Pressure is defined as the force exerted per unit of area. What is the SI unit of pressure?

a. N•m2
b. J
c. m/s2
d. N/m2

A cumulene molecule has 3 σ (sigma) bonds and 2 π (pi) bonds.

In cumulene, there are alternating single and triple bonds between carbon atoms, resulting in multiple π bonds. The number of σ bonds is equal to the number of carbon-carbon single bonds, while the number of π bonds is determined by the alternating triple bonds.

In the case of cumulene, it consists of three carbon atoms, and there are three σ bonds (one between each adjacent pair of carbon atoms) and two π bonds (resulting from the alternating triple bonds). These π bonds are formed by the overlap of p orbitals of the carbon atoms.

The presence of π bonds gives cumulene unique properties and reactivity.

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Cumulene has alternating sigma (σ) and pi (π) bonds. The number of these bonds depends on the number of carbon atoms in the molecule. For example, a four-carbon cumulene has 4 sigma bonds and 3 pi bonds.

The molecule of cumulene has alternating single and double bonds. A single bond is known as a sigma (σ) bond and a double bond is formed by a sigma and a pi (π) bond together. Therefore, in cumulene, depending on the number of carbon atoms, there will be 'n' sigma bonds, where 'n' is the number of carbon atoms, and 'n-1' pi bonds, reflecting the alternating pattern of single and double bonds. For example, in case of buta-1,2,3-triene (a type of cumulene with four carbon atoms), we would find 4 sigma bonds and 3 pi bonds.

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Nitrogen returns to the atmosphere through a process called denitrification.

This process is a vital component of the nitrogen cycle, which consists of several stages that ensure the circulation and transformation of nitrogen between the atmosphere, living organisms, and the environment. Here's a step-by-step explanation of how denitrification occurs:

1. Nitrogen fixation: Atmospheric nitrogen (N2) is converted into ammonia (NH3) by nitrogen-fixing bacteria or during natural processes like lightning. This makes nitrogen available for plants to use.

2. Nitrification: Ammonia is then converted into nitrites (NO2-) and nitrates (NO3-) by nitrifying bacteria. These are more accessible forms of nitrogen for plant absorption.

3. Assimilation: Plants absorb the nitrites and nitrates through their roots, incorporating the nitrogen into their cells for the production of proteins, DNA, and other essential molecules.

4. Ammonification: When plants and animals die, decomposer organisms break down their organic matter, releasing nitrogen in the form of ammonia back into the soil.

5. Denitrification: Finally, denitrifying bacteria convert nitrates and nitrites in the soil back into nitrogen gas (N2), which is released into the atmosphere, completing the nitrogen cycle.

Denitrification is an essential process that helps maintain the balance of nitrogen in the environment and ensures that it is available to support the growth and reproduction of plants and other living organisms.

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Answer:

Chemical was added in the zinc oxide to the theorems to reduce the zinc oxide.

Explanation:

Answer:

Shaggy off the today science ka sara kam yyyyyy the today science and technology y rocks and minerals and vitamins a

Answer:4

Explanation: I got it right

According to ideal gas law and kinetic molecular theory,the statement which describes  the characteristic of an ideal gas system is that  straight-line motion of the gas molecules is constant and random.

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

The ideal gas law was proposed by Benoit Paul Emile Clapeyron in the year 1834.He was a physicist and an engineer.It is often written in empirical form.It is called as an ideal gas  equation which is a good approximation of behavior of many gases.It has several limitations.

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In order to properly balance an equation, we need to make sure that the same amount of elements on the reactants side matches the number of elements on the products side, we can do that by increasing the number in front of each molecule, the so called stoichiometric coefficient. In the reaction from the question we can properly balance by adding the following stoichiometric coefficients

1. 2 H2 + O2 -> 2 HO2

2. FeCl2 + H2O -> FeO + 2 HCl

3. C4H8 + 6 O2 -> 4 CO2 + 4 H2O

4. ?

5. 2 NaOH + MgCl2 -> 2 NaCl + Mg(OH)2

Answer:

true

Explanation:

it says none renewable so you can't reuse it

Answer:

false

Explanation:

becuase nonrenewable means it can not be replenished

Answer: properties of matter that depend on the amount of the substance present are called extensive properties. Example- mass and volume. Those properties which do not depend on the amount of the substance are called intensive properties.

Explanation:

To calculate a chemical equation, balance the number of atoms of each element on both sides of the equation. Once the equation is balanced, calculate the number of moles of each reactant or product required for a specific chemical reaction.

A chemical equation is a written representation of a chemical reaction. It shows the reactants on the left side of an arrow and the product on the right side of the arrow.

First, balance the number of atoms of each element on both sides of the equation. If the equation is not balanced, add coefficients to the reactants or products to balance the number of atoms of each element.

A balanced equation can be used to calculate the number of moles of each reactant or product required for a specific chemical reaction. Use the molar mass of each reactant or product and the balanced equation.

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In a Lewis acid-base reaction, the base donates a(n) electron pair to form a new coordinate dative bond between the base and the acid.

In this type of reaction, the Lewis acid is a species that can accept an electron pair, and the Lewis base is a species that can donate an electron pair. The base donates its electron pair to the vacant orbital of the acid, resulting in the formation of a coordinate bond.

The electron pair donated by the base forms a bond with the Lewis acid, creating a new bond between the base and the acid. This coordinate bond is also known as a dative bond because both electrons in the bond come from the base.

Overall, in a Lewis acid-base reaction, the base donates an electron pair to the Lewis acid, resulting in the formation of a new coordinate bond between the base and the acid.

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Explanation:

done.....................

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

B. their outer electron levels are filled

Answer:

It's photosynthesis.

The final temperature of the water, given that the cube of brass heated to 95 degrees celsius was immersed in it is 80.6 °C

First, we shall determine the mass of the brass. Details below:

Mass = density × volume

Mass of brass = 88.25 × 10.684

Mass of brass = 939.686 g

Finally, we shall determine the equilibrium temperature in order to obtain the final temperature of the water. Details below:

Heat loss by brass = Heat gain water

MC(T - Tₑ) = MᵥᵥCᵥᵥ(Tₑ - Tᵥᵥ)

939.686 × 0.362 (95 - Tₑ) = 20 × 4.18(Tₑ - 22)

340.166332(95 - Tₑ) = 83.6 (Tₑ - 22)

Clear bracket

32315.80154 - 340.166332Tₑ = 83.6Tₑ - 1839.2

Collect like terms

32315.80154 + 1839.2 = 83.6Tₑ + 340.166332ₑ

34155.00154 = 423.766332Tₑ

Divide both side by 423.766332

Tₑ = 34155.00154 / 423.766332

Tₑ = 80.6 °C

Now, the equilibrium temperature is 80.6 °C

Thus, we can conclude that the final temperature of the water is 80.6 °C

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Answer:

i do not know

Explanation:

The symbols for chemical elements are based on their Latin or Greek names and often derived from their original or characteristic names. The symbol for silver is Ag, derived from the Latin word "argentum," while the symbol for potassium is K, derived from the Latin name "kalium."

The reason for these symbols not being directly derived from the English names of the elements is primarily historical. When the elements were first discovered or named, they were often named in Latin or Greek. As a result, the symbols used for elements are based on their Latin or Greek names to maintain consistency and to reflect the origins of chemical knowledge.

It is important to note that the symbols for elements are not simply arbitrary letters but are chosen to represent the elements in a standardized and concise manner. The use of Latin and Greek names provides a universal system that can be understood by scientists from different countries and linguistic backgrounds.

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The molecular formula of the compound is \(C_{4} H_{8}\)

We can calculate the empirical formula from the carbon and hydrogen percentage by assuming that we have 100 g of the substance:
carbon: 85.63 g / 12 g/mol = 7.1358 mol
hydrogen: 14.37 g / 1 g/mol = 14.37 mol
We divide the moles with the smallest amount to get a mole ratio:
7.1358 mol / 7.1358 mol = 1
14.37 mol / 7.1358 mol = 2.01
So the empirical formula is \(CH_{2}\), with the molar mass of 12 + 2 * 1 = 14 g/mol.
We can calculate the molar mass of the compound using ideal gas laws. At STP, 1 mol of any gas has a volume of 22.4 L, so:
1 mol : 22.4 L = X : 0.255 L
X = 1 mol * 0.255 L / 22.4 L = 0.0114 mol
From this, we calculate the molar mass of the gas:
0.0114 mol : 0.646 g = 1 mol : X
X = 0.646 g * 1 mol / 0.0114 mol = 56.67 g/mol
To get the molecular formula, we divide the molar mass of the gas by the molar mass of the empirical formula:
56 g/mol / 14 g/mol = 4
So now we multiply the empirical formula by 4 to get the molecular formula:
\(C_{4} H_{8}\)

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When the percent recovery is more than 100%, it means that you have more of the desired compound than you started with. The percent recovery is a measure of the amount of a desired substance that is obtained from a reaction, and it is typically calculated as follows: percent recovery = (actual yield / theoretical yield) x 100%If the percent recovery is more than 100%, it means that the actual yield is greater than the theoretical yield.

This can occur for a variety of reasons, such as: Contamination: The product may be contaminated with other substances that increase the mass of the sample. Reaction side products: A reaction may produce more than one product, and some of the byproducts may be included in the mass measurement.

Analytical error: There may be an error in the measurement of the mass of the sample or the product. These errors can occur due to a variety of factors, such as instrument calibration, sample preparation, or human error. In conclusion, a percent recovery of more than 100% likely indicates that you have more of the desired compound than you started with, but it is important to investigate the reasons for this result to ensure that it is accurate and reproducible.

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The molecular orbital (MO) model is most consistent with experimental evidence showing that molecular oxygen, O2, is paramagnetic.

In the MO model, molecular oxygen is described as having two unpaired electrons in its π* molecular orbital, making it paramagnetic. This model explains the observed magnetic properties of O2, as paramagnetic substances are attracted to a magnetic field due to the presence of unpaired electrons. The MO model also accounts for other properties of O2, such as its bond length and bond energy, which are consistent with experimental measurements. This model is widely accepted and supported by various spectroscopic and magnetic studies, providing a comprehensive understanding of O2's paramagnetism based on experimental evidence.

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To calculate Susie's required speed to make it to class on time, we need to determine the total time it takes her to traverse the three hallways.

Given:

First hallway distance = 35.0 m

Second hallway distance = 48.0 m

Third hallway distance = 60.0 m

We can calculate the total time as the sum of the time taken for each hallway:

Time is taken for the first hallway = Distance / Speed

Time is taken for the second hallway = Distance / Speed

Time is taken for the third hallway = Distance / Speed

The total time is then:

Total time = Time for first hallway + Time for second hallway + Time for third hallway

Since we know that Susie has 2 minutes (120 seconds) from the current time until the bell rings at 9:13 a.m., we can set up the equation:

Total time = 120 seconds

Now let's substitute the given distances into the time equations:

35.0 m / Speed + 48.0 m / Speed + 60.0 m / Speed = 120 s

Combining the terms:

143.0 m / Speed = 120 s

Solving for the speed (Speed = Distance / Time):

Speed = 143.0 m / 120 s

Speed ≈ 1.192 m/s

Therefore, Susie needs to run at approximately 1.192 meters per second to make it to class on time.

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The correct positions of the different molecular sizes within the column chromatography are as follows: Small molecules: Start,    Intermediate molecules: Middle, and    Large molecules: End

Chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase.

During the process of column chromatography, the different molecular sizes will settle at different positions. The small molecules are going to travel through the column at a much slower pace than the larger molecules. The three molecular sizes involved in the process of column chromatography are the following:

i) Small molecules

ii) Intermediate molecules

iii) Large molecules

Now, we have to place these molecules in their respective positions. The following is a drag and drop table which shows the positions of each molecule within the chromatography process:

Molecule size                      Position

Small molecule                         Start

Intermediate molecule           Middle

Large molecule                         End

Therefore, the correct positions of the different molecular sizes within the column chromatography are as follows:

Small molecules: Start      Intermediate molecules: Middle      Large molecules: End

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Answer:

An object with a high mass close to the Earth could be sent out into a collision course with the asteroid, knocking it off course. When the asteroid is still far from the Earth, a means of deflecting the asteroid is to directly alter its momentum by colliding a spacecraft with the asteroid.

Hope it helps!!

Answer:

1. deflect it 2. grab it with a claw 3. blast it to smithereens

Explanation:

Answer:

1.69×10²⁹ molecules.

Explanation:

The following data were obtained from the question:

Mass of Ammonia (NH3) = 5.25 tons

Molecules of Ammonia (NH3) =.?

Next, we shall convert 5.25 tons to grams (g). This can be obtained as follow:

1 ton = 907184.74 g

Therefore,

5.25 ton = 5.25 ton × 907184.74 g / 1 ton

5.25 ton = 4762719.885 g

Therefore, 5.25 tons is equivalent to 4762719.885 g

Finally, we shall determine the number of molecules of ammonia, NH3 in 4762719.885 g. This can be obtained as follow:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of ammonia, NH3 also contains 6.02×10²³ molecules.

1 mole of ammonia, NH3 = 14 + (3x1) = 14 + 3 = 17 g

17 g of ammonia, NH3 contains 6.02×10²³ molecules.

Therefore, 4762719.885 g of ammonia, NH3 will contain = (4762719.885 × 6.02×10²³) / 17 = 1.69×10²⁹ molecules.

From the calculations made above,

5.25 tons (4762719.885 g) of ammonia, NH3 contains 1.69×10²⁹ molecules.

Answer:

18.01528

Explanation:

find this by adding the molecular masses of two hydrogen atoms and oxygen atom

Answer:

1.)C₃H₈O

2)OH

3.)1-propanol

1.) C4H8O

2.) C2H6O or CH3CH2OH

3.)Ethanol

Now

\(\\ \sf\longrightarrow pH=-log[H^+]\)

\(\\ \sf\longrightarrow pH=-log10^{-2}\)

\(\\ \sf\longrightarrow pH=2\)

In Linear molecular geometry, the bond angle is 90°, in trigonal pyramidal geometry, bond angle is 107°, in trigonal planar geometry, bond angle is 120° and in tetrahedral, the bond angle is 109.5°.

In the linear geometry, the central atom has two side atoms attached which are at and bond angle of 180°.

In trigonal pyramidal geometry, the central atom has four side atoms which resembles a pyramid like structure. The bond angle between the two consecutive side atoms is 107°.

In trigonal planar geometry, three atoms are attached on the sides of central atom. The bond angle between these side atom is equal and of 120°.

In Tetrahedral geometry, the central atom and the side atoms makes a triangular prism like structure, the bond angle between side atoms is 109.5°.

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