A lead ball is added to a graduated cylinder containing 31.8 mL of water, causing the level of the water to increase to 93.7 mL. What is the volume in milliliters of the lead ball?
a) 31.8 mL
b) 61.9 mL
c) 93.7 mL
d) 125.5 mL

Answer:

two different ways are 1st by using water and 2nd by using wind these also not harm our environment

The answer is 0.0026.

Solution:

(V₁) Volume of NaOH = 100 mL

(V₂) Volume of HCl = 30.22 mL

(M₂) molarity of HC = 0.0750 m

(m₁) molarity of NaOH =

By using relation

M₁V₁ = M₂V₂

M₁ = M₂ V₂/V₁

M₁ =  0.0750ML*30.22mL/100 mL

M₁ = 0.0226

Now

molarity of NaOH = mole of NaOH/Volume of NaOH (in L)

mole of NaOH = molarity x volume

= 0.0226 mol/L X 100 X 10⁻³ L

= 0.0026 mol So the mole of NaOH is 0.0026.

When titrating NaOH with HCl using methyl orange as an indicator the endpoint color changes from yellow to red, so add HCl to the burette. This is just for ease of calculation. Put the hydrochloric acid in the burette and the soda solution in the Erlenmeyer flask. Methyl orange is used as an indicator.

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Answer:

A. Barium

Explanation:

hope this helps! :)

Answer:

3.6 gallons are equal to 56 cups

To make a buffer solution, you must use solutions of a weak acid and its conjugate base.

For example, if you wanted to make a buffer solution with a pH of 4.5, you would mix a solution of acetic acid (CH3COOH) and sodium acetate (CH3COONa).

The acetic acid is the weak acid and the sodium acetate is its conjugate base. The concentrations of the two solutions should be in a ratio of 1:1 in order to maintain the desired pH.

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Answer:

wait are you talking about the bottom question??

Answer: 2.04

Explanation:

Answer:

Approximately \(0.821\; \rm mol\).

Explanation:

Look up the relative atomic mass of \(\rm Ba\), \(\rm O\), and \(\rm H\) on a modern periodic table:

Calculate the formula mass of \({\rm Ba(OH)_2}\):

\(\begin{aligned}& M({\rm Ba(OH)_2}) \\ &= 137.327 + 2\times(15.999 + 1.008) \\ &\approx 171.334\; \rm g \cdot mol^{-1}\end{aligned}\).

Calculate the number of moles of \({\rm Ba(OH)_2}\) formula units in that \(235\; \rm g\) of this compound:

\(\begin{aligned}& n({\rm Ba(OH)_2}) \\ &= \frac{m({\rm Ba(OH)_2})}{M({\rm Ba(OH)_2})} \\ &= \frac{235\; \rm g}{171.334\; \rm g \cdot mol^{-1}} \approx 1.37159\; \rm mol \end{aligned}\).

Calculate the volume of a \(c({\rm Ba(OH)_2}) = 1.67\; \rm mol \cdot L^{-1}\) with approximately \(n({\rm Ba(OH)_2}) = 1.37159\; \rm mol\) of the solute:

\(\begin{aligned}& V({\rm Ba(OH)_2}) \\ &= \frac{n({\rm Ba(OH)_2})}{c({\rm Ba(OH)_2})} \\ &= \frac{1.37159\; \rm mol}{1.67\; \rm mol \cdot L^{-1}} \approx 0.821\; \rm L \end{aligned}\).

Answer:

\(2H_2O\rightarrow 2H_2+O_2\)

Explanation:

Hello there!

In this case, for the reaction by which water is decomposed to molecular hydrogen and oxygen:

\(H_2O\rightarrow H_2+O_2\)

It is necessary to perform the inspection balance process since there is a dissimilar number of atoms of oxygen on both sides; therefore, by putting a 2 on water we balance oxygen:

\(2H_2O\rightarrow H_2+O_2\)

But now, there are four hydrogens on the left; therefore, we put a 2 on hydrogen to finally balance it:

\(2H_2O\rightarrow 2H_2+O_2\)

And obviously, the coefficient in oxygen is an unwritten 1.

Best regards!

We know the standard reduction potentials of the half-cells involved, so we can find the cell voltage and the spontaneous reaction. Thus;

The anode reaction is:

Pb(s) → Pb2+(aq) + 2e-

This is the oxidation half-reaction that occurs in the Pb half-cell.

The cathode reaction is:F2(g) + 2e- → 2F-(aq).

This is the reduction half-reaction that occurs in the F2 half-cell.

The spontaneous cell reaction is

:Pb(s) + F2(g) → Pb2+(aq) + 2F-(aq).

This is the combination of the oxidation and reduction half-reactions, with the electrons canceled out from both sides.

The cell voltage is 2.996 V The standard cell potential is calculated as follows:

standard cell potential = E°(reduction) - E°(oxidation)standard cell potential = 2.870 V - (-0.126 V)standard cell potential = 2.996 V, The cell voltage is positive, indicating that the reaction is spontaneous.

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Answer:

True

Explanation:

The Kb of methylamine is 4.4 × 10⁻⁴.

The pH of a 0.35 M aqueous solution of CH₃NH₂ (methylamine) can be determined using the Henderson-Hasselbalch equation. The Henderson-Hasselbalch equation states that the pH of a solution can be determined by taking the negative logarithm of the base-to-acid ratio.

In this case, the base-to-acid ratio is equal to the concentration of the base, CH₃NH₂, divided by the acid, CH₃NH³+. The acid dissociation constant, Kb, is then used to calculate the concentration of the acid. The Kb of methylamine is 4.4 × 10⁻⁴.

After plugging in the appropriate values into the Henderson-Hasselbalch equation, the pH of the solution can be calculated to be 12.09. This indicates that the solution is basic in nature, as all pH values greater than 7 are considered to be basic.

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Answer:

The lung

Explanation:

The model of the respiratory system made by Megan consists of two balloons. The first balloon stretched across the bottom of the bottle represents the diaphragm which contracts and relaxes to allow air in and out of the lungs. The balloon inside the bottle represents one lung.

Breathing in causes the balloon inside the bottle to be filled with air. This is preceded by the expansion of the diaphragm which makes the lungs to be filled with air. Breathing out causes a contraction of the diaphragm thus making the lungs to let out air.

Answer:

You're Lungs

Explanation:

When you breathe in, air flows into your lungs. When you breathe out, air flows out of your lungs. The balloon inside the bottle is like one of your lungs.

Explanation:

A.

AgNO₃ + KCl → AgCl + KNO₃ (Already Balanced)

B.

H₂O + SO₃ → H₂SO₄ (Already balanced)

C.

2KI + Cl₂ → 2KCl + I₂

D.

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

E.

Zn + 2HCl → ZnCl₂ + H₂

F.

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

G.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

H.

2Al + 3CuCl₂ → 2AlCl₃ + 3Cu

\(\\ \tt\leadsto pH=-log[H^+][/texM

\(\\ \tt\leadsto pH=-log[3.4\times 10^{-11}]\)

\(\\ \tt\leadsto pH=-log3.4-log10^{-11}\)

\(\\ \tt\leadsto pH=-0.53+11\)

\(\\ \tt\leadsto pH=10.47\)

Basic

Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= - log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.

Replacing in the definition of pH:

pH= -log (3.4×10⁻¹¹ M)

Solving:

pH=  10.47

Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

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Answer:

Krypton. Atomic Mass. 83.80u. Electron Configuration. [Ar]4s23d104p6.

Atomic Mass: 83.80u

Electron Configuration: 4s23d104p6

Year Discovered: 1898

The reaction of methyl iodide with sodium azide, NaN₃, proceeds by an SN2 mechanism. The effect of doubling the concentration of NaN₃ on the rate of the reaction is the rate increases by a factor of 2. The correct answer is C.

The alkyl halide is attacked by the nucleophile as the SN2 mechanism. as a partial bond is formed involving the nucleophile and carbon atom. Halide and carbon's bond partially dissolves. A transition is created where there are five bonds around the carbon atom. The product is created when the leaving group, which is a halide, removes the electrons from the C-X link and departs the molecule.

R-X + Nu⁻ → Nu 

--R--X → Nu-R + X⁻ 

Since a transition state that contains both a nucleophile and a substrate is used for the nucleophilic substitution. It was discovered that the concentration of the substrate and the nucleophile both affect the rate of the reaction.

Rate = k [substrate] [nucleophile]

Since sodium azide is the nucleophilic species and methyl iodide is the substrate,

Rate = k[CH₃I][NaN₃]

both the reactants take part in the reaction and the rate law for the reaction. As a concentration of NaN₃ is doubled, the new rate becomes,

Rate' = k[CH₃I][2 NaN₃]

        = 2 k[CH₃I][NaN₃]

        = 2 Rate

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Therefore, the pH value of the solutions with [H+] values of 0.01, 1.0 x 10 –8, and 4.67 x 10 –4 are 2.0, 8.0, and 3.33 respectively.

pH is a measure of acidity or alkalinity of a solution and ranges from 0 to 14.

The value of pH is defined as the negative logarithm of hydrogen ion concentration. The hydrogen ion concentration in a solution is a measure of its acidity or basicity. The higher the hydrogen ion concentration, the lower the pH value, and the solution is more acidic. Similarly, the lower the hydrogen ion concentration, the higher the pH value, and the solution is more alkaline.

Hence, the pH value of the solutions with the given [H+] values can be calculated as follows:

a) [H+] = 0.01pH

= -log[H+]

= -log(0.01)

= 2.0

b) [H+] = 1.0 x 10 –8 pH

= -log[H+]

= -log(1.0 x 10 –8)

= 8.0

c) [H+] = 4.67 x 10 –4 pH

= -log[H+]

= -log(4.67 x 10 –4)

= 3.33

It is important to remember that the hydrogen ion concentration [H+] is measured in moles per liter (mol/L), and the pH value of a solution can be calculated using the formula: pH = -log[H+].

Also, the negative sign in the formula indicates that the pH value is inversely proportional to the hydrogen ion concentration.

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Answer:

Molecule

Explanation:

Compounds are chemical substances comprising of two or more elements. The smallest particle contained in a compound is the MOLECULE. Molecules are combinations of atoms (same or different) of an element held together by a chemical bond.

Since a compound is a molecule with two or more elements combined, the chemistry of the molecules contained in a compound determines its chemical properties. This means that the molecules of a compound are responsible for the interactions of a compound in a chemical reaction. Examples of molecules are H2O, N2, O3 etc.

Answer: valence electrons are simply the electrons in the outer most ring of the chart. in your example, this atom has four valence electrons.

Answer:

conclusion

Explanation:

it can't be a hypothesis since tests are carried out to verify so it is not a theory

an introduction to an experiment only gives the basis of what we are investigating therefore nothing has been proven and the question is still unanswered

The overall takeaway of an experiment’s results is the conclusion. Hence, option C is correct.

A hypothesis is a testable statement about the relationship between two or more variables or a proposed explanation for some observed experiment.

The overall takeaway of an experiment’s results can't be a hypothesis since tests are carried out to verify so it is not a theory

An experiment only gives an idea about the investigation therefore nothing has been proven and the question is still unanswered.

Hence, the overall takeaway of an experiment’s results is the conclusion.

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The chemical process involves the conversion of raw materials into usable products. It uses a significant amount of energy, which results in high operating costs.

Therefore, energy conservation is a crucial factor in the chemical industry, which would help reduce the operating cost and environmental pollution. Several strategies have been developed, which include exergy, energy harvesting, power generation, thermoelectric conversion, and insulation.Exergy:Exergy is a measure of the energy that is available to do work. It is the portion of the energy that can be converted to useful work.

Therefore, exergy analysis is used to evaluate the efficiency of the chemical process and identify areas where energy can be saved.

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Answer:

Sieve

Explanation:

A sieve or screen would be the best tool to use when separating a mixture of sand and gravel.

Answer:

the third option on edge:)

Explanation:

an arithmetical multiplier for converting a set of units to another set of units. For example, a foot is 12 inches, so if you were to convert three feet to inches the equation would be 3ft/Xin and you would multiply three by twelve to get 36 inches.

Answer:

Prophase, metaphase, anaphase, telophase

Explanation:

Considering the molecular shapes:

a.) The molecular shape with the most electron pairs around the central atom is option A.

b.) The shape with the most unshared pairs around the central atom is option A.

c.) The one with only shared pairs around the central atom is option C and D

Shared pairs of electrons represented as bonding pairs while unshared pairs of electrons are pairs that are not bonded also known as lone pairs.

These electrons are determined by the total number of bonding and un-bonding electrons of a compound using the equation, "S = N - A, where S is the total number of shared electrons, N the number of valence shells while A is the number of electrons available in valence shells of atomic structure.

Full question is:

a) O; (b) He; (c) F; (d) H; (e) P

Consider the following molecular shapes.

(a) Which has the most electron pairs (both shared and unshared) around the central atom?

(b) Which has the most unshared pairs around the central atom?

(c) Do any have only shared pairs around the central atom?

(a) A

(b)A

(c)C&D

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Law of Conservation of mass: Mass cannot be created nor destroyed. Reference: Antoine Lavoisier – By carefully weighing the reactants & products of chemical reactions. The laws of chemical combination describe the basic principles obeyed by interacting atoms and molecules, interactions that can include many different combinations that happen in many different ways. This amazing diversity of interactions allows for an astounding variety of chemical reactions and compounds. The most fundamental concept in chemistry is the law of conservation of mass, which states that there is no detectable change in the quantity of matter during an ordinary chemical reaction. Modern chemistry is based on several fundamental laws, including:

Answer:

true

Explanation:

The molecules of two liquids mix together and form a new liquid. However, the liquid formed might be miscible or immiscible.

When two liquids are mixed together it forms a new solution. The new liquid has the properties of both of the original liquids.

The formed liquid may either be miscible or immiscible depending upon the properties of the two liquids.

Miscible liquids become homogeneous solutions so that their composition would be uniform. This is done by the complete diffusion of both liquids.

But in the case of immiscible liquids, the solution forms two separate layers giving out heterogeneous solutions.

Therefore, the combination of 2 liquids gives a new solution that could either be homogeneous or heterogeneous.

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