a gaseous mixture of o2 and n2 contains 40.8 % nitrogen by mass. what is the partial pressure of oxygen in the mixture if the total pressure is 345 mmhg ?

These protons, neutrons and electrons are the three fundamental particles of atoms

What is atom ?

The atom is the smallest unit of matter that may be divided without releasing electrically charged particles. It is also the lowest unit of matter that has chemical element features. As a result, the atom is the fundamental building block of chemistry.

Examine various electron configurations in electron shells surrounding an atom's nucleus.

The majority of the atom is empty space. The rest of the structure is made up of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. In comparison to electrons, the lightest charged particles in nature, the nucleus is small and dense.

The mass of an electron is approximately 9.109382911 1028 gramme. A proton or neutron has a mass that is approximately 1,836 times greater. This explains why the mass of an atom is governed mostly by the mass of its protons and neutrons in its nucleus.

Mass of protons, m

p =1.67×10 −27 kg

Mass of electrons, m

e =9.11×10 −31 kg

∴ m e

​mp≈1836

The proton to electron mass ratio is represented by μ or β. It is a dimensionless quantity.

μ= m e

​

mp≈1836

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Molecular formula of a molecule is C₂H₂.

Empirical formula gives the proportion of the elements present in a compound.

The proportion od carbon and hydrogen is 1 : 1.

n(C) : n(Cl) = 1 : 1

n(C) = n(H) = n; amount of substance of carbon and hydrogen is the same in a molecule

M(molecule) = 26 g/mol; molar mass of a molecule

M(C) = 12 g/mol; molar mass of carbon

M(H) = 1 g/mol; molar mass of hydrogen

M(molecule) = n × M(C) + n × M(H)

M(molecule) = n × 12 g/mol + n × 1 g/mol

26 g/mol = n × 13 g/mol

n = n(C) = n(H) = 2

There are 2 atoms of carbon and two atoms of hydrogen in a molecule, so molecular formula is C₂H₂.

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Answer:

i think D

Explanation:

Answer:

Liquid particles are farther apart than solid particles.

Explanation:

Liquid particles are more far apart than solid particles, explaining why it takes the shape of its container and does not have a definite shape, but has a definite volume. Solid particles are more tightly packed together, and certain solids even have particle patterns at the atomic level, which is why it has a definite shape and does not change unless it changes states.

According to forces of attraction in molecules, molecules of liquid are far away as compared to molecules of solid.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Chromatography is a method of separating out materials from a mixture.

Aim:  To separate the dye present in ink by the process of evaporation.

Materials required:  Beaker, watch glass, water, ink and stove.

Procedure: Take a beaker and fill it to half its volume with water.  Keep 3, glass on the mouth of a beaker.  Put few drops of ink on the watch glass. Heat the beaker and observe the watch glass.  

Observations:   We observe some fumes coming from the watch glass.   Continue heating till you do not observe any further change on the watch glass.   A small residue will be remained on the watch glass.  

Inference:   We know that ink is a mixture of a dye in water.   The residue remained on the watch glass is the dye present in the ink.

Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography.

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The removal of the alcohol seen in the conversion of the nasal decongestant pseudoephedrine to the illicit drug methamphetamine constitutes reduction process.

Redox is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state. The removal of the alcohol seen in the conversion of the nasal decongestant pseudoephedrine to the illicit drug methamphetamine constitutes reduction process. The “Birch method” is a chemical reduction reaction to convert pseudoephedrine in base form into methamphetamine. The “Red Phosphorous method” is a chemical reduction reaction utilizing red phosphorus/hydriodic acid chemistry to convert pseudoephedrine to methamphetamine.

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Answer:

0.419 mol O₂

Explanation:

just took test

Large particles usually get smaller as a result of surface reactions. Both heating and freezing effects of tiny particles on the climate are seen.

Weathering can be classified as either physical or chemical. There is a wide variety in soil particle size due to variations in weathering processes.The overall surface area increases when the size is reduced more. This is significant since most chemical changes start at an object's surface.

The Earth's materials are the four major elements that make up the earth's crust. The earth is made up of minerals, rocks, soil, and water. Earth materials include the necessary building components for life, agriculture, and industry.

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The estimation of the acidic and the basic character of a solution is called and defined by the pH. The \(\rm [H^{+}]\) concentration of the solution will be \(\rm 1.77\times 10^{-4}.\)

pH is a measurement of the free hydrogen and hydroxyl ions in the solution of the substance.

It can be calculated as:

\(\rm pH = - \rm log[H^{+}]\)

Given,

pH = 3.75

Substituting values in the equation:

\(\begin{aligned}\rm 3.75 &= -\rm log[H^{+}]\\\\\rm [H^{+}] &= 10^{-3.75}\\\\&= 1.7782 \times 10^{-4}\end{aligned}\)

Therefore,  \(\rm 1.77\times 10^{-4}\) is the concentration of the hydrogen ions.

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Answer:

1.78 x 10^nM

n= -4

Explanation:

the answer after that is A

Answer:

option C two organisms with desired traits are bred

A statement that stores the uppercase equivalent of the string referenced by the city variable is as follows:

uppercity = city.toUpperCase();

```

To store the uppercase equivalent of the string referenced by the variable "city" in the variable "uppercity," you can use the "toUpperCase()" method in Java. In the given code snippet, the "toUpperCase()" method is applied to the "city" variable and the resulting uppercase string is assigned to the "uppercity" variable.

The "toUpperCase()" method is a built-in function in Java that converts all the characters in a string to uppercase. It returns a new string with all uppercase characters, while leaving the original string unchanged. By invoking this method on the "city" variable, we ensure that the resulting uppercase string is assigned to the "uppercity" variable.

Using the "toUpperCase()" method is a convenient and straightforward way to convert a string to its uppercase form. It eliminates the need for manual conversion and provides a more concise and readable code.

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Answer:

75.6

Explanation:

756x0.1=75.6

1 d =hm=0.1

Answer:

You would need to multiply.

Explanation:

Multiply the numbers separately.

SO do 19x15 and see what you get.

13.015  grams of acetylene (C2H2) are required to produce 1.0 moles of CO2.

To find the number of grams of acetylene (C2H2) required to produce 1.0 moles of CO2, we can use the balanced equation for the combustion of acetylene: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

From the balanced equation, we know that for every 2 moles of C2H2 that react, 4 moles of CO2 are produced. Therefore, if we want to produce 1.0 moles of CO2, we need to react 1.0 moles of CO2 / 4 moles CO2/ 2 moles C2H2 = 0.5 moles of C2H2.

To convert moles to grams, we use the molar mass of C2H2 which is 26.03 g/mol

So, 0.5 moles of C2H2 = 0.5 x 26.03 g/mol = 13.015 g C2H2

Therefore 13.015  grams of acetylene (C2H2) are required to produce 1.0 moles of CO2

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Answer:

When substance A is combined with substance B to produce a mixture, the chemical characteristics of one or both substances may alter. The specific characteristics and reactivity of the chemicals involved determine the magnitude and form of these alterations.

Explanation:

Substance A's chemical characteristics may stay constant in some instances, whereas substance B undergoes a chemical reaction or alteration. If substance A is inert, such as sand or sugar, and substance B is reactive, such as acid, the acid may react with or dissolve the sand or sugar, resulting in a chemical change in substance B.

Substance A may, on the other hand, undergo a chemical change while substance B stays intact. This can happen if substance A is reactive or reacts in the presence of substance B. For example, if A is a metal and B is an acid, the metal may undergo a chemical reaction with the acid, resulting in the production of a new compound or gas.

Furthermore, there are circumstances in which both compounds A and B undergo chemical modifications when they are mixed. This can happen when two chemicals react, leading in the production of new compounds or products.

To summaries, when substance A is mixed with substance B, the possibility of chemical property changes exists.

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The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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There were approximately 128.94 g of ZnSO4 and 109.34 g of CoSO4 present in the original solution.

Electroplating is the process of coating a metal object with a thin layer of another metal by means of electrolysis. In an electrolytic cell with a solution of a salt of the metal to be deposited, the item to be plated is made the cathode (negative electrode).

The electroplating of Zn and Co from the solution involves the transfer of electrons from the cathode to the metal ions in the solution, which results in the deposition of the metals on the cathode. The amount of electricity required for this process is proportional to the amount of metal ions present in the solution, which in turn is proportional to the mass of the metals deposited.

Let's first calculate the moles of electrons transferred in the electroplating reaction:

1.436 F × (1 mol e⁻/1 F) = 1.436 mol e⁻

Since the number of electrons transferred is the same for both Zn and Co, the ratio of the moles of Zn and Co deposited should be the same as the ratio of their atomic masses. The atomic masses of Zn and Co are 65.38 g/mol and 58.93 g/mol, respectively, so the ratio of their masses is:

65.38 g/mol ÷ 58.93 g/mol ≈ 1.11

This means that for every 1.11 moles of Zn deposited, 1 mole of Co is deposited.

Let's assume that x moles of ZnSO4 and y moles of CoSO4 were present in the original solution. Then we can set up the following equations based on the balanced electroplating reaction:

2 e⁻ + Zn²+ → Zn (s)

2 e⁻ + Co²+ → Co (s)

The total number of moles of electrons transferred in the electroplating reaction is:

1.436 mol e⁻ = 2 mol e⁻/mol Zn × x mol ZnSO4 + 2 mol e⁻/mol Co × y mol CoSO4

Simplifying and solving for y:

y = (1.436 mol e⁻ - 2 mol e⁻/mol Zn × x mol ZnSO4) / (2 mol e⁻/mol Co)

y = 0.718 mol CoSO4

Since the ratio of the moles of Zn to Co deposited is 1.11, we can calculate the moles of ZnSO4 from the moles of CoSO4:

x = (1.11 mol Zn/mol Co) × (0.718 mol CoSO4) = 0.798 mol ZnSO4

Finally, we can calculate the masses of ZnSO4 and CoSO4:

mass of ZnSO4 = 0.798 mol × 161.47 g/mol = 128.94 g

mass of CoSO4 = 0.718 mol × 152.06 g/mol = 109.34 g

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

use wire nettings

Explanation:

and cages

The pH of the buffer prepared by mixing 35.0 mL of 0.20 M acetic acid and 25.0 mL of 0.100 M NaOH is approximately 4.74.

How to determine pH?

To determine the pH of the buffer solution, we need to calculate the concentration of the acidic and basic components and then apply the Henderson-Hasselbalch equation.

First, calculate the moles of acetic acid:

moles of acetic acid = volume (L) × concentration (M) = 0.035 L × 0.20 M = 0.007 moles

Next, calculate the moles of NaOH:

moles of NaOH = volume (L) × concentration (M) = 0.025 L × 0.100 M = 0.0025 moles

Since NaOH is a strong base, it completely reacts with acetic acid to form sodium acetate (a salt) and water:

CH₃COOH + NaOH → CH₃COONa + H₂O

The remaining moles of acetic acid after neutralization are:

moles of acetic acid remaining = 0.007 moles - 0.0025 moles = 0.0045 moles

Now, we can calculate the concentrations of the acidic and basic components:

[CH₃COOH] = moles of acetic acid remaining / total volume = 0.0045 moles / 0.060 L = 0.075 M

[CH₃COONa] = moles of NaOH / total volume = 0.0025 moles / 0.060 L = 0.042 M

Applying the Henderson-Hasselbalch equation:

pH = pKa + log([CH₃COONa] / [CH₃COOH])

The pKa value for acetic acid is approximately 4.74.

Plugging in the values:

pH = 4.74 + log(0.042 M / 0.075 M) ≈ 4.74

Therefore, the pH of the buffer solution is approximately 4.74.

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The percentage decrease in the amount of dissolved oxygen is 10%

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%. If the actual and theoretical yield ​are the same, the percent yield is 100%

In chemistry, yield is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

From the graph,

The amount of dissolved oxygen at  15°C is 10 mg/L

The amount of dissolved oxygen at  20°C is 9 mg/L

The decrease in the amount of dissolved oxygen is 1mg/L

The percentage decrease = (1/10) × 100 = 10%

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Answer:

2.41 x 10^24 molecules

Explanation:

Answer:

B

Explanation:

Answer: Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light.

Explanation: In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.

Explanation:

We are given different isotopes and we have to identify the number of protons and neutrons that are in the nuclueus of each atom.

a) Carbon-14:

By definition two isotopes are atoms that have the same atomic number but different mass number. The atomic number of an atom is equal to the number of protons of that atom, and the mass number is equal to the number of protons plus the number of neutrons.

atomic number = n° of protons

mass number = n° of protons + n° of neutrons

n° of protons = atomic number

n° of neutrons = mass number - n° of protons

n° of neutrons = mass number - atomic number

If two isotopes have the same atomic number but different mass number we can say that two isotopes have the same number of protons but different number of neutrons.

In we pay attention to carbon-14 we can look for its atomic number in the period table: 6. And its mass number is the one that we are given after the name of the element: 14.

n° of protons = atomic number = 6

n° of protons = 6

n° of neutrons = mass number - atomic number = 14 - 6

n° of neutrons = 8

b) Cobalt-60:

atomic number = 27 (from the periodic table)

mass number = 60

n° of protons = atomic number = 27

n° of protons = 27

n° of neutrons = mass number - atomic number = 60 - 27

n° of neutrons = 33

c) Gold-197:

atomic number = 79 (from the periodic table)

mass number = 197

n° of protons = atomic number = 79

n° of protons = 79

n° of neutrons = mass number - atomic number = 197 - 79

n° of neutrons = 118

d) Uranium-235:

atomic number = 92 (from the periodic table)

mass number = 235

n° of protons = atomic number = 92

n° of protons = 92

n° of neutrons = mass number - atomic number = 235 - 92

n° of neutrons = 143

Answer:

a) Carbon-14: n° of protons = 6 n° of neutrons = 8

b) Cobalt-60: n° of protons = 27 n° of neutrons = 33

c) Gold-197: n° of protons = 79 n° of neutrons = 118

d) Uranium-235: n° of protons = 92 n° of neutrons = 143

Ascorbic acid acts as a coenzyme and is essential for the production of collagen, neurotransmitters, and carnitine.

Collagen is a protein found in skin, bones, and cartilage, and ascorbic acid is necessary for its synthesis. On the other hand, neurotransmitters are chemical messengers in the nervous system, and ascorbic acid is needed for their synthesis.

Lastly, carnitine is a compound that helps transport fatty acids into cells to be used as energy, and ascorbic acid is necessary for its biosynthesis. Therefore, ascorbic acid is an important nutrient that plays a crucial role in several physiological processes in the human body.

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The sprinter's speed after 2 seconds is 9 m/s.

Use the equation of motion to solve this problem:

v = u + at

where

v = final velocity (what we need to find)

u = initial velocity (0 m/s for a stationary object)

a = acceleration (4.5 m/s²)

t = time (2 s)

Plugging in the values:

v = 0 + (4.5 m/s²) × (2 s)

v = 9 m/s

Therefore, the sprinter's speed 2 seconds later is 9 m/s.

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Complete question:

A sprinter leaves the starting blocks with an acceleration of 4.5m/s^2. What is the sprinter's speed 2 s later?

DNA is made up of genes that carry hereditary information

The molecule inside cells that contains the genetic information responsible for the development and function of an organism and DNA molecules allow this information to be passed from one generation to the next generation and a molecule that contains the biological instructions that make each species unique

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Answer:

The strength of the field varies depending on its location around the magnet. The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole.

Explanation: