đun nóng lipit cần vừa đủ 40kg dung dịch NAOH 15%.Giả sử phản ứng xảy ra hoàn toàn. Khối lượng glixerol thu được là bao nhiêu?

Answer:

hola, soy bueno en química en algunas cosas y no tengo correo lo siento

Explanation:

oye hablas español

Answer:

5.92E-4 or 5.92x10^-4

Explanation:

Answer:

Elements

Explanation:

Each kind of atom is an element. Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.

Answer:

Elements

Explanation:

Elements such as those on the periodic table are unable to be broken down into simpler forms.

Mixtures (both homogenous and heterogenous) are made of multiple elements making it able to be physically broken down back to its original elements.

Compounds are also made up of multiple elements, however it must go through a chemical separation process in order for it to be broken down into its original elements.

Matter is a broad term of any substance. So it could both be a combination or a single element making it incorrect for this question.

Answer:

\({ \rm{2H {}^{ + } _{(aq)} + CO {}^{2 - } _{3(aq)} \: \: \: {}^{ { \huge{\dashrightarrow} }} _{ \huge{ \dashleftarrow}} }} \: \: { \rm{H _{2} CO _{3(aq)} }}\)

The pH of a 0.25 M solution of NaNO2= 6.65.

Given the concentration of NaNO2, we can find the concentration of NaOH and HNO2 as follows:

NaNO2 = 0.25 MNaOH = HNO2 = x

(since they have equal concentrations due to the stoichiometry of the reaction)

Thus, we can write the equilibrium constant expression as:

Ka = x^2/0.25

Now, let's solve for x:

x^2 = 0.25 x 4.5 x 10^-4x = √(0.25 x 4.5 x 10^-4) = 0.015

This value represents the concentration of both HNO2 and NaOH. Since we are interested in pH, we need to find the concentration of H+ ions using the following equation:

Kw = [H+][OH-]

Since we have found the concentration of OH- (which is the same as the concentration of NaOH),

we can solve for H+:

Kw = 1.0 x 10^-14[H+][0.015] = 1.0 x 10^-14[H+] = 6.7 x 10^-13

Finally, we can find pH:

pH = -log[H+]pH = -log(6.7 x 10^-13)pH = 6.65

Therefore, the correct option is d) pH = 6.65.

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Answer:

Cr2H6O7S so this the answer hope its useful

Answer:

b is the answer

The correct option for the dependency of any fraction of vacant lattice sites in a solid are the temperature  and the activation energy required for the formation of vacancy. Therefore option B and option C are correct.

As the temperature of any substance increses, the increasing thermal energy promotes vacancy formation and diffusion. So the temperature plays a very critical role in the formation of vacant lattice sites.

Secondly, the activation energy necessary for vacancy formation also affects the fraction of vacant lattice sites. Higher the activation energy  of a body , fewer the vacancies it will form. And hence the fraction of vacant lattice sites formed wil alsol be lower.

The other properties of a solid, like its density, melting point, or mechanical properties, may also be affected by the  crystal system and the atomic radius. But they do not directly affect the fraction of vacant lattice sites in any crystal.

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The reaction of 1-ethylcycloheptene with MCPBA (meta-chloroperoxybenzoic acid) followed by sodium methoxide in methanol leads to the formation of an epoxide.

MCPBA is a peracid that is commonly used to convert alkenes into epoxides through an epoxidation reaction. It adds an oxygen atom to the double bond of the alkene, resulting in the formation of an oxirane ring.

In this case, when 1-ethylcycloheptene reacts with MCPBA, an epoxide is formed. The specific product will depend on the regiochemistry and stereochemistry of the starting compound. Without further information on the exact structure and conditions of the reaction, it is difficult to determine the exact product.

However, the general product can be represented as an epoxide derived from 1-ethylcycloheptene:

Epoxide

1−ethylcycloheptene+MCPBA+NaOMe/MeOH→Epoxide

The exact position and stereochemistry of the epoxide ring would be determined by the specific structure of 1-ethylcycloheptene and the reaction conditions used.

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Answer: 1.88 g/mL

Explanation:

Mass of liquid a: (1.00)(15.0)=15.0 g

Mass of liquid b: (1.45)(35.0)=50.75 g.

So, the density is:

\(\frac{50.75+15.0}{35} =\boxed{1.88 \text{ g/mL}}\)

1.88 g/ml

Mass of liquid a: (1.00)(15.0)=15.0 g

Mass of liquid b: (1.45)(35.0)=50.75 g.

So, the density is:1.88g/ml

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

Density describes how compact or concentrated something is. For example, suppose you have two boxes, one large and one small. However, they both weigh the same. That means the small box has a higher density than the large box. Density also tells how concentrated or crowded something is.

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The net ionic equation focuses on the species that are directly involved in the reaction, highlighting the formation of solid calcium sulfate (CaSO4).

The reaction between sodium sulfate (Na2SO4) and calcium chloride (CaCl2) can be represented by the following balanced chemical equation:

Na2SO4(aq) + CaCl2(aq) → 2NaCl(aq) + CaSO4(s)

To write the complete ionic equation, we need to break down all the soluble compounds into their respective ions:

Na2SO4(aq): 2Na⁺(aq) + SO4²⁻(aq)

CaCl2(aq): Ca²⁺(aq) + 2Cl⁻(aq)

2NaCl(aq): 2Na⁺(aq) + 2Cl⁻(aq)

CaSO4(s): CaSO4(s)

By substituting the ions into the balanced chemical equation, the complete ionic equation is:

2Na⁺(aq) + SO4²⁻(aq) + Ca²⁺(aq) + 2Cl⁻(aq) → 2Na⁺(aq) + 2Cl⁻(aq) + CaSO4(s)

In the complete ionic equation, the ions that appear on both sides of the equation (Na⁺ and Cl⁻) are called spectator ions. They do not participate in the actual chemical reaction and can be eliminated from the equation. Simplifying the equation by removing the spectator ions gives the net ionic equation:

SO4²⁻(aq) + Ca²⁺(aq) → CaSO4(s)

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An example of a chemical change is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.

In chemistry, changes are classified into two: physical and chemical.

A physical change occurs when a substance or object changes its appearance, phase, or is used in a mixture. More importantly, a physical change does not change the molecular structure of a substance. These three are examples of physical changes in water, wherein the changes are on their phases only:

water freezing: liquid water becoming solid water

water boiling: solid water becoming gaseous water

water evaporating: liquid water becoming gaseous water

On the other hand, a chemical change takes place when the original substance's of molecules are taken apart and put back together into new combinations that are different from the original combinations. An example of this is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules, wherein a compound of water molecule is being break down into different molecules.

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The number of oxygen atoms in each formula unit of lead nitrite is equal to four.

A formula unit can be used to represent the lowest whole number ratio of ions in an ionic compound. The formula mass of an ionic compound is equal to the sum of the atomic masses of the ions in the formula unit.

A formula unit can be described as an empirical formula of any covalent or ionic compound that can be used as an independent entity for stoichiometric calculations.

Given the chemical formula of the Lead(II) nitrite is Pb(NO₂)₂. The number of oxygen atoms in each formula unit is four.

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The concept Gay Lussac's law is used here to determine the new outside temperature. The relationship between the pressure and absolute temperature of the gas is given by Gay Lussac's law. The outside temperature is 266.8 K.

Gay-Lussac's law states that the pressure exerted by a gas of given mass at constant volume varies directly with the absolute temperature of the gas.  The mathematical expression is P / T = k

For two gases,

P₁ / T₁ = P₂ / T₂

T₂ = P₂T₁ / P₁

T₂ = 28 × 305 / 32 = 266.8 K

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φ(g1 * g2) = eH = φ(g1) * φ(g2).

This completes the proof that φ: G → H is a group homomorphism.

By showing that the map φ preserves the group operation, we have demonstrated that it is a group homomorphism.

To prove that φ: G → H is a group homomorphism, we need to show that it preserves the group operation. In other words, for any two elements g1 and g2 in G, φ(g1 * g2) = φ(g1) * φ(g2), where * denotes the group operation in G, and * denotes the group operation in H.

Given that φ(g) = eH for all g ∈ G, where eH is the identity element in H, we can start the proof as follows:

Let g1, g2 ∈ G. We want to show that φ(g1 * g2) = φ(g1) * φ(g2).

Since φ(g) = eH for all g ∈ G, we have φ(g1) = eH and φ(g2) = eH.

Now, consider the product g1 * g2 in G. Applying φ to both sides, we have:

φ(g1 * g2) = φ(g1) * φ(g2).

Substituting the values of φ(g1) and φ(g2), we get:

φ(g1 * g2) = eH * eH.

Since eH is the identity element in H, the product eH * eH is simply eH.

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Volume of liquid water  would be approximately 24 million km³.

Volume(V) of ice at 20° is;

                    Vi = 26.8×10⁶ km³

Density is depend upon the mass and volume

∴   p =m/v

where;   p = Density

               m = Mass

                v = Volume

Density of ice p(i) = 0.92g /cm³

Density of water at 4°C is;

             p(w) = 1g/cm³

If ice is melt then,

          mass(m) of water = mass(m) of ice

              p(w) = p(i)

     V = p(i)/p(w)

    0.92g / cm³/1g/cm³×26.8×10⁶ km³

        24.5 ˣ 10⁶ km³

      ≈24 million km³

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In order to increase the temperature of the 42.2 g of water from 25°C to 55°C, 1266 calories of heat were applied.

4180 joules are equal to 20 x 1 x 50 x 4.18 joules. Assuming that the water is already liquid before heat is applied. The 4.18 represents the ratio of calories to joules: 1 Calorie = 4.18 Joules.

We can use the following calculation to determine how much heat has been added to the water:

Q = m × c × ΔT

where Q is the supplied heat, m is the mass of water, c is the water's specific heat, and T is the temperature change.

We must first determine the water's mass:

m = 42.2 g

The change in temperature must then be calculated:

ΔT = (55°C - 25°C) = 30°C

Water has a specific heat of 1 calorie/(gram °C).

Q = m × c × ΔT

Q = 42.2 g × 1 cal/(g °C) × 30°C

Q = 1266 cal

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Answer:

Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change— .

Electrons will be transferred during redox reaction.

The electron is subatomic particles which are placed in surrounding the nucleus. Electrons carry negative charge.

Redox reaction involve the transfer of electrons between intermediates. A redox reaction occurs when the oxidation states of the substrate change. The removal of electrons or even a rise in the oxidation state of such a chemical or its atoms is referred to as oxidation. The acquisition of electrons or a lowering in the oxidation number of a chemical or the atoms inside it is referred to as reduction.

Hence the answer will be electron

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The mole fraction of benzoic acid in the solution is 0.855.

What is benzoic acid?

Benzoic acid is a white solid which is a carboxylic acid based on benzene.

The vapor pressure of the benzoic acid solution and the mole fraction of the solute are directly proportional to each other i.e.

Pt = x P°s

Here t = total pressure

s = solvent

Given:

Vapor pressure of diethyl ether = 400.0 torr

Vapor pressure of the solution = 342 torr

Now substituting the values in the formula

342 =   x 400

= 342 / 400

 = 0.855

Thus, the mole fraction of benzoic acid is 0.855

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The true structure of a resonance hybrid is determined by the most stable resonance contributor. Equivalent resonance forms contribute equally to the overall structure of the resonance hybrid.

In a resonance hybrid, molecules or ions can have multiple resonance structures, which are different representations of electron distribution. These resonance structures are connected by double-headed arrows to indicate the delocalization of electrons. The true structure of a resonance hybrid is not any single resonance structure but a combination of all resonance contributors.

The stability of a resonance contributor depends on factors such as formal charges, electronegativity, and resonance energy. The most stable resonance contributor, also known as the major contributor, has the lowest energy and contributes the most to the overall structure of the resonance hybrid.

Equivalent resonance forms have the same energy and contribute equally to the resonance hybrid. They can be interconverted through resonance, where electrons are delocalized over multiple atoms. This delocalization of electrons enhances the stability of the system.

By considering the most stable resonance contributor and the equal contribution of equivalent resonance forms, we can determine the true structure of a resonance hybrid, which represents the actual electron distribution in the molecule or ion.

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Answer:

it doesn't make sense bro. how are they gonna form before atoms if they are made out of atoms? everything is

Explanation:

Under the influence of gravity, atoms came together and resulted in a blast causing the "big bang". So the statement is false as stars and planets are formed due to the colliding of atoms.

About 13.7 billion years ago, the universe underwent a dramatic expansion that caused space to expand like a huge balloon.

That sums up the Big Bang idea, which is accepted by almost all cosmologists and theoretical physicists. The theory is backed up by a lot of strong data. For instance, we are aware that the universe is still expanding right now, and that this expansion is speeding up.

According to the conventional Big Bang theory, the beginning of the universe involved a singularity, a region of infinite temperature and density whose nature is difficult for humans to comprehend. However, scholars assert that this may not truly reflect reality because the singularity idea is based on Einstein's theory of general relativity.

The origin of the cosmos is still mostly unknown. A trillionth of a second after the Big Bang, according to scientists, is where the tale may be picked up.

Therefore, the statement is false.

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A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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13-ethyl-3-methoxy-gona-2,5(10)-diene-17-one is a synthetic compound belonging to the family of selective androgen receptor modulators (SARMs). It is primarily used in the field of sports and bodybuilding as a performance-enhancing drug.

13-ethyl-3-methoxy-gona-2,5(10)-diene-17-one, commonly referred to as "13-ethyl," is a synthetic compound designed to selectively target and activate androgen receptors in the body. By binding to these receptors, it exerts anabolic effects, promoting muscle growth and enhancing athletic performance.

In sports and bodybuilding, athletes and fitness enthusiasts often seek ways to optimize their training and physical development. 13-ethyl has gained popularity in these circles due to its ability to enhance muscle mass, strength, and endurance. It stimulates protein synthesis, leading to increased muscle growth and improved recovery from intense workouts. Additionally, it can enhance bone density, aid in fat loss, and improve overall body composition.

However, it's important to note that the use of 13-ethyl and other SARMs is controversial and subject to regulation in various sports organizations and jurisdictions. They are often categorized as prohibited substances due to their potential for misuse and unfair advantage. Athletes should consult with medical professionals and adhere to anti-doping regulations before considering the use of such compounds.

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Answer:

Physical

Explanation:

Physical weathering is defined as the geological process in which rocks are broken down but there is no change in their chemical composition.

Granite tor are the rock masses above the ground surface which are  associated with granites

Granite Tor is an example of physical weathering as they formed by freeze–thaw weathering. Granite tor are formed when magma present in the crust cools down and form batholith. Rocks above batholith gets erodes and left the batholith to expose.

Hence, the correct answer is "Physical weathering'.

The acid mostly dissociates when dissolves in water.

option C.

A strong acid is an acid that is completely dissociated in an aqueous solution such as water when it is dissolved in it.  Strong acid is a chemical species with a high capacity to lose a proton, H+.

In other words, a strong acid is one which is virtually 100% ionized in solution.

Thus, when a compound is described as a strong acid it means that: the acid mostly dissociates when dissolves in water.

So option C is the correct answer as it explains the meaning of a strong acid.

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Let's find the masses of carbon and hydrogen from the masses of our products

for carbon:

\(23.98 g (CO_2) * \frac{12 g (C)}{44g (CO_2)}\)

mass of carbon = 6.54 gram

for hydrogen:

\(4.91 g (H_{2}O) * \frac{1 g (H)}{18 g (H_{2}O)}\)

mass of hydrogen = 0.27 gram

Total mass of carbon and hydrogen:

Mass of Carbon + Mass of Hydrogen = 6.54 + 0.27 = 6.81 gram

since we had a 10 gram sample, the rest of the mass must be because of Oxygen. so,

Mass of Oxygen:

Mass of compound  - Mass of carbon and hydrogen

10 - 6.81 = 3.19 gram Oxygen

Finding number of moles:

Moles of Carbon:

\(\displaystyle moles = \frac{given~mass}{molar~mass} = \frac{6.54~grams}{12~\frac{grams}{mole}} = 0.6~moles\)

Moles of Oxygen:

\(\displaystyle moles = \frac{given~mass}{molar~mass} = \frac{3.19~grams}{16~\frac{grams}{mole}} = 0.2~moles\)

Moles of Hydrogen:

\(\displaystyle moles = \frac{given~mass}{molar~mass} = \frac{0.27~grams}{1~\frac{grams}{mole}} = 0.3~moles\)

Empirical Formula:

Carbon : Hydrogen : Oxygen

0.6 : 0.3 : 0.2

6 : 3 : 2

C₆H₃O₂

The statement 2-Bromobutane reacts with sodium methoxide to give exclusively elimination products and no substitution is false.

2-Bromobutane can undergo both elimination and substitution reactions when reacted with sodium methoxide.

The outcome of the reaction depends on the reaction conditions such as temperature, solvent, and concentration.

In certain conditions, 2-Bromobutane can undergo an elimination reaction, resulting in the formation of an alkene, while in other conditions, it can undergo a substitution reaction, leading to the formation of an ether or an alcohol.

Therefore, it is incorrect to state that exclusively elimination products and no substitution products are formed in the reaction of 2-Bromobutane with sodium methoxide.

Thus, the given statement is false.

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Answer:

11. Redox

12. Acid/Base

13. Precipitation

14. Combustion

15. Precipitation