The first equation is an example of (fission / fusion) and the second is (fission /fusion)
In the first equation:
What does 91 stand for?
What does 56 stand for?
Justify why the second equation is balanced:​

Among the given options, the correct match between a group and its anatomical feature is: C) Diatoms → tests made of cellulose.

Diatoms are a type of algae belonging to the phylum Bacillariophyta. They are known for their intricate and delicate cell walls called tests or frustules. These tests are composed primarily of silica, making option A incorrect. Dinoflagellates (option B) are unicellular organisms that possess two flagella and do not have a holdfast. Phaeophyta, or brown algae (option D), have structures called blades that serve as their leaf-like photosynthetic organs. Hence, the correct match is diatoms having tests made of cellulose.

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The enthalpy change of the reaction -

CH₄ + 2O₂ = CO₂ + 2H₂O is -808kJ/mol.

Enthalpy is the measurement of energy in a thermodynamic system. The quantity of enthalpy equals to the total content of heat of a system, equivalent to the system’s internal energy plus the product of volume and pressure.

For a process taking place at constant pressure, the enthalpy change is equal to the heat absorbed or evolved. If the enthalpy change is positive, heat is absorbed and the reaction is endothermic. If the enthalpy change is negative, heat is evolved and the reaction is termed exothermic.

Given,

Enthalpy change = Sum of bond energies of reactants - sum of bond energies of products

= (4 × C-H) + (2 × O = O) - (2 × C = O) + (4 × O-H)

= [( 4 × 413 ) + ( 2 × 495 )] - [( 2 × 799 ) + ( 4 × 463 )]

= (1652 + 990) - (1598 + 1852)

= 2642 - 3450

= -808 kJ/ mol

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Answer:

1 atm

Explanation:

Given:

Atmospheric pressure = 760 torr

Find:

Atmospheric pressure in atm

Computation:

We know that ;

1 torr = 0.00131579atm

So,

760 torr = 760 x 0.00131579atm

760 torr = 1 atm (Approx)

Atmospheric pressure in atm = 1 atm

The diagram below has an atmospheric pressure of 760 torr. The

atmospheric pressure will be 1 atm.

This is calculated by converting Torr to atm which are both units of pressure.

The standard conversion formula is

1 torr = 0.00131579atm.

This means that

760 torr = 760 x 0.00131579atm

760 torr = 1 atm

Atmospheric pressure in atm is therefore 1 atm.

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Shearing stress is most likely to occur at this boundary. Therefore, option A is correct.

Shearing stress is defined as "a type of stress that acts coplanar with the material's cross-section." Shear stress is caused by shear forces. They are the same magnitude and opposite direction forces acting on opposite sides of a body. Shear stress is measured as a vector quantity.

A strike-slip fault is a dip-slip fault with a vertical dip in the fault plane caused by shear stresses. The San Andreas Fault in California is the world's most well-known strike-slip fault.

Thus, option A is correct.

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Your question is incomplete, most probably your question was

What type of stress is most likely to occur at this

boundary?

O shearing

syncline

tension

compression

Answer:helium or the noble gases

Explanation: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest ionizing energy

At pH 6, the predominant form of Ile will be the zwitterionic form.

At pH 6, we need to determine the predominant form of Ile (isoleucine) by comparing the pH to the pKa values of its functional groups. Ile has an amino group (NH2) with a pKa of 9 and a carboxylate group (COOH) with a pKa of 3.

At pH 6:

Based on this information, at pH 6, the predominant form of Ile will be the zwitterionic form, where the carboxylate group is negatively charged (COO-) and the amino group is positively charged (NH3+).

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Answer:

A. It is stable

Explanation:

Ed22

Stability is the  property that would xenon most likely to have. Therefore, the correct option is option A.

Chemically speaking, xenon is a gas with the atomic number 54 and the symbol Xe. It is a thick, colourless, and odourless noble gas that is present in minute levels in Earth's atmosphere. It may go through a few chemical reactions, such as the creation of xenon hexafluoroplatinate, which is the initial noble gas combination to be created, despite typically being unreactive.

Flash lamps, arc lamps, and general anaesthetics all employ xenon. The early laser designs utilised xenon flash lamps for pumps and a xenon monomer molecule (Xe2) for the lasing medium in the initial excimer laser design. Stability is the  property that would xenon most likely to have.

Therefore, the correct option is option A.

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Answer:

2 C4H10     +  13  O2    ====>   8  CO2      + 10 H2O

Explanation:

Answer:photosynthesis is a prosses of making food in plants.

The raw materials that are needed

are water carbondioxide,chlorophyl.

And the products are glucose for the plant and oxygen realesed to the atmosphere.

The saturated vapor pressure of methanol in the vessel is 125.9 mmHg (rounded off to 3 significant figures). The volume percent concentration of methanol in the vapor is 73.2% (rounded off to 3 significant figures).

a. Saturated vapor pressure of methanol in the vessel in mmHg: The vapor pressure of methanol (MeOH) in the vessel can be determined using Dalton's law of partial pressures. MetOH psat = MetOH Pabs

Here, MetOH Pabs is the pressure exerted by the vapor of methanol in the vessel. It is equal to the total pressure in the vessel minus the partial pressure of the inert gas (nitrogen). Pabs = 2 inch of water gauge = 2 x 25.4 mm of water gauge / 1 inch of water gauge = 50.8 mm of water gauge

Total pressure in mmHg = Pabs x 760 mmHg / 406.8 inch of water gauge = 94.8 mmHg

Partial pressure of nitrogen = 2 inch of water gauge = 50.8 mm of water gauge

Partial pressure of methanol = MetOH Pabs MetOH psat = 126 mmHg (at 25°C)

Therefore, the saturated vapor pressure of methanol in the vessel is 125.9 mmHg (rounded off to 3 significant figures).

b. Volume percent concentration of methanol in the vapor: The volume percent concentration of methanol in the vapor can be determined using the ideal gas law and the Dalton's law of partial pressures. V = nRT / PV = volume of the vapor (L)n = number of moles of methanol gas R = gas constant T = temperature (K)P = pressure (atm)

Let's assume that the total volume of the vapor in the vessel is 1 L and the temperature is 25°C (298 K).

The number of moles of nitrogen gas (N2) in the vapor can be determined using the Dalton's law of partial pressures. N2 Pabs = Pabs - MetOH PabsN2 Pabs = 50.8 mm of water gaugeN2 Pabs = 50.8 mm of water gauge x 1 atm / 760 mmHg = 0.067 atmN2 V = nRT / PN2N2 V = (0.067 atm x 1 L) / (0.082 L atm/K mol x 298 K)N2 V = 0.0022 mol

The number of moles of methanol gas (MeOH) in the vapor can be determined using the ideal gas law. MetOH Pabs = MetOH psatMetOH Pabs = 125.9 mm Hg MetOH Pabs = 125.9 mmHg x 1 atm / 760 mmHg = 0.165 atmMetOH V = nRT / PMetOH V = (0.165 atm x 1 L) / (0.082 L atm/K mol x 298 K)MetOH V = 0.006 mol

The volume percent concentration of methanol in the vapor can be determined using the following equation.

Volume percent concentration of MeOH = MetOH V / (N2 V + MetOH V) x 100%

Volume percent concentration of MeOH = 0.006 mol / (0.0022 mol + 0.006 mol) x 100%

Therefore, the volume percent concentration of methanol in the vapor is 73.2% (rounded off to 3 significant figures).

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Sаlts аre formed by replаcing hydrogen ions in аn аcid with metаl ions or аmmonium ions. In а sаlt, the аnion is either the conjugаte bаse of аn аcid or а bаsic аnion. Similаrly, the cаtion is either а metаl ion or аmmonium ion.

\(NaCH_{3}COO\): Sodium Аcetаte is а weаkly bаsic compound thаt hаs аn аnion with the formulа \(CH_{3}COO^{-}\). Sodium Аcetаte is а conjugаte bаse of the weаk аcid аcetic аcid (\(CH_{3}COO\)). So, in this cаse, the sаlt cаn be used to check the effect of аnions on the pH.

In order to observe the impаct of just cаtions on pH, the sаlt we would test is \(CuCl_{2}\). \(CuCl_{2}\) (Copper Chloride) is а sаlt thаt is composed of а metаl cаtion, Copper(II) ion, аnd а nonmetаl аnion, chloride ion. Аs а result, it cаn be used to test the effect of cаtions on pH.

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The mass of Na2SO4 that is needed to prepare a 350 ml solution having a sodium ion concentration of 0.125 M is 6.218 g.

Given: Volume of the solution = 350 mL = 0.350 LConcentration of sodium ion = 0.125 mWe have to find the mass of Na2SO4 required to prepare this solution.Let the mass of Na2SO4 be ‘m’.The molar mass of Na2SO4 = 142.04 g/molNumber of moles of sodium ions in the solution = 0.125 mMolarity = (Number of moles of solute) / (Volume of solution in liters)0.125 = (2 × number of moles of Na ions) / 0.350Lnumber of moles of Na ions = 0.125 × 0.350 / 2 = 0.021875 molSince 1 mol of Na2SO4 contains 2 moles of Na ions.

Number of moles of Na2SO4 = 0.021875 / 2 = 0.010938 molmass of Na2SO4 required = Number of moles of Na2SO4 × Molar mass of Na2SO4= 0.010938 × 142.04= 1.551 g ≈ 6.218 gSo, the mass of Na2SO4 that is needed to prepare a 350 ml solution having a sodium ion concentration of 0.125 M is 6.218 g.

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Answer:

we know, at STP ( standard temperature and pressure).

we know, volume of 1 mole of gas = 22.4L

weight of 1 Litre of hydrogen gas = 0.09g

so, weight of 22.4 litres of hydrogen gas = 22.4 × 0.09 = 2.016g ≈ 2g = molecular weight of hydrogen gas.

similarly,

weight of 2L of a gas = 2.88gm

so, weight of 22.4 L of the gas = 2.88 × 22.4/2 = 2.88 × 11.2 = 32.256g

hence, molecular weight of the gas = 32.256g

vapor density = molecular weight/2

= 32.256/2 = 16.128g

hence, vapor density of the gas is 16.128g.

Explanation:

C₆H₁₄ has the lower boiling point,  H₂O has higher heat of vaporization, Cha has higher evaporation rate and CH₃COOH has lower vapor pressure.  

The evaporation rate is the time required to evaporate a test solvent divided by the time required to evaporate a reference solvent under identical conditions. The results can be expressed as a percentage evaporated in a given time frame, the time required to evaporate a given amount, or a relative rate. The pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases in a closed system at a given temperature is defined as vapor pressure. The equilibrium vapor pressure indicates the thermodynamic tendency of a liquid to evaporate. It is concerned with the equilibrium of particles escaping from a liquid with those in a coexisting vapor phase. A volatile substance is one that has a high vapor pressure at room temperature.

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Complete Question

For each of the following pairs, predict which will have (1) the lower boiling point, (2) the higher heat of vaporization, (3) the higher evaporation rate, (4) the lower vapor pressure.

Pairs:  C₆H₅OH - C₆H₁₄, H₂O - H₂Se, CH₂OH - CHa, C₂H₆ - CH₃COOH.  

Explanation:

(a):their malleability:

>iron making. iron worker heat the meat and hammer it to give them the desired shape.

> in the jewelry making process, like the gold or silver you wear are results due to the malleability of metal

(b):their ductility:

>for the making of high tension cable that connects different cities for transferring of electricity.

>for making wire gauze

(c):their ability to conduct electricity:

>for lighting up your house with light bulbs

>for using cooking stoves

>to make refrigerator work.

Answer:

a)gold and silver-used to make jewellery

b)gold and copper(we draw them in wires easily because they are not brittle)

c)copper and iron(this is because both of them are metal and metaps are best conductors of electricity)

Explanation:

uses of copper- to make utensils

to make wires for circuits

uses of silver-to make jewellery

to make mirrors

malleability is the property of a meta in which the metal can be changed into different shapes.

Ductility-can be drawn into thin wires.

The change in ph when 9.00 ml of 0.100 m HCl(aq) is added to 100.0 ml of a buffer solution that is 0.100 m in NH₃(aq) and 0.100 m in NH₄Cl(aq) is 0.0784

the change in pH can be calculate as follows

Calculate initial pH

Kb = 1.8*10⁻⁵

pKb = - log (Kb)

= - log(1.8*10⁻⁵)

= 4.745

pOH = pKb + log {[conjugate acid]/[base]}

= 4.745+ log {0.1/0.1}

= 4.745

PH = 14 - pOH

= 14 - 4.7447

= 9.2553

Calculate pH after adding HCl

mol of HCl added = 0.1M *9.0 mL = 0.9 mmol

NH₃ will react with H⁺ to form NH₄⁺

Before Reaction:

mol of NH₃ = 0.1 M *100.0 mL

mol of NH₃ = 10 mmol

mol of  NH₄⁺ = 0.1 M *100.0 mL

mol of NH₄+ = 10 mmol

after reaction,

mol of NH₃ = mol present initially - mol added

mmol of NH₃ = (10 - 0.9) mmol

mol of NH₃ = 9.1 mmol

mol of NH₄+ = mol present initially + mol added

mol of NH₄+ = (10 + 0.9) mmol

mol of NH₄+ = 10.9 mmol

since volume is both in numerator and denominator, we can use mol instead of concentration

Kb = 1.8*10⁻⁵

pKb = - log (Kb)

= - log(1.8*10⁻⁵)

= 4.745

After the reaction, the following equation holds true:

mol of NH₃ = mol present initially - mol added

mol of NH₃ = (10 - 0.9)

mol of NH₃ = 9.1 mmol

mol of NH₄+ = mol present initially + mol added

mol of NH₄+= (10 + 0.9)

Since volume appears in both the numerator and denominator of the equation, we can use mol in place of concentration:

mmol of NH₄⁺ = 10.9 mmol

Kb = 1.8*10⁻⁵ pKb = -log(Kb) = -log(1.8*10⁻⁵) = 4.745

pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [10.9/9.1] = 4.823

pH = 14 - pOH = 14 - 4.8231 = 9.1769

The reaction between NH₄+ and OH⁻ will produce NH₃ when mol of NaOH supplied is 0.1M *9.0 mL = 0.9 mmol.

NH₃ = 0.1 M * 100.0 mL mol of NH₃ = 10 mmol NH₄+ = 0.1 M * 100.0 mL mol of NH₄⁺ = 10 mmol

After reaction, the equation is:

Mol of NH₃ = Mol originally present + Mol of NH₃ added = (10 + 0.9).

mol of NH₃ = 10.9 mmol

mol of NH₄⁺ = mol initially present - mol added

mol of NH₄⁺ = (10 - 0.9)

Since volume is in both the numerator and the denominator

mol of NH₄⁺ = 9.1 mmol,

we can substitute mol for concentration.

Kb = 1.8*10⁻⁵

pKb = -log(Kb) = -log(1.8*10⁻⁵) = 4.745

Make use of:

pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [9.1/10.9] = 4.666

occupy:

pH = 14 - pOH = 14 - 4.6663 = 9.3337

pH = final pH - initial pH

= 9.3337 - 9.2553

= 0.0784

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Answer: Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Explanation:

The specific heat of the metal, given the data from the question is 0.60 J/gºC

Data obtained from the question

The following data were obtained from the question:

   Mass of metal (M) = 74 g

   Temperature of metal (T) = 94 °C

   Mass of water (Mᵥᵥ) = 120 g

   Temperature of water (Tᵥᵥ) = 26.5 °C

   Equilibrium temperature (Tₑ) = 32 °C

   Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC

How to determine the specific heat capacity of the metal

The specific heat capacity of the sample of gold can be obtained as follow:

According to the law of conservation of energy, we have:

Heat loss = Heat gain

MC(T –Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)

74 × C(94 – 32) = 120 × 4.184 (32 – 26.5)

C × 4588 = 2761.44

Divide both side by 4588

C = 2761.44 / 4588

C = 0.60 J/gºC

Thus, the specific heat capacity of the metal is 0.60 J/gºC

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Fluorine(F)

Explanation:-

Lets look at Electronic configuration

\(\\ \sf\longmapsto 1s^22s^22p^3\)

The atomic number of an element represents the number of protons in the nucleus. In this case, the atomic number is 6. Therefore, there are 6 protons in the nucleus of this element. The correct answer is B. 6.

The atomic number of an element represents the number of protons in the nucleus. In this case, the atomic number is 6, which means there are 6 protons in the nucleus. The atomic mass is the sum of the number of protons and neutrons in the nucleus. Since the atomic mass is 12.01 and the atomic number is 6, we can subtract 6 from 12.01 to get the number of neutrons. This gives us a neutron count of approximately 6.01.

Therefore, The answer is B. 6 protons are in the nucleus of this element.

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Answer:- NaBr and Cl2 are reactants .

The atoms/molecules/ions on RHS of the reaction which react to give products are called reactants.

So here Sodium bromide and chlorine are the reactants.

Option A is the correct choice.

Additional information:-

Law of conservation of Mass :-

According to this law , the mass of reactants is equal to the mass of the products . Take a chemical reaction ,

C + O2 ==> CO2

Now suppose that if 12g of carbon reacts with 16g of oxygen to form carbon dioxide, then what will be the mass of carbon dioxide? So by law of conservation of Mass we can say that mass of carbon dioxide will be equal to mass of the reactants that will be 12g + 16g = 28g

With this I am leaving a sample problem for you to solve,

Question: Consider the following reaction .

2C + O2 ==> 2CO

If the mass of carbon taken is 24g and the amount of carbon monoxide formed is 56g , find the amount of oxygen used in the reaction.

Answer:D. Yields

Explanation:

1. The budgeted sales for July are $1,540,000.

To find the budgeted sales for July, we look at the given information. The budgeted unit sales for July are 22,000 units. The budgeted selling price per unit is $70.

To calculate the budgeted sales for July, we multiply the budgeted unit sales by the selling price per unit:

Budgeted sales for July = Budgeted unit sales for July * Selling price per unit

Budgeted sales for July = 22,000 units * $70

Budgeted sales for July = $1,540,000

2.  The expected cash collections for July are $616,000 (in the month of the sale) and $924,000 (in the following month).

To find the expected cash collections for July, we need to consider the information provided.

Forty percent of credit sales are collected in the month of the sale, and 60% are collected in the following month.

We know the budgeted sales for July is $1,540,000.

To calculate the expected cash collections for July, we need to determine the cash collected in the month of the sale and the cash collected in the following month.

Cash collected in the month of the sale

= 40% of budgeted sales for July

= 40/100 * $1,540,000

= $616,000

Cash collected in the following month = 60% of budgeted sales for July

= 60/100 * $1,540,000

= $924,000

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humus, topsoil, subsoil, parent rock

Answer:

either 1. organic, topsoil, subsoil, parent rock, bedrock or the opposite, 2. bedrock, parent rock, subsoil, topsoil, organic.

Explanation:

I study. :) Good luck!

The correct option is B, This is because aluminum is more reactive than hydrogen, so it will displace hydrogen from hydrochloric acid.

2Al(s) + 6HCl(aq) → \(2AlCl_3\)(aq) + \(3H_2\)(g)

Hydrochloric acid (HCl) is a strong, highly corrosive acid found naturally in the human stomach. In biology, it plays an essential role in the digestion of food by breaking down proteins and aiding in the absorption of nutrients. HCl is produced by the parietal cells in the stomach lining and is secreted into the stomach during the digestion process.

The acidic environment created by HCl in the stomach also helps to kill harmful microorganisms that may be present in food. Additionally, HCl stimulates the release of enzymes and hormones that further aid in digestion. While HCl is critical for digestion, too much or too little can lead to health problems. Excessive HCl production can cause acid reflux and stomach ulcers, while inadequate HCl production can result in the malabsorption of nutrients and an increased risk of infections.

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Explanation:

4Al+3C+H2O→4Al(OH)3+3CH4

Balanced reaction:- 4Al+3C+HH O→4Al(OH)3+3CH4

The values of δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25° are positive, negative, positive

What is entropy?

It is a measure of the unusable energy in a closed thermodynamic system that is also frequently regarded as a measure of the system's disorder, a characteristic of the system's state, and that varies inversely with the system's temperature and immediately with any reversible change in heat in the system.

a measure of the wasted energy in a closed thermodynamic system that is also frequently viewed as a measure of the system's disorder, a characteristic of the system's state, and that varies inversely with the system's temperature and instantly with any reversible change in heat in the system.

Because the system needs to be supplied with thermal energy, which comes from the environment, this phase change is endothermic. As a result, the environment's entropy must decrease (Ssurr must be negative).

According to the Second Law of Thermodynamics, the process is spontaneous because water does evaporate, which suggests that Suniverse > 0. This necessitates that the entropy rise of the liquid water be greater than the entropy decrease of the environment.

Therefore the values of δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25° are.positive, negative, positive

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Answer:

it has many layers

the inner core is solid

the core is iron

its very hot

the presusre increases as you move closer to the core

The R was found to be = 0.6711 L atm/mol.K

The percent error was found to be =18.22 %

The three elements that form magnesium a metal are as follows: It effectively conducts electricity. An electropositive element is magnesium. Magnesium has a relatively low ionization enthalpy.

In the crust of the planet, magnesium is the seventh most prevalent element. It is found in huge amounts as magnesite, dolomite, and other minerals but does not naturally occur uncombined.

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Answer:

HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)

Explanation:

Complete question

Dissolved hydrofluoric acid reacts with dissolved sodium hydroxide to form water and aqueous sodium fluoride. What is the net ionic equation

Equilibrium equation between the undissociated acid and the dissociated ions

HF(aq)⇌H+(aq)+F−(aq)

Sodium hydroxide will dissociate aqueous solution to produce sodium cations, Na+, and hydroxide anions, OH−

NaOH(aq)→Na+(aq)+OH−(aq)

Hydroxide anions and the hydrogen cations will neutralize each other to produce water.

H+(aq)+OH−(aq)→H2O(l)

On combining both the equation, we get –  

HF(aq)+Na+(aq)+OH−(aq)→Na+(aq)+F−(aq)+H2O(l)

The Final equation is  

HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)