A pan containing hot water is left on the counter and becomes cool mainly due to.

1.43 mol of neutral molecular hydrogen gas contains 2.75 x 10⁵ coulombs of positive charge

1.43 mol of neutral molecular hydrogen gas contains 6.02 x 10²³ x 1.43 = 8.61 x 10²³ hydrogen molecules.

Each hydrogen molecule contains two hydrogen atoms, each of which has a charge of 1.60 x 10⁻¹⁹ coulombs, giving a total of 2 x 1.60 x10⁻¹⁹ x 8.61 x10²³ = 2.75 x 10⁵ coulombs of positive charge in 1.43 mol of neutral molecular hydrogen gas.

To explain, the number of coulombs of positive charge in a given amount of a neutral substance can be calculated by determining the number of hydrogen atoms in the substance and then multiplying that number by the charge on a single hydrogen atom.

The number of hydrogen atoms in a substance can be found by using Avogadro's number and the number of moles of the substance. Avogadro's number is a constant that represents the number of particles (such as atoms or molecules) in one mole of a substance.

In this case, the number of hydrogen atoms in 1.43 moles of molecular hydrogen gas can be calculated as 6.02 x 10²³ x 1.43 = 8.64 x 10²³ hydrogen atoms.

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Answer:

Explanation:

True or false 4 questions help please!

Most mixtures are not physical changes.

True

False   FALSE  when I add solid NaCl salt to water I no longer have a solid salt, I have a solution of sodium and chlorid ions in liquid water.  this is  physical change

Chemical Changes do not create a new substance.

True

False  FALSE 0ne of the proofs that you have a chemical change is the presence of a new substance

Fire is an example of a Chemical Change.

True  TRUE  fire is oxygen reacting wiIh mattter to form new compounds

False

Explosions are not chemical changes.

It depends on the explosion  if I blow up a balloon until it POPS!! that is physical chame.  If I light a firecracker and it explodes, that is a chemical change of oxygen reacting with hot gunpowder

A change in color and odor are both examples of chemical changi

I would rewrite the question as  

A change in color and odor  both INDICATE a chemical change

and that is

True  TRUE

False

F

True   Fire is an example of a Chemical Change.

True

False

Explosions are not chemical changes.

True

False

Answer:

the answer to this is 74 :)

Answer:

2Li(OH)-->Li2O+H20

Explanation:

There are 2Li, 2H and 2O on each side

Answer:

MgF2...............

Answer:

C and D

Explanation:

Hope this helped!

Scientist who studies new types of medicine and  scientist who studies the chemistry of plants and fertilizer are examples of a biochemist ,therefore option (c and d ) is correct .

Biochemists are scientists who are trained in biochemistry.

They study chemical processes and chemical transformations in living organisms. Biochemists study DNA, proteins and cell parts .

Biochemist deals with the chemical processes occuring within living organisms .

Biochemist work-

A biochemist will typically conduct research projects, manage laboratory teams, prepare technical reports and present research findings to scientists .

Scientist who studies new types of medicine and  scientist who studies the chemistry of plants and fertilizer are examples of a biochemist, therefore option (c and d ) is correct .

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Answer:

the answer is

113 mL

hope this will help you ❤️

Answer:

You know that nitrogen-14 has 7 protons in the nucleus because it is an isotope of nitrogen, which has an atomic number equal to 7 . Because nitrogen-14 is a neutral atom, the number of protons it has in its nucleus must be equal to the number of electrons that surround its nucleus.

Answer:

Boyle's law

Explanation:

Answer:

They are both letters?

Explanation:

The question is incomplete, the complete question is;

A student investigated some properties of lead and recorded the findings in the table below. Property Observation Color Dull gray Density 11.3 g/cm3 Volume of sample 3 cm3 Melting point 327°C Reaction with air Lead oxide forms on the surface Electrical conductivity Conducts some electricity Which statement is true with respect to the investigation?

A. The student investigated only the physical properties of lead.  

B. The student investigated only the chemical properties of lead.  

C. The student investigated more physical properties than chemical properties of lead.  

D. The student investigated more chemical properties than physical properties of lead.

Answer:

The student investigated more physical properties than chemical properties of lead.

Explanation:

If we look at the things mentioned in the question as regards the approach of the student towards the study of lead, we will discover that he/studied;

Colour, density, volume, melting point and electrical conductivity which are all physical properties. Physical properties of a substance does not involve chemical reactions of the substance under study.

The only chemical property studied by the student is its formation of an oxide- lead oxide with air as follows;

2Pb(s) + O₂(g) → 2PbO(s)

Thus we can safely conclude that; the student investigated more physical properties than chemical properties of lead.

Answer:

c

Explanation:

edge 2021 :)

The balanced chemical equation for the reaction between oxygen and hydrogen to form water is:

2H2 + O2 → 2H2O

The molar mass of oxygen is 32 g/mol. Therefore, 64.0 g of oxygen is equivalent to 2 moles of oxygen. Since there is excess hydrogen, it is the limiting reactant and will determine the theoretical yield of water.

To calculate the theoretical yield of water, we need to use stoichiometry. From the balanced equation, we know that 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water. Therefore, 2 moles of hydrogen will produce 2 moles of water.

Using the molar mass of water (18 g/mol), we can convert the number of moles of water to grams:

2 moles H2O × 18 g/mol = 36 g H2O (theoretical yield)

To calculate the percent yield, we divide the actual yield by the theoretical yield and multiply by 100:

percent yield = (actual yield / theoretical yield) × 100

percent yield = (60 g / 36 g) × 100

percent yield = 166.7%

Since the percent yield is greater than 100%, this suggests that there may have been errors in the experimental procedure or measurements. Factors such as incomplete reactions, loss of product during transfer or filtration, or impurities in the reactants can all contribute to a lower actual yield and a lower percent yield.

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Carbonyl bonds are quite polar. Because oxygen is more electronegative than carbon, there is a partial positive charge on the carbon and a partial negative charge on the oxygen. The double bond between carbon and oxygen intensifies this charge separation.

Carbonyl carbon is an electrophile that combines with nucleophiles to form a tetrahedral species. It is the most basic reaction in carbonyl chemistry. You can now add an acid to a carbonyl to make it even HUNGRY for nucleophiles.

Turbo-charged nucleophiles include enamine, enolates, and enols. The alpha carbon atom is the nucleophilic atom.

Despite the fact that that carbon is a double bonded carbon with no lone pair, that position is motivated to donate electrons due to pi donation from the oxygen.

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The sample that the student has is a metal because it has luster.

Metals are those elements that occur towards the left hand side of the periodic table. They have the following properties;

From the few properties listed above, the sample that the student has is a metal because it has luster.

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Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Answer:

C) 0.24 M

Explanation:

The given chemical reaction is presented as follows;

H₂SO₄(aq) + 2 KOH(aq) → K₂SO₄(aq) + 2 H₂O(l)

The titration experiment results are;

Volume of H₂SO₄(aq) used = 12.0 mL

Volume of KOH (aq) used = 36.0 mL

Concentration of KOH (aq) = 0.16 M

The number of moles of KOH present, n = 0.16 M × 36/1000 = 0.00576 moles

From the given reaction, 1 mole of H₂SO₄ reacts with 2 moles of KOH to give 1 mole of K₂SO₄ and 2 moles of H₂O

Therefore, 0.00576 moles of KOH reacts with (1/2) × 0.00576 moles = 0.00288 moles of H₂SO₄

Therefore, for the reaction;

The number of moles of H₂SO₄ in 12.0 mL of H₂SO₄ = 0.00288 moles

The concentration of the H₂SO₄ = 0.00288 M/(12.0 mL) = 0.24 M

The concentration of H₂SO₄ in the reaction = 0.24 M.

The right answer is (d) all of these. 4-aminobutanol/h, 5-aminobutanol/h, and 6-amino-2-hexanone/h can all be used to make cyclic imines.

In the intraperitoneal mouse bioassay, the newly identified class of marine biotoxins known as cyclic imines (CIs) causes a characteristically quick death. These poisons are macrocyclic substances having imine (a double bond between carbon and nitrogen) and spiro-linked ether moieties. chemical makeup. The cyclic imine group, which is typically found as a spiroimine, and the spiroketal ring system are two highly conserved moieties that make up the overall chemical structure of cyclic imine toxins. The macrocyclic ring of cyclic imine toxins has 14 to 27 carbon atoms.

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The degree of polymerization is a term used to describe the number of repeating units in a polymer.

It is a measure of the average molecular weight of a polymer and is determined by dividing the molecular weight of the polymer by the molecular weight of the repeating unit. The higher the degree of polymerization, the longer the polymer chain and the higher the molecular weight. This can affect the properties of the polymer, such as its strength, flexibility, and melting point.

It is an important factor to consider when designing and manufacturing polymers for specific applications.

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Answer: The new volume is 72 ml

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)

where,

\(V_1\text{ and }T_1\) are the initial volume and temperature of the gas.

\(V_2\text{ and }T_2\) are the final volume and temperature of the gas.

We are given:

\(V_1=217ml\\T_1=551^oC=(551+273)K=824K\\V_2=?\\T_2=0^0C=(0+273)K=273K\)

Putting values in above equation, we get:

\(\frac{217ml}{824K}=\frac{V_2}{273K}\\\\V_2=72ml\)

Thus the new volume is 72 ml

Answer:

71.9 is the right answer

Answer:

397,570 g/m^3

Explanation:

The volume of the cylinder can be calculated using its height and diameter.

Mass of the soil sample (m) = 30 g

Height of the cylinder (h) = 6 cm

Diameter of the cylinder (d) = 4 cm

First, we need to calculate the radius (r) of the cylinder

Radius (r) = diameter / 2 = 4 cm / 2 = 2 cm = 0.02 m

Now, we can calculate the volume (V) of the cylinder

V = π * r^2 * h

V = 3.14159 * (0.02 m)^2 * 0.06 m

V = 7.5398 E-5 m^3

Calculate the bulk density (ρ) using this formula

ρ = m / V

ρ = 30 g / 7.5398 E-5 m^3

ρ = 397,887 g/m^3

Percentage volume is the ratio of the mass of solute to the volume of the solution. The 510 ml volume of butanol should be combined with 30.0 mL ethanol.

Volume percent is the percentage ratio of the volume of the solute to the volume of solution multiplied by 100. It is given as,

\(\rm Percent \; volume = \rm \dfrac{ \text{volume of solute}}{\text{volume of solution}}\times 100 \%\)

Given,

Percent volume = 5.88%

Volume of solute = 30.0 mL

Substituting values in the equation above:

\(\begin{aligned} \rm Percent \; volume &= \rm \dfrac{ \text{volume of solute}}{\text{volume of solution}}\times 100 \%\\\\5.88 &=\rm \dfrac{30}{V} \times 100\%\\\\&= 510.20\end{aligned}\)

Therefore, 510 ml is the volume of butanol that should be added to the solution.

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Owing to the arrangement of ions in NaCl, the structure has a high melting point and crystalline structure.

Ionic compounds are know to have a crystalline structure. This is because the ions in the compound are arranged into a crystal lattice. A crystal lattice gives a regular repeating structure of ions in the crystal.

As a result of this order in the crystal, the resultant sodium chloride structure has a high melting point and crystalline structure.

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Dow Chemical would be best described as a multinational corporation in this scenario.

This is the type of corporation which are involved in controlling production of goods and services in at least one country different from that of residence.

Dow chemical is known to have a plant in Germany and Russia thereby making it a multinational corporation.

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(a)The pH of the fruit juice solution is approximately 3.5. (b) The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(b)The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(a). The hydrogen ion concentration of the fruit juice is 0.0003 mol/L. We can determine the pH of the solution using the formula pH = -log[H⁺].

pH = -log(0.0003)

pH ≈ -log(3 × 10⁻⁴)

Using a calculator, we can calculate the logarithm:

pH ≈ -(-3.5229) (rounded to the nearest tenth)

pH ≈ 3.5

Therefore, the pH of the fruit juice solution is approximately 3.5.

(b). A tomato has a pH of 3.0. We can determine the hydrogen ion concentration of this solution by rearranging the formula pH = -log[H⁺] to solve for [H⁺].

[H⁺] = 10(-pH)

[H⁺] = 10⁻³

[H⁺] = 0.001 mol/L

Therefore, the hydrogen ion concentration of the tomato solution is 0.001 mol/L.

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You can obtain approximately 258.56 ml of a 0.50 M solution by diluting 140.8 ml of a 0.92 M solution.

To determine the volume of a 0.50 M solution obtained from diluting 140.8 ml of a 0.92 M solution, we can use the formula for dilution:

C₁V₁ = C₂V₂

Where:

C₁ = initial concentration

V₁ = initial volume

C₂ = final concentration

V₂ = final volume

We need to solve for V₂, the final volume of the 0.50 M solution.

Given:

C₁ = 0.92 M

V₁ = 140.8 ml

C₂ = 0.50 M

Rearranging the formula, we have:

V₂ = (C₁ * V₁) / C₂

Substituting the given values, we get:

V₂ = (0.92 M * 140.8 ml) / 0.50 M

The units of moles cancel out, leaving us with the final volume in ml:

V₂ = (0.92 * 140.8) / 0.50

V₂ ≈ 258.56 ml

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The silicon wafer produced 23 good dies which has a yield of 92% and produced 25 dies.

The yield of a silicon wafer refers to the percentage of good dies produced out of the total number of dies on the wafer. In this case, the yield is given as 92%. To determine the number of good dies produced, we need to calculate 92% of the total number of dies.

The total number of dies produced is 25, we can calculate the number of good dies by multiplying 25 by the yield percentage.
92% can be expressed as a decimal by dividing it by 100, which gives us 0.92.

So, to find the number of good dies, we multiply 25 by 0.92:
25 * 0.92 = 23

Therefore, the silicon wafer produced 23 good dies.

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The silicon wafer produced 23 good dies which has a yield of 92% and produced 25 dies.

The yield of a silicon wafer refers to the percentage of good dies produced out of the total number of dies on the wafer. In this case, the yield is given as 92%. To determine the number of good dies produced, we need to calculate 92% of the total number of dies.

The total number of dies produced is 25, we can calculate the number of good dies by multiplying 25 by the yield percentage.

92% can be expressed as a decimal by dividing it by 100, which gives us 0.92.

So, to find the number of good dies, we multiply 25 by 0.92:

25 * 0.92 = 23

Therefore, the silicon wafer produced 23 good dies.

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The percentage composition of aluminium sulfide can be calculated by determining the relative mass of each element in the compound and expressing it as a percentage of the total mass.

Aluminium sulfide has the chemical formula Al2S3, which means it contains 2 atoms of aluminium and 3 atoms of sulfur.

To calculate the percentage composition of aluminium sulfide, we need to first determine the atomic mass of each element. The atomic mass of aluminum is 26.98 g/mol, and the atomic mass of sulfur is 32.06 g/mol.

The total molar mass of aluminium sulfide can be calculated by adding the molar mass of aluminum (26.98 x 2 = 53.96) to the molar mass of sulfur (32.06 x 3 = 96.18), giving a total molar mass of 150.14 g/mol.

Next, we can calculate the percentage composition of each element by dividing its mass by the total molar mass and multiplying by 100.

For aluminum:
(53.96 g/mol ÷ 150.14 g/mol) x 100 = 35.94%

For sulfur:
(96.18 g/mol ÷ 150.14 g/mol) x 100 = 64.06%

Therefore, the percentage composition of aluminum sulfide is 35.94% aluminum and 64.06% sulfur.


Calculating the percentage composition of a compound involves determining the relative mass of each element in the compound and expressing it as a percentage of the total mass. In this case, we used the chemical formula for aluminum sulfide and the atomic masses of aluminum and sulfur to determine the total molar mass of the compound. We then divided the mass of each element by the total molar mass and multiplied by 100 to get the percentage composition. This calculation is useful in determining the properties and behavior of a compound, as well as in predicting the outcome of chemical reactions involving the compound.

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