a buffer solution is 0.470 m in a weak acid (a=1.8×10−6) and 0.210 m in its conjugate base, what is the ph?

The instrument with the greatest precision for measuring volume among the options provided is the 10 mL volumetric pipet.

The precision of an instrument refers to its ability to provide measurements with a high level of accuracy and reproducibility. In the context of measuring volume, precision is determined by the smallest increment or division on the scale of the instrument.

Among the options given, the 10 mL volumetric pipet typically offers the highest precision. Volumetric pipets are designed to deliver a specific volume accurately.

They have a single calibration mark at the top, indicating the desired volume, and are constructed to provide precise and accurate measurements.

On the other hand, graduated cylinders and graduated pipets have graduations marked along their length, allowing for approximate volume measurements but with lower precision compared to volumetric pipets.

The 10 mL graduated cylinder and 50 mL graduated cylinder have larger volume ranges and therefore larger increments between graduations, resulting in lower precision.

Similarly, the 50 mL buret is primarily used for precise dispensing of liquid in titration experiments and may have larger graduations compared to the 10 mL volumetric pipet.

In summary, the 10 mL volumetric pipet is typically the instrument with the greatest precision for measuring volume among the options provided.

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Answer:

resend again that question dear

Answer:

the answer is pain relievers

Which is composed of aromatic hydrocarbons?

clothing

barbeque fuel

pain relievers

polyvinyl chloride

Pain relievers are composed of aromatic hydrocarbons. Therefore, option C is correct.

Hydrocarbons with delocalized pi electrons and sigma bonds between their carbon atoms are known as aromatic hydrocarbons. One example is benzene. Since they smell, they are said to as aromatic.

One aromatic ring makes up monocyclic aromatic hydrocarbons (MAHs). The well-known environmental contaminants benzene, toluene, ethylbenzene, and xylenes are among the most combustible and water-soluble aromatic hydrocarbons (BTEX).

The typical aromatic parent structure is benzene. When the benzene ring is a substituent, it is referred to as a phenyl group.

Thus, Pain relievers are make up of aromatic hydrocarbons, option C is correct.

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According to the question the approximate ionization energy for the ground state of lithium is 30.6 eV.

The ionization energy for a hydrogen atom is 13.6 eV. To approximate the ionization energy for the ground state of lithium (Li), we can use the formula:
Ionization energy = (Z² * 13.6 eV) / n²
where Z is the atomic number and n is the principal quantum number. For lithium, Z = 3 and n = 2 (since it is in the second energy level).
Ionization energy = (3² * 13.6 eV) / 2² = (9 * 13.6 eV) / 4 ≈ 30.6 eV
So, the approximate ionization energy for the ground state of lithium is 30.6 eV.

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The number of valence electrons found in an atom of group i through viii is equal to eight minus the group number.

Valence electrons are the outermost electrons in an atom that are involved in chemical bonding.

In an atom, the valence electrons are located in the outermost energy level.

These electrons are critical because they interact with other atoms' electrons to form chemical bonds.

For each group in the periodic table, the number of valence electrons present is determined by the group number.

The group number equals the number of valence electrons.

The valence electrons in the outermost shell of an atom are the same as the group number.

The group number for groups I through VIII is one to eight, respectively.

Hence, the number of valence electrons found in an atom of group I through VIII is equal to eight minus the group number.

Answer: The number of valence electrons found in an atom of group i through viii is equal to eight minus the group number.

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Answer:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

Explanation:

This question involves balancing the above equation. An equation is said to be BALANCED when all the atoms of each element in the reactant side equates that in the product side.

According to this question, a chemical reaction is given as follows: SiO2 + CaC2 = Si + CaO + CO2. Based on observation, the atoms of elements are Silicon, oxygen, calcium and carbon are not the same on the reactants and products side. Based on this, the balanced equation is:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

The volume of pycnometer is 20.409 ml.

Volume of pycnometer is determined by using the general formula of  density which is,

density=mass/volume

Considering the data given, mass of pycnometer =27.144 g

According to the standards , density of pycnometer at 25°C=1.33g/cm³

Substituting the values in the formula,

volume=mass /density=27.144/1.33=20.409 cm³

Pycnometer is an instrument which is used to measure the relative density of liquids and solids.The density of liquids is determined by using relative density and for solids the density is determined by weighing them.

It is based on Boyle's law which helps in determination of pressure-volume relationship. There are 2 types of this instrument ,one that which works on a basis of gas expansion and the  other one which works on the basis of variable  volume.

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0.4645 moles of carbon dioxide are produced when 18.6 g of HF are reacted with an excess amount of sodium carbonate.

To answer this question, we first need to write out the balanced chemical equation for the reaction between HF and sodium carbonate:
2HF + Na₂CO₃ -> 2NaF + CO₂ + H₂O
From this equation, we can see that for every 2 moles of HF that react, 1 mole of CO₂ is produced.
To determine the number of moles of HF in 18.6 g, we need to use the molar mass of HF, which is 20.01 g/mol:
moles of HF = mass / molar mass = 18.6 g / 20.01 g/mol = 0.929 moles
Since there is an excess amount of sodium carbonate, all of the HF will be consumed in the pressure reaction, so we can use the ratio of 2 moles HF to 1 mole CO₂ to calculate the number of moles of carbon dioxide produced:
moles of CO₂ = 0.929 moles HF x (1 mole CO₂ / 2 moles HF) = 0.4645 moles

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The mass of hydrofluoric acid contained in the sample is approximately 0.1876 g.

To find the mass of hydrofluoric acid (HF) in the sample, follow these steps:

1. Write the balanced chemical equation for the reaction:
 \(HF + NaOH → NaF + H2O\)

2. Determine the moles of sodium hydroxide (NaOH) used in the titration:
  \(Moles of NaOH = Volume (L) × Molarity\)
 \(Moles of NaOH = 25.21 mL × (1 L/1000 mL) × 0.372 M\)
 \(Moles of NaOH = 0.00937692 mol\)

3. Determine the moles of hydrofluoric acid (HF) using the stoichiometry from the balanced equation:
  \(Moles of HF = Moles of NaOH (1 mol HF / 1 mol NaOH)\)
 \(Moles of HF = 0.00937692 mol\)

4. Determine the molar mass of hydrofluoric acid (HF):
  \(Molar mass of HF = 1(1.01 g/mol H) + 1(19.00 g/mol F) = 20.01 g/mol\)

5. Calculate the mass of hydrofluoric acid (HF) in the sample:
  Mass of HF = Moles of HF × Molar mass of HF
 \(Mass of HF = 0.00937692 mol × 20.01 g/mol\)
  \(Mass of HF = 0.1876 g\)

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Answer:

8.73

Explanation:

when you are adding or subtracting numbers, the sigfig (significant figure) is based on how many numbers after the decimal. with this info, we can see that 15.67 has 2 sigfigs and 6.943 has 3 sigfigs. when you subtract normally, you would get 8.727, which has 3 sigfigs, so you would round the last 7 up to get 8.73 with 2 sigfigs!

also it is to 2 sigfigs because we know that we go by the least number of sigfigs. hope this helped!

The A in the diagram indicates +VE. The correct option is A.

What is enthalpy?

Enthalpy is the result of the pressure, volume, and internal energy of the system added together.

The graphic shows that the enthalpy of the products is higher than the enthalpy of the reactants, proving that Hrxn is positive as shown in the previous response.

The difference between the total enthalpy (heat content) of the products of a reaction and the total enthalpy (heat content) of the reactants in that reaction is used to find out the enthalpy of the reaction (Hrxn).

Thus, the correct option is A. +VE.

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Answer:

Calcium nitrate is soluble in water and dissociate into ions whereas calcium carbonate is insoluble and water and do not form ions.

Explanation:

An electrolyte is a substance which conducts electricity in molten form or when dissolved in water.

The ability of an electrolyte to conduct electricity is due the movement of charged particles called ions. The ions are of two types: negatively charged ions called anions and positively charged ions called cations.

Calcium nitrate is a soluble in water, and when dissolved in water produces two ions; negatively charged nitrate ions,NO₃⁻, and positively charged calcium ions, Ca²⁺. These ions enable it to conduct electricity.

Calcium carbonate on the other hand is insoluble in water, and thus, do not produces any ions capable of carrying current.

Answer:

someone know it?

Explanation:

Answer:

Aqua regia is a corrosive, fuming yellow solution that is a 1:3 mixture of concentrated nitric and hydrochloric acids.

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability of aqua regia to dissolve the noble metals gold, platinum, and palladium.

Answer:The model states that electrons in atoms move in circular orbits around a central nucleus and can only orbit stably in certain fixed circular orbits at a discrete set of distances from the nucleus. These orbits are associated with definite energies and are also called energy shells or energy levels.

bohrs model and other models are really hard to understand but i hope this will help you!

When a cold front and a warm front collide, it is called an occluded front. This weather phenomenon occurs when a cold front catches up to and overtakes a slower-moving warm front, pushing it upwards.

As the two fronts meet, the warm air is lifted, causing it to cool and condense, leading to the formation of clouds and precipitation. The type of precipitation that occurs during an occluded front can vary depending on the temperature and moisture content of the air masses involved. Generally, it is common to see rain or snowfall during an occluded front, and the intensity of the precipitation can be moderate to heavy. During an occluded front, the temperature can also change rapidly as the warm air mass is lifted and replaced by cooler air. If the air behind the occluded front is colder than the air ahead of it, the temperature will drop, leading to a sudden chill. However, if the air behind the occluded front is warmer, the temperature will rise, creating a sudden warmth.
In conclusion, an occluded front is a weather phenomenon that occurs when a cold front overtakes and lifts a slower-moving warm front, resulting in precipitation and sudden temperature changes. It is a unique weather event that requires careful monitoring by meteorologists to ensure the safety of people and property.

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A nephron is the basic functional unit of the kidney that removes waste and additional substances from the blood. It is a long, convoluted tube that extends from the Bowman's capsule to the collecting duct. The correct option in the given question is (a) Proximal convoluted tubule.

The function of the nephron is to filter blood and to create urine. The following are the different regions of a nephron:

Water is actively transported in the proximal convoluted tubule. In this region, water and solutes are reabsorbed from the tubular lumen back into the peritubular capillary network. Water is also passively reabsorbed in the descending limb of the nephron loop. Hence, a is the correct option.

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Water is actively transported in the proximal convoluted tubule. This statement is true regarding the transport of water and the region of the nephron.  Approximately 65 percent of the filtrate is reabsorbed in the proximal convoluted tubule. Therefore, the correct option among the given choices is (a) Proximal convoluted tubule.

A nephron is water actively transported. It is a part of the kidney, specifically the renal tubule, that helps in filtering blood, reabsorbing essential elements, and excreting the waste in the form of urine.

Regions of the nephron include the following:

Proximal convoluted tubule (PCT)

Loop of Henle

Distal convoluted tubule (DCT)

Collecting duct

In the proximal convoluted tubule, water is reabsorbed by osmosis. Na+ ions and other substances are reabsorbed actively, making the environment of the filtrate hypotonic to blood. As a result, water moves passively from the proximal convoluted tubule to the capillaries. Approximately 65 percent of the filtrate is reabsorbed in the proximal convoluted tubule. Therefore, the correct option among the given choices is (a) Proximal convoluted tubule.

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In rhodochrosite, the carbonate ion has a 2- charge and there is only one manganese ion, the manganese ion must have a 2+ charge to balance the overall charge of the compound. So, each manganese atom has lost two electrons.

To determine the number of electrons that each manganese (Mn) atom has lost in the compound rhodochrosite (MnCO₃), we need to consider the oxidation states of the elements involved.

In rhodochrosite, the carbonate ion (CO₃) has a charge of -2 since carbonate is a polyatomic ion with a 2- charge.

The overall charge of the rhodochrosite compound must be neutral, so the manganese ion (Mn) must have a positive charge to balance the negative charge of the carbonate ion.

To find the charge on the manganese ion, we can use the known charge of the carbonate ion and the formula of the compound. The formula MnCO₃ indicates that there is one manganese ion in the compound.

Since there is just one manganese ion and the carbonate ion has a 2-charge, the manganese ion needs a 2+ charge to balance the compound's overall charge.

To achieve a 2+ charge, each manganese atom must lose two electrons.

Therefore, each manganese atom in rhodochrosite has lost two electrons.

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Complete question:

Ores of manganese. Mn. sometimes contain the mineral rhodochrosite. MnCO₃, which is an ionic compound of manganese ions and carbonate ions Part A How me Expres How many electrons has each manganese atom lost to make this compound? Express your answer as an integer. νΠΠΑΣ N = electrons.

Answer:

milk sugar, salts, substances with fatlike properties, and gases

Explanation:

The current study presents a method for automating the Koppen–Garcia climate classification using a GIS module. This method was then applied in a case study of the Lerma-Chapala-Santiago watershed to compare time series data on climate from 1960 to 1989, 1981 to 2010, and 1960 to 2010. The kappa statistic indicated that the climate classifications of the generated model had a perfect degree of agreement with those of a prior nonautomated study. The climate data from the period 1960 to 2010 were used to create a climate map for the watershed. Overall, the dominant climates were dry, semiarid, temperate, and semiwarm temperate with a summer rainfall pattern. A comparative analysis of climate behavior between 1960 and 1989 and between 1981 and 2010 showed changes in temperature and extreme temperatures over 13.6% and 9.9%, respectively, of the watershed; the presence or absence of mid-summer drought also changed over 0.8% of the watershed. The module developed herein can be used to classify climates across all of Mexico, and data of varying spatial resolution and coverage can be inputted to the module. Finally, this module can be used to automate the creation of climate maps or to update climate maps at diverse spatial-temporal scales.

The galaxy includes all of the following - dark matter, planets, stars and interstellar gas dust.

Galaxy is a massive accumulation of gas, dust, and countless stars and solar systems. Gravity holds a galaxy together.  You see other stars in the Milky Way when you look up at the stars in the night sky. A galaxy is made up of four main parts: the disc, which may contain spiral arms, the halo, the central bulge, and the black hole at its centre. The spherical component is the collective name for the halo and the central bulge. The galaxy includes all of the following - dark matter, planets, stars and interstellar gas dust.

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The galaxy contains all of the following: interstellar gas dust, planets, stars, and dark matter.

A galaxy is a vast collection of stars, solar systems, and a great deal of gas and dust. A galaxy is held together by gravity. When you look up at the stars in the night sky, you can see other stars in the Milky Way. The disc, which could have spiral arms, the halo, the central bulge, and the black hole in the centre of the galaxy are the four main components. The halo and the central bulge are referred to as the spherical component collectively. The galaxy contains all of the following: interstellar gas dust, planets, stars, and dark matter.

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Answer:

the blue wale is more different than the others

it states that its order is cetacea while the others are carnivora  

the family is also different

so is the genus and and species so there are 4 differences in the blue wale while the others have only 2 to 3

Explanation:hope dis help

Answer:

1.02 × 10⁻³ g

Explanation:

Step 1: Given data

Number of moles of titanium (IV) oxide in 1 jelly bean (n): 1.28 × 10⁻⁵ moles

Step 2: Calculate the mass (in grams) corresponding to 1.28 × 10⁻⁵ moles of TiO₂

To convert moles to mass, we need a conversion factor. In this case, it is the molar mass of TiO₂: 79.87 g/mol.

1.28 × 10⁻⁵ mol TiO₂ × 79.87 g TiO₂/1 mol TiO₂ = 1.02 × 10⁻³ g TiO₂

Answer:

2Li + ZnBr2 ->2LiBr + Zn

3Ca + Al2O3 ->2Al + 3CaO

Explanation:

Spontaneous reactions are reactions that can happen on their own. For a spontaneous reaction to occur, a metal that is higher in the activity series must displace a metal that is lower in the activity series from its solution and not vice versa.

If we look at the two reactions selected in the answer, lithium is above zinc in the activity series and calcium is above aluminum in the activity series hence the two reactions occur spontaneously.

Answer: For the given reaction-

Explanation:

For example, Tin + silver nitrate = tin (IV) nitrate + silver

The 'equal to' symbol denotes a forward arrow.

For example, \(Sn + AgNO_{3} \rightarrow N_{4}O_{12}Sn + Ag\)

 \(Sn(s) + 4AgNO_{3}(aq) \rightarrow N_{4}O_{12}Sn(aq) + 4Ag(s)\)

Answer:

Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen.

Explanation: