Need help on this ASAP !!!!

Answer:

The unknown base concentration can be calculated from

Explanation:

An acid–base titration is a quantitative method of analysis for the determination of the concentration of an acid or base by neutralizing it with a standard solution (solution of known concentration) of base or acid.

At the equivalence point, when all unknown  base neutralized by standard acid solution

the following is applied  

No. of equivalent of acid = No. of equivalent of base

Cₐ * Vₐ = Cb * Vb

where,

Cₐ: is the concentration of standard acid solution  (known).

Vₐ: is the volume of acid that neutralizes the base (known).

Cb: is the unknown base concentration (unknown).

Vb: is the volume of base that neutralized with the acid (known).

So, the unknown base concentration can be calculated from

The concentration of base in a titration is calculated using the formula: concentration of base (M) = moles of acid / volume of base (L). This calculation is based on the stoichiometry of the neutralization reaction, typically in a one-to-one mole ratio, and is performed after achieving neutrality as indicated by an indicator or pH meter.

To calculate the concentration of base in a titration, a known volume and concentration of an acid are titrated against the base with an unknown concentration. The formula used for this calculation is concentration of base (M) = moles of acid / volume of base (L). This equation comes from the stoichiometry of the neutralization reaction, which for monoprotic acids and bases is typically a one-to-one mole ratio.

Using the stoichiometry of the neutralization reaction, which in a simple acid-base reaction like HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l), is 1:1, you can determine the moles of base that react with the moles of acid. The moles of acid are calculated by multiplying the concentration of the acid by the volume of acid (in liters). Once neutrality is achieved, indicated by a color change of the indicator or a specific reading on a pH meter, the volume of base used is noted. The moles of acid originally present in the solution are equal to the moles of base since they react in a 1:1 ratio. This allows the calculation of the base concentration using the titrant volume and the known concentration of the acid.

So you find the moles of the lead nitrate by doing mass/Mr so 25/331.2 which gives you 0.075

Due to stoichiometry in the reaction we see 1:2 ratio so we do 0.075x2 gives 0.15 moles of NaNO3

Then mass: moles x Mr so 0.15 x 85= 12.75g is your theoretical

So % yield is actual/ theoretical x 100

Therefore 6.0g/12.75 g x 100 = 47%

Not sure if it’s correct hope it helps!

Answer:

Option D = 0.2 Kj

Explanation:

Given data:

Mass of diethyl ether = 1.0 g

Hvap = 15.7 Kj / mol

Heat absorbed = ?

Solution:

Q = mass ×  Hvap /  molar mass

Q = 1.0 g × 15.7 Kj / mol / 74.12 g/mol

Q = 15.7 Kj / 74.12

Q =  0.212 KJ

Answer:

its A)

Explanation:

The conversion of kinetic energy to potential energy is neither exothermic nor endothermic, as it involves the transformation of energy forms within a system, not heat transfer to or from the environment. Option D is correct.

The conversion of kinetic energy to potential energy does not involve heat transfer but rather the transformation of one form of mechanical energy to another within a system. An exothermic process is one in which energy is released to the surroundings, usually in the form of heat, such as when a solid burns brightly, while an endothermic process absorbs energy from the surroundings.

For example, when two chemicals are mixed and their temperature drops, it is considered endothermic because the chemical system absorbed heat from the surroundings.

Hence, D. is the correct option.

Answer:

1) a. 2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).

2) a. 0.4477 mol.

b. 0.4477 mol.

c. 72.61 g.

Explanation:

1) Consider the following reaction:  iron (s) + chlorine (g) à iron (III) chloride

a. Write the balanced chemical equation.

So, the balanced chemical equation is:

2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).

It is clear that 2 mol of Fe(s) react with 3 mol of Cl₂(g) to produce 2 mol of FeCl₃(s).

2) 25.0 g of iron reacts with excess chlorine gas.  

a. Calculate the moles of iron reactant.

n = mass/molar mass = (25.0 g)/(55.845 g/mol) = 0.4477 mol.

b. Calculate the moles of iron (III) chloride.

Using cross multiplication:

2 mol of Fe produce → 2 mol of FeCl₃, from stichiometry.

∴ 0.4477 mol of Fe produce → 0.4477 mol of FeCl₃.

∴ The no. of moles of iron (III) chloride produced is 0.4477 mol.

c. Calculate the mass of iron (III) chloride.

mass of  iron (III) chloride = (no. of moles)*(molar mass) = (0.4477 mol)*(162.2 g/mol) = 72.61 g.

The balanced chemical equation for the reaction between iron and chlorine is 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s). A total of 0.448 moles of iron reacts with excess chlorine to produce 0.448 moles of iron (III) chloride, with a mass of 72.67 g.

The balanced chemical equation for the reaction between iron (s) and chlorine (g) to form iron (III) chloride (FeCl3) is: 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s).

To calculate the moles of iron reactant, use the molar mass of iron, which is 55.85 g/mol. Moles of iron = mass of iron ÷ molar mass of iron = 25.0 g ÷ 55.85 g/mol = 0.448 moles of iron.

The stoichiometry of the reaction shows that 1 mole of iron reacts with 1.5 moles of chlorine to produce 1 mole of iron (III) chloride. Therefore, the moles of iron (III) chloride produced from 0.448 moles of iron is also 0.448 moles.

To calculate the mass of iron (III) chloride produced, multiply the moles of iron (III) chloride by its molar mass (162.20 g/mol). Mass of iron (III) chloride = moles of iron (III) chloride × molar mass of iron (III) chloride = 0.448 moles × 162.20 g/mol = 72.67 g.

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The scale factor of a dilation is determined by comparing measurements of an original figure and its dilation. In the case of two-dimensional figures like circles, one common approach is to compare corresponding lengths or distances in both figures. In this case, without specific numerical measurements, we can't provide a concrete numerical value for the scale factor.

In order to find the scale factor of the dilation, it's important to understand what a dilation is first. In maths, when we are working with geometry, a dilation takes a figure and scales it larger or smaller. The scale factor is the measure by which the original figure is stretched or shrunk.

We calculate the scale factor by comparing the measurements of an original figure and its dilation. For two-dimensional figures, if we compare corresponding lengths in the pre-image and image, we can determine the scale factor. However, in this question, we aren't given specific numbers. If we assume the distance from A to B is r and from A to B' is r', the scale factor would then be r'/r.

In the special case of circles, a dilation centered at the center of the circle will create a similar circle with a scale factor equal to the ratio of their radii or, equivalently, to the square root of the ratio of their areas. If we had actual numeric values for those lengths or areas, we could provide a definite number for the scale factor.

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Answer:

1.429 g of  N₂

Explanation:

The Haber process is a reaction that combines nitrogen with hydrogen to form ammonia according to the following balanced equation:

One can note that 1 mol of N₂ react with H₂ to produce 2 mol of NH₃.

We cannot compare weight of a substance (in grams) to another in chemical reactions, but we can use moles, then we have to convert the weight of NH3 to moles.

no. of moles of NH₃ = (mass / molar mass) = (1.7 g / 17 g/mol) = 0.1 mol

and the actual yield is 98% , then the theoretical number of moles that would be produced are:  

98 = (0.1 mol /  theoretical yield) × 100

theoretical no. of moles of NH₃ = (0.1 * 100) /98 = 0.102 mol

using cross multiplication

1 mol of N₂ → 2 mol of NH₃.

?? mol of N₂ → 0.102 mol of NH₃.

no of moles of N₂ = [(1 mol * 0.102 mol) / 2 mol] = 0.051 mol

Last step is to convert the moles back to grams using:

mass = (no of moles of N₂  * molar mass of N₂)

         = (0.051 mol * 28 g/mol) = 1.429 g

Answer:

1. 0.6678 atm.

2. 181.9 mm Hg.

3. 379.8 K = 106.8°C.

4. 691.8 mm Hg.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(P₁T₂) = (P₂T₁)

Q1:

∵ (P₁T₂) = (P₂T₁)

P₁ = 0.5 atm, T₁ = 25°C + 273 = 298 K.  

P₂ = ??? atm, T₂ = 125°C + 273 = 398 K.

∴ P₂ = (P₁T₂)/(T₁) = (0.5 atm)(398 K)/(298 K) = 0.6678 atm.

Q2:

∵ (P₁T₂) = (P₂T₁)

P₁ = 47.0 mm Hg, T₁ = 77.0 K.  

P₂ = ??? mm Hg, T₂ = 25°C + 273 = 298 K.

∴ P₂ = (P₁T₂)/(T₁) = (47.0 mm Hg)(298 K)/(77 K) = 181.9 mm Hg.

Q3:

∵ (P₁T₂) = (P₂T₁)

P₁ = 248.0 kPa, T₁ = 0°C + 273 = 273 K. .  

P₂ = 345.0 kPa, T₂ = ??? K.

∴ T₂ = (P₂T₁)/(P₁) = (345.0 kPa)(273 K)/(248.0 kPa) = 379.8 K = 106.8°C.

Q4:

∵ (P₁T₂) = (P₂T₁)

P₁ = 745.0 mm Hg, T₁ = 22°C + 273 = 294 K. .  

P₂ = ??? mm Hg, T₂ = 0°C + 273 = 273 K.

∴ P₂ = (P₁T₂)/(T₁) = (745.0 mm Hg)(273 K)/(294 K) = 691.8 mm Hg.

B. The hole in the ozone layer got smaller

C. The hole in the ozone layer over Antarctica got bigger.

If you look at the Dobson unit scale the lighter the color over Antarctic the greater the ozone hole gets.

Answer:

covalent bond  

ionic bond

hydrogen bond

hope this helps enjoy

Explanation:

Final answer:

The elasticity seen in solids is due to the forces between atoms acting like springs that can be stretched or compressed but not easily broken. This allows solids to return to their original shape after the external forces causing deformation are removed.

Explanation:

Elasticity in solids is a result of the atoms in the material being in close contact and vibrating but not changing positions with neighboring atoms. The forces between the atoms act like springs that can be stretched or compressed but not easily broken. This resistance to deformation and ability to return to their original shape is what causes the elasticity seen in solids. For example, when a solid is stretched, the atomic springs are stretched, but when the force is removed, the springs bring the material back to its original shape.

Answer:

Explanation:

The equation tells you that for every mol of H2 you need 2 mols of Na to get it.

1 H2   /  4 mols H2  = 2  mols Na  /   x    Cross multiply

1*x = 4 * 2

x = 8 mol Na

Answer:

8 moles of sodium will react with water to produce 4.0 mol of  hydrogen in the reaction.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

Then

[tex]x=\frac{c*b}{a}[/tex]

In this case you can see that by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), they react and obtain:

But in this case 4 moles of hydrogen are produced. Then the rule of three applies as follows: If by stoichiometry 2 moles of sodium produce 1 mole of hydrogen, how many moles of sodium are needed to produce 4 moles of hydrogen?

[tex]moles of sodium=\frac{4molesofhydrogen*2molesofsodium}{1mole of hydrogen}[/tex]

moles of sodium=8

Then, 8 moles of sodium will react with water to produce 4.0 mol of  hydrogen in the reaction.

whats the question?????

Answer:

139.9 g ≅ 140.0 g.

Explanation:

where, P is the pressure of the gas in atm (P = 1.0 atm, standard P).

V is the volume of the gas in L (V = 98.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 273 K, standard T).

∴ n = PV/RT = (1.0 atm)((98.0 L)/(0.0821 L.atm/mol.K)(273 K) = 4.37 mol.

n = mass/molar mass.

∴ mass of O₂ = (n)*(molar mass) = (4.37 mol)(32.0 g/mol) = 139.9 g ≅ 140.0 g.

Answer: Ba(OH)2.5H20

Explanation:

The salt is a hygroscopic and contains 5 moles (penta) of water attached to it, hence the ".5H2O".

Yes, blue copper sulfate pentahydrate can be ground and used as a pigment for making paint. Copper sulfate pentahydrate is a compound that contains copper, sulfur, and oxygen. When ground into a fine powder, it can create a blue pigment that is commonly used in paint.

The reason why copper sulfate pentahydrate can be used as a pigment is because of its chemical properties. Copper sulfate pentahydrate has a vibrant blue color due to the presence of copper ions. These ions absorb certain wavelengths of light, reflecting only the blue color. When mixed with a binder, such as a resin or oil, the ground copper sulfate pentahydrate can be easily applied to a surface to create a blue hue.

However, it's important to note that copper sulfate pentahydrate can be toxic if ingested or inhaled, so precautions should be taken when handling and using it. It is always recommended to follow safety guidelines and use appropriate protective equipment when working with any potentially hazardous materials.

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Answer:

The mass of copper(II)sulfate are, 89.6 grams

Explanation:

Molecules of  =

Molar mass of  = 160 g/mole

First we have to calculate the moles of .

As,  number of atoms present in 1 mole of

So,  number of atoms present in  mole of

Now we have to calculate the mass of

Therefore, the mass of copper(II)sulfate are, 89.6 grams

Answer:

B. Cementation

Explanation:

The processes by which sediments are changed into rock are complex, but can be simplified into two processes, called compaction and cementation. Rounded sediment grains (ooliths) bound together with crystalline calcite.

Answer:

The correct answer is option B, that is, cementation.

Explanation:

The procedures by which the sediments are modified into rocks are composite, however, can be simplified into two procedures, known as cementation and compaction. In geology, cementation refers to welding and hardening of clastic sediments, that is, those produced from the preexisting fragments of rocks due to the precipitation of the mineral matter in the pore gaps. It is the ultimate phase in the production of sedimentary rock.

When temperature increases pressure also increases.

When temperature decreases pressure decreases.

That is why you have low tire pressure when it’s cold out

Temperature and Pressure have a direct relationship!

When Temperature increases ↑

Pressure increases ↑

When Temperature decreases ↓

Pressure decreases ↓

Answer:

is very large and it provides the needed temperature for another set of fusion

Explanation:

Nuclear fusion is the combination of two atomic nuclei into larger ones.

One of such is used in making hydrogen bonds.

In nuclei fusion,

²₁ H + ²₁ H → ⁴₂He + energy

This is an example of nuclear fusion.

The energy helps to further the fusion process and a chain reaction occurs and a massive amount of energy is released.

Answer:

Explanation:

Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Answer: Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.

Explanation: Kinetic Molecular Theory can be used to explain both Charles' and Boyle's Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Answer:

Electronegativity increases and metallic

properties decrease.

Explanation:

The statement which describes the general trends in electronegativity and metallic properties as the elements in Period 2 are considered in order of increasing atomic number are;

For electronegativity:

For metallic properties:

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Answer:

How will it affect the environment? Is its benefit worth the cost?

Explanation:

when creating environmental policies you should always look into if it is worth it or not and how it will affect the environment  

Answer:

It is A,B,C and D

Explanation:

I just took the test

The magnitude of the net force acting on an object is equal to the mass of the object multiplied by the acceleration of the object as shown in the formula below. If the net force acting on an object is zero, then the object is not accelerating and is in a state that we call equilibrium.

The net force in any direction on the box is the product of its mass and acceleration of box in direction of motion.

The force is the action of push or pull which makes an object to move or stop.

The net force acting on any object is the product of the mass of the object and the acceleration of the object

F = m x  a

If an object is moving with constant velocity, the net force acting on it is zero because the object will not be accelerating or in equilibrium state.

As, the acceleration is the vector quantity, the force is also a vector quantity. Thus, in the direction of force, the box will be accelerated.

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Answer:

2Na + I₂ → 2NaI. "Synthesis reaction"

Explanation:

2Na + I₂ → 2NaI.

It is a synthesis reaction that 2 reactants give 1 product.

That 2.0 mole of Na combined with 1.0 mole of I₂ to produce 2.0 moles of NaI.

The no. of all atoms is the same in both of reactants and products side.

Na (2), and I (2).

Answer:

15.9gmol⁻¹

The gas could have been methane when we compare the two molecular masses.

Oxygen gas, O₂ also shares this same number for its molecular mass. This would be the reason why it would not be methane.

Explanation:

Given parameters:

Volume of gas at STP = 2.0L or 2.0dm³(1L = dm³)

Mass  of the gas = 1.43g

Unknown:

Molecular mass of the gas = ?

Solution

We can find the number of moles using the mole concept according to the equation below:

          number of moles = ³⁻¹[tex]\frac{volume occupied(dm^{3} )}{22.4dm^{3}mol^{-1} }[/tex]

number of moles = [tex]\frac{2.0dm^{3} }{22.4dm^{3}mol^{-1}  }[/tex]

number of moles = 0.089mol

Using this obtained number of moles, we can derive the molecular mass of the compound by using the relationship between mass and number of moles according to the equation below:

                  molecular mass = [tex]\frac{mass}{number of moles}[/tex]

molecular mass = [tex]\frac{1.43}{0.089}[/tex]

molecular mass of the gas = 15.9gmol⁻¹

The formula of methane gas is CH₄.

Let's calculate the molecular mass of methane using these atomic masses:

C = 12g and H = 1g

The molecular mass = 12 + (1x4) = 16gmol⁻¹

The gas could have been methane when we compare the two molecular masses.

Oxygen gas, O₂ also shares this same number for its molecular mass. This would be the reason why it would not be methane.

Answer:

redox reaction

Explanation:

it's the only reaction occurs simultaneously, reduction and oxidation occur at the same time

Answer:

True

Explanation:

Soluble substances dissolve.

Therefore they wouldn't be called soluble if they can't dissolve in solvents

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Soluble substances can dissolve in certain solvents this statement is true.

Hence, the given statement is true.

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Answer:

Heating this gas to 55 °C will raise its volume to 6.87 liters.

Assumption: this gas is ideal.

Explanation:

By Charles's Law, under constant pressure the volume [tex]V[/tex] of an ideal gas is proportional to its absolute temperature [tex]T[/tex] (the one in degrees Kelvins.)

Alternatively, consider the ideal gas law:

[tex]\displaystyle V = \frac{n \cdot R}{P}\cdot T[/tex].

Therefore the volume of the gas is proportional to its absolute temperature.

Either way,

[tex]V\propto T[/tex].

[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1}[/tex].

For the gas in this question:

Convert the two temperatures to degrees Kelvins:

Apply Charles's Law:

[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 6.24\;L \times \frac{328.15\; K}{298.15\;K} = 6.87\;L[/tex].

The correct option is b. 6.87 L.

To solve this problem, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature in Kelvin at constant pressure. Mathematically, this can be expressed as:

 [tex]\[ \frac{V_1}{T_1} = \frac{V_2}{T_2} \][/tex]

 where [tex]\( V_1 \) and \( T_1 \)[/tex] are the initial volume and temperature of the gas, respectively, and [tex]\( V_2 \) and \( T_2 \)[/tex] are the final volume and temperature of the gas, respectively.

First, we need to convert the temperatures from Celsius to Kelvin:

[tex]\[ T_1 = 25.0^\circ C + 273.15 = 298.15 \text{ K} \][/tex]

[tex]\[ T_2 = 55.0^\circ C + 273.15 = 328.15 \text{ K} \][/tex]

Now we can rearrange Charles's Law to solve for the final volume [tex]\( V_2 \):[/tex]

[tex]\[ V_2 = V_1 \times \frac{T_2}{T_1} \][/tex]

 Substituting the given values:

[tex]\[ V_2 = 6.24 \text{ L} \times \frac{328.15 \text{ K}}{298.15 \text{ K}} \][/tex]

[tex]\[ V_2 = 6.24 \text{ L} \times \frac{328.15}{298.15} \][/tex]

[tex]\[ V_2 = 6.24 \text{ L} \times 1.1007 \][/tex]

[tex]\[ V_2 \approx 6.87 \text{ L} \][/tex]

 Therefore, the new volume of the gas after the temperature increase is approximately 6.87 L.

The transfer of energy by heat flow through a substance is accomplished by convection.

Answer:

The real answer is conduction.

Trust me on this one, it's correct. If you put the other answer, you will get it wrong. The answer is conduction, and I am 100% positive! :)

It’s TITRATION DJDKSKDKXKDKDKKD please name me brainest

Answer:

1.633L

Explanation:

P1 = 16.24psi

V1 = 0.700L

P2 = 6.961psi

V2 = ?

Using Boyle's law, P1V1 = P2V2

V2 = P1V1/P2

V2 = 16.24*0.7/6.961

V2 = 1.633L