A buffer solution is composed of 9.00 mol of acid and 4.75 mol of the conjugate base. if the pa of the acid is 2.40 , what is the ph of the buffer?

Answer:

29.25g

Explanation:

Number of moles = Mass / Molar mass

Number of moles of NaOH = 20g/(23 + 16 + 1)

= 0.5mol

1 mol of NaOH = 1 mol of NaCl

Therefore, 0.5mol of NaOH = 0.5mol of NaCl

0.5mol = Mass of NaCl / (23 + 35.5)

Mass = 0.5 × 58.5

= 29.25g

I hope this helps! ^^

The volume measurements won't be accurate and will be either less than or more than the anticipated figure if the graduated cylinder is accurately calibrated (depending on if the error in calibration is higher or lower). Depending on the calibration error, the calculated value may be higher or lower than the real value.

What is calibration?

Setting up an instrument so that it can generate findings for samples that fall within a tolerable range is part of the calibration process. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.

Calibration attempts to reduce any measurement uncertainty by confirming the precision of test apparatus. In measuring procedures, calibration quantifies and reduces mistakes or uncertainties to a manageable level.

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8.21g of KMnO₄ correspond to 3.13 x 10²² formula units of KMnO₄? avogadro' s number is 6.022 x 10²³

Here,3.13 x 10²² formula units of KMnO₄=1 mole of KMnO₄/avagadro no

1 mole of KMnO₄/6.022 x 10²³

= 3.13 x 10²²/6.022 x 10²³

= 5.197moles of KMnO₄

Now KMnO₄ has molar mass is 158.034g/mol

5.197moles of KMnO₄=158.034/1 mole of KMnO₄

158.034×5.197=821.1g of KMnO₄

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Answer:

60 N.

Explanation:

The force formula of acting on an object is F=ma.

This means that...

F= force

M - mass

A = acceleration

So to solve this you have to solve for F.

F=ma

F=(20kg)(3m/s^2)

F= 60 N.

I hope this helps, have a good day! :D

Answer:

1600 mm to m = 1.6 meters

Explanation:

The table is based on the periodic table and is to be filled by finding out various elements of periodic table

Disclaimer:

The table given below is not clear and hence only general idea can be provided

The table is based on the idea of periodic table where various constituents such as mass number, overall charge , total particles, number of protons have been asked to be labelled.

Sodium has been solved as an example and various postulates of Cu is being provided to solve accordingly

In the constituents of element Cu

Name- Cuprous and Cupric

Atomic number-29

Mass number-63

overall charge-+2 for Cuprous and +3 for Cupric

Total particles in nucleus-63

number of protons -29

number of neutrons-34

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When placed inside of a magnetic field, the magnetic field that electrons generate aligns in the opposite direction of the applied magnetic field.

Magnetic fields are used in all modern technology, especially in electrical engineering and electromechanics. Rotating magnetic fields are used in both electric motors and generators. Magnetic field interactions in electrical devices such as transformers are conceptualized and studied as magnetic circuits. Magnetic forces use the Hall effect to provide information about charge carriers within a material.

The Earth creates its own magnetic field, which protects the Earth's ozone layer from the solar wind and is important for navigating with a compass. Magnetism is a class of physical properties imparted by magnetic fields and refers to the ability to induce attractive and repulsive phenomena in other entities.

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the mass percent is 45.67%

The mass percentage of a solution is calculated as the solute concentration in grams per 100 g of the solution.

Given that 39.5 g of water dissolves 33.2 g of ammonium carbonate.

∴

Mass of the solution is (33.2+39.5) g = 72.7 g

So, the solution of 72.7 g includes 33.2 g of ammonium carbonate.

So 100 g solution contains

33.2/72.7×100≈45.67 g ammonium carbonate

Thus the mass percentage of the solution is 45.67%

One approach to show the concentration of an element in a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total mass of the combination by the mass of each component and multiplying the result by 100%.

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Answer:

The logs are the input and the flames are the output

Explanation

When two protons are extremely close to each other, there is a strong nuclear force between them.

The force between a proton and neutron is same as the force between two proton, which the nuclear force. Nuclear forces can also be called as the nuclear interactions. Nuclear forces affects the neutrons and protons, both nucleons in identical or similar way.

Strong nuclear force is one of the fundamental forces of the nature and it is strongest among the four. Four fundamental forces are -Gravitation, strong nuclear force, weak nuclear force, and electromagnetism.

The energy that is used in nuclear power and nuclear weapons, the nuclear force has an important role in storing it. To bring the charged protons together against their electric repulsion, energy is required. When the protons and neutrons are bound together by the nuclear force they form a nucleus, this energy is in stored form.

So, the strong forces holding two protons extremely close is strong nuclear forces.

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This has become common practice, in my opinion, since scientists need to exchange ideas.

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Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the  absolute pressure in the chamber and express is 57kpa

Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure

Here to find absolute pressure atmospheric pressure=92kpa and  vacuum gage=35 kpa                                      

Pabsolute pressure=Patmospehric pressure - Pvaccume

92-35=57kpa

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Answer:

pick it up with tongs

Explanation:

The gas must be heated to a final temperature of 137°C in order to fill a volume of 557 ml.

Given,V₁= 371mlV₂ = 557 mlT₁ = 0°C or 273 K

The final gas temperature that has to be heated must be determined.

As long as the cylinder is free to move, the pressure is always 1 atm, or equal to the external pressure.

Consequently, by using Charles Law, we obtain

V₁ / T₁ = V₂ / T₂

where starting and ultimate volumes V1 and V2, respectively T1 and T2 are beginning and ultimate temperatures, respectively (in Kelvin).

The ultimate temperature is as a result

T₂ = V₂ × T₁ / V₁Or, T₂ = 557 x (0+273) / 371Or, T₂ = 410 KOr, T₂ = 137°C.

As a result, the temperature is 137°C at the end.

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The main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.

In toxicology, synergism refers to the effect caused when exposure to two or more chemicals at one time results in health effects that are greater than the sum of the effects of the individual chemicals.

What are vitamins?

Therefore, the main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.

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A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it Equatorial.

An atom is a single neutral particle. A molecule is a neutral particle with two or more atoms bonded together. Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. The bond is a polar covalent bond (polar bond) due to the high electronegativity of the oxygen atom.

About 99% of the body consists of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. Something like table salt (NaCl) is a compound because it is made up of multiple elements (sodium and chlorine), but it is not a molecule because the bonds that hold NaCl together are ionic bonds.

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The molecular formula of a molecule that has an empirical formula of ch and its molar mass is known to be 26 g/mol is C₂H₂

The molecular formula of a compound is the total number of atoms present in a molecule of the compound.

The empirical formula of the molecule is the simplest whole number of atoms of a compound.

The empirical formula of the molecule is ch

The molar mass is 26 g/mol

So, the molecular formula will be C₂H₂ and the compound is acetylene. It is a hydrocarbon.

Thus, the molecular formula of the molecule is C₂H₂.

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The molecules in a sample of solid so2 are attracted to each other by a combination of London forces and dipole-dipole interactions.

Other names for London dispersion forces include dispersion forces, London forces, fluctuation induced dipole bonds, instantaneous dipole-induced dipole forces, and weakly van der Waals forces. Since the electrons are often arranged symmetrically with regard to the nucleus, they serve as a form of electrically symmetric force between atoms and molecules.

Dipole-dipole interactions, which result from the close association of induced or permanent dipoles, are weak interactions. Van der Waals interactions are the name given to these forces taken as a whole. These interactions are widespread in proteins and range widely in strength.

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By ideal gas approximation, the final pressure is 2.14 atm.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

V1 = 12.5 L

V2 = 29.3 L

P1 = 5.01 atm

When the initial and final temperature is the same, we can use the ratio of pressure and volume as

P1 . V1 = P2 . V2

5.01 . 12.5 = P2 . 29.3

P2 = 2.14 atm

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Using benzene density, the mass of benzene is 131.805 grams.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

ρ = 0.8787 g/mL

V = 0.15 L = 150 mL

By substituting the following parameters, we get

ρ = m / V

0.8787 = m / 150

m = 0.8787 . 150

m = 131.805 grams

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The percentage abundance of isotopes of gallium is 61.56% is Ga-70.92 & 38.44% is Ga-68.93.

Gallium (31Ga) is composed of two stable isotopes: gallium-69 and gallium-71. Gallium-67 and gallium-68 are the most commercially important radioisotopes.

Gallium-67 (half-life: 3.3 days) is a gamma-emitting isotope (the gamma ray emitted immediately after electron capture) that is used in standard nuclear medical imaging procedures known as gallium scans. It is most commonly used as the free ion, Ga3+. It is the gallium radioisotope with the longest half-life.

Gallium has two naturally occurring isotopes: Ga-69 (mass 68.9256 amu, natural abundance 60.11%), and Ga-71 (mass 70.9247 amu, natural abundance 39.89%).

Gallium's average atomic mass =[tex]\frac{68.9257 +70.9249}{2}[/tex]

=69.9253

Let x equal the percentage abundance of the first isotope.

by utilizing

AAM=[tex]\frac{W_{1}X_{1} * W_{2} X_{2} }{100}[/tex]

[tex]69.70 = \frac{70.925 *X +68.926 * (1-X)}{100}[/tex]

[tex]69.70 = 70.925X + 68.926 - 68.926 X[/tex]

x = 61.56%

61.56% is Ga-70.92. (100-61.56)

& 38.44% is Ga-68.93.

The percentage abundance of isotopes of gallium is 61.56% is Ga-70.92 & 38.44% is Ga-68.93.

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The electron configuration of ions derived by stable arrangement.

Their valence shell contains two or eight electrons. They don't acquire, shed, or distribute electrons.

An atom with a full outermost (valence) shell has a stable electrical configuration. The quantity of electrons that leave or enter an atom's outer shell is known as its valency.

A noble gas configuration is a stable electron configuration for representative or main group elements. By acquiring or losing electrons and forming ions, or by sharing electrons with other atoms, the representative elements' atoms can adopt a noble gas structure.

The stability of an electron arrangement can be predicted. When all of an atom's orbitals are filled, it is at its most stable and unreactive. The combinations with full energy levels are the most stable.

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Earth is made mostly of metals and rocks.  the elements (carbon, silicon, iron, etc.) that make up these materials form, and they were produced by nuclear fusion in stars.

Metals are materials that, when freshly worked, polished, or crushed, have a lustrous appearance and are relatively good conductors of electricity and heat. Metals are typically ductile and malleable. These properties are the result of metallic bonding between the atoms or molecules of the metal.

Metal is very useful material. Metals have many properties such as B. Strength, toughness, and stiffness. When heated, the metal can be shaped into anything from tiny paper clips to giant airplanes. It is also an excellent conductor of electricity and heat, making it useful for electricity and cooking pots.

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Spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration is true.

There are two examples of spontaneous movement: diffusion and osmosis.

Diffusion is spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration.

Osmosis is the spontaneous movement of solvent molecules (in this example water) through a selectively permeable membrane into a region of higher solute concentration (15 percent salt solution), in the direction that tends to equalize the solute concentrations on the two sides.

The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration.

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The anaerobic process of splitting glucose and forming two molecules of pyruvic acid is called 'glycolysis.'

The word glycolysis means 'glucose splitting' and this is what happens throughout the process.

During glycolysis, enzymes are used to split one molecule of glucose into two molecules of pyruvate (pyruvic acid).

This process produces end products which include two molecules of ATP and two molecules of NADPH as well as water.

As this is an 'anaerobic process' which means it doesn't need oxygen for the process.

The process of glycolysis also takes place inside the cytoplasm and occurs in both aerobic and non-aerobic organisms.

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On calculating using conversions, John can select either the package of wood with (a) 3 pieces of 2000mm each or the one with (d) 6 pieces of 100cm each.

On conversion of units from mm and cm to m:

1m = 100cm

1m = 1000mm

Therefore,

Since John requires 6m of wood to build a diving board, using unit conversions:

3 pieces of 2000mm each:

2000mm = 2m = 2m x 3 = 6m

4 pieces of 1.5 cm each:

1.5cm = 0.015m x 4 = 0.06m

6 pieces of 100 mm each:

100mm = 0.1m x 6 = 0.6m

6 pieces of 100 cm each:

100cm = 1m x 6 = 6m

8 pieces of 200 mm each:

200mm = 0.2m x 8 = 1.6m

Result:

The package with 3 pieces wood of 2000mm each equals to 6m of wood.

Similarly, the package with 6 pieces wood of 100cm each equals to 6m of wood.

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19 ml of a 5m solution of sodium borate must be added to a 200 ml solution of 50mm boric acid in order for the ph to be 9.6

Here pH=Pka-log[A]/[B]

= 9.6=9.24-log[A]/[B]

= log[A]/[B]=-0.36

Here for ml molarity formula is used

Molarity=mass/volume here mass of sodium borate is 381g/mol and volume of solution is 200ml

mass/volume=381/200=1.905/5.0×50=19ml

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The storage location of bile acids is the gall bladder.

Bile acids are made from cholesterol in the liver. Cholic acid  and chenodeoxycholic acid are the major bile acids.

These acids are very crucial for the digestion of dietary fats and fat-soluble vitamins(A, D, E, and K).

The bile that is secreted by the liver passes through the hepatic ducts and is stored and concentrated in a thin muscular sac called the gall bladder.  The bile then reaches the small intestine  where it acts upon the food and helps in its digestion.

Therefore, the instructor determines that the teaching was successful when the students identify the gall bladder as the storage location of bile acids.

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The names of the new substances formed are:

1) ammonium chloride (NH₄Cl)

2) Sodium chloride (NaCl)

3) Calcium chloride (CaCl₂) and carbon(IV) dioxide (CO₂)

1) Balanced chemical equation for reaction of ammonia (NH₃) and dilute hydrochloric acid (HCl):

HCl + NH₃ → NH₄Cl

2) Balanced chemical equation for reaction of sodium hydroxide (NaOH) and dilute hydrochloric acid:

HCl + NaOH →  NaCl + H₂O

3) Balanced chemical equation for reaction of calcium carbonate (CaCO₃) and dilute hydrochloric acid:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

These chemical reactions are double displacement reactions, cations and anions of the two reactants switch places and form two new compounds.

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