flag calculate the ph of a solution that is made by combining 55 ml of 0.060 m hydrofluoric acid with 125 ml of 0.120 m sodium fluoride.

Answer:

Non point source pollution

Explanation:

Point source pollution is when any contaminant enter the environment from an easily from an easily identified and confined place.

Non point source pollution is pollutants released in a wide space. Including oil, grease, and toxic chemicals.  

Answer: A sea of electrons

Explanation:

Answer: With the portion of hydrogen, all atoms have three parts. The parts of an atom are protons, electrons, and neutrons. A proton is accurately charged and is located in the center or nucleus of the atom. Electrons are negatively charged and are located in rings or orbits spinning around the nucleus.

Explanation: I hope this was helpful.

Answer: I think this one is the boiling water

sorry if wrong

Explanation:

Answer:

2.1 moles of water formed.

Explanation:

Given data:

Moles of water formed = ?

Moles of Ni(OH) = 4.20 mol

Solution:

Chemical equation:

2Ni(OH)    →  Ni₂O + H₂O

Now we will compare the moles of Ni(OH)  with water.

             Ni(OH)           :            H₂O

                2                 :              1

              4.20             :            1/2×4.20 = 2.1 mol

2.1 moles of water formed.

the answer is ultraviolet

Answer:

microwave

Explanation:

your gonna have one crispy plant if you put it in the microwave XD

Answer:

Mechanical energy is energy that results from movement or the location of an object. Mechanical energy is the sum of kinetic energy and potential energy.

Explanation:

Nuclear energy is energy resulting from changes in the atomic nuclei or from nuclear reactions.

Example: Nuclear fission, nuclear fusion, and nuclear decay are examples of nuclear energy. An atomic detonation or power from a nuclear plant are specific examples of this type of energy.

Answer:

The discovery of optics gave scientists instruments such as microscopes and telescopes.

Explanation:

The period between the 16th-8th century was called the period of the scientific revolution. At this time, the foundations  of our modern science was laid.

One of the characteristic of this period was the emphasis on the scientific method which upheld results from reproducible experiments.

Nicolaus Copernicus, Francis Bacon and Isaac Newton were leading names in this period.

It was within this period that the discovery of optics gave scientists instruments such as microscopes and telescopes and scientific  examination of the celestial bodies was launched.

Answer:

Paddy

Explanation:

he word paddy is used to describe an artificial pond with raised edges which are used for agriculture.

The word describes an artificial pond with raised edges used for agriculture is paddy. Therefore, option B is correct.

Seldom do artificial ponds have a natural outflow and entrance. This indicates that they only get fresh water from rain and direct activity, such a partial water change.

Ponds have a variety of functions, including providing water for farming and livestock, assisting in habitat restoration, acting as fish hatcheries, being parts of landscape architecture.

The paddy ponds are man-made ponds with elevated sides that are utilised for agriculture. These ponds are primarily used to easily supply crops with a suitable amount of water. These ponds are kept full of water, and rainwater is also collected and stored there.

Thus, option B is correct.

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Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

Answer:

zince hypohlorite

Explanation:

Answer:

Zince Hypohlorite

There are 20 grams of Sodium hydroxide in a molar solution that has a volume of 500 cm3.

Caustic soda and lye are two other names for sodium hydroxide. It is a typical component of soaps and cleansers. Sodium hydroxide seems to be a white, unscented solid at room temperature. Sodium hydroxide is a colorless, odorless liquid. Strong acids and water can cause explosive reactions with it.

Molarity is calculated by

moles (solute) / volume of solution in L

No. of moles = mass / molar mass

We have to find mass of sodium hydroxide (NaOH)

As we know, in 1 L (1000 cm³) of molar solution there is 40 gram of NaOH present.

From using this statement, 500 cm³ of a molar solution, means half liter of a molar solution contain -

= 40 / 2

= 20 gram of NaOH.

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Answer:

Explanation:

For amount of radiation from a hot body there is Stefan's Boltzman's law which is given below .

E = e σ T⁴

E is amount emitted , e is emissivity , σ is stefan's constant = 5.67 X 10⁻⁸ W / m² . for earth e =.85 approx

E = .85 x 5.67 X 10⁻⁸ x T⁴

604 = .85 x 5.67 X 10⁻⁸ x T⁴

604 = 4.82 x 10⁻⁸ T⁴

T⁴ = 125.31 x 10⁸

T =  3.3457 x 10²

= 334.57K

Temperature in Celsius = 334.57 - 273

= 61.57 Celsius .

Answer:  chemical formula

Explanation:

Hello!

Answer:

Chemical Formula

Explanation:

Chemical formula best describes this because it includes both the types of atoms and the number of each atoms.

Subscript is incorrect because 1) it's a component of a chemical formula and 2) it only describes the number of atoms for a specific element

Coefficient number is also incorrect

Chemical equation is incorrect because it is a symbolic representation of what happens in a chemical reaction.

The law of conservation of mass is directly represented in a balanced chemical equation.

In chemistry, the law of conservation of mass says that in a closed or isolated system, matter cannot be created or destroyed in a chemical reaction.

For example: If we burn wood, the mass of ashes and gases is equal to the mass of wood before burning.

Thus, the Law of conservation of mass represent a balanced chemical equation.

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Answer:

Diboron tetrachloride --->  B2Cl4

Answer:

It picked out for the best time for man to the earth for the earth and the earth in the moon to moon earth earth moon earth and moon earth moon and moon earth lord earth moon earth lord moon earth moon and earth moon earth lord lord moon earth moon lord moon earth lord moon lord

Explanation:

Explanation:

:Financial crunch in academia.

:Poor study design in published papers.

:Lack of replication studies.

:Problems with peer review.

:The problem of research accessibility.

:Lack of adequate and accurate science communication.

The approximate focal length of an objective lens is 8.42 mm.

The magnification of eye piece (m1)=10

Total magnification (m)=200

using,

m=m1*m2

200=10*m2

m2=20

Thus, magnification of objective lens=20

Using the formula for magnification of objective lens,

m2=1+L/f

20=1+0.16/f

f=0.16/19

=0.00842 m

8.42 mm

Therefore, the focal length is 8.42 mm.

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The first-order reaction will take approximately 2.31 minutes for the reactant concentration to decrease from 0.14 M to 0.07 M.

To determine the time it will take for a reactant concentration to decrease from 0.14 M to 0.07 M in a first-order reaction with a rate constant of \(0.547 min^{-1}\) , we can use the first-order reaction equation:

\(\frac{ln[A]}{[A₀}\) = -kt

Where [A] is the final concentration, [A₀] is the initial concentration, k is the rate constant, and t is the time.

Rearranging the equation, we have:

t = -ln([A]/[A₀]) / k

Substituting the given values, we have:

\(t =\frac{-ln(0.07/0.14)}{0.547}\\t = \frac{-ln(0.5)}{0.547}\)

Using natural logarithm ln(0.5) ≈ -0.693, we can calculate:

\(t = \frac{-(-0.693)}{0.547} \\t = \frac{1.267 }{0.547}\)

t ≈ 2.31 minutes

Therefore, it will take approximately 2.31 minutes for the reactant concentration to decrease.

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Answer:

First you must the balanced equation. 
2NaOH+H2SO4 → 2H2O+Na2SO4

From this you can see that it takes 2 moles NaOH per 1 mole H2SO4. Moles H2SO4 = 2.0 mol/L x 0.1 L = 0.2 moles.

Moles NaOH needed = 2 x 0.2 = 0.4 molesVolume NaOH = (x L)(1.0 mol/L) = 0.4 molesx = 0.4 liters = 400 ml NaOH

Explanation:

Answer:

B and I think A but you may want a secon opinion on that

Explanation:

I know that electrons are shared with covalent bonds so I assume the 2 answers are the ones with electrons it them

Sulfur (S) and oxygen (O) are both elements in Group 16 (formerly Group VI A) of the periodic table. This group is often referred to as the oxygen group or chalcogens. Oxygen is highly electronegative, meaning it has a strong tendency to attract electrons towards itself when it forms chemical bonds.

Water molecules are highly polar due to the significant electronegativity difference between oxygen and hydrogen. The oxygen atom in water pulls electrons towards itself, creating a partial negative charge (δ-) on the oxygen and partial positive charges (δ+) on the hydrogen atoms. This polarity allows water molecules to form hydrogen bonds with each other, resulting in strong intermolecular forces.

The stronger intermolecular forces in water due to hydrogen bonding result in higher boiling and melting points compared to hydrogen sulfide. Water is a universal solvent due to its high polarity and ability to form hydrogen bonds. Many substances dissolve well in water. Hydrogen sulfide, although less polar and with weaker intermolecular forces, is still somewhat soluble in water, resulting in a weak acid known as hydrosulfuric acid.

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Answer:

387.62, 83.33%

Explanation:

Given:

\(C_{12} H_{22} O_{11}(aq) + H_2O(g) -4 C_2H_5OH(1) + 4 CO_2(g)\)

720g of Sucrose produces 323g ethanol.

To calculate the theoretical yield, you can use a mole-to-mole ratio. Assuming that there is excess H2O, you can calculate the theoretical yield like so:

\(720g C_{12}H_{22}O_{11}*\frac{1 mol C_{12}H_{22}O_{11}}{342.3g} *\frac{4mol C_2H_5OH}{1mol C_{12}H_{22}O_{11}} *\frac{46.07g}{1molC_2H_5OH} =387.62g\)

An easy way to find percent yield is

\(\frac{Actual }{Theoretical} *100\)

So, plug the numbers in.

\(\frac{323.0}{387.62} *100 = 83.33%\)

So, the percent yield is 83.33%.

Answer:Attemted Failed

Maybe try to search

In a different way like:

what is the ingredient of cake

Instead of

how to make Cake

Answer:

About 277 Kelvin

Explanation:

Take the celcius, and add 273.15 to it

4°C + 273.15 = 277.15K

And round the answer to the nearest whole

277.15K ≈ 277K

Answer:

you would expect 0 radioactive nuclei to be present

Explanation:

got it right on the assignment

Answer:

Redox reactions are involved in the extraction of metals from their ores, eg extracting iron by reduction within the blast furnace. Transition metals have high melting points and densities, form coloured compounds and act as catalysts

Answer:

The answer is mass

Explanation:

Because mass is an extensive property of matter