Is this a chemical or physical change and explain pls!!! I NEED HELP!!!!!!!!!!

Explanation:

I think a is correct answer

Answer:

true

Explanation:

To rank the following amines in order of decreasing base strength: NH₃ > (CH₃)₂NH > CH₃NH₂ > NH₂Br.

The order of base strength is determined by the availability of the lone pair of electrons on the nitrogen atom, which can be donated to form a bond with a proton (H⁺).

NH3 has the highest base strength because it has the most electron-donating groups (three hydrogens) attached to the nitrogen atom, making the lone pair of electrons more available.

(CH₃)₂NH is the next strongest base because it also has two electron-donating methyl groups attached to the nitrogen atom.

CH₃NH₂ has only one electron-donating methyl group, so it is weaker than (CH₃)₂NH.

NH₂Br is the weakest base because the electronegative bromine atom withdraws electron density from the nitrogen atom, making the lone pair of electrons less available.

Therefore, the correct ranking from strongest to weakest base is:

NH₃ > (CH₃)₂NH > CH₃NH₂ > NH₂Br.

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The pH scale will tell us how acid or basic a substance is, and this scale goes from 0 to 14. If you have a substance with a value below 7, it means this is an acidic substance, and if it's over 7, that means this is a basic substance. Bleach is a perfect example of everyday basic substance, since its pH is between 11-13, we will have in this case a very basic product

The heat of formation of nitrogen (II) oxide : +91.3 kJ/mol

Given

Reaction

N2(g) + O2(g) + 182.6 kJ → 2 NO(g)

Required

The heat of formation

Solution

In the above reaction, the heat of the reaction is located on the reactant side which indicates that the formation of nitric oxide requires heat (endothermic reaction).

In the above reaction the heat required to form 2 moles of NO, so the heat required for each mole is:

+182.6 kJ : 2 = =+91.3 kJ/mol

Answer:

they make tissue. form organ and whole body an i true..

No polar covalent bond form between the two nitrogen atoms in nitrogen gas.

The correct option is D) No because both atoms are equally electronegative.

Nitrogen gas is composed of two nitrogen atoms, which are both non-metal elements and have a similar electronegativity value (3.04). This means that they have equal pull on the shared electrons in the covalent bond, resulting in a nonpolar covalent bond. In a nonpolar covalent bond, the electrons are shared equally between the two atoms, and there is no separation of charge. Polar covalent bonds occur when two atoms with different electronegativities share electrons unequally, resulting in a partial separation of charges (a dipole). Hydrogen bonding occurs between molecules that have polar covalent bonds, and it requires a hydrogen atom covalently bonded to an electronegative atom (such as nitrogen, oxygen, or fluorine) to form a dipole-dipole attraction with another electronegative atom in another molecule.

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A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.

A lunar eclipse occurs when the Sun, Earth, and Moon align in the same line in which the Moon passes into Earth's shadow. In a total lunar eclipse, the entire Moon falls within the darkest part of Earth's shadow, called the umbra so we can conclude that claim 2  is the right answer about lunar eclipse.

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Answer:

Hof(X) = - 1474.9 KJ/mol

Explanation:

The reaction equation given to us is:

2 X + 5 O2 (g) --> 4 CO2 (g) + 6 H2O (g) ∆H = -75.0 kJ

Now, the equation for the standard enthalpy of formation of the reaction is written as follows:

ΔH = 4*Hof(CO2(g)) + 6*Hof(H2O(g)) - 2*Hof(X) - 5*Hof(O2(g))

where,

ΔH = - 75 KJ

Hof(CO2(g)) = Standard Heat of Formation of CO2(g) = -393.5 KJ/mol

Hof(H2O(g)) = Standard Heat of Formation of H2O(g) = -241.8 KJ/mol

Hof(X) = Standard Heat of Formation of X = ?

Hof(O2(g)) = Standard Heat of Formation of O2(g) = 0 KJ/mol

Therefore,

-75 KJ = (4)(-393.5 KJ/mol)+ (6)(-241.8 KJ/mol) - (2)(Hof (X)) - (5)(0 KJ/mol)

- 75 KJ + 3024.8 KJ = - (2)(Hof(X))

Hof(X) = -2949.8 KJ/2 mol

Hof(X) = - 1474.9 KJ/mol

your question:

Is questions 1,2,3 right? If not what is the right answers and can someone give me the answer for question 4

answer:

1. E

2. G

3. Correct - F

4. A

5. B

Hope this helps, have a great day! :)

The balanced equations of the reaction are given below:

Overall equation: 2 H_O → H₂O₂ (l)

Equation 1: H_O ---> H_O (g)

Equation 2: H_O (g) → H₂O₂ (g)

Equation 3: H₂O₂ (g) → H₂O₂ (l)

A balanced equation is an equation of a chemical reaction in which the number of moles of atoms for all the elements in the reaction is equal on both sides of the reaction.

A balanced chemical equation is obtained from the law of conservation of matter that states matter can not be created or destroyed.

Balancing chemical equations involves the addition of numerical coefficients to the reactants and products.

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Answer:

M₂  = 0.16 M

Explanation:

Given data:

Initial volume of solution = 20 mL

Initial concentration = 1.0 M

Final volume = 120 mL

Final/new concentration = ?

Solution:

Formula:

M₁V₁     =    M₂V₂

by putting values,

1.0 M × 20 mL = M₂ × 120 mL

M₂  = 1.0 M × 20 mL / 120 mL

M₂  = 20 M.mL /120 mL

M₂  = 0.16 M

Answer:

The cation is written first in the name; the anion is written second in the name. Rule 2. When the formula unit contains two or more of the same polyatomic ion, that ion is written in parentheses with the subscript written outside the parentheses.

When writing the formula of a compound that contains polyatomic ion, the metal is written first followed by the central atom in the ion and then other atoms that surround the central atom.

A poly atomic ion refers to an ion that comprises of more than one atom. Such ions are common in chemistry. Examples of polyatomic ions include; PO4^3-, BH4^- etc.

When writing the formula of a compound that contains a polyatomic ion, the metal is written first then the central atom in the ion follows before other atoms that surround the central atom in the ion.

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Answer:materials that impede the free flow of electrons from atom to atom and molecule to molecule.

Answer:

conductores can flow easily through the electrical component while the insulators not

The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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The order of activity from most active to least active in the given scenario is: zinc, iron, lead. This is because zinc is the most active element in the group, as it has the least number of valence electrons.

making it more likely to participate in chemical reactions and replace other elements. Iron is the next most active, as it has a higher number of valence electrons than zinc, but still fewer than lead, which is the least active element in the group due to its high number of valence electrons, making it less likely to participate in chemical reactions and replace other elements.A chemical element with the atomic number 30 and the symbol Zn is zinc (Zn). It belongs to the periodic table's group 12 and is a transition metal. A bluish-white, glossy metal with high conductivity for electricity, zinc is a substance. It reacts with oxygen and water to produce zinc oxide (ZnO) and zinc hydroxide (Zn(OH)2) due to its comparatively high reactivity. Brass manufacture, galvanizing (coating steel or iron to prevent corrosion), and alloying other metals all utilize it often.

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The volume of 6.9 mol of oxygen at 233 K and a pressure of 4.0 atm is approximately 12.0L.

To calculate volume of a gas, we can make use of Ideal Gas Law equation. It is a fundamental equation in thermodynamics that describes the behaviour of an ideal gas under certain circumstances. It relates pressure(P), volume(V), number of moles (n), and temperature(T) of an ideal gas using the equation:

PV = nRT

Where P = Pressure of the gas,

           V = Volume of the gas,

           n = Number of moles of the gas,

           R = Ideal gas constant commonly expressed as 0.0821  L·atm/(mol·K) or 8.314 J/(mol·K),

          T = Temperature of the gas.

In the question, we are given with:

n = 6.9 mol

T = 233 k

P = 4.0 atm

Substituting the above values in the equation to find the volume, we get:

4.0 * V = 6.9 * 0.0821 * 233

V = (6.9 * 0.0821 * 233) / 4.0

V = 11.9997 (approximately 12.0)

Therefore, The volume of 6.9 mol of oxygen at 233 K and a pressure of 4.0 atm is approximately 12.0L.

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Answer:

Typical organic fertilizers include mineral sources, all animal waste including meat processing, manure, slurry, and guano, plant based fertilizers, such as compost, and biosolids.

Answer:

A

Explanation:

l took the test

Based on the products formed when they react with water, the following is true:

AlCl₃ - Acidic.

NaBr - Neutral.

NaClO - Acidic.

3CH₃NH₃NO₃ - Acidic.

Na₂SO₃ - Basic.

A chemical compound is a substance made of numerous identical molecules joined by chemical bonds and containing atoms from various chemical elements. Therefore, a molecule composed entirely of one element's atoms is not a compound.

Here,

given set of solution:

(a) AlCl3

(b) NaBr

(c) NaClO

(d) 3CH3NH34NO3

(e) Na2SO3

AlCl3 produces hydrochloric acid, a potent acid, when it reacts with water. The mixture is going to be acidic.

When NaBr reacts with water, it creates Sodium Hydroxide, a powerful base, and Hydrobromic acid, a powerful acid. They will balance each other out because they are both powerful, leaving a neutral result.

Sodium Hydroxide, a weak acid and a strong base, are the products of NaClO. The solution will be simple.

Nitric Acid, a strong acid, and a weak base will be produced by 3CH3NH3NO3, making the solution acidic.

Na2SO3 would generate Sodium Hydroxide, a strong base, and a weak acid, making the solution basic.

The following is true based on the products formed when they react with water:

Acidic AlCl3.

NaBr is a neutral compound.

NaClO is an acidic compound.

3CH3NH3NO3 is an acidic compound.

Na2SO3 is a basic.

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As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy released allows parts of the engine to move. The chemical energy is all transformed into thermal and mechanical energy.

Mechanical energy is the sum of potential energy and kinetic energy that an object has due to its motion and position. It is the energy associated with the motion and position of an object.

For example, when a person lifts a weight and holds it above the ground, the person has done work and has increased the object's potential energy. This potential energy is converted to kinetic energy when the person releases the weight and it falls. The kinetic energy of the falling weight is converted to other forms of energy, such as sound and heat, when it strikes the ground.

On the other hand, when a car is accelerating, it is converting its chemical energy (from the gasoline) into mechanical energy. This mechanical energy is then used to move the car forward. The mechanical energy is then converted to other forms of energy, such as heat and sound, when the car brakes.

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Answer:

isobar

Explanation:

edge 23

Answer:

1.26mol/dm3

Explanation:

Answer:

it is the 'laws of conservation of mass'

cause it says the total mass of reactant equals to products

Answer:

Protection of issue is the law. You can likewise call it the protection of mass.

At the point when we balance a condition, we decide the proportion of reactants to items which takes into account the complete number of molecules of reactants to match the quantity of iotas of the items. Since the kind of molecules doesn't change (atomic cycles are an alternate story) and the quantity of iotas remains that equivalent, the all out mass that goes into the compound change will match the mass that emerges after the change.

Here is a model:

2

H

2

+

O

2

-> 2

H

2

O

Or then again

H + H + O=O - > H-O-H + H-O-H

There are 4H iotas when the response (each with a mass of 1 amu)

There are 2O iotas when the response (each with a mass of 16 amu)

The all out mass before the response is 4x1 + 2x16 = 36amu

The all out mass after the response is 4x1 + 2x16 = 36amu

Explanation:

Six normal kinds of synthetic responses are: amalgamation, disintegration, single-uprooting, twofold relocation, burning and corrosive base responses.

The root word for a hydrocarbon compound with 6 carbon iotas is Hex. In this way, on the off chance that an alkane has 6 carbon particles in it in an orderly fashion it will be called hexane.

Number of Carbons Name

   1                                        methane

    2                                       ethane

       3                                          propane

    4                                               butane

         5                                        pentane

     6                                     hexane

       7                                         heptane

   8                                      octane

9                                          nonane

   10                                      decane

     11                                           undecane

         12                                     dodecane

The reactant that is consumed first and limits how much product(s) that can be acquired is the restricting reactant. To recognize the restricting reactant, work out the quantity of moles of every reactant present and contrast this proportion with the mole proportion of the reactants in the fair synthetic condition

Answer: The ocean, soil and forests are the world's largest carbon sinks.

Answer:

B.Oceans

Explanation:

the answer is B. oceans

Answer:

the answer is strong acid

The correct answer is strong acid

If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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As heat and pressure act upon petroleum over millions of years, it undergoes a process called thermal decomposition or maturation, leading to the formation of hydrocarbon compounds with higher molecular weights. This process ultimately results in the formation of hydrocarbon mixtures known as crude oil and natural gas.

Under high temperatures and pressures, the long-chain hydrocarbon molecules present in petroleum undergo various chemical reactions, including cracking, polymerization, and condensation. These reactions break down the complex hydrocarbon structures and rearrange the carbon and hydrogen atoms to form simpler hydrocarbon compounds.

The exact composition and properties of the resulting hydrocarbon mixtures can vary depending on the specific conditions and source of petroleum. Crude oil typically contains a range of hydrocarbons, including lighter fractions such as gasoline and diesel fuel, as well as heavier fractions such as lubricating oils and bitumen.

If the conditions are more favorable for the formation of lighter hydrocarbons, such as in high-temperature and high-pressure environments, natural gas can be produced. Natural gas is primarily composed of methane (CH4) along with smaller amounts of other hydrocarbons like ethane, propane, and butane.

It's important to note that the transformation of petroleum into crude oil and natural gas occurs over geological timescales and involves complex geological processes. These processes typically take place deep underground in sedimentary basins where petroleum source rocks, such as shale or sandstone, are subjected to heat and pressure.

Overall, the application of heat and pressure on petroleum leads to the conversion of complex organic compounds into simpler hydrocarbons, resulting in the formation of crude oil and natural gas.

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The correct example of a resistor is option (B) a light bulb that impedes the flow of electricity.

A light bulb that impedes the flow of electricity is an example of a resistor.

A resistor is a passive two-terminal electrical element that implements electrical resistance as a circuit element. In digital circuits, resistors are used to reduce modern flow, regulate sign stages, to divide voltages, bias lively elements, and terminate transmission lines, amongst different uses.

A resistor is an electrical thing that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to offer a specific voltage for an lively tool such as a transistor.

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