a deep-sea diving mixture contains 4.0% oxygen and 96.0% helium. what is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.5 atm?

Answer:

We know that 18 g of H2O contains 1 mole (or 6.022 x 10^23) molecules of water because the molar mass of H2O is 18 g/mol.

So 1 g water will contain 1/18 moles of H2O molecules.

Now 15 g of water will contain 15/18 moles of H2O.

So molecules of H2O = (15/18) x 6.022 x 10^23 = 5 x 10^23 molecules.

Explanation:

I learned this in science hope this helps.

Answer:

d. why matter exists

Explanation:

The kind of questions that chemistry CANNOT answer is "why matter exists".

In Chemistry, question of how the properties, composition and structure of substances are is answered. Also, the transformations that these substances undergo, and the energy that they release or absorbe during the transformation processes are revealed in chemistry.

Chemistry can answer the question of what forms of matter exists but cannot answer why matter actually exists.

We can use the formula:

M1V1 = M2V2

where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.

In this case, we know:

M1 = 12.0 M

V1 = ?

M2 = 0.100 M

V2 = 500.0 mL = 0.500 L (since 1 mL = 0.001 L)

We can rearrange the formula to solve for V1:

V1 = (M2V2) / M1

Substituting the values we know, we get:

V1 = (0.100 M)(0.500 L) / 12.0 M

V1 = 0.00417 L = 4.17 mL

Therefore, we need to measure 4.17 mL of 12.0 M hydrochloric aqueous solution and add it to 500.0 mL of water to prepare 500.0 mL of a 0.100 M diluted solution.

Answer:

mass no = A

Atomic number = Z= no of protons

Neutron = n

n = A-Z

n= 35- 17

   = 18

Explanation:

Answer:

like if someone finna do that for 5 points

For the following equilibrium Q (1.85×\(10^-^1^9\)) is less than \(K_s_p\) (7.5×\(10^-^1^1\)), Hence ,  no precipitate will form

To determine if a precipitate will form, we need to compare the reaction quotient (Q) to the solubility product constant (Ksp).

Step 1: Write the expression for the reaction quotient (Q) for the given equilibrium:
Q =\([Pb^2^+][I^-]^2\)

Step 2: Plug in the given lead concentration:
Q = 3.6 × \(10^-^7)[I^-]^2\)

Step 3: Since there are two iodide ions for each lead ion in the balanced equation, we can assume that [I-] = 2 × [Pb2+]. Therefore:
Q = (3.6×\(10^-^7\)) 2 × 3.6×\(10^-^7)^2\)

Step 4: Calculate Q:
Q ≈ 1.85×\(10^1^9\)

Step 5: Compare Q to \(K_s_p\) :
If Q < \(K_s_p\) , no precipitate will form.
If Q > \(K_s_p\) , a precipitate will form.

In this case, Q (1.85×\(10^-^1^9\)) is less than \(K_s_p\)  (7.5×\(10^-^1^1\)), so no precipitate will form.

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Difference between molecular weight and molar mass

Hint : Molar mass of molecules is also called molecular weight . Its unit is gram per mole. We can calculate molar mass of molecule with the help of following rules; ... Molar mass of nitric acid (HNO3) =atomic mass of hydrogen + atomic mass of nitrogen +3× atomic mass of oxygen .

Answer:

answer

Explanation:

Sorry I do not know the answer, hope you have a great day

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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The cations found in higher concentration in the intracellular fluid (ICF) are potassium ions (K+) and magnesium ions (Mg2+).

The cations that are found in higher concentration in the intracellular fluid (ICF) are potassium (K+) and magnesium (Mg2+). This is because these cations are actively transported into the cell to maintain the electrochemical balance and are involved in many cellular processes such as protein synthesis, enzyme activity, and energy metabolism.

On the other hand, sodium (Na+) and calcium (Ca2+) are found in higher concentration in the extracellular fluid (ECF) and play important roles in maintaining fluid balance, nerve and muscle function, and blood pressure regulation.

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Explanation:

carbon dioxide is it gas that is present in the air plants collect carbon dioxide through tiny holes called Stomates. during the process of photosynthesis, Stomates are also used to expel a gas called oxygen. Oxygen is very important for animals like human -- we need it to breathe !

The Earth's surface is not covered with the same materials ; however, some areas share similar materials.Several drilling sites have been dug in various regions of the planet to analyze the Earth's surface.

Each drilling site is unique, with differing characteristics and results. Despite these differences, all of the drilling sites analyzed offer scientists a more in-depth knowledge of the Earth's surface.In essence, the scientific drilling sites each had different lithologies, stratigraphies, and geologies. Each site had different types of rocks, depths, and ages, which led to varying drilling conditions, depths, and equipment used. Different types of equipment were also used to reach the depths required, which was a significant difference in each drilling site.The scientific drilling sites also had different purposes. Scientists had specific goals they wanted to achieve at each location. For example, the scientific drilling site in the Iceland region was focused on analyzing a unique layer of igneous rocks. The primary objective was to investigate the formation of the rock layer.The same materials were not found at each scientific drilling site.

Still, they had some similarities. They all provided geologists with vital information about the Earth's surface. The data provided from each drilling site was used to piece together the Earth's geologic history and how it has changed over time.

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Answer:

Explanation:

When the 500.0 mL of 0.20 M phosphoric acid is added to 1.00 L of water, the total volume of the resulting solution becomes:

500.0 mL + 1000.0 mL = 1500.0 mL = 1.5 L

The number of moles of phosphoric acid in the solution is:

moles of H3PO4 = Molarity × volume in liters

moles of H3PO4 = 0.20 M × 0.500 L = 0.100 mol

The molarity of the resulting solution is then:

Molarity = moles of solute ÷ volume of solution in liters

Molarity = 0.100 mol ÷ 1.5 L = 0.067 M

Therefore, the molarity of the resulting solution is 0.067 M.

Answer:

58.09 g/mol

Explanation:

To find the molar mass, add together the atomic masses of all the elements in the compound.

C - 3 × 12.01 = 36.03

H - 6 × 1.01 = 6.06

O - 16.00

36.03 + 6.06 + 16.00 = 58.09 g/mol

The molar mass of acetone is 58.09 g/mol.

Hope that helps.

Answer:

No, it is not.

Explanation:

Oil is a non-renewable source of energy. ... Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.

*You Can put this in your own words

Answer:

B

Explanation:

The neucles is surrounded by electrons. Electrons occupy most of the volume of the atom.

Atomic Model:

Atoms are the smallest unit of elements, which form bonds with others. In an atom, electrons revolve around the nucleus.

The nucleus is composed of positively charged protons and neutrons. The nucleus occupies a very small part of the atom.

Electrons are negatively charged particles, they are found around the nucleus and occupy most of the part of the atom.

Therefore, The neucles is surrounded by electrons. Electrons occupy most of the volume of the atom.

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Recrystallization is a common technique used in chemistry to purify solid compounds. The basic logic behind recrystallization is to dissolve a solid impure compound in a suitable solvent.

The basic logic behind recrystallization is to dissolve an impure solid in a suitable solvent at an elevated temperature and then allow it to slowly cool down. During the cooling process, the compound will crystallize out of the solution, ideally in the form of pure crystals, while leaving behind impurities in the solution or on the container.
At the molecular level, recrystallization takes advantage of the differences in solubility between the compound of interest and the impurities. When the solid is dissolved in a hot solvent, the molecules gain enough thermal energy to overcome the intermolecular forces holding the crystal lattice together. As a result, the compound dissociates into individual molecules or ions that are dispersed throughout the solvent.
During cooling, the solubility of the compound decreases, causing the molecules to come closer together and reassemble into a solid crystal lattice. However, the impurities, which may have different molecular structures or sizes, do not fit as well into the crystal lattice and are less likely to be incorporated into the growing crystals. Instead, they remain in the solvent or are trapped at grain boundaries.
By carefully controlling the cooling rate and solvent selection, the impurities can be excluded from the growing crystals, leading to the formation of larger and more pure crystals. The crystals can then be separated from the solution through filtration or other techniques, resulting in a purified solid compound.

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Electrovalent combinations are a sort of chemical connection created when one or more electrons are transferred from one atom to another, resulting in the production of ions with opposing charges.

MgCl2, CaCl2, MgO, Na2S, CaH2, AlF3, NaH, KH, K2O, KI, RbCl, NaBr, CaH2, etc. are some examples.

The electrovalent combinations display the crucial traits listed below.

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Answer:

response variable is one

Reflecting telescopes are preferred for scientific research because they are better suited for gathering large amounts of light and producing high-quality images. However, refracting telescopes are still popular for amateur astronomers and for viewing objects on Earth.

Reflecting telescopes are different from refracting telescopes because reflecting telescopes use mirrors, whereas refracting telescopes use lenses. The reflecting telescope was invented in 1668 by Sir Isaac Newton, and it has since become one of the most popular types of telescopes.
Reflecting telescopes use a mirror to gather and focus light, while refracting telescopes use a lens to do the same thing. Reflecting telescopes can be made much larger than refracting telescopes because it is easier to make large mirrors than it is to make large lenses. The mirror in a reflecting telescope is placed at the back of the telescope, and it gathers and reflects light back to a secondary mirror, which then reflects the light to the eyepiece. The eyepiece is where the observer looks through the telescope.In contrast, the lens in a refracting telescope is placed at the front of the telescope, and it gathers and bends light as it passes through. The lens focuses the light onto an eyepiece at the back of the telescope. Refracting telescopes are generally smaller than reflecting telescopes because of the difficulty of making large lenses.
Another difference between reflecting and refracting telescopes is the way they are constructed. Reflecting telescopes have a simple tube that houses the mirrors and eyepiece, while refracting telescopes have a more complex design with a long tube that contains the lens and eyepiece.

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The mole fraction of sulfur hexafluoride gas X(SF₆) = 0.361 and the mole fraction of dinitrogen difluoride gas X(N₂O) = 0.639

moles of each gas

n = m / M

where,

n: moles and m: mass, M: molar mass

SF₆: 16.7 g / 146.06 g/mol = 0.114 mol

N₂O: 8.88 g / 44.01 g/mol = 0.202 mol

The total number of moles is 0.114 mol + 0.202 mol = 0.316 mol

To calculate the mole fraction of each gas

X = moles of gas / total number of moles

X(SF₆) = 0.114 mol / 0.316 mol = 0.361

X(N₂O) = 0.202 mol / 0.316 mol = 0.639

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Answer:

where is the question?

Explanation:

Given parameters:

   Isotope ;

           Si - 28

           ²⁸₁₄Si;

The specie undergoes an alpha decay; An alpha particle resembles a helium atom;

           ²⁸₁₄Si   →  ⁴₂He  +   ?

In nuclear reactions, the mass and atomic numbers are usually conserved;

   So let specie unknown be denote as X

          ᵃₙX;

           ²⁸₁₄Si   →  ⁴₂He  +   ᵃₙX

Sum of the mass number on the reactant side must equal to that on the product side;

         28  = 4 + a

         28 - 4  = a

               a  = 24  mass number of X;

   14  = 2 + n

   n = 14 - 2  = 12   atomic number of X;

 Now, the species X with an atomic number of 12 is magnesium

  Symbol is Mg

   Mass number   = 24

Answer:  1 mol of Zn is 65.38g

Explanation: To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn. Hence, 1.34 g of Zn contains 0.020 moles of Zinc.

0.34 mole of atoms in 22.5 g Zn.

A mole is defined as 6.02214076 × \(10^{23}\) of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn.

\(Moles = \frac{mass}{molar \;mass}\)

\(Moles = \frac{22.5}{65.38 u}\)

Moles = 0.34 mole

Hence, 0.34 mole of atoms in 22.5 g Zn.

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Water has the chemical formula H20 and is composed of atoms bound together to form molecules.

The correct answer is A,D

A molecule is the tiniest unit of any substance that is capable of independent existence and that is made up of one or more components while still maintaining the substance's physical and chemical properties. Even more atoms can be separated from molecules. The symbols for the oxygen atom and molecule, respectively, are O and O2, respectively.

The term "life's four fundamental sorts of molecules" is frequently used. Proteins, carbohydrates, lipids, and nucleic acids make up the four molecules that make up life. For every living thing on Earth, each of the 4 groups is essential. A cell and an organism cannot exist without any one of these four molecules.

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Answer:

Hydrogen: 5

Carbon:3

Nitrogen:3

Oxygen: 9

please give me brainliest

Answer:

sunlight is the answer i think

Answer:

Virus is living due to reproduction and non-living due to crystal appearance.

Explanation:

Characteristics that viruses display is the ability of reproduction in which they increase in population which is a living character and have DNA or RNA which help them to make exact copies of itself. Virus is parasitic in nature because it causes harm to the living host such as humans, animals and plants. Some characteristics that viruses don't display are that they are not like living cells, have no membrane around them, no organelles such as mitochondria, golgi bodies, endoplasmic reticulum and lysosomes etc. Viruses are present in crystal form outside the cell.

The molecule that is not polar is BCl₃ because BCl₃ has a symmetrical trigonal planar shape with three identical B-Cl bonds, resulting in a symmetrical distribution of charge around the molecule and no net dipole moment.

Polarity in a molecule is determined by the electronegativity difference between the atoms in the bond and the molecule's overall geometry. In the case of BCl₃, the electronegativity difference between boron and chlorine is relatively small, and the molecule's trigonal planar geometry results in a symmetrical distribution of charge, canceling out any dipole moment.

In contrast, CHCl₃, NH₃, and HCN all have polar covalent bonds due to differences in electronegativity between the atoms involved, resulting in a net dipole moment in the molecule. Overall, the polarity of a molecule plays a significant role in its chemical properties, such as its solubility and reactivity.

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