if 975 g of solution contains 0.077 kg of solute, what is the percent by mass concentration?

Answer:

0.908 atm

Explanation:

At standard temperature and pressure, the temperature of 0 Celsius and pressure which is equal to the atmosphere, 1 atm.

= 0 Celsius

= 1 atm

Change in temperature causes a change in the pressure:  

   =248K

        =?

Calculating the pressure,   using Gay-Lusaac's law:  

Convert the temperatures from Celsius to Kelvin:

=0 Celsius+273=273K

  =248K

To find  :

 = = 0.908 atm

The volume of the water vapor that we have is obtained as 149 L.

We know that there can be a conversion of matter from one state to the other. There are three states of matter that we know and these are the solid, the liquid and the gaseous states of matter.

We have to note that when we boil water, we have to supply energy to the molecules of the water such that the bonds that are holding the particles of the water can be able to break and then the water vapor would now escape.

We have that;

Number of moles of water = 120 g/ 18 g/mol

= 6.67 moles

If 1 mole of water vapor would have a volume of 22.4 L

6.67 moles of water vapor would have a volume of

6.67 * 22.4/1

= 149 L

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Answer:

peroxide such as hydrogen peroxide In peroxide, oxygen has an oxidation number of -1. when oxygen is combined with fluorine it's oxydation number is +2

Explanation:

hope the picture above helps u to understand:)

Molecular geometry refers to how atoms are arranged within a molecule, typically in relation to a single center atom. Because the nitrogen is sp3 hybridized, it possesses four sp3 hybrid orbitals.

By taking into account both lone pairs and bond pairs, electron pair geometry can forecast the form of a molecule. By merely taking into account bond pairs, molecular geometry may predict the form of a molecule.

The nitrogen atom likewise hybridizes in the sp2 configuration, but unlike the carbon atom, it has a "lone pair" of remaining electrons that are not involved in the bonding. As a result, the geometry of nitrogen with three bonded ligands is trigonal pyramidal.

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Answer:

El agua oxigenada se encuentra en cuatro concentraciones diferentes expresadas “en tanto por ciento”: 8%, 30%, 35% y 50%. Sin embargo, hay quien prefiere hablar de “volúmenes” y no de “porcentajes”.

The polarity of a covalent bond is determined by the electronegativity of the atoms involved.

Electronegativity is the measure of an atom's ability to attract electrons. Atoms with higher electronegativity will pull more strongly on the shared electrons, resulting in a bond that is polar. The atom with the higher electronegativity will have a slight negative charge, while the atom with the lower electronegativity will have a slight positive charge.

The polarity of the bond will increase as the difference in electronegativity increases. For example, if a carbon atom is bonded with a chlorine atom, the chlorine atom has a higher electronegativity and the bond will be more polar than a bond between two hydrogen atoms. The amount of polarity in a bond will depend on the difference in the electronegativities of the two atoms.

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Answer:

4:2 (2:1 simplified)

Explanation:

Check the coefficients!

Answer:

Tha nolar mass of aluminium is 26.98 g/mol; the molar mass of (atomic) oxygen is 16.90 g/mol.

Explanation:

1 mol of Al2O3 therefore has a mass of 2(26.98)+3(16.00)=101.96 g.

Divide this into the given mass, to find the number of moles here:

(204 g)/(101.96 g/mol)=2.001 mol

There are 2 moles of aluminium per mole of aluminium oxide, so there are 2(2.001)=4.002 moles of aluminium in the sample.

Then there are (4.002 mol)(26.98 g/mol)=107.97 g of Al. Since the given mass has only 3 significant figures, round this answer o 108 g.

Answer:

It is disproved that atoms are indivisible.  Which is answer choice B.

Explanation:

I got it right on Edge. :)

We have that this means that It disproved that atoms are indivisible

Option C

From the question we are told

Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?

Generally

Dalton defined an atom as the smallest particle of an element

This was disapproved of by J.J. Thomson's experiment

Therefore

This means that It disproved that atoms are indivisible

Option C

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If 37.5 ml of 0.100 m NaOH is added to 10.0 ml of 0.100 m, \(CH_3COOH\), the pH of the resulting solution after mixing 37.5 mL of 0.100 M NaOH with 10.0 mL of 0.100 M  \(CH_3COOH\) is approximately 12.76.

We must evaluate the reaction that occurs between NaOH and  \(CH_3COOH\) to get the pH of the resultant solution. The interaction of  \(CH_3COOH\) and OH- produces CH3COO-, a weak basic, and water (H2O).

Moles of \(CH_3COOH\) = volume (in L) × concentration

Moles of  \(CH_3COOH\)  = 0.100 × 10.0

Moles of  \(CH_3COOH\)  = 1.0 mol

Moles of NaOH = volume (in L) × concentration

Moles of NaOH = 0.100 × 37.5 mol/L

Moles of NaOH = 3.75 mols

Now,

\(\rm NaOH_{self}=\frac{0.100\times37.5-0.100\times10.0}{37.5+10}\)

= 0.579M

So,

OH⁻ = NaOH = 0.579M

pOH = -log[\(OH^-\)]

pOH = -log[0.579M]

pOH ≈ 1.24

pH = 14 - pOH

pH = 14 - 1.24

pH ≈ 12.76

Therefore, the pH of the resulting solution after adding 37.5 mL of 0.100 M NaOH to 10.0 mL of 0.100 M \(CH_3COOH\) is approximately 12.76.

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The IR spectrum of Acetylferrocene will differ from that of Ferrocene because of the carbonyl stretching and bending modes that appear in the Acetylferrocene.

The IR spectrum of Acetylferrocene will differ from that of Ferrocene due to the carbonyl stretching and bending modes that appear in the Acetylferrocene.

Ferrocene and Acetylferrocene have similar IR spectra since they both have the Fe-Cp stretching and bending modes. The acetyl group of Acetylferrocene is reflected by an intense band in the 1700-1750 cm-1 range, which is due to carbonyl stretching.

                                     In Acetylferrocene, the IR spectra are dominated by the presence of the acetyl group's vibration, resulting in a change in the frequency of stretching vibration from 200 to 220 cm−1. Another change in the IR spectra of Acetylferrocene is the presence of two bands due to C-O stretching at 1230-1260 cm-1 in addition to the appearance of a strong band due to C-H bending vibrations in the 1410-1450 cm-1 region.

                           Ferrocene does not have a carbonyl group, which is why it will not display the carbonyl stretching and bending vibrations in the IR spectra. This is the most significant difference between the two IR spectra. So, we can conclude that the IR spectrum of Acetylferrocene will differ from that of Ferrocene due to the presence of the carbonyl group.

Therefore,  The IR spectrum of Acetylferrocene will differ from that of Ferrocene because of the carbonyl stretching and bending modes that appear in the Acetylferrocene.

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Answer:

Here's what I get  

Explanation:

Sublimation is the conversion of a solid directly to a gas, without passing through the liquid state.

It occurs when the molecules of a solid have absorbed enough heat (kinetic energy) for some molecules to overcome the attractive forces of their neighbours and escape directly into the vapor phase.

One substance that sublimes at room temperature and pressure is CO₂ (dry ice).

Naphthalene is a substance that sublimes at room temperature and pressure.

Sublimation is defined as a process in which solid converts into gas directly without converting into liquid.

In the sublimation process, the reaction is an endothermic reaction, as the chemical bonds between molecules are broken down in order to release them into the air. Therefore ,the energy is released and so it is an endothermic reaction.

The heat or energy required to change the state from solid to gas is called the enthalpy of sublimation .Generally, it is expressed as KJ/m o l. Sublimation only occurs at pressures and temperatures .

Hence , Naphthalene is a substance that sublimes at room temperature and pressure.

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Answer:

gas production

Explanation:

Answer:

gas formation

Explanation:

frothy bubbles produced by carbon dioxide gas are a sign that a chemical reaction has occurred when a based is mix with acid.

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer: number one makes the most sense to me let me know if it’s right!

Explanation:

Answer: It is all of them. I just did the quiz. I just use 3 answers but it turned out to be all of them

Explanation:

Answer:

The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.

B) Surfactant is a phospholipid molecule that prevents alveoli from collapsing. It reduces surface tension in the lungs, allowing the alveoli to remain open and facilitating efficient breathing.

Phospholipid molecules that prevent the alveoli from collapsing are known as surfactants. Surfactant is a substance composed of phospholipids, proteins, and other components. It is produced by specialized cells in the lungs called type II alveolar cells.

The primary function of surfactant is to reduce the surface tension within the alveoli, which are tiny air sacs in the lungs where gas exchange takes place. Without surfactant, the surface tension would be too high, causing the alveoli to collapse during exhalation. Surfactant molecules disrupt the cohesive forces between water molecules on the alveolar surface, allowing the alveoli to remain open and preventing them from sticking together. The presence of surfactant is crucial for efficient breathing and maintaining lung function. In conditions where surfactant production is reduced or absent, such as in premature infants or certain lung diseases, respiratory distress syndrome and other breathing difficulties can occur.

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The oxidation number of an element in a compound changes when the compound undergoes oxidation or reduction.

In oxidation, the oxidation number of the element increases, meaning it loses electrons. This happens because the compound loses electrons to another substance. In reduction, the oxidation number of the element decreases, meaning it gains electrons. This happens because the compound gains electrons from another substance. Therefore, the change in the oxidation number of an element in a compound indicates whether the compound is being oxidized or reduced.
When a compound is oxidized, the oxidation number of one of its elements increases, meaning it loses electrons during the reaction. On the other hand, when a compound is reduced, the oxidation number of one of its elements decreases, indicating that it gains electrons during the reaction. In summary, oxidation involves an increase in the oxidation number due to electron loss, while reduction involves a decrease in the oxidation number due to electron gain. These processes often occur simultaneously in redox reactions, where one species is oxidized and another is reduced.

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The shortest covalent bond is the H-F bond. Therefore, option (A) is correct.

The electronegativity decreases down the group and the Fluorine is the most electronegative atom in the periodic table. The size of the atoms also increases as we go down the group.

The bond length of the hydrogen halides will follow the order HF < HCl < HBr < HI. The radius of the Iodine atom is the largest and to form a molecule, the hydrogen atom will be farthest as compared to all hydrogen halides.

The molecule with Fluorine will have the shortest bond length because its atom has the smallest size, making them attach very closely. So the covalent bond of hydrogen fluoride will be the shortest.

The relationship between bond length and bond strength is inverse in nature. The bond length of HI is the greatest, it will have the least bond strength. So the order for bond strength of the hydrogen halides is  HF > HCl > HBr > HI.

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Measure the temperature of the oil when it starts to smoke after adding some olive oil to a pan and heating it over a flame. Repeat with the remaining three oils.

The temperature at which oil begins to smoke and stop shimmering is known as the smoke point. The smoke point, also known as the oil burning point, can range from a very low 325 F to a very high temperature (520 F). Because unsaturated fats have a lower smoke point, they are favored for higher temperature tolerance.

According to some sources, olive oil has a smoke point of 374–405°F (19–207°C) (17). It is thus a secure option for the majority of cooking techniques, including the majority of pan frying. The smoke point of  olive oil ranges from 374 to 405 °F (190-207 °C). It is therefore a good option for the majority of culinary techniques.

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Answer: it’s the bottom 2

Explanation: I just took the test and was able to see the answer. :)

Answer:

Chemistry makes no sense. See below for answer.

Explanation:

The enthalpy of decomposition of 2 mol of H2O2(l) is -428 kJ/mol. Among the given options, none of them match the calculated enthalpy.

The enthalpy of decomposition of 2 mol of H2O2(l) can be determined using the given bond enthalpies and the balanced equation.

The balanced equation for the decomposition of hydrogen peroxide (H2O2) is:

2 H2O2(l) → 2 H2O(g) + O2(g)

To calculate the enthalpy of decomposition, we need to consider the bonds broken and formed during the reaction and their corresponding bond enthalpies. The enthalpy change (ΔH) can be calculated using the following equation:

ΔH = Σ(ΔH(bonds broken)) - Σ(ΔH(bonds formed))

From the given table of bond enthalpies, we can determine the bond enthalpies involved in the reaction:

ΔH(bonds broken) = 2 * ΔH(H-O) + ΔH(O-O)

ΔH(bonds formed) = 4 * ΔH(O-H)

Substituting the values from the table into the equation and calculating:

ΔH = 2 * (464 kJ/mol) + (496 kJ/mol) - 4 * (463 kJ/mol)

= 928 kJ/mol + 496 kJ/mol - 1852 kJ/mol

= -428 kJ/mol

The negative sign indicates that the reaction is exothermic, releasing heat. Therefore, the enthalpy of decomposition of 2 mol of H2O2(l) is -428 kJ/mol.

Among the given options, none of them match the calculated enthalpy.

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Without the given bond enthalpy values, an exact answer can't be provided. The enthalpy of decomposition could be negative if decomposition releases heat, or positive if it absorbs heat.

The problem is asking for the enthalpy of decomposition of 2 mol of H2O2(l). The enthalpy of decomposition can be calculated using the Bond Enthalpy values given in the table. If the table is not given, we would have to use the given options to guess the most probable answer.

We can't provide an exact answer without the necessary bond enthalpy values. However, we can clarify that the enthalpy of decomposition should be a negative value if the process is exothermic (releasing heat) and positive if it is endothermic (absorbing heat).

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Answer:

the charge of an element is equal to the number of orotons minus the number of electrons. the number if proton is equal to the number of elements given in the periodic table. the number of electrons is equal to the atomic numver minus the CHARGE of the atom

Answer:

B. Good luck

Explanation:

The convection currents in Earth’s mantle transfer thermal energy away from Earth’s core toward its crust. Therefore, option B is correct.

Convection is a single- or multiphase fluid movement that develops on its own as a result of the interaction between a fluid's body forces—most frequently gravity and density—and material property heterogeneity.

Convection currents are created by the difference in densities of a specific fluid that is produced as a result of temperature gradients. This implies that the circulation of fluids frequently depends on convection currents. These currents aid in the movement of a specific fluid, such as water, air.

Both the Earth's outer core and mantle experience convection currents. The asthenosphere is where these currents often form, and from there, they push the magma upward.

Thus, option B is correct.

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The value of the Ksp for the bismuth sulphide (Bi₂S₃) and which has the solubility of 1.0 × 10⁻¹⁵ mol/L at 25 °C is 1.1 × 10⁷³.

The chemical equation is :

Bi₂S₃   ⇄  2Bi³⁺   +  3S²⁻

The expression for the ksp is as follows :

ksp = [Bi³⁺]² [S²⁻]³

The solubility = 1.0 × 10⁻¹⁵ mol/L

[Bi³⁺] = 2 ( 1.0 × 10⁻¹⁵ ) = 2 × 10⁻¹⁵

[S²⁻] = 3 ( 1.0 × 10⁻¹⁵ ) = 3 × 10⁻¹⁵

ksp = (2 × 10⁻¹⁵ )² ( 3 × 10⁻¹⁵ )³

ksp = 1.1 × 10⁷³

Thus, the ksp for the Bi₂S₃   is  1.1 × 10⁷³.

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The sentence that shows humans' main problem is "The level of carbon dioxide in Earth's atmosphere has risen consistently for decades, trapping extra heat near the surface of the Earth," which is the last option.

The sentence that shows humans' main problem is "The level of carbon dioxide in Earth's atmosphere has risen consistently for decades, trapping extra heat near the surface of the Earth." This sentence indicates that the main problem is the increasing levels of carbon dioxide in the Earth's atmosphere caused by human activities. This increase in carbon dioxide is resulting in global warming, where heat is being trapped near the Earth's surface, leading to several negative effects, including rising sea levels, changes in weather patterns, and loss of biodiversity.

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⁹⁴Pu₂₄₄-------> ⁹⁵Am₂₄₃ + electron is a nuclear equation for plutonium emitting gamma radiation

Alpha particles plutonium is created in an activator when uranium atoms absorb neutrons. Nearly all plutonium is man-made. Plutonium mainly emits alpha particle is a type of radiation that is easily ceased and has a short range. It also emits neutrons, beta particles, and gamma rays. It also emits neutrons, beta particles, and gamma rays.

It is contemplated toxic, in part, because if it were to be inhaled it could deposit in the lungs and finally cause damage. There are five common isotopes of plutonium because it emits alpha particles, plutonium is most menacing when inhaled.

So we can conclude that Plutonium isotopes emit alpha rays except for plutonium-241 for which the energy of beta electrons is curiously low.

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The total weight of dextrose is 250 grams.

The total weight of Aminosyn is 42.5 grams.

10 mL of KCI should be added.

5 mL of NaCl should be added.

The total volume of the solution with the original fluids and the addition of KCI and NaCl is 1315 mL.

To calculate the total weight of dextrose, we need to know the concentration of the 50% dextrose solution. Assuming the concentration refers to weight/volume (w/v), we can calculate the weight using the formula:

Weight of dextrose = (Concentration of dextrose * Volume of dextrose solution) / 100

Weight of dextrose = (50 * 500) / 100

Weight of dextrose = 250 g

Therefore, the total weight of dextrose is 250 grams.

To calculate the total weight of Aminosyn, we need to know the concentration of the 8.5% Aminosyn solution. Assuming the concentration refers to weight/volume (w/v), we can calculate the weight using the same formula as above:

Weight of Aminosyn = (Concentration of Aminosyn * Volume of Aminosyn solution) / 100

Weight of Aminosyn = (8.5 * 500) / 100

Weight of Aminosyn = 42.5 g

Therefore, the total weight of Aminosyn is 42.5 grams.

To calculate the volume of KCI to be added, we need to know the strength of the stock KCI solution. Assuming the stock KCI solution is 2 mEq/mL, we can calculate the volume of KCI using the formula:

Volume of KCI = (Amount of KCI needed) / (Strength of KCI solution)

Volume of KCI = 20 mEq / 2 mEq/mL

Volume of KCI = 10 mL

Therefore, 10 mL of KCI should be added.

To calculate the volume of NaCl to be added, we need to know the strength of the stock NaCl solution. Assuming the stock NaCl solution is 4.4 mEq/mL, we can calculate the volume of NaCl using the formula:

Volume of NaCl = (Amount of NaCl needed) / (Strength of NaCl solution)

Volume of NaCl = 22 mEq / 4.4 mEq/mL

Volume of NaCl = 5 mL

Therefore, 5 mL of NaCl should be added.

The total volume of the solution with the original fluids and the addition of KCI and NaCl can be calculated by adding the volumes of all the components:

Total volume = Volume of dextrose solution + Volume of Aminosyn solution + Volume of sterile water + Volume of KCI + Volume of NaCl

Total volume = 500 mL + 500 mL + 300 mL + 10 mL + 5 mL

Total volume = 1315 mL

Therefore, the total volume of the solution is 1315 mL.

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The classification of the alcohols gives;

Organic compounds occurs in families. The family of compounds is called a homologous series. The homologous series always have a functional group. The functional group is the atom, group of atoms or bond that is responsible for the chemical reactivity of the members of a given homologous series.

Now we know that the alcohols are those organic compounds that contains the -OH group. The could be aliphatic or alicyclic compounds. We shall now proceed to name the kind of alcohols that each of the compounds shown are;

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