A 22.8 L tank of Ar gas is connected to an evacuated 9.26 L tank. If the final pressure is
40.8 mmHg, what must have been the original gas pressure in the tank?

Answer:

In my opinion, 3d is the correct answer.

Answer:

4f

Explanation:

it looks like 4f

Thermal energy is heat it heats you up it give people heat it give away the heat it has until it is cold

Either you miswrote that or something else

Answer:

the type is single replacement

The given reaction equation represents a single-replacement reaction.

Explanation:

                   ABC→ A+B+C

                   A+B+C → ABC

                   AB+ C → AC + B

                  AB+ CD → AC + BD

Given:

\(Fe + CuCl_2 \rightarrow FeCl_2 + Cu\)

To find:

The type of chemical reaction represented by the given equation.

Solution:

In the given reaction:

\(Fe + CuCl_2 \rightarrow FeCl_2 + Cu\)

Iron is replacing copper from its compound which is copper(II) chloride to give iron(II) chloride and copper as a product.

So from this, we can conclude that the given reaction equation represents a single-replacement reaction.

Learn more about types of chemical reactions here:

brainly.com/question/1071297?referrer=searchResults

brainly.com/question/12844777?referrer=searchResults

When hydrogen bromide (HBr) is added to 2-methylbut-2-ene ((CH3)2CCHCH3), an electrophilic addition reaction takes place, where the π bond of the alkene is broken, and the hydrogen and bromine atoms are added to the resulting carbocation.

The reaction proceeds through a Markovnikov addition, where the hydrogen atom attaches to the carbon atom with the greater number of hydrogen atoms.

In this case, the initial addition of HBr to 2-methylbut-2-ene leads to the formation of a primary carbocation, as the positively charged carbon atom only has one alkyl group attached to it. The primary carbocation is relatively unstable, and it can undergo a rearrangement to form a more stable secondary carbocation.

The major product that is typically obtained is the 2-bromo-2-methylbutane. The hydrogen atom from HBr adds to the carbon with three hydrogen atoms (the more substituted carbon), resulting in the formation of a secondary carbocation.

On the other hand, a minor product is also formed, which is 3-bromo-2-methylbutane. This product arises from the addition of HBr to the primary carbocation, which is less stable. Although the primary carbocation is less favored, it can still be formed and lead to the formation of the minor product.

In summary, the addition of HBr to 2-methylbut-2-ene yields two products: the major product is 2-bromo-2-methylbutane, resulting from the addition of HBr to the more stable secondary carbocation, and the minor product is 3-bromo-2-methylbutane, originating from the less stable primary carbocation.

For more such questions on  electrophilic addition visit:

https://brainly.com/question/9643304

#SPJ8

A fruit fly with long wings can have either LL genotype or Ll genotype.

Explanation:

The allele for long wings (L) is dominant, meaning that it will express itself over the recessive allele for short wings (l). A fruit fly can inherit one of each allele from each parent, resulting in three possible genotypes: LL (homozygous dominant), Ll (heterozygous), or ll (homozygous recessive).

If a fruit fly has long wings, then it must have at least one L allele. It could have inherited one L allele from one parent and another L allele from the other parent (LL genotype), or it could have inherited one L allele from one parent and a l allele from the other parent (Ll genotype). Therefore, the likely genotype of a fruit fly with long wings is either LL or Ll.

Answer:

The concentration of the nitric acid (HNO3) solution is 72 M.

Explanation:

To determine the concentration of the nitric acid solution, we can use the concept of stoichiometry and the equation of the neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH):

HNO3 + NaOH → NaNO3 + H2O

The balanced equation shows that the molar ratio between HNO3 and NaOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of NaOH.

Given:

Volume of HNO3 solution = 10.0 ml

Volume of NaOH solution = 3.6 ml

Molarity of NaOH solution = 0.2 M

To find the concentration of the HNO3 solution, we need to calculate the number of moles of NaOH used in the neutralization reaction:

moles of NaOH = volume of NaOH solution * molarity of NaOH solution

= 3.6 ml * 0.2 M

= 0.72 mmol (millimoles)

Since the molar ratio between HNO3 and NaOH is 1:1, the number of moles of HNO3 in the solution is also 0.72 mmol.

Now, we can calculate the concentration of the HNO3 solution using the formula:

concentration (in M) = moles of solute / volume of solution (in L)

concentration = 0.72 mmol / 0.010 L

= 72 mmol/L

= 72 M

Therefore, the concentration of the nitric acid (HNO3) solution is 72 M.

An electron has a negative charge.

The charge of an electron is a fundamental property of the particle, and it is denoted by the symbol "e." The magnitude of the charge of an electron is approximately 1.602 × 10^-19 coulombs (C). This value is considered the elementary charge and is used as a reference for other charges. The charge of an electron plays a significant role in determining the behavior and interactions of atoms and molecules. It is opposite in sign to the charge of a proton, which is positive. The electron's charge allows it to interact with other charged particles, such as protons and ions, through electrostatic forces. Electrons are subatomic particles that orbit the nucleus of an atom in specific energy levels or orbitals. They contribute to the overall stability and chemical properties of atoms and participate in chemical bonding and reactions. The movement of electrons between atoms is what enables the formation of chemical bonds and the sharing or transfer of electrons to create ions. In summary, the charge of an electron is negative, and it plays a fundamental role in the structure and behavior of atoms and molecules.

for more questions on electron
https://brainly.com/question/26084288
#SPJ8

Answer:

Simply carry out the mixed melting point procedure

1 here grind the two substances mix them

2.take note of the melting point of the mixture this is P

3 also get the original product from a different source okay this is Q

4.so I the melting point of P = Q then they represent a similar compound

5. But if melting point of P is not equal to Q then one of the compounds is P is acting as an impurity so they are not the same

The compound has been similar or not has been determined with the determination of the shift in the melting point of the mixture of the two compounds.

The melting point can be defined as the temperature of the substance when it has been converted from the solid state to the liquid state.

The two substances were found to have the same melting point. The compounds have been determined whether they are similar or not by the determination of the melting point of the combined mixtures.

The compounds A and B have been mixed together, and the melting point has been determined. The similar compounds in mixing will give the same melting point. While if the compounds are different, there has been a shift in the melting point of the mixture.

Thus, the compound has been similar or not has been determined with the determination of the shift in the melting point of the mixture of the two compounds.

For more information about the melting point, refer to the link:

https://brainly.com/question/25512265

Answer:

\(T_{sol}=-15.9\°C\)

Explanation:

Hello,

In this case, we can analyze the colligative property of solutions - freezing point depression - for the formed solution when ethylene glycol mixes with water. Thus, since water freezes at 0 °C, we can compute the freezing point of the solution as shown below:

\(T_{sol}=T_{water}-i*m*Kf\)

Whereas the van't Hoff factor for this solute is 1 as it is nonionizing and the molality is:

\(m=\frac{mol_{solute}}{kg\ of\ water}=\frac{45.0g*\frac{1mol}{62g} }{85.0g*\frac{1kg}{1000g} } =8.54m\)

Thus, we obtain:

\(T_{sol}=0\°C+(-8.54m*1.86\frac{\°C}{m} )\\\\T_{sol}=-15.9\°C\)

Best regards.

The freezing point of a solution prepared from 45.0 g ethylene glycol and 85.0 g of water is -15.9 °C.

Freezing point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.

We will use the definition of molality.

b = mass of solute / molar mass of solute × kg of solvent

b = 45.0 g / 62.07 g/mol × 0.0850 kg = 8.53 m

We will use the following expression, where Kf is the cryoscopic constant of water.

ΔT = Kf × b = 1.86 °C/m × 8.53 m = 15.9 °C

The freezing point of pure water is 0°C.

T = 0°C - 15.9 °C = -15.9 °C

The freezing point of a solution prepared from 45.0 g ethylene glycol and 85.0 g of water is -15.9 °C.

Learn more about freezing point depression here: https://brainly.com/question/14115775

Answer:

The correct relationship is D. The greater the atomic number, the lower the half-life.

The passage states that the transuranium elements, elements with atomic numbers greater than 92, have short half-lives and become less stable as the atomic number and mass increase. It also gives specific examples of the half-lives of neptunium (element 93) and kurchatovium (element 104) to support this claim. Thus, as the atomic number increases, the half-life of the element decreases.

Answer: 43 points my bad Cuh I have to get the points

Explanation: :)

Answer:

The energy in cabbage leaves comes from the light from the sun.

Explanation:

The plant keeps the light (in the leaves) as energy to help make it grow.

The technique that would not be helpful in the separation of a mixture of sand and salt is O Magnet.

The combination of salt and sand may be separated via way of means of filtration observed via way of means of an evaporation process. Filtration can separate sand from a aggregate of sand and salt solution (salt dissolved in water). Sand remains at the clear out out paper as a residue after filtering. By boiling the filtrate, not unusualplace salt might also additionally now be produced. Probably the perfect approach to split the 2 materials is to dissolve salt in water, pour the liquid far from the sand, after which evaporate the water to get better the salt.

Thus, the correct option is magnet.

To learn more about filtration check the link below:

https://brainly.com/question/23945157

#SPJ4

Answer:

Baking powder is combination of baking soda and an edible acid such as tartaric acid. When its added to water it reacts to form carbon dioxide. This carbon dioxide produces wet dough and makes cake soft and spongy

Identifying a problem, researching the problem, coming up with potential solutions, choosing the best answer, creating a model, testing the model, and making any necessary adjustments and retests.

The two basic types of issue solving are reflective and inventive. Whatever method of problem solving a class employs, problem solving always centres on understanding the problems, taking all relevant factors into account, and coming up with a solution.

Companies value problem-solving abilities because they demonstrate a variety of other qualities, including logical thinking, creativity, resilience, inventiveness, lateral thinking, and determination. It is a crucial skill for both your personal and professional life.

To know more about potential solutions visit:-

https://brainly.com/question/28901923

#SPJ1

Answer: C. identify a problem

Explanation: on eng

The diluted solution has a concentration of 1.29 M.

Dilution is the process of lowering a solute's concentration in a solution, typically by blending it with more solvent. Diluting a solution entails increasing the amount of solvent without increasing the amount of solute. This solution's salt concentration decreases when 1 liter of water is added.

The concentration of the solute in the solution is diluted when a solvent is introduced. Concentration increases the solute concentration in the solution by eliminating the solvent.

V1M1 = V2M2 is a pretty straightforward formula to utilize for this, where...

Initial volume: 28.8 ml (V1).

Initial molarity (M1) is 9.75.M

V2 = 125 ml final volume

Final molarity, M2, is equal to 1.29 (26.8 ml) (7.23 M) = (150 ml) (x M), where x = 1.29 M.

To know more about diluted solution visit:-

https://brainly.com/question/29439018

#SPJ1

Answer:

d. 0.25.

Explanation:

Hello,

In this case, since the equilibrium repression for the considered chemical reaction is:

\(Ksp=[Ag^+]^2[CrO_4^{2-}]\)

For a concentration of silver of 6.0x10⁻⁶ we need a concentration of chromate anion that makes the reaction quotient greater than the solubility product, thus, we write:

\([CrO_4^{2-}]=\frac{Ksp}{[Ag^+]^2} =\frac{9.0x10^{-12}}{(6.0x10^{-6})^2}\)

\([CrO_4^{2-}]=0.25M\)

It means that at concentrations of chromate anion of 0.25 M or more, the reaction quotient Q becomes greater than the solubility product which means that precipitation will begin occurring, therefore, answer is d. 0.25.

Best regards.

Answer:

1: Na

Explanation:

Out of the four elements, the most reactive element is sodium (Na).

Sodium is a highly reactive metal because it has only one valence electron in its outermost shell, which is relatively far from the positively charged nucleus. This makes it easy for sodium to lose its outermost electron and form a positively charged ion, which is why it readily reacts with other elements.

Aluminum (Al), rubidium (Rb), and indium (In) are also reactive metals, but they are less reactive than sodium.

The flow rate of the IV solution in drops per minute is 80 drops/min.

To determine the flow rate in drops per minute, we need to consider the conversion factors and relationships between different units.

First, let's convert the lidocaine dose from grams to milligrams, as the flow rate is given in milligrams per minute:

1 gram = 1000 milligrams

So, 1.0 gram of lidocaine is equal to 1000 milligrams.

Next, we can calculate the total volume of the IV solution in milliliters:

250 mL

To find the flow rate in milligrams per minute, we divide the dose by the total time:

Flow rate = Dose / Time

The dose is 1000 milligrams (1.0 gram) and the time is 1 minute.

Flow rate = 1000 mg / 1 min = 1000 mg/min

Now, to determine the flow rate in drops per minute, we need to convert the IV solution volume from milliliters to drops. Given that 20 drops = 1.0 mL, we can set up a conversion factor:

20 drops / 1 mL

To find the flow rate in drops per minute, we multiply the flow rate in milligrams per minute by the conversion factor:

Flow rate (drops/min) = Flow rate (mg/min) * Conversion factor

Flow rate (drops/min) = 1000 mg/min * (20 drops / 1 mL)

Now we need to convert milliliters to drops:

Flow rate (drops/min) = 1000 mg/min * (20 drops / 250 mL)

Simplifying the expression:

Flow rate (drops/min) = 1000 mg/min * (4/50)

Flow rate (drops/min) = 80 drops/min

For more such question on flow rate visit;

https://brainly.com/question/1154328

#SPJ8

Answer: Neils Bohr

Explanation: Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

The average atomic mass of titanium on the given planet is approximately 46.68164 atomic mass units (u). The average atomic mass may vary depending on the specific isotopic composition of titanium found on different celestial bodies or regions.

To calculate the average atomic mass of titanium on the given planet, we need to consider the natural abundances and masses of each isotope of titanium.

The average atomic mass is calculated by multiplying the natural abundance of each isotope by its respective mass and summing them up.

Let's perform the calculation step by step:

Step 1: Multiply the abundance of each isotope by its mass:

(73.700% * 45.95263 u) + (15.000% * 47.94795 u) + (11.300% * 49.94479 u)

Step 2: Calculate the individual contributions from each isotope:

= (0.737 * 45.95263) + (0.150 * 47.94795) + (0.113 * 49.94479)

Step 3: Add up the individual contributions:

= 33.84765431 + 7.1921925 + 5.64179347

Step 4: Sum up the contributions:

= 46.68164 u

Therefore, the average atomic mass of titanium on the given planet is approximately 46.68164 atomic mass units (u).

It's important to note that the calculation assumes the provided natural abundances are accurate and representative of the titanium isotopes on that planet.

for more questions on atomic mass

https://brainly.com/question/30390726

#SPJ8

By using the ideal gas law and Avogadro's number, we find that there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.

To determine the number of molecules of CO2 in 2.5 L at STP (Standard Temperature and Pressure), we can use the ideal gas law and Avogadro's number.

Avogadro's number (N_A) is a fundamental constant representing the number of particles (atoms, molecules, ions) in one mole of substance. Its value is approximately 6.022 × 10^23 particles/mol.

STP conditions are defined as a temperature of 273.15 K (0 °C) and a pressure of 1 atmosphere (1 atm).

First, we need to convert the volume from liters to moles of CO2. To do this, we use the ideal gas law equation:

PV = nRT,

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Since we have STP conditions, we can substitute the values:

(1 atm) × (2.5 L) = n × (0.0821 L·atm/(mol·K)) × (273.15 K).

Simplifying the equation:

2.5 = n × 22.4149.

Solving for n (the number of moles):

n = 2.5 / 22.4149 ≈ 0.1116 moles.

Next, we can calculate the number of molecules using Avogadro's number:

Number of molecules = n × N_A.

Number of molecules = 0.1116 moles × (6.022 × 10^23 particles/mol).

Number of molecules ≈ 6.72 × 10^22 molecules.

Therefore, there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.

For more such questions on ideal gas law visit:

https://brainly.com/question/27870704

#SPJ8

4) Ne

Chemistry

Atomic Structure

The most stable (unreactive) elements are found in group 18. They are known as the Noble Gases.

Noble Gases are inert, meaning they do not react easily with other elements. The reason is because their valence electron shells are filled.

Therefore, our best answer is 4) Ne.

Answer:

\(\boxed {\boxed {\sf 4. \ Ne }}\)

Explanation:

On the Periodic Table, the last group of elements are the Noble Gases. These are the most unreactive or stable elements.

According to the Octet Rule, atoms always want to have 8 valence electrons. The Noble Gases already satisfy this rule and have full outer shells, therefore they don't react with other elements often.

The Noble Gases are helium (He) , neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

The only answer choice that is a Noble Gas is 4. Ne

Answer:

A.) 1

Explanation:

Propane only exists in one conformation. It does not have enough carbons to form branches, and there are only hydrogens attached to each carbon. Furthermore, there is no way to twist the carbon or change its orientation (ex. cis- and trans-) to result in a different structure of propane. There is no other way to represent the molecule without drawing a different molecule.

When 216.59 g of HgO completely reacts, 16.00 g of O2 will be produced.

The oxygen produced

The balanced chemical equation for the reaction:

2HgO(s) → 2Hg(l) + O2(g)

states that 2 moles of HgO will produce 1 mole of O2.

We can use the molar mass of HgO and the mole ratio of HgO to O2 to calculate the mass of O2 produced from a given mass of HgO.

The molar mass of HgO is 216.59 g/mol (200.59 g/mol for Hg + 16.00 g/mol for O).

So, 1 mole of HgO has a mass of 216.59 g.

According to the balanced equation, 2 moles of HgO produce 1 mole of O2.

Therefore, 1 mole of O2 has a mass of 32.00 g.

Using stoichiometry, we can calculate the mass of O2 produced when a certain mass of HgO reacts completely.

For example, if we start with 216.59 g of HgO (1 mole), then the amount of O2 produced will be 0.5 moles (1 mole of O2 for every 2 moles of HgO), which is equivalent to 16.00 g of O2 (0.5 moles of O2 x 32.00 g/mol).

So, when 216.59 g of HgO completely reacts, 16.00 g of O2 will be produced.

Learn more on chemical reaction here https://brainly.com/question/11231920

#SPJ1

Answer:

The increase in human population has impacted Earth's resources in several major ways:

• Increased demand for food, water, and shelter. A larger population requires massive increases in food, water, and living spaces which strains natural resources and infrastructure. Producing enough food alone is a significant challenge.

• Accelerated consumption of resources. As population grows, the use of resources like forests, minerals, fossil fuels also increases rapidly to meet demands. This accelerated depletion of resources threatens long term sustainability.

• Increased pollution. A bigger population produces more pollution, waste, emissions, and environmental degradation as a byproduct of energy usage, transportation, industrialization, and land/resource use. This pollution harms ecosystems and contaminates the air, water and land.

• Biodiversity loss. As natural habitats are destroyed or fragmented to enable more human use, many plant and animal species lose their homes and face a higher risk of extinction. Tropical rainforests, in particular, have been heavily impacted.

• Inequality. While resources are limited, population growth often exacerbates inequality in access to and distribution of resources. Poor or developing regions typically have the highest populations but fewest resources per capita.

• Migration and conflict. Shortages of resources in certain areas or regions may lead to migration, economic troubles, social unrest, and in some cases even resource conflicts or wars.

• Slower development. Extremely rapid population growth rates make it difficult for governments, organizations and societies to effectively manage development, improve standards of living, advance technology, and make other progress at an optimal pace. Slower, more stabilized population growth may enable a higher overall quality of life.

So in many profound and troubling ways, increased population size has created immense pressures on Earth's resources and made it more difficult to meet present and future needs in a sustainable manner. Most experts agree that slowing population growth is critical to ensuring resource security for future generations.

Explanation:

Answer:

To calculate the heat released in this reaction, we need to use the formula:

Q = mcΔT

where Q is the heat released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the change in temperature.

Assuming the density of the solution is 1 g/mL, the mass of the solution is 100 g (50 mL HCl + 50 mL NaOH). The specific heat capacity of the solution can be assumed to be the same as that of water, which is 4.18 J/g°C.

The change in temperature can be calculated as the final temperature minus the initial temperature:

ΔT = 30°C - 22°C = 8°C

Therefore, we have:

Q = (100 g) * (4.18 J/g°C) * (8°C) = 3344 J

The heat released in the reaction is 3344 J.

The value of ΔH for the reaction can be calculated using the formula:

ΔH = -Q/n

where Q is the heat released, and n is the number of moles of limiting reactant used in the reaction. In this case, the limiting reactant is NaOH, and we can calculate the number of moles of NaOH from its concentration and volume:

n(NaOH) = (0.1 L) * (1 mol/L) = 0.1 mol

Therefore, we have:

ΔH = -(3344 J) / (0.1 mol) = -33,440 J/mol

The value of ΔH for the reaction is -33,440 J/mol, which is negative because the reaction is exothermic (heat is released).