A pH change can be evidence that

Correct statement in the process of balance the equation CH₄+O₂ → CO₂+2H₂O then add coefficient 2 to O₂ on the left side of the equation

Balance reaction is the chemical reaction in which number atom is arranged specific manner which reaction is balanced means all elements in the reaction are balanced with specific number

And the given reaction is

CH₄+O₂ → CO₂+2H₂O then,

Place a coefficient of 2 in front of the O₂ we now have 4O atoms on both sides CH₄+2O₂ → CO₂+2H₂O

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Answer:

See image below

Explanation:

To convert the left structure to the right structure, one pair of electrons on the oxygen is pushed down onto the carbon-oxygen bond (resulting in a double bond). This results in too many electrons on the top carbon. The electrons from the adjacent double bond are subsequently pushed onto the second carbon.

Density is the mass of a substance per unit volume. So, adding 9.628 ml of Ag to 51ml of H2O, makes the total volume 60.628ml.

Density is the mass of a substance per unit volume. The most commonly used symbol for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [tex]{\displaystyle \rho ={\frac {m}{V}}}[/tex] where ρ is density, m is mass and V is the volume.

Density is an important concept because it allows us to determine which substances  float and which sink when placed in a liquid. In general, substances float until their density is lower than the density of the liquid in which they are placed.

Density = Mass/ water displaced

water displaced = Mass/Density

water displaced = 101 / 10.49

water displaced = 9.628 cm³  

Here 1 cm³ = 1ml

so, adding 9.628 ml of Ag to 51ml of H2O, makes the total volume 60.628ml.

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Dissociate is the term which describes the dissolution of solutes in water.

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If you dissolved 54 grams of ammonia in 100 grams of water at 400°C then the solution is saturated

A saturated solution is a solution that has dissolved as much solute as it is capable of dissolving and in a saturated solution no more solute can be dissolved at a given temperature and we can make an saturated solution by keep on dissolving solute until no more solute can be dissolved

Here given data is dissolved 54 grams of ammonia in 100 grams of water at 400°C then the ammonia is totally dissolved in this 100 ml water

NH₃ + H₂O → NH₄OH

So, here ammonium hydroxide are formed which is saturated solution and when ammonia is dissolved in water the water molecule donate the proton to the NH₃ molecule and the solubility of ammonia decreases with the increases in of water solvent that's why when we dissolved  54 grams of ammonia in 100 grams of water at 400°C the solution is saturated

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Answer:

The law of Universal Gravitation.

The volume (in mL) of the 1.6 M NaHCO₃ solution that must be poured on the spill to react completely is 286 mL

We'll begin by writing the balanced equation for the reaction. This is given below:

H₂SO₄ + 2NaHCO₃ —> Na₂SO₄ + 2H₂O + 2CO₂

The volume of NaHCO₃ can be obtained as follow:

MaVa / MbVb = nA / nB

(2.6 × 88) / (1.6 × Vb) = 1  /2

228.8 / (1.6 × Vb) = 1 / 2

Cross multiply

1.6 × Vb = 228.8 × 2

1.6 × Vb = 457.6

Divide both side by 1.6

Vb = 457.6 / 1.6

Vb = 286 mL

Thus, the volume of the NaHCO₃ solution needed is 286 mL

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From the given equation of reaction:

Limiting reagents refers to the reactants in a given reaction which is completely used up at the end of a reaction.

Once the limiting reagent is used up, the reaction will stop.

Considering the given question and the data provided:

0.610 grams of hydrogen gas are allowed to react with 12.4 grams of ethylene (C₂H₄).

The equation of the reaction is as follows:

H₂ (g) + C₂H₄ (g) ---> C₂H₆ (g)

The mole ratio of the reactants is used to determine the limiting reactant.

Mole ratio of hydrogen to ethylene is 1 : 1

Moles of hydrogen = 0.610/2 = 0.305 moles

Moles of ethylene = 12.4/28 = 0.44 moles

The limiting reagent is hydrogen while the excess reagent is ethylene.

The maximum amount of ethane (C₂H₆ ) that can be formed is 0.305 moles.

mass of 0.305 moles of ethane = 0.305 * 30 grams

mass of 0.305 moles of ethane = 9.15 g

The moles of the excess reagent that remains after the reaction is complete = 0.44 - 0.305 = 0.135 moles

mass of 0.135 moles of ethylene = 0.135 * 28 = 3.78 grams

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The volume of HCl is needed to completely neutralize is 81.25 ml.

Formula of neutralization, M₁V₁ = M₂V₂

M₁ = concentration of HCl

V₁ = volume of HCl

M₂ = concentration of NaOH

V₂ = volume of NaOH

Put the value in M₁V₁ = M₂V₂

0.100 × V₁ = 25 × 0.325

V₁ =  25 × 0.325/ 0.100

V₁ = 81.25 ml

Hence, the volume of HCl is 81.25 ml.

In chemistry, neutralization or neutralization is a chemical reaction wherein acid and a base react quantitatively with every other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present inside the answer.

whilst a strong acid reacts with a strong base the ensuing salt is neither acidic nor primary in nature i.e. it's far impartial for instance whilst HCl, a strong acid, reacts with NaOH, a robust base, the resulting salt is sodium chloride and water.

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When an airplane is in flight, the air pressure at the under drops.

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is dispersed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

As air flows over an airplane wing, the form of the wing creates a low pressure over the wing surface. The low pressure creates lift, which allows the plane to fly.

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The reaction equation that is balanced is obtained as; [tex]P_{4} + 5O_{2} ----- > 2P_{2} O_{5}[/tex]

We know that it is common to use a chemicals reaction equation to show what is going on in a reaction system. The chemical reaction equation would include the symbols of the elements that are combined in the reaction equation.

The first rule that must be observed when we are writing a balanced reaction equation is that the number of atoms of each element on the reactant side must be the same as the number of atoms of the same element on the left hand side. This is what we call an atom count. If the atom count is not complete it then follows that the reaction equation is not balanced as written

Having said this let us now attempt to write the balanced reaction equation between phosphorus and oxygen molecules which are both poly atomic.

The balanced reaction equation is; [tex]P_{4} + 5O_{2} ----- > 2P_{2} O_{5}[/tex]

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Answer:

Explanation:

yyyyyyyyyyyy

Answer:

OsBr2.

Explanation:

Osmium decobromide is the same as osmium bromide. This is the result of the reaction between osmium hydroxide (Os(OH)2) and hydrobromic acid (HBr) to form water and a salt (osmium bromide):

So, osmium bromide has the formula: OsBr2.

Answer:

10.0 g C12H22O11 (mol/342.34 g) (1/0.500 L) = 0.06 M C12H22O11 => 1 sig.

Explanation:

According to molar concentration,0.00876 liter of 0.500 M sucrose contain 1.5 kg of sucrose.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Volume is obtained by using molar concentration formula, 0.500×342.3/1.5×10³=114.1×10[tex]^-3[/tex]=1/V

Thus,volume=1/114.1×10[tex]^-3[/tex]=0.00876 M.

Thus, the volume of sucrose solution is 0.00876 M.

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Answer: a physical change is something we can see, but a chemical change is not always something that we can see.

Explanation:  Physical changes show a change in appearance.

There are chemical changes when two aqueous solutions are added together and the product is still two aqueous solutions, so we would not see any change and no precipitate is formed.  

So a physical change is something we can see, but a chemical change is not always something that we can see.  

A buffer solution with a pH of 4.23 is prepared with the same volumes of 0.90 M HC₂H₂O₂ and O 1.2x10-9 M NaC₂H₂O₂ is 0.37.

A buffer answer is an aqueous answer along with an aggregate of a weak acid and its conjugate base, or vice versa. Its pH adjustments little or no when a small amount of sturdy acid or base is introduced to it.

Buffer solution is a water solvent based totally answer which includes a combination containing a vulnerable acid and the conjugate base of the vulnerable acid, or a vulnerable base and the conjugate acid of the vulnerable base. They withstand a trade-in pH upon dilution or upon the addition of small amounts of acid/alkali to them.

Buffer solutions resist an exchange in pH whilst small amounts of a robust acid or a strong base are added. a solution of acetic acid and sodium acetate CH3COOH + CH3COONa is an example of a buffer that includes a susceptible acid and its salt.

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Answer:

Determining the melting point of a substance.

2 HCl(aq) + Sr(OH)₂(aq) → SrCl₂(aq) + 2 H₂O(l).

Complete neutralization occurs when strong acids such as hydrochloric acid and HCl are mixed with strong bases such as sodium hydroxide and NaOH. Strong acids and strong bases decompose or completely dissociate into their constituent ions when dissolved in water. When a strong acid reacts with a strong base, the resulting salt is neither acidic nor basic.

Neutral. For example, when HCl hydrochloric acid a strong acid reacts with NaOH a strong base the resulting salts are sodium chloride and water. In a neutralization reaction, an acid reacts with an equimolar amount of base to form salt and water. An example would be the reaction between a strong acid and a base. The sodium chloride formed is the result of the neutralization reaction.

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Acid-base reactions are reversible and which ones are irreversible then the 1st reaction is HA + H₂O ↔ A⁻ + H₃O⁺ is the reversible reaction and in the 2nd reaction MOH → M⁺ + OH⁻ is the reversible reaction and 3rd reaction is HA+H₂O → A⁻ + H₃O⁺ is the irreversible reaction

Acid base reaction is the chemical reaction that occur when acid and base are mixed together called acid base reaction and irreversible reaction means they can occur only in one direction the reactants can change to the products but the products cannot change back to the reactants and reversible reaction means chemical reaction occur in both direction the reactants can change to the products and the products can also change back to the reactants and in that given reactions

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The negative sign indicators that the reaction is exothermic. the enthalpy change -2257.2 J.

Enthalpy, one of a thermodynamic system's attributes, is determined by multiplying the system's internal energy by the sum of its pressure and volume. The large surrounding environment conveniently offers this state function, which is commonly utilized in measurements of chemical, biological, and physical systems at constant pressure.

In order to calculate the system's physical dimensions, the pressure-volume term specifies the effort required to displace the system's surrounds and make room for it. The pressure-volume term is quite tiny for solids and liquids under ordinary conditions, but only fairly modest for gases. Enthalpy therefore acts as a substitute for energy in chemical systems.

The equation for the reaction is NaOH + HCl [tex]\rightarrow[/tex] NaCl + H₂O

Volume of the solution (100+100) ml = 200ml

Mass of solution = 200ml soln. x 1.00gm/1ml soln. (water density 1g/ml)

                           = 200ml

We, know the rule q=mcp∆t can be used to calculate the enthalpy change
Where q = enthalpy change
m = mass of solution
c = Specific heat of solution
∆t = Change in temperature

∴ m = 200gm soln.
c = 4.18J/g°C (water specific heat)
∆t = (27.2°C - 24.5°C)

∴ q=mcp∆t
= 200gm x 4.18J/g°C x (27.2°C - 24.5°C)
= 2257.2 J

We known that
q reaction = - q solution
                 = (c x m x ∆t) soltuion
∴ q reaction = -2257.2 J

Therefore, the correct answer is -2257.2 J

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Answer: gas mask

Explanation: A gas mask provides optimal protection from vapor and fumes.

The hill is 1.7 metres high (Approx.)

Knowing that;

Energy potential = 1000 J

Weight = 60 kg

mgh = potential energy

1,000 = [60][9.8][h]

h = 1.7 m

The whole amount of energy will be in the form of potential energy since the ball's kinetic energy will be equal to zero. As a result, when the ball reaches the peak of its climb, its potential energy will be 450 J. As a result, the ball will soar as high as 45.91 metres.

An enormous amount of potential or stored energy exists in a rock that is at rest on a hill. The boulder's potential energy transforms into kinetic energy, the energy of motion, when it falls.

The automobile drives faster as it goes down the hill, which results in an increase in kinetic energy and a decrease in potential energy.

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The smooth ER differs from the rough ER in that the smooth ER produces carbohydrates and lipids, whereas the rough ER produces proteins. (Option B)

The manufacture, folding, quality assurance, and shipment of some proteins take place in the rough ER, which is dotted with millions of membrane-bound ribosomes.

The production of steroid hormones, lipid (fat) synthesis, and metabolism are all heavily correlated with SER. It also serves as a detoxifier. The production of proteins is greatly aided by the rough endoplasmic reticulum.

The fundamental distinction between the rough endoplasmic reticulum and the smooth endoplasmic reticulum is that the RER contains ribosomes, which give it its rough appearance and enable protein synthesis.

Ribosomes cover the rough endoplasmic reticulum, which is important in the synthesis and creation of proteins.

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a. The mass of MgSO₄ that can be produced in the given reaction is 1.985 grams.

b. The percent yield of MgSO₄ is 10.68%

The complete balanced chemical equation is,

Na₂SO₄(aq)+MgCl₂(aq)⟶MgSO₄(s)+2NaCl(aq)

We know,

Molarity(M) = number of moles(n)/per litres solution.

So,

Number of moles of Na₂SO₄ = Molarity × volume.

Moles of Na₂SO₄ = 0.190×0.0871

Moles of Na₂SO₄ = 0.016549 moles.

Moles of MgCl₂ = 0.311×0.144

Moles of MgCl₂ = 0.044473 moles.

As we can see, moles of Na₂SO₄ are present in less amount,

So Na₂SO₄ will be Limiting reagent and it will control the reaction.

So,

Moles of Na₂SO₄ = Moles of MgSO4

Moles of MgSO₄ = 0.016549 moles.

As we know,

Moles = Mass produced/molar mass

Molar mass of MgSO₄ = 120grams/mole

Putting the values,

0.016549 = mass of Mg produced/120

Mass of MgSO₄ produced = 1.985 grams.

b. Percentage yield formula,

Percentage yield = experimental mass/theoretical mass×100

Theoretical mass = 1.985 grams

Experimental mass = 0.212 grams.

Percentage yield = 0.212/1.985×100

Percentage yield of MgSO₄ = 10.68%

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The five systems that helps us grow from a child to adult are excretory, integumentary, digestive, respiratory and cardiovascular system.

The body systems are the combination two or more systems located in the body that helps in the maintenance of hemostasis of the body.

Examples of body systems include the following:

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Display data associated with the ID such as age and other information.

Glassy unfocused eyes slow speech and movement or difficulty with small motor skills indicate a slow reaction. State ID cards, passports military ID cards, and driver's licenses are acceptable forms of ID in most states. Permanent Resident Cards may be accepted in some areas, but check with your administrator.

When a liquor store has carefully examined the identity of a customer before serving alcoholic beverages and reached a reasonable conclusion. Even if it turns out to be a fake ID and the appearance of the minor suggests the minor may be over the age of 21 or doing things she normally wouldn't. It is legally permissible even if it suggests that it is sexual. This can be a behavioral sign of addiction. Delayed reaction time Your body reacts and acts slower.

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The molal saturation of the moist entering air is 10.96 mol, molal saturation of the exiting air at 21 C is 0.560 mol and 187.2g of water condenses in the cooler.

The Antoine equation can be stated as a class of semi-empirical correlations describing the exact relation between vapor pressure and temperature for pure substances.

it is seen that

humidity = 44%

Ptotal = 1 atm = 760 mm Hg

[tex]P_{H2O}[/tex] = RH/100 X [tex]P^{*} _{H2O}[/tex] = 52/100 X 567.09

= 294.88 mmHg

Molal saturation = [tex]\frac{P_{H2O} }{P_{T} -P_{H2O} }[/tex]

= 294.88/ (760 - 294.88)

= 0.6361

Exit air = 100% (after cooling)

[tex]P_{H2O}[/tex] =  [tex]P^{*} _{H2O}[/tex] at 21°C = 18.65

Hm2 = 18.67/ (760 - 18.65)

= 0.025

Mole of water that enters = mole of total moist - mole of total dry

= 33.39 - 22.43

= 10.96

mole of water exits after cooling

n2 = Hm2 x (mole of dry air)

= 0.025 x 22.43

= 0.560

water condenses = n1 - n2

=10.96 - 0.560

=10.4 mol

=10.4 x 18 g

= 187.2 g

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