which of the following has the lowest conductivity? a. 0.1 m cuso4 b. 0.1 m koh c. 0.1 m bacl2 d. 0.1 m hf e. 0.1 m hno3

The purpose of standardization is to calibrate volume markings on a buret known reference value or concentration for a substance or instrument.

The process of standardization involves comparing the unknown value or concentration of a substance or instrument with a known standard value or concentration.

This process is critical in many scientific fields, including chemistry, biology, and engineering, as it ensures that measurements and analyses are accurate and reliable.

Standardization can also help to ensure consistency and comparability between different laboratories, instruments, or experiments.

Learn more about the standardization at

https://brainly.com/question/28347178

#SPJ4

Answer:

C. ATP.

Explanation:

During the process of aerobic cellular respiration, energy is said to be released in three main stages: glycolysis, Krebs cycle and oxidative phosphorylation (electron transport chain). The electron transport chain produces the most energy and it involves the transfer of electrons through series of complex proteins.

As the electrons move through the individual complexes, energy is lost to form a proton gradient (H+). The proton gradient powers the synthesis of ATP from ADP as catalyzed by ATP synthase.

Answer:

\(\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}\)

Explanation:

The molarity of a solution is the moles per liter. It is found using this formula:

\(M=\frac { moles \ of \ solute}{liters \ of \ solution}\)

First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.

\(\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}\)

Multiply by the given number of grams.

\(314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}\)

Flip the fraction so the grams of HBr cancel.

\(314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}\)

\(\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr\)

Now we know the moles, and can calculate the molarity.

There are 3.88703497714 moles of solute and 4.50 Liters of solution.

\(M= \frac {3.88703497714 \ mol }{ 4.50 \ L}\)

\(M= 0.863785550476 \ mol/ L\)

The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.

The 7 in the ten thousandth place tells us to round the 3 to a 4.

\(M \approx 0.864 \ mol/ L\)

\(M \approx 0.864 \ M \ HBr\)

The molarity of the solution is about 0.864 M HBr.

B. Moderate members of the Chinese Communist Party began to institute economic reforms.

After Mao Zedong's death in 1976, China experienced a significant change in direction. With the rise of Deng Xiaoping and the fall of the radical Cultural Revolution, moderate members of the Chinese Communist Party took control and implemented economic reforms.

These reforms, known as the "Four Modernizations," aimed to modernize China's agriculture, industry, science and technology, and defense. This shift towards a more market-oriented economy led to the opening up of China to foreign investment, the establishment of special economic zones, and the adoption of policies that encouraged private enterprise and international trade. This marked a departure from Mao's policies of centralized planning and collective agriculture.

To learn more about economic click here:

https://brainly.com/question/32863828

#SPJ11

The pH of the solution containing an amphetamine concentration of 219 mg/L is approximately 11.21.

To calculate the pH of a solution containing amphetamine, we first need to determine the concentration of hydroxide ions (OH-) in the solution. We can do this by using the p_Kb value and the concentration of amphetamine.

Given:

Amphetamine concentration = 219 mg/L

To convert the concentration from milligrams per liter (mg/L) to moles per liter (M), we need to know the molar mass of amphetamine. The molar mass of amphetamine (C9H13N) is calculated as follows:

C (carbon) = 12.01 g/mol x 9 = 108.09 g/mol

H (hydrogen) = 1.01 g/mol x 13 = 13.13 g/mol

N (nitrogen) = 14.01 g/mol x 1 = 14.01 g/mol

Total molar mass of amphetamine = 108.09 g/mol + 13.13 g/mol + 14.01 g/mol = 135.23 g/mol

Now, let's calculate the concentration of amphetamine in moles per liter (M):

Concentration (M) = (219 mg/L) / (135.23 g/mol)

= 1.62 mmol/L

= 1.62 x 10^-3 mol/L

Since amphetamine is a weak base, we can assume that most of it will react with water to produce hydroxide ions (OH-). This means that the concentration of hydroxide ions is equal to the concentration of amphetamine.

Concentration of hydroxide ions (OH-) = 1.62 x 10^-3 mol/L

Now we can calculate the pOH using the formula:

pOH = -log10 [OH-]

pOH = -log10 (1.62 x 10^-3)

= 2.79

To calculate the pH, we use the equation:

pH + pOH = 14

pH = 14 - pOH

= 14 - 2.79

= 11.21

Therefore, the pH of the solution containing an amphetamine concentration of 219 mg/L is approximately 11.21.

Learn more about amphetamine from the given link

https://brainly.com/question/14844601

#SPJ11

Answer:

Explanation:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Answer:

two

Explanation:

2

Answer:

two

Explanation:

nucleic acids are made up of chains of many repeating units called nucleotides. the dna molecule consists of two such chains that spiral around an imaginary axis to form a double helix (spiral.)

hope this helps :)

have a nice day !!

Answer: (2S,3S)-2-Bromo-3-phenylbutane will undergo E2 reaction and form trans product of elimination due to its thermodynamic stability

Explanation:

The age of a skeleton can be determined by measuring the amount of carbon-14 present in the remains. Carbon-14 is a radioactive isotope of carbon that undergoes decay over time. In this case, the skeleton has lost 19% of its carbon-14.
The decay rate, k, of carbon-14 is given as 0.01205% per year.

This means that each year, the amount of carbon-14 in the skeleton decreases by 0.01205% of the remaining amount.
To find the age of the skeleton, we can use the formula for exponential decay: N(t) = N0 * e^(-kt). Since we know that the skeleton has lost 19% of its carbon-14, the remaining amount is 100% - 19% = 81% of the initial amount. Therefore, N(t) = 0.81 * N0. Substituting these values into the formula, we have: 0.81 * N0 = N0 * e^(-0.01205t). Dividing both sides by N0, we get: 0.81 = e^(-0.01205t)

To solve for t, we take the natural logarithm (ln) of both sides: ln(0.81) = -0.01205t. Now we can solve for t: t = ln(0.81) / -0.01205. Using a calculator, we find that t is approximately 137.51 years. Therefore, the skeleton is estimated to be around 137.51 years old based on the 19% loss of carbon-14 and the given decay rate.

To know more about skeleton visit:

brainly.com/question/32952961

#SPJ11

Decreasing temperature would decrease the number of \(CO_2\)molecules in the solution and increase the number of \(CO_2\)molecules above the solution.

According to Henry's Law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. As the temperature decreases, the solubility of gases generally increases. In other words, at lower temperatures, gases tend to dissolve more readily in a liquid.

In the case of \(CO_2\), decreasing the temperature would cause a decrease in its solubility in the solution. As a result, some of the dissolved \(CO_2\)molecules would be released from the solution and escape into the gas phase above the solution. This increase in the number of \(CO_2\)molecules above the solution corresponds to the increase in the partial pressure of \(CO_2\).

Conversely, increasing the temperature would have the opposite effect. It would increase the solubility of \(CO_2\)in the solution, causing more \(CO_2\)molecules to dissolve and reducing the number of \(CO_2\)molecules above the solution.

This behavior can be observed in various everyday situations. For example, when a carbonated beverage is left out at room temperature, the drink goes flat over time as \(CO_2\)is released from the liquid into the atmosphere due to the decrease in solubility with increasing temperature.

For more such questions on temperature visit:

https://brainly.com/question/4735135

#SPJ8

Answer:

See the answer below

Explanation:

In chemistry, indicators are substances that are capable of changing colors with respect to the pH. Each indicator has its characteristic color in acidic pH and another characteristic color in alkaline pH.

Methyl orange indicator appears red in acidic solution and yellow in basic solutions. Phenolphthalein is usually colorless in acidic solutions and appears pink in basic solutions. A red litmus paper will turn blue in alkaline solutions while a blue litmus paper will turn red in acidic solutions.

Answer:

Neon is the most stable, fluorine and carbon too are stable

Explanation:

Answer:

Explanation:

Here, we want to get the value of the oxidation number of Z

Generally, hydrogen has an oxidation number of +1, while oxygen has an oxidation number of -2

The total oxidation number is zero

Thus:

The correct answer is B) SO₂ < CO₂ < C₁O₂ in order of increasing bond angle.

The bond angles in these molecules are determined by their molecular geometry, which is influenced by the number of electron groups (bonded atoms or lone pairs) around the central atom.

In SO₂, the central sulfur atom has three electron groups, giving it a bent shape with bond angles of approximately 119 degrees.

In CO₂, the central carbon atom has two electron groups, giving it a linear shape with bond angles of 180 degrees.

In C₁O₂, the central chlorine atom has four electron groups, giving it a tetrahedral shape with bond angles of approximately 109.5 degrees.

Therefore, the bond angles increase in the order of SO₂ < CO₂ < C₁O₂.

You can learn more about bond angles at: brainly.com/question/13751116

#SPJ11

1. To find the density of O2 at 42°C and 221.3 mmHg, we can use the ideal gas law,
PV = nRT,
where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. Rearranging the equation to solve for density,
we get:
Density = (n/V) = (P/RT)
Plugging in the given values and converting units as necessary:
Density = (221.3 mmHg / (62.36 L*mmHg/mol*K) * (315.15 K))
Density = 1.122 g/L
Therefore, the density of O2 at 42°C and 221.3 mmHg is 1.122 g/L.

2. To find the pressure of the mixture of gases in the 125 ml container, we can use Dalton's Law of Partial Pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas. The partial pressure of each gas can be found using the ideal gas law:
P1V1/T1 = P2V2/T2
For hydrogen gas:
(1.3 atm)(125 ml)/(296.15 K) = (P2)(125 ml)/(296.15 K)
P2 = 1.3 atm
For nitrogen gas:
(2.3 atm)(214 ml)/(296.15 K) = (P2)(125 ml)/(296.15 K)
P2 = 4.670 atm
The total pressure of the mixture of gases is:
Ptotal = P1 + P2 = 1.3 atm + 4.670 atm = 5.970 atm
Therefore, the pressure of the mixture of gases in the 125 ml container is 5.970 atm.

To know more about Pressure and Density refer here:

https://brainly.com/question/28828046

#SPJ11

Answer:

0.75 M

Explanation:

Molarity = moles of solute / liters of solution

so;

Molarity = \(\frac{1.5 Moles}{2.0 Liters}\)

According to molar concentration, the molarity of this solution is 0.75 molar.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula gives, molarity= 1.5/2=0.75 M

Thus,  the molarity of this solution is 0.75 molar.

Learn more about molar concentration,here:

https://brainly.com/question/15532279

#SPJ2

Answer:

the volume that the gas occupy at 7.47 atm is  0.1564 liters

Explanation:

The computation of the volume that the gas occupy at 7.47 atm is shown below:

As we know that

P1V1 = P2V2

Now

V2 = P1V1 ÷ P2

= 2.05 atm × 0.570 liters ÷ 7.47 atm

= 0.1564 liters

Hence, the volume that the gas occupy at 7.47 atm is  0.1564 liters

So the same would be considered and relevant

Answer:

below

Explanation:

1. The areas that have latitudes which are closer to the equator are generally hotter than those areas that are closer to the north and south poles.

2. Temperature is inversely related to latitude, as latitude increases from the equator (moving north or south) the temperature decreases.

Hope this helps! best of luck <3

(1) Fewer microorganisms will grow on the surface of the lake if iron compounds are added to a lake with an overabundance of nutrients. Hence, option 1 is correct.

(2) Fracking means using water and chemicals at high pressure to open up fissures to access oil and gas resources. Hence, option 2 is correct.

An organism that can be seen only through a microscope.

Iron is a natural capping agent which can enhance sediment P binding capacity, thus reducing P availability and shifting a lake from an algal to a macrophyte dominated state. Iron could, however, also impose toxic effects on the biota.

Fracking is the injection of a fluid at high pressure into an underground rock formation to open fissures and allow trapped gas or crude oil to flow through a pipe to a wellhead at the surface.

This technique is used in natural gas and petroleum production.

1) Fewer microorganisms will grow on the surface of the lake if iron compounds are added to a lake with an overabundance of nutrients. Hence, option 1 is correct.

(2) Fracking means using water and chemicals at high pressure to open up fissures to access oil and gas resources. Hence, option 2 is correct

Learn more about the microorganisms here:

https://brainly.com/question/6699104

#SPJ1

600grams of ping-pong balls is equal to 0.204doz of ping-pong balls.

When table tennis became a competitive sport, celluloid replaced the original primary ping pong ball material of cork as the industry standard.

Throughout the 1900s, these 38mm-diameter balls served as the industry standard for table tennis. We didn't notice a significant difference in the production of ping pong balls until the year 2000.

As we know,

1 doz of ping pong balls = 2.94×10^3 g

thus, 2.94×10^3g of ping pong balls = 1 doz

1 g of ping pong balls = 1/2.94×10^3 doz

600 g of ping-pong balls = 600/2.94×10^3 doz

= 0.204 doz

Hence, 600grams of ping-pong balls is equal to 0.204doz of ping-pong balls.

Learn more about ping-pong ball here :

brainly.com/question/797426

#SPJ13

Answer:

a.6th period

b.groupIIA

The  given statement " about \(Co_{2}\),  Its accumulation in the blood is associated with a decrease in pH" is false  because Carbon dioxide (CO2) is a normal byproduct of metabolism. Its concentration in the blood is actually increased when \(Co_{2}\) accumulates. This accumulation of CO2 causes an increase in the acidity of the blood, which leads to an increase in the pH of the blood.

The \(Co_{2}\)  is then released as a gas, which causes the pH of the blood to decrease back to its normal range. Hyperventilation can lower the concentration of  in the blood by blowing off the \(Co_{2}\) that has been released as a gas. This increases the pH of the blood and can be dangerous if done excessively. More \(Co_{2}\) dissolves in the blood plasma than is carried in the red blood cells (RBCs).

\(Co_{2}\) is dissolved in the blood plasma and is then transported by the RBCs to the lungs where it is exhaled.\(Co_{2}\) concentrations are greater in venous blood than arterial blood because the venous blood has traveled from the tissues where the \(Co_{2}\) has been released from the cells, whereas the arterial blood has not yet traveled through the tissues. The arterial blood has higher oxygen concentrations, but lower \(Co_{2}\) concentrations.

Know more about Carbon dioxide here:

https://brainly.com/question/30355437

#SPJ11

Answer:

Sunspots are cooler and darker than the rest of the Sun's surface. They are marked by intense magnetic activity. Solar prominences are the plasma loops that connect two sunspots. Solar flares and coronal mass ejections are eruptions of highly energetic particles from the Sun's surface.

Explanation:

Answer:

Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth.

Explanation: