogen gas (N2) will have a mass of 28 grams.

At STP (Standard Temperature and Pressure), which is defined as a temperature of 0°C (273.15 K) and a pressure of 1 atmosphere (atm), 22.4 liters of any gas will contain one mole of the gas.

This is based on Avogadro's Law, which states that equal volumes of gases at the same temperature and pressure contain the same number of particles, regardless of their chemical nature and physical properties.

To find the mass of 22.4 liters of nitrogen gas (N2) at STP, you first need to determine the molar mass of nitrogen gas. Nitrogen has an atomic mass of approximately 14 atomic mass units (amu). Since N2 is a diatomic molecule, meaning it consists of two nitrogen atoms, the molar mass of N2 is 2 * 14 amu = 28 grams per mole.

Now that you have the molar mass, you can determine the mass of 22.4 liters of nitrogen gas at STP. Since there is one mole of N2 in 22.4 liters at STP and the molar mass of N2 is 28 grams per mole, the mass of 22.4 liters of nitrogen gas at STP is:

1 mole * 28 grams per mole = 28 grams

Learn more about STP here :-

https://brainly.com/question/30778889

#SPJ11

The calculated density of the benzene is in agreement with the tabulated value

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can determine the density of the benzene. Detail below

From the question given above, the following data were obtained:

Density = mass / volume

Density of benzene = 21.95 / 25

Density of benzene = 0.878 g/mL

Thus, the density of the benzene is 0.878 g/mL

Thus, the calculated density is in agreement with the tabulated density

Learn more about density:

https://brainly.com/question/952755

#SPJ1

Answer:

a. atoms are made up of mostly empty space.(this is because most of the atoms were able to pass through the gold foil undeflected)

Explanation:

Answer:

a. atoms are made up of mostly empty space

Answer:

Explanation:

because they want to make us aliens

Answer: c

Explanation:

Answer:

4 meters

Explanation:

4 centimeters and millimeters are too small, while 4 kilometers is too large.

Answer:

C. Chloroform and alcoholic KOH

Explanation:

Secondary and tertiary amines do not react with CHCl3 and alc. KOH generates isocyanide, whereas primary amine does.

The empirical formula of the compound C₄H₁₀O₁.

The empirical method of a chemical compound is the simplest entire range ratio of atoms present in a compound. The empirical formula of a compound is the most effective whole variety ratio of atoms of each detail in the compound.

Step 1: decide the masses. Step 2: decide the variety of moles by dividing the grams by means of the atomic mass. Step 3: Divide the wide variety of moles of every detail through the smallest quantity of moles. Step 4: Convert numbers to complete numbers.

                                         divide by smallest

64.9% C /12 = 5.4             5.4/ 13.5  = 4

13.5% / 1 H  = 13.5             13.5 /1.35  = 10

21.6% / 16 O  = 1.35          1.5/1.5 = 1

Empherical formula = C₄H₁₀O₁

Learn more about empirical formula here:-https://brainly.com/question/1603500

#SPJ4

Answer:

Bromine is found in Group 17, Period 4 on the periodic table.

The pressure inside a container of gas increases if more gas is added to the container due to the increase in the number of molecules striking the walls of the container per unit time and the increase in the force of the collisions between the molecules and the walls of the container.

Pressure is defined as force per unit area and is usually measured in atmospheres (atm), millimeters of mercury (mmHg), or kilopascals (kPa).The molecules of gas in a container are in constant motion and collide with the walls of the container. When more gas is added to the container, the molecules have less space to move around and collide with the walls more frequently.

This leads to an increase in the number of collisions per unit time and therefore an increase in the force per unit area exerted on the walls of the container. This increase in force leads to an increase in pressure inside the container.In summary, the pressure inside a container of gas increases if more gas is added to the container due to an increase in the number of collisions and the force of the collisions between the molecules and the walls of the container.

Know more about  pressure   here:

https://brainly.com/question/24719118

#SPJ8

Answer:A

Explanation: Were there any living organisms is the answer because physics is the study of matter,its motion and behaviour of space and time and some other topics like energy and force.

Answer:

B

Explanation:

Forces and vectors on a probe are a physics thing

3.12 mg of sample will remain after 39.9 hours if the half life of iodine is 13.3 hours.

Half life of the reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first order reaction is a constant that is related to the rate constant for the reaction.

here, Half life of iodine is 13.3 hours. so,

Half life t1/2 = ln 2/ K

                k = 0.693 / t1/2

                   = 0.693 /13.3 hours

                   = 5.21 *10-2

The rate of a reaction is dependent on rate constant which is different for each reaction type. A first-order reaction is a reaction where the rate is dependent on the concentration of only one reactant. Because of this, it is also called a unimolecular reaction. The rate equation for this type of reaction is: Rate constant for first order reaction is,

k= 1/t ln [A]0 / [A]t

t = 39.9 hours

k = 5.21 * 10-2 / hour

putting all the values in the expression of rate constant for first order reaction we get,

[A]t = 3.12mg

To learn more about Half life please visit:

https://brainly.com/question/1160651

#SPJ4

Among the given options, C2H6 is the least soluble in water.The answer is option A. Ethane (C2H6) is a nonpolar hydrocarbon composed of two carbon atoms and six hydrogen atoms. Because water molecules are polar, they interact only with polar molecules or ions, not nonpolar ones.

As a result, Ethane (C2H6) lacks polar functional groups like OH, NH2, and COOH, and it is therefore nonpolar. It has no permanent dipole moment as a result of the symmetrical arrangement of the C-H bonds in a tetrahedral geometry, and it is only able to interact with water molecules via Van der Waal forces or London Dispersion Forces. Because water is a polar solvent, nonpolar compounds like C2H6 are poorly soluble in water. Therefore, among the given options, C2H6 is the least soluble in water.In summary, the answer is C2H6. The answer is option A

To know more about hydrogen visit-

https://brainly.com/question/30623765

#SPJ11

we should take out from point

(a) The rate of heat transfer is approximately 25.63 kW.

(b) The pressure drop across the tube bank is approximately 294.53 Pa.

(c) The rate of condensation of steam inside the tubes is approximately 0.023 kg/s.

(a) To calculate the rate of heat transfer, first find the overall heat transfer coefficient (U) using the Nusselt number and thermal conductivity of air. Next, find the total heat transfer area (A_t) using the tube diameter and number of tubes.

Finally, use the log mean temperature difference (LMTD) method to find the heat transfer rate (Q) using the formula Q = U * A_t * LMTD.

(b) To calculate the pressure drop, first find the drag coefficient (C_d) and then use the formula ΔP = (1/2) * ρ_air * V² * Σ(C_d) to calculate the pressure drop across the tube bank, where ρ_air is the air density and V is the mean velocity.

(c) To determine the rate of condensation of steam, use the heat transfer rate (Q) calculated in part (a) and divide it by the latent heat of vaporization (h_fg) of steam at the given temperature. This will give you the mass flow rate of condensation (m_cond).

Assuming air properties at 35°C and 1 atm is reasonable, as it represents the average temperature between the initial and final temperatures of the air in this process.

To know more about Nusselt number click on below link:

https://brainly.com/question/31139431#

#SPJ11

Answer: Na

Explanation:

on the left it says Na, and on the right it says Na2

The Schrödinger equation describes an atom's electronic wave function and energy levels. n, l, and ml are the three quantum numbers that identify the energy level, shape, and orientation of atomic orbitals. The values of n, l, and ml are integers that must satisfy certain constraints.

The principal quantum number (n) is the first quantum number that defines an atom's energy level. The angular momentum quantum number (l) specifies the shape of the electron cloud in an atom's orbitals. The magnetic quantum number (ml) specifies the orientation of the cloud, which corresponds to the direction of electron spin.

According to the above quantum numbers, the orbital's designation is 4f. The maximum value of l for a given n is n-1. Therefore, when n=4, l can range from 0 to 3, which implies that the atom can have s, p, d, and f orbitals. Because l=3, the subshell is designated f.

This subshell has a complex shape with two nodal planes passing through the nucleus. Furthermore, because ml=-2, the orbital's orientation is determined. It specifies that the subshell is aligned in a plane perpendicular to the z-axis, resulting in four equivalent lobes of electron density oriented in the xy plane.

The 4f orbital is one of the seven f orbitals, which can hold a maximum of 14 electrons. It is not included in the ground-state electron configuration of any of the naturally occurring elements since all elements have filled 1s, 2s, 2p, 3s, 3p, 4s, and 3d orbitals before 4f orbitals become available.

To know more about Schrödinger equation here

https://brainly.com/question/31642338

#SPJ11

The color of the observed emission in a flame test for a solution containing calcium nitrate, which produces a brick-red flame, is characteristic of the calcium ion. In a flame test, the metal ions in a compound are the primary contributors to the observed color.

This is because the metal ions get excited due to the heat from the flame and then release energy in the form of light when they return to their ground state. The nitrate ion, being a non-metal, does not significantly contribute to the color of the flame in this test. Instead, the nitrate ion acts as a spectator ion that doesn't participate actively in the flame test. The distinct brick-red color of the flame is a result of the specific electronic transitions that occur in the calcium ion. Thus, the characteristic color of the emission observed in the flame test for a solution containing calcium nitrate can be attributed to the calcium ion, not the nitrate ion or both.

Learn more about ions here:

https://brainly.com/question/20378033

#SPJ11

The weather would change if a cold front moves into your area and the following will apply.

So option A, B and C are correct.

What is weather?

The weather is described as the condition of the atmosphere in an area at a particular time. Weather is also the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy.

As a cold front moves into an area, the heavier cool air pushes under the lighter warm air, causing it to rise up into the troposphere the result being a gusty wind.

Learn more about weather at:

https://brainly.com/question/920732

#SPJ1

The correct order of increasing field strength of ligands to form coordination compounds is: a. F− < SCN− < C2O < CN−.

Ligands that are more electronegative and have smaller size tend to have higher field strength. They can exert a stronger pull on the electrons, resulting in a greater splitting of the d orbitals and forming stronger bonds with the metal ion.

Now let's analyze the given ligands in the order of increasing field strength:

a. F−

Fluoride ion (F-) is a small and highly electronegative ligand. Due to its small size, it can approach the metal ion closely, resulting in strong repulsion between the electron pairs in the d orbitals and the ligand electrons. This leads to a smaller splitting of the d orbitals and weaker bonding. Thus, F- has the lowest field strength among the given ligands.

b. SCN−

Thiocyanate ion (SCN-) consists of a sulfur atom (S) bonded to a carbon atom (C) and a nitrogen atom (N). It is a larger ligand compared to fluoride (F-) but still relatively electronegative. The size of the SCN- ion is intermediate between F- and C2O. Hence, its field strength is higher than F- but lower than C2O and CN-.

c. C2O

Oxalate ion (C2O) consists of two carbon atoms (C) bonded to two oxygen atoms (O) with a double bond between them. It is a larger ligand compared to both F- and SCN-. The presence of pi bonds in oxalate ligands can lead to increased overlap with the metal d orbitals, resulting in stronger bonding. Therefore, C2O has a higher field strength than both F- and SCN-.

d. CN−

Cyanide ion (CN-) consists of a carbon atom (C) triple-bonded to a nitrogen atom (N). It is a small ligand with high electronegativity. The small size and strong electron-withdrawing nature of the CN- ion allow for closer approach to the metal ion, causing a large splitting of the d orbitals and strong bonding. Hence, CN- has the highest field strength among the given ligands.

Therefore, the correct order of increasing field strength of the ligands to form coordination compounds is:

F- < SCN- < C2O < CN-

Learn more about coordination compounds at: https://brainly.com/question/29851773

#SPJ11

Answer:i think its Humans can cause some animals to become extinct, changing the food chain.

Explanation: