In the image above you see an 8mL graduated cylinder or
the left and an excerpt of a burette on the right. Each
holds a fixed volume of liquid. What are the volume
readings in each of these pieces of glassware? Give your
readings to 2 decimal places.
The volume in the graduated cylinder is
mL
The volume in the burette is
mL.

Taking into account the definition of molarity, the concentration of the NaCl solution is 0.576 moles/L.

Molarity is a measure of the concentration of a solute that indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles of solute÷ volume

Molarity is expressed in units moles/ L.

In this case, you know that:

Replacing in the definition of molarity:

molarity= 0.144 moles÷ 0.250 L

Solving:

molarity= 0.576 moles/L

Finally, the molarity in this case is 0.576 moles/L.

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The complete balanced equation os Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)

First, calculate the number of moles of both reactants as follows:

Moles of Fe2O3 = Amount of Fe2O3 / molar mass

Moles of Fe2O3 =22.00 g / 159.69 g/mol = 0.138 mol

Moles of CO = Amount of CO / molar mass

Moles of CO =14.42 g / 28.01 g/mol = 0.515 mol

Now determine the limiting agent as follows:

The limiting reagent is a substance that limits the amount of product in the reaction. This limiting agent is completely consumed in the reaction.

Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)

0.138 mol Fe2O3 x 3 mol CO / 1 mol Fe2O3 = 0.414 mol CO

Here Fe2O3 is a limiting agent and CO is present in excess. 0.414 mol CO used thus calculate the remaining mol of CO as follows:

0.515 mol CO - 0.414 mol CO = 0.101 mol CO.

Mass of CO = 0.101 mol CO x 28.01 g/mol = 2.83 g CO

2.83 g CO of the excess reactant is left.

Chemical Reaction Types This reaction has a single substitution reaction. Balance strategy Al and Fe are exchanged in this single exchange reaction. Two moles react with 15 moles of oxygen to produce 14 moles of carbon dioxide gas along with 6 moles of water. The most common type of corrosion is uniform corrosion. Here, a uniform oxide layer appears on the surface of the material.

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Normality of a solution of sulfuric acid (H2SO4) that containing 86 g

per liter of solution is 1N

The gram equivalent weight of a solute per liter of solution is what is known as a solution's normalcy. The comparable concentration is another name for it. The units of concentration are denoted by the symbols N, eq/L, or meq/L (= 0.001 N). A hydrochloric acid solution's concentration, for instance, could be stated as 0.1 N HCl. The reactive capacity of a specific chemical species is measured by gram equivalent weight or equivalent (ion, molecule, etc.). Utilizing the chemical species' molecular weight and valence, the equivalent value is calculated. The only concentration unit that is reaction-dependent is normality.

g equivalent mass of H2SO4 = 86g

Volume of solution in liter = 1 l

number of g equivalent of H2SO4 = 86/86 = 1

Normality = number of g equivalent/ volume of solution in liter

N = 1 / 1

Normality = 1 N

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The temperature at which the gas will occupy a volume of 2.5L is 472°C.

Charle's law states that "the volume of a fixed mass of gas held at constant pressure varies directly with the absolute temperature".

i.e we get [tex]$V_1[/tex]/[tex]$T_1[/tex] =[tex]$V2_1[/tex]/[tex]$T_2[/tex] .

Now, we have [tex]$V_1[/tex]= 1.0L, [tex]$T_1[/tex] = 25°C = (25+273) K = 298 K

                        [tex]$V_2[/tex]  = 2.5L, [tex]$T_2[/tex]  = ?

Let's substitute these values in the above equation,

[tex]$V_1[/tex]/[tex]$T_1[/tex] = [tex]$V_2[/tex]/[tex]$T_2[/tex]

1.0/298 = 2.5/[tex]$T_2[/tex]

[tex]$T_2[/tex] = 2.5 X 298

[tex]$T_2[/tex] = 745 K

OR

[tex]$T_2[/tex] = 745-273 = 472°C

Thus, the temperature at which the gas will occupy a volume of 2.5L is 472°C.

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When a reaction's heat is calculated under constant pressure, it equals the enthalpy change. At constant volume or constant pressure, a chemical reaction produces an enthalpy change, which is a heat change.

Enthalpy change indicates how much heat was absorbed or released during the reaction. It is shown by the H. Franklin Electric Sub drive series of constant constant pressure systems, which adjust the pump's speed to suit changing water demand while maintaining constant pressure throughout the system. In sub drive systems, a pressure sensor measures the water pressure, transmits a controller, and controls the pump's speed. Although no work is done when a reaction is conducted in a bomb calorimeter at constant volume, the pressure inside the calorimeter may change.

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The formulas below correctly represent the ionic compounds of the elements involved in CSCI Na3P Al2S3.

For binary ionic compounds, the compounds are named by writing the cation name first, followed by the anion name. For example, KCl, an ionic compound containing K+ and Cl- ions, is called potassium chloride. Consider the electronegativities of two related atoms. The greater the difference, the more ionic the bond.

For a compound as a whole, its polarity can be considered from the configuration of the polar bonds through the molecular conformation. An ionic bond is formed when an electron moves from one atom to another. Ions of different elements can be combined by forming ionic bonds. Cations and anions are formed when atoms lose or gain electrons.

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The following are some things you do to help you learn and remember new words and they mean:-

Reading is one of the only methods to teach vocabulary and normal learning is the approach that gives college students the possibility to exercise and grasp the stages of crucial reading that result in studying success and progressed word utilization.

One of the maximum impactful mastering techniques is allotted practice spacing out your analyzing over several brief intervals of time over several days and weeks. The only exercise is to work a quick time on every elegance every day.

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The molar concentration of NaOH can find out from the molarity of the titrant HCl. The molarity of NaOH is found to be 0.038 molar.

What is molarity?

Molarity is the number of moles of solute per volume of solution in liters. Here, the HCl has the density of 0.7292 g/l and volume 20L . Its mass is calculated as:

mass = density × volume

         = 0.7292× 20L

         = 14.58.

The molar mass of HCl is 37.5. Thus its number of moles in the solution is  14.58/37.5 = 0.388.

At the end point the number of moles of NaOH and HCl will be equal thus, where the volume of the NaOH solution is 10 ml. Now the molarity can be find out as follows:

molarity = number of moles /volume

             = 0.388/10 = 0.038 M.

Hence, the molarity of HCl is 0.038 M.

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10x - 74 = 92  --->  (Add 74 to both sides. This gets rid of the 74)

     + 74   +74

10x = 166   --->  (Simplify. The 74 you added to the 92 becomes 166)

10x/10 = 166/10    ---> (Divide both sides by 10. This gets the x by itself)

v(Simplify)v

x = 83/5    OR    x = 16.6

The molar mass of the given gas is equal to 68.48 g.

The ideal gas law can be described as an equation of the state of a hypothetical perfect gas. This equation can be represented as the product of the volume and pressure of one-mole perfect gas is equal to the product of the universal gas constant and absolute temperature of that gas.

The mathematically, ideal gas equation can be written as follows:

PV = nRT

Where n is the moles of gas, P is the pressure,  V is the volume of the gas,  and R is the gas constant.

Given, the volume of collected gas, V = 165 ml = 0.165 L

The temperature of the gas, T = 27° C = 273 + 27 = 300 K,

The pressure of gas, P = 765 mmHg = 0.99 atm

The value of the gas constant, R = 0.082 atm L /K mol

Substituting the values V, R, P, and T in the equation, we get:

The number of moles of the gas, n = PV/RT

n = 0.99 ×0.165/(0.082 × 300)

n = 0.0066 mol

The molar mass of the gas = 0.452/ 0.0066 =68.48 g/mol

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From the structure of the molecule as shown, the molecule is chiral.

We say that a molecule is chiral if there is a carbon atom in the molecule that is bonded to  four different atoms or groups. In this case, we can say that the molecule is chiral in the sense that is handed and it is able to  rotate the plane of polarized light.

Having said that much we can see that there is a carbon atom that is in the compound that is shown that is bond to four different atoms or groups thus it has fulfilled the requirement to say that the molecule is chiral.

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For reflex action the motor neuron that generates the reflex action and pass to the sensory neuron. Interneuron helps to sensory neuron to communicate with motor neurons. Thus in this picture, the motor neuron be the interneuron and interneuron be the motor neuron. Thus option A and D are correct.neuron should be the interneuron.

Reflex action is generated by our body by the sudden action to for sense of touch or other stimulants. For example, if touch a very hot body, we will take our hand within second and this is resulted by the action of neuron and is called the reflex action.

The movement of hands and legs are controlled by the motor neurons. If we touch any stimulant sensory neurons pass signals to the motor neuron and a signal containing the information of action is returned to the sensory neurons of our hand.

Here, the communication between sensory neuron and motor neuron is facilitated by interneurons. Thus, in this picture the motor neuron be the interneuron and interneuron be the motor neuron. Thus option A and D are correct.

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The polar molecules are A and D while the non polar molecules are B C E F.

We know that the polar molecules are the molecules that have a structure that is not symmetrical. If a compound is seen to be symmetrical then such a compound can not be a polar molecule. This what we have to look out for in each of the compound.

We would look at a compound as symmetrical if the compound is able to have the same groups that are attached to it in such a way that the attached groups are indistinguishable from each other. If we label the molecules from A to F we can locate the molecules that are polar and non polar.

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Answer:

A

Explanation:

The energy is required to completely separate an electron from a proton that is 200 pm away is 1.15 × 10⁻¹⁸ J.

the energy expression is given as :

E = K q1 q2 / r

where,

K = 9 × 10⁹ Nm²C⁻²

q1 = charge of proton = 1.6 × 10⁻¹⁹ C

q2 = charge of electron = -  1.6 × 10⁻¹⁹ C

r = distance = 200 × 10⁻¹² m

substituting the values :

E = (9 × 10⁹ ×  1.6 × 10⁻¹⁹ ×  -  1.6 × 10⁻¹⁹ ) / 200 × 10⁻¹²

E = 1.15 × 10⁻¹⁸ J

Thus, The energy is required to completely separate an electron from a proton that is 200 pm away is 1.15 × 10⁻¹⁸ J.

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Answer:

Water - H2O.

Ammonia - NH. ...

Sulfur dioxide - SO. ...

Hydrogen sulfide - H2S.

Ethanol - C2H6O.

Explanation:

Answer:

Water - H2O.

Ammonia - NH. ...

Sulfur dioxide - SO. ...

Hydrogen sulfide - H2S.

Ethanol - C2H6O.

The volume of the given ball is 21 L.

Pressure = 1.0 atm      

no. of moles = 0.85 mol

Temperature = 25°C = (25+273) K = 298 K.

we will use the ideal gas equation,

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Let's substitute the values into the above formula,

1.0 x V = 0.85 x 0.0821 x 298

V =  20.7 [tex]\approx[/tex] 21 L.

Thus, the volume of the ball is 21 L.

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There is no reaction between zinc II sulfate and magnesium sulfate.

We know that a reaction is said to occur when two species are combined and there are new products that appear in the system. This implies that if there are no new substances that appear in the system we can not say that a chemical reaction has taken place.

In this case, we can see that we can not be able to observe any change when wee mix a solution of magnesium sulfate and zinc II sulfate since the both of them have the same anion.

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The partial pressure of an individual gas from a certain mixture of gas can be determined by its mole fraction and total pressure.

Total pressure of both mixtures are same so there partial pressure must be determined from its mole fraction. Mole fraction is defined as the number of molecules of a particular component in a mixture divided by the total number of moles in the given mixture.

Mole fraction (X):

X(solute) = (Moles of solute) / Total moles of solution

X(solvent) = (Moles of solvent) / Total moles of solution

∵ X(solute) + X(solvent) = 1

Hence, the partial pressures of the individual gases of gas-1 and gas-2 can be determined from its mole fraction.

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According to electronic configuration , atomic size within a period decreases from left to right as electrons are added to same shell while in group it increases as new shell is added in each successive element in group.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

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The amount of substance is measured with the SI unit, the mole.

Mole is the ratio of the given mass of substance to the molar mass of that substance.

Or it is the ratio of the number of molecules of substance to the Avogadro number.

Mathematically, it can be written as

Mole = given mass / molar mass

Or Mole = number of molecules / Avogadro number.

For first case,

Temperature is measured with the SI unit, the celsius. So, this is incorrect option.

For second case,

As we know that, mass is measured with the SI unit, the gram. So, this is also incorrect option.

For fourth case,

Length is measured with the SI unit, the metre. So, this is also incorrect option.

Therefore, option C is the correct option.

Thus, we concluded that the amount of substance is measured with the SI unit, the mole.

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88 is the nearest whole number [tex]88\frac{196}{480}[/tex].

Rounding is a process to estimate a certain number in a context. To determine how to round a number, look at the next digit in the appropriate position; if it is less than 5, round down, and if it is more than 5, round up.

The major figures of a particular number are those key or significant digits that accurately represent the meaning of the number.

[tex]88\frac{196}{480}[/tex] is mixed friction.

Changing the mixed fraction into improper fraction number by :

Multiplying 88 × 480 = 42,240

Adding 196 to this number = 42240 + 196

= 42,436/480

= 88.40

≈ 88

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Methane has covalent bonds. Carbon has four valence electrons, so it can bond with four hydrogen atoms, each of which has one valence electron. The carbon atom is more electronegative than the hydrogen atoms, so it attracts the electrons in the bonds more strongly than the hydrogen atoms do.

What is covalent bond ?

A covalent bond consist of the mutual sharing of one or more pairs of electrons between two atoms.

Carbon has four electrons in its  valence shell ( it needs four electrons to fill its valence electron ) and Hydrogen have one electrons in its valence shell ( and needs two electrons ) . So Carbon shares total four electrons , one with each Hydrogen and all four Hydrogen shares their one electrons with carbon.

Hence , covalent bonding is present in methane molecule.

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W = Pexternal(ΔV),W = (1 atm) 8.93  L - 1 L)(101.3 J/1 L·atm)= 803.309J. W. Work, pressure, and volume are directly correlated using a formula. W = Pexextr(V) Consequently, the environmental work is 803.309J. W

Market share comes in two flavors: value and volume. The business's overall shares of its total accumulated sector sales serve to define a value market share. On the other hand, a volume market share refers to the precise number of units that an entity markets relative to the total number of units that are sold in the market.

W = quantity of work completed =?

1.00 atm of pressure is P.

1.00 L is the initial volume.

= 8.93 L ultimate volume

W = Pexternal(ΔV),W = (1 atm) 8.93  L - 1 L)(101.3 J/1 L·atm)= 803.309J. W.

How much room an object occupies is determined by its volume. It is calculated using the quantity of unit cubes required to completely fill the solid. We have 30 unit cubes in the solid after counting the unit cubes, hence the volume is 2 units. 3 units 1 unit equals 30 cubic units

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A 5.00 mL sample of barium hydroxide is titrated to the phenolphthalein endpoint using hydrochloric acid. The five mL sample requires 18.02 mL of 0.0873 M HCl solution to reach the endpoint. The concentration of Ba(OH)₂ solution is 0.157 M.

The concentration of a compound is defined as the amount of solute dissolved in the solution. It is calculated by the formula

Concentration=moles/volume in L

The reaction between Ba(OH)₂ and HCl is given as

Ba(OH)₂+2HCl→BaCl₂+2H₂O

By using volume and molarity, first we need to calculate moles of HCl. The moles of HCl is calculated using volume and molarity as

Molarity=moles/volume in L

Rearrange the formula for moles

moles=Molarity×volume in L

Convert the given volumes in L

18.02 mL×(1 L/1000 mL)=0.01802 L

5.00 mL×(1 L/1000 mL) = 0.005 L

Hence, moles of HCl will be

moles=(0.0873 mol/L)×0.01802 l

moles=0.001573146 mol

The mol to mol ratio between Ba(OH)₂ and HCl is 1:2. Hence moles of Ba(OH)₂ reacted with HCl is

(0.001573146 mol HCl×1 mol Ba(OH)₂/2 mol HCl)

=0.000786573 mol Ba(OH)₂

Therefore, the molarity of Ba(OH)₂ is

Molarity=(0.000786573 mol/0.005L)

=0.1573146 mol/L

=0.157 M (∵M=mol/L)

Therefore, the molarity of Ba(OH)₂ solution is 0.157 M.

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Answer: C

l

2

→

H

C

l

O

C

l

2

→

2

H

C

l

O

(Cl balance)

C

l

2

+

2

H

2

O

→

2

H

C

l

O

(O balance)

C

l

2

+

2

H

2

O

→

2

H

C

l

O

+

2

H

+

(H balance)

C

l

2

+

2

H

2

O

→

2

H

C

l

O

+

2

H

+

+

2

e

−

(Charge balance)

C

l

2

+

2

H

2

O

→

2

H

C

l

O

+

2

H

+

+

2

e

−

balanced half-reaction)

Explanation:

The molarity of a solution containing 150 mL of a 3.25 M sodium hydroxide ( NaOH ) solution after we add 275 mL more water is 1.14 M

Given that :

molarity of solution M1 = 3.25 M

volume of solution V1 = 150 mL

Molarity of solution M2  = ?

Volume of solution after dilution V2 = 150 mL + 275 mL = 425 mL

using the dilution law , we get :

M1 V1 = M2 V2

M2 = (M1 V1) / V2

M2 = ( 3.25 × 150 ) / 425

M2 = 1.14 M

Thus, The molarity of a solution containing 150 mL of a 3.25 M sodium hydroxide ( NaOH ) solution after we add 275 mL more water is 1.14 M

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Rocks formed by the process of erosion, deposition, and compaction of sediments are called Sedimentary Rocks.

The three main types of rocks are Igneous, Sedimentary, and metamorphic rocks. They are formed on or near the Earth’s surface from the compression of ocean sediments or other processes.

Igneous rocks are formed when hot, molten rock crystallizes and solidifies after cooling down. When these rocks are weathered due to the process of erosion, deposition, and compaction of sediments they turn into  Sedimentary rocks. These types of rocks generally consist of fossils. When the sedimentary rocks are subjected to tremendous temperature and pressure they get converted into metamorphic rocks. The metamorphic rocks when get ejected out of the volcano in the form of hot magma turn into igneous rocks on cooling. This cycle of rocks continues.

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I disagree, the presence of water would decrease rather then increase the concentration of the precipitate.

We know that the term concentration has to do with the amount of substance that is present in a system. We know that water temds to reduce the concentration of a system. The more the amount water in the system, the less the amount of the substance in the system.

The filter paper is used to weigh the precipitate or the solid product that is obtained in the reaction. We know that the standard practice is that the filter paper ought to be dried and then we can then be able to weigh it and obtain the mass of the substances that was in the solution.

If the filter paper is not fully dry, we would have more amount of water in the system and this would reduce the amount of the AgCl thereby reducing the concentration rather than increase it.

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Explanation:

V = kn

V1/n1 = V2/n2

V1 = 125ltrs, n1 =6 moles, n2 =?, V2 = 175ltrs

n2 = V2.n1/V1 = (175 × 6) ÷ 125

= 8.4 moles

The helium must be added to a balloon currently holding 6.00 moles in order to increase its volume from 125 liters to 175 liters is 8.4 moles.

The International System of Units uses the mole as the unit of material quantity. How many elementary entities of a certain substance are present in an item or sample is determined by the quantity of that material. It is specified that the mole contains precisely 6.023 × 10⁻²³

An SI unit that connects the microscopic and macroscopic worlds is the mole. It enables researchers to measure vast numbers of extremely tiny objects, such atoms or molecules. Initially, measurements of chemical elements or compounds were expressed in terms of "gram-atom" and "gram-molecule" units.

However, the Latin term moles, which meaning "a mass," is where the word mole ultimately originates, not from German.

v₁ ÷ n₁ = v₂ ÷ n₂

v₁ = 125l,

n₁ =6 moles,

n₂ =?,

v₂ = 175l

n₂ = v₂.n₁ ÷ v₁ = ( 175 × 6 ) ÷ 125

= 8.4 moles

Thus,The helium must be added to a balloon currently holding 6.00 moles in order to increase its volume from 125 liters to 175 liters is 8.4 moles.

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