Which one of the following is NOT equal to 1 mole?

6.02 x 1023 atoms of carbon

6.02 x 1023 molecules of oxygen

14.0 grams of nitrogen

26.0 grams of calcium

Answer:

Explanation:

A

1-Bromobutane reacts with water to form 1-butanol according to the following equation overall rate law for this proposed mechanism is rate = k [C₄H₉Br]

The reaction intermediate in the chemical species that is formed in one elementary step and consumed in subsequent step and the slowest step in the reaction mechanism is rate determining step and the rate determining step limit the overall rate and therefore determines the rate law for the overall reaction

Here given reaction

C₄H₉Br(aq) + 2H₂O(l) → C₄H₉OH(aq) + H₃O⁺(aq) + Br⁻(aq)

And the following is a proposed mechanism for the reaction

C₄H₉Br(aq) → C₄H₉⁺(aq) + Br⁻(aq)     slow

C₄H₉⁺(aq) + H₂O(l) → C₄H₉OH₂⁺(aq)   fast

C₄H₉OH₂⁺(aq) + H₂O(l) → C₄H₉OH(aq) + H₃O⁺(aq)   fast

So in that 1st step is the rate determining step means slow step

So rate expressions take the general form: rate = k . [A]a . [B]b

So given equation rate expressions is k [C₄H₉Br]

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Answer:

true

Explanation:

The physical and chemical composition of matter determines which wavelength (or color) is reflected.

The total mass of the mixture is 80.5 g. The analysis of the calculation shows that there should be three significant figures in the end result.

This is an addition operation, and when dealing with addition and subtraction operations it is necessary to consider the last significant figure for each of the numbers. The result of the addition/subtraction should have the same last significant figure as the number with the leftmost (or highest) last significant figure. When applied to this calculation, the principle looks like this:

30.05 - the last significant figure is 5, and it is in the hundredths

50.0 - the last significant figure is 0, in the tenths

0.4006 - the last significant figure is 6, in the ten thousandths.

Of the three, the leftmost/highest significant figure is 0 in the tenths, so the end result should also have its last significant figure in the tenths.

30.05 g + 50.0 g + 0.4006 g = 80.4506 g, but we round up to the tenths, and because the numbers after 5 are greater than 0, we have to round up to reach the end result of 80.5 g

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Answer:

Oxygen

Explanation:

The 1st 2 are compounds

The last one "air" can be used to say oxygen, however, "air" is not on the periodic table of elements.

Oxygen is on the periodic table of elements

When the temperature of a gas decrease the pressure also decrease. That is option B.

Temperature is defined as the quantity that measures the degree of how hot or cold an object or medium is.

When the temperature of a medium increases there would be increase in the collision between the molecules that is found in the medium.

The increase in intermolecular collision leads to increase in pressure of the medium. Subsequently, when there is decrease in temperature, the pressure of the medium also falls.

Therefore, it can be said that the temperature of a gas decreases which causes the pressure to also decrease.

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The balanced chemical equation of the reaction between aluminum metal with aqueous sulfuric acid to form aqueous aluminum sulfate and hydrogen gas is 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂.

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, aluminum metal reacts with aqueous sulfuric acid to form aqueous aluminum sulfate and hydrogen gas.

This reaction will be balanced only if the atoms of each element on both sides of the equation are the same. The chemical reaction is as follows:

2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂.

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Answer:

- Kinetic energy is the energy possessed by a moving body....so this energy is independent of the distance travelled since the body is still in motion.

- To calculate kinetic energy, the formula below applies;

[tex]{ \boxed{ \rm{ \: kinetic \: energy = \frac{1}{2} {mv}^{2} }}}[/tex]

- From the values given;

[tex]{ \rm{kinetic \: energy = \frac{1}{2} \times 25 \times {10.0}^{2} }} \\ \\ = { \rm{25 \times 50}} \\ \\ ={ \: \: \underline{ \underline { \rm{ \: \: \: 1250 \: joules \: \: \: }}}}[/tex]

The kinetic energy of the object is 1250 Joules

Given:

Mass of the body       (m)  = 25 kg

Velocity of the body   (v)  = 10 m/s

Kinetic energy is the energy possessed by a body because of its motion.

The formula for kinetic energy is as follows :

Kinetic energy ( K.E) = [tex]1/2 ( mv^{2} )[/tex]

By substituting the values in the above equation we get:

Kinetic energy = 1/2 × 25 × [tex]10^{2}[/tex]

Kinetic energy = 1250 Joules

Hence the kinetic energy of the body travelling at 10 m/s is calculated as 1250 Joules

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If the gases are ideal and the end pressure is the same as the initial pressure, the partial pressures are PA=nART/(VA+VB) and PB=nBRT/(VA+VB), respectively.

If the gases are ideal and the end pressure is the same as the initial pressure, the partial pressures are PA=nART/(VA+VB) and PB=nBRT/(VA+VB), respectively.

There are two ways to calculate partial pressures: 1) To determine the individual pressure of each gas in a mixture, use PV = nRT. 2) Determine the proportion of the total pressure that may be assigned to each individual gas using the mole fraction of each gas.

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The word that best fits the definition of "people who do not work for a formal business" is informal sector.

A formal definition can be defined as a process which typically involves providing all of the information (details) pertaining to a particular word or phrase, especially in a concise and standard format.

An informal sector can be defined as a word which is used to describe a group of workers that do not work for a formal business (regulated economic activities), including entrepreneurs, self-employed persons, and small family businesses.

In conclusion, some examples of persons working in the informal sector are car repairs, graphic designers, home renovations, etc.

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Gallium has two naturally occurring isotopes: 69ga with a mass of 68.9256 amu and a natural abundance of 60.11% and 71ga. Using the mass of gallium from the periodic table,  the mass of Ga-71 isotope is 70.9246 amu.

There are two naturally occurring isotopes of gallium: Ga-69 isotope having mass 68.9256 and percentage abundance is  60.11%, let say 'X' be the mass of  isotope - Ga-71.

Its percentage abundance can be calculated as:

%Ga-71=100-60.11=39.89%

The atomic mass of an element can be calculated by adding the atomic masses of its isotopes multiplied by their percentage abundance.

In this case we have

Atomic mass = m(Ga-69)×%(Ga-69) + X ×%(Ga-71)

The atomic mass of Ga is 69.723 amu.

Now putting the values, we will get

69.723 amu = (68.9256amu)(60.11/100) + X (39.89/100)

Hence,

69.723 amu = 41.431amu + + X (39.89/100)

Now rearranging the above equation we get,

X = 69.723 amu -  41.431amu/0.3989 = 70.9246amu

Thus, the mass of Ga-71 isotope is 70.9246 amu.

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The complete question is:

Gallium has two naturally occurring isotopes: 69ga with a mass of 68.9256 amu and a natural abundance of 60.11% and 71ga. use the atomic mass of gallium from the periodic table to find the mass of gallium-71. express the mass in atomic mass units to two decimal.

The pressure of the CO₂ collected in atm is 0.965 atm.

We need to know about pressure to solve this problem. Pressure is unit that describe how much force applied on a surface area. It can be determined as

P = F / A

where P is pressure, F is force and A is area.

From the question above, we know that

Pvapor = 18.65 torr

P = 752 torr

From partial pressure, we can conclude that

P = Pco₂ + P vapor

752 = Pco₂ + 18.65

Pco₂ = 752 - 18.65

Pco₂ = 733.35 torr

Convert to atm

Pco₂ = 733.35 torr

Pco₂ = 733.35/760 atm

Pco₂ = 0.965 atm

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The stages of a cell's lifecycle are prophase, prometaphase, metaphase, anaphase, and telophase.

The cell cycle is a sequence of events that arise in a cell as it develops and splits. Cells expend most of their period in the interphase, where they expand, replicate chromosomes, and prepare for cell division.

The cell then exits the interphase and experiences mitosis to conclude division. The consequential cells, known as daughter cells, enter the interphase and initiate a new cell cycle.

The cell cycle is the name a cell gives to the procedure by which it replicates and produces two new cells.

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The proton determines the identity of an element.

The number of protons in an atom determines the identity of that element. No element has the same number of protons in its atoms. The number of protons in an atom is called the atomic number of the element. Therefore, each element has a unique atomic number. The identity of an element is determined by the number of protons in it. You cannot change the number of protons without changing the ID of the element.

Adding a proton increases the atomic number by 1 and changes the identity of the element. You can create isotopes by changing the number of neutrons. The number of protons is very important in an atom as it gives it its identity. Atoms with only one proton are identified as hydrogen atoms. Atoms with 6 protons are identified as carbon atoms. The number of protons in an atom determines the identity of that element.

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1990, scientist Ernest Rutherford, directed a steam of alpha particles at a thin gold foil. He drew the conclusions about the Nucleus of the atom and the arrangement of the particles in atom.

He directed a stream of alpha particles towards a very thin gold foil. Some of the particles passed through, some were deflected, and some were bounced back straight. This result caused Rutherford to conclude that,

As the alpha particles were large particles, a large amount of mass was needed to deflect the alpha particles from it's path. He concluded that most of the mass of the atom is concentrate inside a small portion of the atom. He termed this portion as nucleus of the atom.

Some particles went non deflected, some were deflected by small angles and only few came back in a straight path. From this information he concluded that most of the portion of the atom is empty. This observation is indeed proven true in subsequent times.

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Answer:

Mesosphere. This layer extends from around 31 miles (50 km) above the Earth's surface to 53 miles (85 km). The gases, including the oxygen molecules, continue to become denser as one descends. As such, temperatures increase as one descends rising to about 5°F (-15°C) near the bottom of this layer.

Explanation:

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Answer:

The product is hydrogen.

Explanation:

Answer: the number of protons minus the number of electrons

Explanation:

For any particular electron donor the most free energy will be released when molecular oxygen serves as the electron acceptor because molecular oxygen is a stronger electron acceptor then most other available electron acceptors.

Oxygen is a highly electronegative due to its size. Its high electronegativity increases the electron affinity of oxygen to a very large extent.

At the end of the electron transport chain, most of the electron loses their energy when molecular oxygen serves as the electron acceptor.

Because at the end of the electron transport chain, water can easily form hydronium ion by combining readily with Hydrogen (H+).

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Answer:

A.

Explanation:

Radioactive atoms have unstable nuclei

Lewis structures are diagrams that illustrate the bonding between atoms in a molecule as well as any lone pairs of electrons that may exist. They are also known as Lewis dot formulae, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs). Lewis structures are diagrams that illustrate the bonding between atoms in a molecule as well as any lone pairs of electrons that may exist. They are also known as Lewis dot formulae, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs). A Lewis structure can represent any covalently attached molecule as well as coordination compounds. who proposed it in his 1916 article The Atom and the Molecule.

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Since it dissociates almost entirely, HCl is a powerful acid.

In contrary, a weak acid like acetic acid (CH3COOH) does not dissociate well in water because it retains a large number of bound-up H+ ions.

Acetic acid splits into CH3COO, and H+.

In conclusion, the amount of free H+ ions discharged into solution increases with acid strength. The pH value for that acid is inversely correlated with the amount of free H+.

Because they allow other molecules to bind to H+ ions in solution, acids are frequently referred to as H+ ion donors.

Any acid that is entirely ionized in an aqueous solution is considered to be strong. When present in water, hydrogen chloride (HCl) totally ionizes to produce hydrogen and chloride ions.

Weak acid is one that ionizes very little in an aqueous solution. A very well-liked weak acid that is present in vinegar is acetic acid.

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The correct lewis structural formula of the compound thionyl chloride from the structure above is one with two single bonds between sulphur and chlorine atom, one double bond between sulphur and oxygen, and one lone electron pair on the central atom.

The correct image is attached.

The structure of this substance simply refers to the structural composition of atoms and representing the substance.

In the context of the above question, thionyl chloride contains double bonds, single bond and also a lone pair electron.

This substance mentioned in the task above is used chlorinating agent.

Double bond is a covalent bond between two atoms involving four bonding electrons instead of two in a single bond.

So therefore, thionyl chloride lewis structure contains two single bond each between sulphur and chlorine atom and also two double bond between sulphur and oxygen atoms.

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Answer:

Yes, energy can be released when matter changes. In physical changes, such as phase changes, energy is released when changing from a higher energy state to a lower energy state. An example of this is when gaseous water condenses into the liquid phase.

Yes, energy is always either released or absorbed during a chemical reaction. This is because all chemical reactions involve energy. In any chemical reaction, energy is required to break the bonds in reactions, and energy is released when new bonds form after the reaction.

And no energy cannot change in matter or take place in which energy is neither releasedreased nor absorbed.

Explanation:

Property could be used to separate a mixture of salt and sand is solubility in water

Salt and sand mixture can be separated by filtration followed by an evaporation process

To separate the salt and sugar based on the solubility and the substances is soluble that means it dissolved in solvent and salt is ionic compound that means soluble in water

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The electron orbit, is the path of an electron around the nucleus of an atom.

Explanation:

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The temperature of 1.585 K is required for 5 moles of Helium at a pressure of 760 torrs and volume of 650 mL.

The Ideal Gas Equation is the equation for hypothetical gases expressed mathematically by combining empirical and physical constants and is also known as the general gas equation.

The ideal gas equation can be represented for gas as:

PV = nRT

Where P is the pressure, V is the volume, n is the amount of ideal gas  (in moles), R is the gas constant and T is the temperature (in Kelvin) of the ideal gas.

Given, the pressure of helium gas, P = 760 torr = 1 atm

The volume of helium gas = 650 ml = 0.65 L

The number of moles of helium gas, n = 5

The value of the gas constant, R = 0.082 L atm /K mol

Substitute the values in the ideal gas equation:

(1atm) × (0.65 L) = (5 mol) ×(0.0832 L atm /K mol) × T

T = 1.585 K

Therefore, the temperature of the helium gas at a given presurre and volume is equal to 1.585 K.

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Option (a) Ca, Mn, Co are paramagnetic elements in the fourth period of the periodic table due to unpaired electrons.

A substance's electron configuration can be used to assess if it has magnetic properties: The material is paramagnetic if any of its electrons are unpaired, and it is diamagnetic if all of its electrons are paired.

Materials with hindered electrons that are drawn to magnetic fields are considered to be paramagnetic. In the absence of a magnetic field, they become less magnetic. The magnetic moment of the material and, consequently, the paramagnetism, increase with the number of unpaired electrons.

[tex]Mn^{2+}[/tex] is the ion with the most paramagnetic behaviour because it has the most unpaired electrons when two electrons are lost.

In this instance, calcium is a paramagnetic element as well. This is an anomaly. Due to the ability of one of calcium's electrons in the S orbital to jump to the D orbital, the element is paramagnetic. Since calcium is in Period 4, its D orbital is unoccupied. D orbitals exist in elements with period 4. Thus, this provides that electron with a destination.

Three electrons are not paired in cobalt. It is hence paramagnetic. Three unpaired electrons are present in the outermost subshell.

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