What is the mass in grams of 4 mol C8H18?

Approximately 0.06 grams of N2 were needed. This number of entities is approximately 6.022 x 10^23 and is known as Avogadro's number.

What is Moles?

Moles are a unit of measurement used in chemistry to express amounts of a chemical substance. One mole is defined as the amount of a substance that contains as many elementary entities (such as atoms, molecules, ions, or electrons) as there are atoms in 12 grams of pure carbon-12.

The balanced chemical equation for the reaction between oxygen and nitrogen is:

N2 + O2 -> 2NO

From the equation, we see that 1 mole of N2 reacts with 1 mole of O2 to produce 2 moles of NO. Therefore, if 0.004 moles of O2 reacted, then we need half as many moles, or 0.002 moles of N2.

To convert moles of N2 to grams, we need to use the molar mass of N2, which is approximately 28 g/mol. Thus, the mass of 0.002 moles of N2 is:

0.002 moles N2 x 28 g/mol = 0.056 g N2

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Answer:

Some thing that is very little and every thing made by

Answer:

Atoms are the basic unit of a chemical element. Atoms are what make up every thing, living and non living alike.

Explanation:

Hope this helps you!

Answer:

Cells help the human body in many ways, Red or white blood cells are very important and are commonly spoken when bringing up cells. Plants have cells as well plant cells have special organelles called chloroplasts, which create sugars also known as photosynthesis.

Explanation:

idrk if that helped much-

Answer:

2OH-(aq) + Fe3+(aq) → Fe(OH)3(s)

Explanation:

The balanced molecular equation for the reaction between calcium hydroxide (Ca(OH)2) and iron(III) chloride (FeCl3) is:

Ca(OH)2(aq) + FeCl3(aq) → Fe(OH)3(s) + CaCl2(aq)

To write the net ionic equation, we first need to break down the soluble reactants and products into their respective ions:

Ca(OH)2(aq) → Ca2+(aq) + 2OH-(aq)

FeCl3(aq) → Fe3+(aq) + 3Cl-(aq)

Fe(OH)3(s) → Fe3+(aq) + 3OH-(aq)

CaCl2(aq) → Ca2+(aq) + 2Cl-(aq)

Next, we need to identify the spectator ions, which are ions that appear on both sides of the equation and do not participate in the reaction. In this case, the spectator ions are Ca2+ and 2Cl-.

Therefore, the net ionic equation is:

2OH-(aq) + Fe3+(aq) → Fe(OH)3(s)

This equation shows the actual chemical change that occurs during the reaction, with only the ions and molecules that participate in the reaction shown.

Answer:

Potassium

Explanation:

In group one of the periodic table both the melting and the boiling points usually decrease down the group.

Now, down the group, it's lithium that comes first, then sodium, then potassium.

Thus, among the 3, potassium is furthermost down the group by virtue of the factor it has the highest atomic number.

Therefore, we can say that potassium has the lowest boiling point among the 3.

Answer:

\(5.1 \div 5.63\)

Absolute dating:

Zircon: A crystal that helps determine the age of an igneous intrusion or layer of a very old specimen.

Meteorites: Help to determine the age of the universe because it is assumed they were around the same time as the Earth was formed

Compression melting: Was likely formed by tectonic and volcanic events

Relative dating: When scientist are simply looking for a logical sequence of events

An igneous intrusion: A crystal that helps determine the age of an igneous intrusion or layer of a very old specimen

Unconformity: When layers are missing from one area to another because of erosion of exposed parts that occurred because of an earthquake or other geological event.

Index fossils: If a fossil is determined to be a certain age, the layer it was found in is likely of the same age.

The Grand Canyon: Was likely entirely formed by a river

Iguazu Falls in Argentina: Was likely formed by glacial forces

Yosemite Valley: The lowest layer of glaciers that lubricate and allows a glacier to move

The statement "An igneous intrusion is always younger than all the layers it cuts through" is true.

The statement "Using radiometric methods to find the approximate age of a layer or fossil" is true.

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The text format of the question goes thus:

Absolute dating

Zircon

Meteorites

Compression melting

Relative dating

An igneous intrusion

Unconformity

Index fossils

The Grand Canyon

Iguazu Falls in Argentina

Yosemite Valley

Carbon 14 dating

Radiometric dating

a. was kkely formed by glacial forces

b. is always younger than all the layers it cuts through

Using the abnormal isotopes inside specimens and using half-life calculations to learn the absolute dates.

d. If a fossil is determined to be a certain age, the layer it

was found in is likely of the same age.

e. Using radiometric methods to find the approximate age

of a layer or fossil

was likely entirely formed by a river

When layers are missing from one are to another because of erosion of exposed parts that occurred because of an earthquake or other geological event.

h was likely formed by tectonic and volcanic events

To learn absolute date of a more recent item.

J. the lowest layer of glaciers that lubricate and allows a

glacier to move k. A crystal that helps determine the age of an igneous intrusion or layer of a very old specimen

When scientist are simply looking for a logical sequence

of events

m. Help to determine the age of the universe because it is

assumed they were around the same time as the Earth

was formed

Answer:

oxygen has six shared electrons

Covalent molecules are the group of atoms that shares a covalent bond. Ammonia is a molecule that shares three pairs or six electrons to form a covalent bond.

Covalent bonds are the intermolecular bonds that mutually involve the sharing of electrons between the two or more atoms of the molecules. In ammonia three pairs of electrons are in a covalent bond.

In an ammonia molecule nitrogen have five electrons in its outer shells and hydrogen have one electron each. When three hydrogen shares their electrons with nitrogen to make a covalent bond the octet of the nitrogen atom is completed.

Therefore, covalent molecule Q is ammonia.

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Particle size is typically measured in units such as micrometers (µm) or nanometers (nm), which represent very small lengths on the order of thousandths or millionths of a meter, respectively.

4.2 cm is much larger than the typical size of particles and is more in the range of everyday objects.

For example, 4.2 cm is roughly the size of a golf ball or a small tomato. If you have additional information about the particle's size, such as its shape or the material it is made of, I may be able to provide more specific guidance.

Also, a particle that is 4.2 nanometers (nm) in size falls in the range of nanoscale particles, which are typically much smaller than everyday objects and are invisible to the nakεd eye.

The size of the particle can provide some clues about its potential identity or classification, but additional information about its properties, composition, and context is needed to determine its specific identity.

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Explanation:

3.Apply the ideal gas law: PV = nRT solving for n. Here you can use the pressure given in atm, but you must choose the 0.0821 atm L/mole K gas constant. Or you can change 4.5 atm to 3420 mm Hg and use the 62.4 mmHg L/mole K gas constant. You must change 500 ml to 0.5 L because both gas constants have units in L, and so the volume must be in liters so it can cancel out. And of course, you must change the temperature to Kelvin.

a. n = (4.5atm)(0.5L)

moliK)(298K) = 0.092 mole (0.0821 atmiL

b. 0.092mol 32g

⎛⎝⎜ ⎞⎠⎟ = 2.9 g

1mol

c. Remember that D = mass

vol so D = 2.9g

0.5L = 5.9 g/L

The answer is that they were were not based on evidence and experiment and that made alchemy unscientific in its practices.

Alchemy is an old practice that might be thought of as a forerunner of chemistry.

The term alchemy is derived from the Arabic al-kimiyya, which is derived from Greek. Alchemy's fundamental notions focus around the transformation of one substance into another, often transforming a basic metal like lead or iron into a "noble" metal like silver or gold

The alchemist's main ambitions were to find the Stone of Knowledge, the medium of Eternal Youth and Health, and metal transmutation.

To conclude with we can say Alchemy is based on magic and occultism rather than true investigation and facts. Many of the items in it have been utilised as fundamentals for certain chemistry, although the vast majority of them are wrong and inaccurate.

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The pressure of the oxygen gas collected : 718 mmHg

Given

P tot = 748 mmHg

P water vapour = 30 mmHg

Required

P Oxygen

Solution

Dalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases

Can be formulated:

P tot = P1 + P2 + P3 ....

The partial pressure is the pressure of each gas in a mixture

P tot = P H₂O + P Oxygen

P Oxygen = 748 mmHg - 30 mmHg

P Oxygen = 718 mmHg

Answer:

As the garter snake can be found almost in any kind of habitat, what makes them be able to survive in any environment include:

1. They hibernate to increase their chances of survival in unfavorable weather conditions.

2. They can blend with the background of any environment especially grass to escape being eaten.

3. They produce an odor that is usually unpleasant especially when about to be attacked.

Explanation:

The garter snakes are distinguished by the three stripes running the length of their body and can often be found in forests, places that are even close to water bodies, and almost any place, even in holes.

Answer:

Because it'll live in the desert!

Explanation:

It probably won't survive on time!

Answer: c

Explanation:

Explanation:

By analyzing the graph the conclusion that can be derived about the location of an electron in a hydrogen atom that is in the ground state is that the greatest probability of locating electron is at a distance of one Bohr radius from the nucleus.

Generally the Bohr radius is described as a physical constant that is used to represent the most probable distance between the electron and nucleus of a hydrogen atom at its ground state (which is the lowest energy level). The constant's value of Bohr radius is symbolized as a₀, and its value is approximately 5.29177210903(80) x 10⁻¹¹ meters (m).

Hence, the greatest probability of locating electron is at a distance of one Bohr radius from the nucleus.

The graph is given is the image attached below.

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The correct answer is "They cause heat to flow from the system to the surroundings." (Option A)

Answer:

Bueno al principio pero empeorando con el paso del tiempo.

Explicación:

La calidad del aire es buena al inicio de la pandemia y hay menos infección en el aire pero con el paso del tiempo la infección se propaga a un ritmo más rápido y la calidad del aire se contamina con la infección que infecta a más personas. La pandemia reduce su intensidad cuando la gente sigue las reglas saludables que previenen la propagación de la pandemia en esa localidad por lo que podemos decir que la última semana de pandemia tiene menor número de pacientes.

Answer:

There are three types of periods in the modern periodic table: very short periods, short periods, and long periods.

The difference between very short periods and short periods is the number of elements they contain. Very short periods only contain two elements, while short periods contain eight elements. The difference between short periods and long periods is the number of orbitals that can be occupied by electrons in each period. Short periods can only have electrons in the s- and p-orbitals, while long periods can also have electrons in the d-orbital.

Here is a table summarizing the differences between very short periods, short periods, and long periods:

Answer:

do you mean DeF?

Explanation:

Answer:

C. Iron oxide is a mixture of iron and oxygen

The mass of neon gas in the balloon is 5.02 grams. If we are holding of the two balloons of the same volume.

If the two balloons have the same volume, then the same amount of gas is present in both balloons. Therefore, the mass of neon in the second balloon can be calculated using the molar mass ratio of neon to helium.

The molar mass of helium is 4.003 g/mol, while the molar mass of neon is 20.180 g/mol. This means that one mole of neon has a mass that is 20.180/4.003 = 5.02 times greater than one mole of helium.

Since the first balloon contains 1.0 g of helium, which has a molar mass of 4.003 g/mol, it contains 1.0/4.003 = 0.2497 moles of helium.

Since the second balloon contains the same amount of gas as the first balloon, it must also contain 0.2497 moles of gas. Since one mole of neon has a mass that is 5.02 times greater than one mole of helium, the mass of neon in the second balloon is:

mass of neon = mass of helium x (molar mass of neon/molar mass of helium)

mass of neon = 1.0 g x (20.180/4.003)

mass of neon = 5.02 g

Therefore, the mass of neon in the second balloon is 5.02 g.

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Answer:

C. single replacement

Explanation:

In a single replacement reaction, one atom replaces another.

The general form of a single replacement reaction is: A + Bc ⇒ Ac + B

A   +  B  ×  c      ⇒   B   +  A × c

↓       ↓      ↓            ↓       ↓    ↓

Fe +  Pb(NO₃)₂ ⇒  Pb  + Fe(NO₃)₂

Iron switched places with lead so the reaction is a single replacement reaction.

Hope this helps.

Ka is the acid dissociation constant of a weak acid, and it represents the extent to which the acid dissociates in water.

In the context of titration, the half-equivalence point is the point at which half of the analyte (weak acid) has reacted with the titrant (usually a strong base) to form its conjugate base.

To determine the half-equivalence point, you need the initial amount of the weak acid and its dissociation constant (Ka). However, you have only mentioned the value 0.420 moles, which is not clear whether it represents the initial moles of the weak acid or the Ka value.

If 0.420 moles is the initial moles of the weak acid (let's call it HA), and assuming the reaction is HA + OH- → A- + H2O, you can determine the concentration of the weak acid at the half-equivalence point using the Henderson-Hasselbalch equation:

pH = pKa + log ([A-] / [HA])

At the half-equivalence point, [A-] = [HA] since half of the weak acid has reacted to form its conjugate base. Therefore, the equation simplifies to:

pH = pKa + log(1)

Since log(1) equals 0, the equation further simplifies to:

pH = pKa

So, at the half-equivalence point, the pH of the solution will be equal to the negative logarithm of the acid dissociation constant (pKa).

If you have the Ka value of the weak acid, please provide it so that I can assist you further in determining the concentration or pH at the half-equivalence point.

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Complete question: the half‑equivalence point of a titration occurs half way to the equivalence point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.if 0.420 moles of a monoprotic weak acid (Ka value) or the concentration of the conjugate base formed at the half-equivalence point.

The first ionization energy of magnesium is larger than that of sodium because magnesium has one more proton present in its nucleus to hold on to the electrons in the 3s orbital.

First ionization energy is defined as the energy that is required to remove the first electron from a neutral atom. First ionization energy is numerically same as the orbital energy of the electron but it is of opposite sign.

The second I.E is so much greater for Na than for Mg because after losing its one electron it becomes more stable by attaining noble gas configuration and hence more enthalpy is required to remove an electron from the stable atom.

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Explanation:

The closest orbital to the nucleus, called the 1s orbital, can hold up to two electrons. This orbital is equivalent to the innermost electron shell of the Bohr model of the atom. It is called the 1s orbital because it is spherical around the nucleus.

Answer:

a)Carbon (iv) oxide; CO₂

b)It is used in fire extinguishers

c) i. It is denser than air

ii. It dissolves in water to form an acidic solution

Explanation:

a) Since the compound P is composed of one atom of carbon and two atoms of oxygen, the formula of the compound is CO₂. The name of the compound is carbon(iv) oxide.

b) Carbon (iv) oxide is a gas that is of great importance to living organisms. Plants require it for photosynthesis while human produce it during the process of respiration.

Industrially, it is used in carbonated drinks. It is also used in fire extinguishers

c) The properties of Carbon (iv) oxide include the following:

i) it is an odourless colorless gas

ii) it is denser than air

iii) it dissolves in water to form a weak acidic solution, etc.

The speed of the particles rises with the temperature of the solid, liquid, or gas. The particles slow down with decreasing temperature.

A liquid can turn into a solid if it is cooled down far enough.

The average kinetic energy of the molecules falls as a liquid cools.

The liquid eventually turns into a solid when the quantity of heat removed is sufficient to cause the molecules to be attracted to one another.

Freezing is the process of transitioning from a liquid to a solid.

It loses thermal energy when the liquid cools. Its constituent particles therefore decelerate down and converge.

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The correct answer for the first question is e) none of the above determines if product forms. For the second question, the correct answer is a) lower the free energy of activation to a value below the free energy of the reactants and products.

Adding an enzyme to a solution containing only the product(s) of a reaction will not lead to the formation of substrate. Enzymes are highly specific catalysts that facilitate the conversion of substrate(s) into product(s) by lowering the activation energy required for the reaction.

However, enzymes do not have the ability to generate substrate from products alone. Substrate availability is crucial for the enzyme to catalyze a reaction.

As for the second question, the correct answer is a) lower the free energy of activation to a value below the free energy of the reactants and products. Enzymes work by lowering the activation energy required for a reaction to occur, enabling the reaction to proceed more readily.

By doing so, enzymes facilitate the conversion of substrates into products by reducing the energy barrier (activation energy) that needs to be overcome. This allows the reaction to occur at a faster rate and under milder conditions compared to the uncatalyzed reaction.

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