Which statement accurately describes the reactants of a reaction? new substances that are present at the end of a reaction substances that are used up in a reaction substances that do not participate in a reaction new substances formed in the reaction

The correct answer is C. -0.76 V. the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

The correct answer is C. -0.76 V.

The standard reduction potential, denoted as E°, is a measure of the tendency of a species to gain electrons and undergo reduction in a redox reaction. It is expressed in volts (V) and represents the potential difference between the reduction half-reaction and the standard hydrogen electrode (SHE), which is assigned a potential of 0 V.

In the given half-reaction:

Mg2+(aq) + 2e- → Mg(s)

The species undergoing reduction is Mg2+(aq), and it is being reduced to Mg(s) by gaining 2 electrons.

To find the standard reduction potential for this half-reaction, we can refer to standard reduction potential tables. These tables provide a reference for various half-reactions with respect to the standard hydrogen electrode.

In the table, the standard reduction potential for the Mg2+(aq) + 2e- → Mg(s) half-reaction is listed as -0.76 V. This means that Mg2+ has a tendency to be reduced, and the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

Therefore, the correct answer is C. -0.76 V.

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The amount of excess NH4Cl remaining after the reaction is 55.7 g.

To find the amount of excess reagent in this reaction, we first need to write a balanced chemical equation for the reaction between aluminum nitrite (Al(NO3)2) and ammonium chloride (NH4Cl):

Al(NO3)2 + 6NH4Cl -> 2AlCl3 + 6NH3 + 6H2O

From this equation, we can see that for every 1 mole of Al(NO3)2, 6 moles of NH4Cl are required. We can determine the limiting reagent by finding the number of moles of each reactant and comparing them. The limiting reagent is the reactant that will run out first, meaning that the amount of product produced will be determined by the limiting reagent.

First, we'll find the number of moles of each reactant:

12.2 g Al(NO3)2 / 106 g/mol

= 0.115 mol Al(NO3)2

92.5 g NH4Cl / 53.5 g/mol

= 1.73 mol NH4Cl

Since 1.73 mol NH4Cl > 0.115 mol Al(NO3)2, we can say that

The amount of NH4Cl used in the reaction is 0.115 mol Al(NO3)2 * 6 mol NH4Cl/1 mol Al(NO3)2 = 0.69 mol NH4Cl.

The amount of excess NH4Cl is 1.73 mol - 0.69 mol = 1.04 mol.

Finally, we can convert the number of moles of excess NH4Cl to grams:

1.04 mol * 53.5 g/mol = 55.7 g.

So, the amount of excess NH4Cl remaining after the reaction is 55.7 g to one decimal place.

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Answer:

Ag+ (aq) + Cl- (aq) --> AgCl (s)

Explanation:

Answer:

number of neutrons= nucleon number - proton number

11-6=5

Answer:

If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. If the volume is held constant, the increased speed of the gas molecules results in more frequent and more forceful collisions with the walls of the container, therefore increasing the pressure

Explanation:

hope this helps

Answer:b

Explanation:

Answer: No solution

Explanation:

[5=5+(3)(x)]

x=3

[5=5+3.3]

[5=14]
[5=14] is false therefore the equation has no solution

The beaker with a 0.6 molar solution is hypertonic to the bag with a 0.2 molar solution.

When a cell is placed in a solution with a higher solute concentration, the solution is hypertonic to the cell. This means that there is a net movement of water from the cell into the solution, causing the cell to shrink or even collapse. In the context of the given scenario, the dialysis bag is filled with a 0.2 molar solution, and it is placed in four different beakers with solutions of different molarities.

The beaker with a 0.4 molar solution is isotonic to the dialysis bag, which means that the solute concentration is the same inside and outside the bag. Thus, there is no net movement of water into or out of the bag.

The beaker with a 0.2 molar solution is also isotonic to the bag. Therefore, there will be no net movement of water.

The beaker with a 1.0 molar solution is hypertonic to the dialysis bag. Thus, there is a net movement of water from inside the bag to the surrounding solution, causing the bag to shrink.

The beaker with a 0.6 molar solution is hypertonic to the bag. Therefore, there is a net movement of water from inside the bag to the surrounding solution, causing the bag to shrink.

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The incompressible assumption is valid for a flow when the Reynolds number is low (Re < 2300) for air and other gases. It is valid for water and other liquids when the Reynolds number is low (Re < 2000).

It is valid for glycerin and other oils when the Reynolds number is low (Re < 100).

Incompressible assumption

For a fluid flow to be considered incompressible, the change in density due to changes in pressure or temperature must be negligible. The fluid is considered to be incompressible if the density changes by less than 5% when the pressure or temperature is varied.

For air, the incompressible assumption is valid for flow velocities less than 2000 feet per minute (fpm) at 20 degrees Celsius. For other gases, the incompressible assumption is valid for velocities less than 100 fpm at the same temperature.

For water, the incompressible assumption is valid for flow velocities less than 3 feet per second (fps) at 20 degrees Celsius. For other liquids, the incompressible assumption is valid for velocities less than 1 fps at the same temperature.

For glycerin and other oils, the incompressible assumption is valid for flow velocities less than 0.2 fps at 20 degrees Celsius.

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The molecular formula of a compound is a whole number multiple of its empirical formula. The empirical formula of the hydrocarbon is C₄H₉.

The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.

Here moles of 'C' = moles 'CO₂' = 6.16 / 44 = 0.14 moles

Moles of 'H' = 2 × moles 'H₂O' = 2 × 2.84/18.02 = 0.315 moles

Divide both number of moles by 0.14. Then we get

1 mol 'C' and 2.25 mol 'H'

Multiply both with 4 to obtain a whole number.

Then the number of carbon is 4 and that of hydrogen is 9.

Thus the empirical formula is C₄H₉.

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the producers' surplus at a price of $14 and MC = $6 would be $8.

The first step is to find the quantity supplied at the given price of $14. Substituting p = 14 in the supply equation, we get:
14 = 10 + 2q
4 = 2q
q = 2
Therefore, at a price of $14, the quantity supplied is 2 units. To calculate the producers' surplus, we need to find the area between the supply curve and the price line, up to the quantity supplied. This is a right triangle with base 2 (the quantity) and height (p - MC), where MC is the marginal cost of producing one unit. The marginal cost is not given, so we cannot calculate the exact value of producers' surplus. However, we can say that it will be positive as long as the price is above the marginal cost. If we assume a marginal cost of $6, for example, then the height of the triangle would be 14 - 6 = 8. The area would be (1/2) x 2 x 8 = $8. Therefore, the producers' surplus at a price of $14 and MC = $6 would be $8.

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The total number of oxygen atoms on the right hand side of the reaction equation is eighteen.

We know that in a chemical reaction, we have the reactant side and the products side. The products side has to do with the substances that are combined so as to obtain the products of the reaction while the products are the substances that we get out of the reaction .

Now the question is trying to ask us to find out the number of the oxygen atoms that we can have at the right hand side of the reaction equation and this can be done if we carry out an atom count.

By carrying out an atom count, we can see that we have about eighteen atoms of oxygen that can be seen at the right hand side of this reaction equation.

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The quantity of heat gained by 50 g of iron is 112.5 Joules.

In Mathematics and Science, quantity of heat added to a physical substance can be calculated by using this mathematical equation (formula):

Q = mcθ

Where:

By substituting the given parameters into the formula, we have:

Q = mcθ

Q = 50 × 0.45 × (60 - 10)

Q = 50 × 0.45 × 50

Quantity of heat, Q = 112.5 Joules.

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Answer:

INTENSIVE PROPERTY OF MATTER

Explanation:

DENSITY IS AN INTENSIVE PROPERTY OF MATTER THAT ILLUSTRATES HOW MUCH MASS A SUBSTANCE HAS IN A GIVEN AMOUNT OF VALUE,

Answer:

B-they have different dimensions

Explanation:

It was explicitly stated in the question that the both samples are exactly pieces of the same metal. If that is so, pieces of the same metal must have the same density, contain the same quantity of matter, have the same boiling point and have the same amount of matter per unit volume.

However, the two pieces of metal may have different dimensions.

An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg

The volume of iceberg = 7670 cubic feet.

Density of ice = 0.917 g/cm\(^{3}\)

so, Density is given by,

Density = mass / volume

density of ice =  (0.917 /1000) kg/cm\(^{3}\)

1 cm\(^{3}\) = 0.00003531 ft\(^{3}\)

therefore,

0.000917 kg/cm\(^{3}\) = (0.000917 × 0.00003531 ) kg/ft\(^{3}\)

                            = 0.0000000324 kg/ft\(^{3}\)

now,putting the values in formula , we get,

Density = mass / volume

mass = density × volume

         = (0.0000000324 × 7670 ) kg

         = 0.0002483 kg

Hence,An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg.

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Here, 5.70 grams of hydrogen (H2) are produced from 50.7 g of aluminum (Al) in the reaction.

To find the grams of hydrogen (H2) produced from 50.7 g of aluminum (Al) in the reaction:

2Al  +  3H2SO4  →  3H2  +  Al2(SO4)3

First, find the molar mass of Al and H2:

Al: 26.98 g/mol

H2: 2.02 g/mol

Next, convert the given mass of Al (50.7 g) to moles:

50.7 g Al * (1 mol Al / 26.98 g Al) = 1.88 mol Al

Now, use the stoichiometry of the balanced equation to find the moles of H2 produced:

1.88 mol Al * (3 mol H2 / 2 mol Al) = 2.82 mol H2

Finally, convert the moles of H2 to grams:

2.82 mol H2 * (2.02 g H2 / 1 mol H2) = 5.70 g H2

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The molarity of aqueous potassium hydroxide (KOH) is 0.147 M.

The balanced chemical equation for the reaction between potassium hydroxide and phosphoric acid is:

3 KOH + H₃PO₄ → K₃PO₄ + 3 H₂O

From the balanced equation, we can see that three moles of potassium hydroxide react with one mole of phosphoric acid. Therefore, the number of moles of phosphoric acid used in the reaction is:

n(H₃PO₄) = M(H₃PO₄) x V(H₃PO₄) = 0.100 M x 25.0 mL x (1 L/1000 mL) = 0.00250 moles

Since three moles of potassium hydroxide react with one mole of phosphoric acid, the number of moles of potassium hydroxide used in the reaction is:

n(KOH) = (1/3) x n(H₃PO₄) = (1/3) x 0.00250 moles = 0.000833 moles

Finally, we can calculate the molarity of the aqueous potassium hydroxide:

M(KOH) = n(KOH) / V(KOH) = 0.000833 moles / 42.5 mL x (1 L/1000 mL) = 0.147 M

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A typical stoichiometric problem involves writing the balanced chemical equation, identifying the known and unknown quantities, using stoichiometry to convert the known quantities to the required units for the unknown quantity, and calculating the unknown quantity based on the stoichiometric coefficients.

A stoichiometric problem involves calculating the amount of reactants and products involved in a chemical reaction. To solve a typical stoichiometric problem, the following sequence of steps is generally required:
1. Write the balanced chemical equation for the reaction.
2. Identify the known quantities, which may be given in units of mass, moles, or volume.
3. Determine the unknown quantity that needs to be calculated.
4. Use stoichiometry to convert the known quantities to the required units for the unknown quantity.
5. Calculate the amount of the unknown quantity based on the stoichiometric coefficients in the balanced equation.
6. Check the answer for accuracy and consistency with the laws of conservation of mass and energy.
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There are 1.86 x 10²⁴ molecules of Silicon dioxide, SiO₂

The mole is the number of particles(molecules, atoms, ions) contained in a substance

Moles can also be determined from the amount of substance mass and its molar mass

1 mol = 6.02.10²³  particles

Can be formulated

\(\tt \boxed{\bold{N=n\times No}}\)

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

3.09 mol of Silicon dioxide, SiO₂

n=mol=3.09

\(\tt N=n\times No\\\\N=3.09\times 6.02\times 10^{23}\\\\N=\boxed{\bold{1.86\times 10^{24}~molecules}}}\)

Answer:

Hydrogen gas

Explanation:

During electrolysis of acidified water, H+ ions are reduced to H2 gas at the negative carbon electrode (cathode) and hence hydrogen gas is liberated at cathode.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 20 mL

density = 2 g/mL

The mass is

mass = 20 × 2

We have the final answer as

Hope this helps you

Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.

A balanced reaction is one where the reactants and products are present in equal amounts, and if the 100% reaction takes place, then the reactant sides have 1 mol of SbF₃ and 3 mol of CCl₄ that make the product of 1 mol of SbCl₃ and 3 mol of CClF₂. After the 100% reaction, all the reactants get converted into the product. The complete reaction is the below.

SbF₃ + 3CCl₄ → SbCl₃ + 3CClF₂

Hence, suppose  5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.

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Answer:

the answer is "Firm".

Explanation:

Answer:

Mass = 32.69 g

Explanation:

Given data:

Mass of copper = 32 g

Mass of zinc formed = ?

Solution:

Chemical equation:

Cu + Zn(NO₃)₂     →       Cu(NO₃)₂ + Zn

Number of moles of copper:

Number of moles = mass/molar mass

Number of moles = 32 g/ 63.55 g/mol

Number of moles = 0.5 mol

now we will compare the moles of zinc with copper.

           Cu          :           Zn

            1            :            1

          0.5          :         0.5

Mass of Zn:

Mass = number of moles × molar mass

Mass = 0.5 mol  × 65.38 g/mol

Mass = 32.69 g

Heat is required to convert fe2o3 into pure iron. Heat required to convert 514 g fe2o3 into pure iron in the presence of excess carbon for is 753.02kJ.

Heat is amount of energy that is transmitted because of a change in temperature from one structure to its surroundings. Heat is transition from one medium or object to another of kinetic energy, or from an energy source to a medium or object. This is amount of heat needed to increase the temperature by one degree Fahrenheit of a pound of pure liquid water.

Heat is source of energy that is transmitted (flowing from the high temperature system to the low temperature system) between systems or objects of different temperatures. It is also known as the thermal energy or heat energy. The heat is typically measured in Btu, calories or joules.

The Heat of Reaction (also known and Enthalpy of Reaction) is change in the enthalpy of a chemical reaction that occurs at a constant pressure. It is a thermodynamic unit of measurement useful for calculating amount of energy per mole either released or produced in a reaction. Since enthalpy is derived from the pressure, volume, and internal energy, all of which are state functions, enthalpy is also a state function.

2Fe2O3 (s) + 3C (s) ⇒ 4Fe (l) + 3CO2 (g)

ΔH°= +467.9kJ

Using the unitary method,

2 moles of Fe2O3 requires = 467.9kJ heat

2* 159.69g Fe2O3= 467.9kJ heat

319.38g Fe2O3 requires = 467.9 kJ heat

hence, heat required for for 514g of Fe2O3 = \(\frac{514}{319.38}*467.9kJ\)

heat required for 541g Fe2O3 = 753.02kJ

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Photochemical oxidants are produced in the troposphere, which is the lowest part of the Earth's atmosphere that extends from the Earth's surface up to about 10-15 kilometers in altitude (depending on location).

Photochemical oxidants are produced in the troposphere, which is the lowest part of the Earth's atmosphere that extends from the Earth's surface up to about 10-15 kilometers in altitude (depending on location). The troposphere is where most weather occurs and where most of the Earth's air mass is contained.

Photochemical oxidants are formed through complex chemical reactions involving sunlight, nitrogen oxides, and volatile organic compounds (VOCs) emitted by human activities and natural sources such as vegetation. These reactions produce a variety of chemical compounds, including ozone, nitrogen dioxide, and peroxyacetyl nitrate (PAN), which can have harmful effects on human health and the environment.

The ozone layer, which is located in the stratosphere, also contains ozone, but this ozone is formed through a different process and has a different function. The ozone layer helps to protect the Earth from harmful ultraviolet radiation from the sun.
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Answer:

50 years old

Explanation:

Antoine Lavoisier died by the guillotine at the age of 50 on May 8, 1794 in Paris.

Hope this helps...

- profparis

Answer:

Antoine Lavoisier died at the age of 50