A sample of gas has temperature of 372 K and pressure of 3.8 ATM. If the temperature is increased to 550 K, what is the new pressure?

The pH of the solution is 5.07.

We know that when we mix the sodium acetate with a solution of acetic acid what we are going to have is a buffer. We know that the buffer is the kind of solution that we are able to get from a weak acid and its salt just as acetic acid and sodium acetate.

We know that;

Molarity of the salt = 0.43/0.5 L = 0.86 M

Molarity of the acid = 0.21/0.5 L = 0.42 M

Hence;

pH = pKa + log(salt/acid)

pH = 4.76 + log(0.86/0.42)

pH = 5.07

We would have a pH of 5.07

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Elements that are chemically similar to calcium (Ca) can interfere with bodily functions are Beryllium and magnesium.

The chemical element calcium has the atomic number 20 and the letter Ca as its symbol. Calcium is an alkaline earth metal that reacts with air to create a black oxide-nitride coating. Its heavier homologues barium and strontium are most similar to it in terms of physical and chemical characteristics.

Calcium reacts when heated with boron, carbon, sulfur, phosphorus, halogens, and hydrogen. Calcium is more expensive and less reactive than sodium, despite being a better reducing agent than the latter.

Thus, Elements that are chemically similar to calcium (Ca) can interfere with bodily functions are Beryllium and magnesium.

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1.) Chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution. 2.)  You will need to use 0.12 L of 1.50 M solution to make 2.40 L of 0.0750 M solution. 3.) Solution has a molality of 0.00229 mol/kg.

Molality is defined as a measure of number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.

1.) As, mass = moles x molar mass

Molar mass of KMnO4 is 158.03 g/mol

So, mass = 0.50 mol x 158.03 g/mol = 79.02 g

Therefore, the chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution.

2.)As , C1V1 = C2V2

Here C1 is initial concentration, V1 is initial volume, C2 is final concentration and V2 is the final volume.

1.50 M x V1 = 0.0750 M x 2.40 L

Now, V1 = (0.0750 M x 2.40 L) / 1.50 M

So, V1 = 0.12 L

You will need to use 0.12 L of the 1.50 M solution to make 2.40 L of the 0.0750 M solution.

3.) Formula for molality is: m = (moles of solute) / (kg of solvent)

As, moles = (mass of solute) / (molar mass of solute)

= (20 g) / (58.44 g/mol) = 0.344 mol

m = (0.344 mol) / (150 g / 1000 g/kg) = 0.00229 mol/kg

So, the solution has a molality of 0.00229 mol/kg.

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Answer:

Option C

Explanation:

The answer is option C or "The amount of time it takes to rotate around it's axis is the same amount of time it takes to revolve around Earth."Remember that the Earth and the Moons amount of time to make a full rotation is almost in sync and they're two sides of the moon, one side we do not see and that's because that side is currently faced away from the Earth which is called the dark side of the moon. Each side has two weeks oh night, and two weeks of day because of how long it takes the moon to revolve, so while we have a side towards the Earth which is illuminated by the sun we have another pointing away in the dark.

Hope this helps.

No it’s not balanced. The Na are not balanced (option A)

the given chemical equation is not balanced because It is missing some coefficients to balance the number of atoms on both sides of the equation.

The balanced chemical equation for the reaction is:

Na2SO4 + Mg(OH)2 → MgSO4 + 2NaOH

This equation shows that two molecules of sodium hydroxide (NaOH) are produced for every one molecule of magnesium hydroxide (Mg(OH)2) consumed, and that the number of sodium (Na) atoms is balanced on both sides of the equation.

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Explanation:

1 km = 1000m

55.6 km = x m

x = 55.6*1000

x = 55600m

Answer:

55,600 meters

Explanation:

1km=1,000 meters

55.6km= 55,600 meters

Answer:

2 moles

In words, 1 mole of Mg reacts with 2 moles of HCl to form 1 mole of MgCl₂ and 1 mole of H₂. The molar ratio of HCl to MgCl₂ is 2:1.

Answer: C

Explanation:

Model 3 represents one type of compound.

Pure substances are a specific type of matter (e.g., water, helium).

Answer:it would be in group 14 and in period 8.

Explanation:

Answer:

The H—C—H bond angle in methane is the tetrahedral angle, 109.5°. This angle is obtained when all four pairs of outer electrons repel each other equally. The bond angles in ammonia and in water are less than 109.5° because of the stronger repulsion by their lone pairs of electrons.

Explanation:

hope it helps!

The final temperature of the water, given that the heat produced from the burning is added to 5691 g of water at 21 °C, is 79.2 °C

First, we shall obatine the heat of burning 7.90 g of C₆H₆. Details below:

2C₆H₆ + 15O₂ ⟶ 12CO₂ + 6H₂O +6542 KJ

Molar mass of C₆H₆ = 78 g/mol

Mass of C₆H₆ from the balanced equation = 2 × 78 = 156 g

From the balanced equation above,

156 g of C₆H₆ required 6542 KJ of heat

Therefore,

7.90 g of C₆H₆ will require = (7.90 × 6542) / 156 = 331.294 KJ

Finally, we shall determine the final temperature of the water. Details below:

Q = MC(T₂ - T₁)

331294 = 5691 × (T₂ - 21)

Clear bracket

331294 = 5691T₂ - 119511

Collect like terms

331294 + 119511 = 5691T₂

450805 = 5691T₂

Divide both sides by 5691

T₂ = 450805 / 5691

T₂ = 79.2 °C

Thus, the final temperature is 79.2 °C

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Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.

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Answer:

answer is a

Explanation:

i took quiiiiiiz

Answer:

an inference is an educated answer based on a piece of information you have been given

Explanation:

e.g. they had pigtails in their long blonde hair.

from this we can infer that I am speaking about a girl

Answer:

yee I'm excellent in maths and science

Answer:

L

Explanation:

Choosing a biome for a research project can provide a wealth of opportunities to better understand the natural world and contribute to important conservation and management efforts.

There are several convincing reasons for researchers to choose a particular biome for their project, some of which include:

Biodiversity: Biomes are characterized by their unique plant and animal species, which can provide a diverse range of research opportunities, including studying their adaptations, behaviors, and interactions.

Climate Change: Biomes are also influenced by climate change, making them an important area of research to better understand how these ecosystems are being affected by changes in temperature and precipitation patterns.

Human Impacts: Human activities, such as deforestation, agriculture, and urbanization, can have a significant impact on biomes. Studying these impacts can help researchers better understand how to mitigate and manage these effects.

Biogeochemical Cycles: Biomes are also important for studying biogeochemical cycles, such as the carbon and nitrogen cycles, which are essential for sustaining life on Earth.

Conservation: Finally, studying biomes can also contribute to conservation efforts, helping to preserve these unique ecosystems and the species that inhabit them.

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Answer:

By revive, I assume you're talking about medical assistance.

Explanation:

You can use CPR, where you lay a person back, hold their head up, and push on their chest to the beat "staying alive", in which it keeps their heart beating. If they aren't breathing, you can do mouth to mouth breathing, and continue the process until help arrives or.. the person is no longer with us.

If you have a defibrillator, you can use it on a low amp, or whatever amp you think would be most suitable for the condition of the person.

*yes the person below copy/pasted my thingy. yes its funny.

Answer: i don't  even know what you said but i think you said this,

CPR, where you lay a person back, hold their head up, and push on their chest to the beat "staying alive", in which it keeps their heart beating. If they aren't breathing, you can do mouth to mouth breathing, and continue the process until help arrives or.. the person is no longer with us,

If you have a defibrillator, you can use it on a low amp, or whatever amp you think would be most suitable for the condition of the person.

Hope this helps :)

Explanation:

First, we need to know that sulfur is a element therefore it is not made, it is found in nature. When associated with other chemical elements, forming sulfates, sulfites or sulfides, sulfur can be obtained from oil, natural gas and coal. However, the element sulfur is most commonly found in minerals such as: Pyrite (iron disulfide), Cinnabar (mercury sulfide), Sphalerite (zinc sulfide) and Galena (lead sulfide).

Answer: sulfur can be obtained from oil, natural gas and coal. However, the element sulfur is most commonly found in minerals such as: Pyrite (iron disulfide), Cinnabar (mercury sulfide), Sphalerite (zinc sulfide) and Galena (lead sulfide).

By dividing the specified mass by the molar mass of NaCl N a C l, which is: =58.44 g/mol, we may accomplish this.

Molecules per liter, or mol/L, are used to measure molarity. A 0.30 M NaCl solution has 0.30 mol of sodium chloride per liter of fluid. Making solutions is a common task for chemists, thus performing the calculations required to create a specific volume of solution is instinctive. Sodium chloride has a molar mass of 58.5 grams. 0.085 moles of sodium chloride make up one mole. The solution is thought to have a volume of 100mL, or 0.1L. Hence, the 5% saline molarity. Therefore, we must ascertain the NaCl N a C l's equivalent number of moles in order to obtain the molarity.

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The evidence from the article highlights these practices as effective means of improving water quality. By implementing these measures, both individuals and governmental agencies can contribute to the preservation and protection of water resources.

According to the article, there are several practices that members of the public and governmental agencies can adopt to improve water quality:

Implementing proper wastewater management: This involves treating wastewater before it is released back into the environment. The article emphasizes the importance of implementing advanced treatment technologies to remove pollutants effectively.Promoting sustainable agriculture: The article highlights the significance of adopting practices that minimize the use of fertilizers and pesticides, such as precision agriculture techniques. These practices can reduce the runoff of agricultural chemicals into water bodies.Establishing buffer zones: Creating vegetated buffer zones along rivers, lakes, and streams can help filter and absorb pollutants, preventing them from entering the water bodies. The article suggests that buffer zones should be implemented to reduce sediment, nutrient, and pesticide runoff from adjacent fields.Encouraging responsible industrial practices: The article emphasizes the need for industries to adopt eco-friendly practices, including proper disposal of industrial waste and the use of environmentally friendly production techniques.

Raising awareness and education: Public education campaigns can play a crucial role in improving water quality. The article suggests that educating the public about the impact of their actions on water bodies and providing information on sustainable practices can lead to positive changes.

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Answer:

d. 10

Explanation:

The 24 means the atomic mass and twelve means the number of electrons. You subtract the number of electrons from the atomic mass. 24-12=12

Then, since there's +2, you subtract 2 from 12 which equals 10 which means there are 10 electrons now.

The confusing thing is that + means subtract and - means add here.

Hope this helps.

Answer: Refract

Explanation:

The wavelength of the hydrogen atom moving at 3.50 x 10² cm/s is approximately 0.113 nm.

By splitting a wave's velocity by its frequency, a wavelength can be determined. The solution shown here is a common way to state this.  stands for frequency, measured in metres. The v represents wave motion and is measured in metres per second. (mps).

We can apply the formula for an object's momentum (p) to determine the momentum of the hydrogen atom:

p = mv

where m is the hydrogen atom's mass and v is its speed.

The rate must first be changed from cm/s to m/s:

3.50 x 10² cm/s = 3.50 m/s

Now, we can compute the momentum:

p = (1.674 x 10⁻²⁷ kg) × (3.50 m/s)

p = 5.87 x 10⁻²⁷ kg·m/s

Last but not least, we can determine the de Broglie wavelength:

λ = h / p

λ = (6.626 x 10⁻³⁴ J·s) / (5.87 x 10⁻²⁷ kg·m/s)

λ ≈ 1.126 x 10⁻¹⁰ m

To convert this to nanometers, we can multiply by 10^9:

λ ≈ 1.126 x 10⁻¹ nm

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The gas that has a volume of 752 mL at 1.98 atm and 62°C is most likely NO₂ (option D).

The volume of a sample of gas can be calculated using the following formula:

PV = nRT

Where;

According to this question, the volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62°C. The number of moles is as follows:

1.98 × 0.752 = n × 0.0821 × 335

1.489 = 27.5n

n = 0.054mol

molar mass of the gas = 2.49g ÷ 0.054mol = 45.99g/mol

The gaseous substance with the molar mass of 45.99g/mol is NO₂.

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Answer:

Oxidation number:

3*1+ oxidation number of J+2*-2= -1

Oxidation number of J = 0

Answer:

there's just one atom.

Based on the expression given in the question, X is the effective nuclear charge, and it increases down a group.

Effective nuclear charge is the net nuclear charge that an electron in an atom experiences, after subtracting the nuclear charge shielded by other electrons.

The effective nuclear charge is denoted by Zeff and can be calculated by subtracting the number of shielding electrons from the atomic number.

Therefore, based on the expression given in the question, X is the effective nuclear charge, and it increases down a group.

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Polysaccharides are a type of carbohydrate polymer composed of repeating units of monosaccharides. They are not one of the three main types of macromolecular polymers in the cell.

The reason for false statement are as following :-

a. The statement is false because polymers are assembled from monomers within the cell, not in an extracellular compartment. Cells have the ability to synthesize a variety of polymers, including nucleic acids, proteins, and carbohydrates, to perform specific functions within the cell. The assembly of polymers from monomers is an energy-intensive process that requires enzymes and specific conditions, such as the appropriate temperature and pH level. Therefore, the synthesis of polymers typically occurs within the cell.

A correct description would be: Polymers are assembled from monomers within the cell, and the synthesis of polymers is an energy-intensive process that requires enzymes and specific conditions.

b. The statement is false because polysaccharides are not one of the three main macromolecular polymers in the cell. The three main types of macromolecular polymers in the cell are nucleic acids, proteins, and carbohydrates. Polysaccharides are a type of carbohydrate polymer, but they are not one of the three main types of macromolecular polymers. Polysaccharides are composed of repeating units of monosaccharides, which gives rise to a limited number of polysaccharide sequences.

A correct description would be: Polysaccharides are a type of carbohydrate polymer composed of repeating units of monosaccharides. They are not one of the three main types of macromolecular polymers in the cell.

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