Cobalt-60 can be used by scientists for the purpose of radioactive dating. Cobalt-60 has a half-life of 5,272 years. A fossilized rock originally contained 25 grams of Co-60. When tested, the rock only contains 6.25 grams of Co-60. Approximately how old is the item?

A) 2,600 years

B) 5,200 years

C) 10,500 years

D) 15,600 years
the correct answer is C

Considering the definition of pH, the pH of an acid solution containing 0.10 M HNO₃ is 1.  

You need to know that pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

On the other side, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid equals the concentration of hydrogen ions.

In this case, HNO₃ is a strong acid, so:

[HNO₃]= [H⁺]= 0.10 M

So the pH can be calculated as:

pH= - log (0.10 M)

Solving:

pH= 1

Finally, the pH of an acid solution containing 0.10 M HNO₃ is 1.

Learn more:

The pH of a solution can be calculated using the formula pH = -log [H3O+]. In this case, the pH of a 0.10 M HNO3 acid solution would be 1.0 because HNO3 completely dissociates in water, and the hydronium ion concentration is 0.10 M.

This problem pertains to the field of acids and bases, specifically dealing with the concept of pH. The pH of a solution can be calculated using the formula pH = -log [H3O+], where [H3O+] stands for the hydronium ion concentration. Bear in mind that for a strong monoprotic acid such as HNO3, the concentration of this acid equals the concentration of hydronium ions due to its complete dissociation in water.

In this case, [H3O+] equals 0.10 M, the same as the concentration of HNO3. Now, substituting this into the pH formula gives us pH = -log(0.10), which simplifies to a pH of 1. This means the pH of a 0.1M HNO3 solution would be 1.0.

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Answer:

The pics aern't loading on my computer, but its the one with the grey-ish spiral around a bright center. It's the vertical-ish one

Explanation:

The balanced equation for the reaction between pentane (C₅H₁₂) and oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) is:

The equation for the reaction between pentane and oxygen to produce carbon dioxide and water can be written as follow:

Pentane => C₅H₁₂

Oxygen => O₂

Carbon dioxide => CO₂  

Water => H₂O

Pentane + Oxygen —> Carbon dioxide + Water

C₅H₁₂ + O₂ —> CO₂ + H₂O

The above equation can be balance as follow:

C₅H₁₂ + O₂ —> CO₂ + H₂O

There are 5 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 5 before CO₂ as shown below:

C₅H₁₂ + O₂ —> 5CO₂ + H₂O

There are 12 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 6 before H₂O as shown below:

C₅H₁₂ + O₂ —> 5CO₂ + 6H₂O

There are 2 atoms of O on the left side and a total of 16 atoms on the right side. It can be balance by writing 8 before O₂ as shown below:

C₅H₁₂ + 8O₂ —> 5CO₂ + 6H₂O

Now, the equation is balanced.

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Answer:

the answer is C

Explanation:

edge 2023

Answer:

Matter

Explanation:

Matter is the physical object

Sound: not physical

Energy: Not physical

Light: not physical

Answer:

New material

Explanation:

Answer:

A. Apollo

Explanation:

Apollo 11 then six other trips to the moon was followed after that. Apollo 17 was the last one.

Answer:

Apollo

Explanation:

The equation for the decay of kr-85 is [tex]\[ ^{85}\text{Kr} \rightarrow ^{85}\text{Rb} + \beta^- + \bar{\nu}_e \][/tex]

Krypton 85 [tex](\( ^{85}\text{Kr} \))[/tex] decays through beta emission. The decay equation for this process is:

[tex]\[ ^{85}\text{Kr} \rightarrow ^{85}\text{Rb} + \beta^- + \bar{\nu}_e \][/tex]

Where:

Answer:

See below.

Explanation:

CH3CH2CH2CH2OH is butanol.

The carboxylic acid formed , butyric acid has the formula:

CH3CH2CH2COOH.

Structural formula:

       H     H    H       O                  

        |       |      |        ||                      

H  -  C  -  C  -  C   -  C  -  OH

       |       |       |    

      H     H     H

The answer is in the photo attached.

The volume of ethane at STP has been 136,6 L. The volume of gas at 100[tex]\rm ^\circ C[/tex] has been 186,6 L.

STP has been the state of standard temperature and pressure. At STP, the temperature has been 273.15 K, while the pressure has been 1 atm.

Assuming ethane has been an ideal gas:

PV = nRT

P = pressure = 1 atm

V = volume

n = moles = 6.1

R = constant = 0.08206 atm.L/mol.K

T = temperature = 273.15 K

Substituting the values:

Volume = 6.1 mol × 0.08206 atm.L/mol.K × 273.15 K

Volume = 136,6 L.

The volume of ethane at STP has been 136,6 L.

Considering the temperature of the gas being 100[tex]\rm ^\circ C[/tex]:

Temperature = 373.15 K

Volume =  6.1 mol × 0.08206 atm.L/mol.K × 373.15 K

Volume = 186,6 L.

The volume of gas at 100[tex]\rm ^\circ C[/tex] has been 186,6 L.

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The star life cycle that is accurate is A. Star of one stellar mass, red giant, planetary nebula, white dwarf.

It should be noted that the life cycle of a star is determined by its mass. The life cycle of a star includes a star of one stellar mass, red giant, planetary nebula, and white dwarf.

It should be noted that a star of one stellar mass is the smallest while the white dwarf is the biggest. The white dwarf is also referred to as the degenerate dwarf and it is very dense and its mass is as being as that of the sun.

In conclusion, the correct option is Star of one stellar mass, red giant, planetary nebula, white dwarf.

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Answer:

A

Explanation:

Answer: this is a completer guess and i no nothing about this but i thing Sg and Bh because they both have almost the exact same numbers. like i said its a guess sorry if im wrong

Hope this helps have a nice day :)

Elements in the same group of the periodic table, such as lithium and sodium, usually have similar properties. These properties stem from the same number of electrons in their outermost shell.

In the periodic table, elements that are in the same group (vertical column) often have similar properties. This is because they have the same number of electrons in their outermost shell, which determines their chemical behavior. For instance, lithium (Li) and sodium (Na) are both in Group 1, and they share similar characteristics: they are highly reactive metals that react with water to produce hydrogen gas. These elements have a single electron in their outermost shell, which makes them eager to donate that electron in reactions, leading to similar chemical properties.

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Answer:

1fertilize

2. gene

3. uterus

4. conception

5.chromosomes

6. deoxyribonucleic acid

7. zygote

Answer:

1. To unite a male reproductive cell with a female reproductive cell ---Fertilize

2. A new cell formed from two cells at fertilization --- Zygote

3. A special, muscular organ inside a mother that protects a developing embryo --- Uterus

4. The fertilization of female egg cell with a male sperm cell --- Conception

5. Strings of DNA in cell nuclei --- Chromosomes

6. The genetic material that determines the nature of life forms --- Deoxyribonucleic acid

7. The code for a particular characteristic of a living organism --- Gene

Explanation:

1- Fertilization is the process by which two gametes fuse during sexual reproduction to create a new individual with a genome derived from both parents.

2- In biology, the cell resulting from the union of the male gamete with the female gamete in the sexual reproduction of organisms is called zygote.

3- The uterus is the organ of gestation and the largest organ of the female reproductive system of most mammals, including humans. It is a muscular, hollow, pear-shaped, infraperitoneal organ located in the lower pelvis of the woman who, when adopting the position in anteversion, leans on the urinary bladder in front, with the rectum behind. It lodges the blastula, that is implanted in the endometrium, giving beginning to the gestation.

4- The term conception refers to the action and effect of conceiving. In biology, it is the fusion of two sex cells to give rise to the zygote cell, where the union of the chromosomes of male and female is found.

5- In biology and cytogenetics, it is called chromosome to each of the highly organized structures, consisting of DNA and proteins, which contains most of the genetic information of a living being.

6- Deoxyribonucleic acid, abbreviated as DNA, is a nucleic acid that contains the genetic instructions used in the development and functioning of all living organisms and some viruses; He is also responsible for the hereditary transmission.

7- A gene is an information unit in a deoxyribonucleic acid locus that encodes a functional product, such as proteins. It is the molecular unit of genetic inheritance, because it stores genetic information and allows it to be transmitted to offspring.

Cell potential is defined as D. difference between reduction potentials of half cells.

The cell potential is calculated by taking the difference in the half reaction which is reductive and the half reaction which is oxidative.

Symbolically: E°cell = E°cathode − E°anode

Under standard temperature and pressure condition, the standard cell potential of hydrogen electrode is 0 V. The cell potential is obtained by subtracting because it is impossible to measure the exact single electrode potential hence it is measured in the form of difference.

Answer:

1. [OH⁻] = 2.4 x 10⁻¹⁴ M.

2. [H₃O⁺] = 4.167 x 10⁻¹ M.

Explanation:

Firstly, we need to calculate the molarity of Mg(OH)₂:

M = (no. of moles of solute)/(V of the solution (L).

∴ M of MgCl₂ = (no. of moles of solute)/(V of the solution (L) = (1.2 x 10⁻¹⁴ mol)/(1.0 L) = 1.2 x 10⁻¹⁴ M.

1. [OH⁻]:

Mg(OH)₂ → Mg²⁺ + 2OH⁻.

∴ [OH⁻] = 2(1.2 x 10⁻¹⁴) = 2.4 x 10⁻¹⁴ M.

2. [H₃O⁺]:

∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.

∴ [H₃O⁺] = 10⁻¹⁴/[OH⁻] = 10⁻¹⁴/(2.4 x 10⁻¹⁴ M) = 4.167 x 10⁻¹ M.

Answer: Accountant!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation:

Accountant careers is most likely to involve preparing tax returns for individuals

A individual who practices accounting or accountancy is called an accountant. Accountants may be using titles like "Chartered Accountant," "Chartered Certified Accountant," "Chartered Accountant," or "Registered Public Accountant" after passing certification tests provided by respective professional associations. These experts may be made responsible for professional wrongdoing and are given specific duties by legislation, such as the authority to verify a company's monetary accounts. Non-qualified accountants have no statutory privileges or obligations and are free to operate independently or in the employ of a competent accountant.

Certified Public Accountants (CPAs) and Public Accountants are the two designations for licensed accountants in the United States (PAs). Certified Management Accountants (CMAs) and Certified Internal Auditors (CIAs) are examples of unlicensed accountants (CMAs). Although individuals may get many certificates, the main distinctions between them are their legal standing and the kinds of services they offer. In addition, a lot of accounting work is done by uncertified people who can be working under a certified accountant's supervision. As was already said, the majority of accountants are employed by private companies or are free to provide their services without being certified.

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Answer:

Well, the heat makes the molucules move faster. And the liquid evaparetes.

[I can write a better one thought ^_^]

Explanation:

Answer:

the heat makes the molucules move faster. And the liquid evaparetes.

Explanation:

Answer:

38.36 L.

Explanation:

where, P is the pressure of H₂ in atm (P = 1.0 atm, STP conditions).

V is the volume of H₂ in L (V = ??? L).

n is the no. of moles of H₂ in mol (n = mass/molar mass = (10.0 g)/(2.0 g/mol) = 5.0 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of H₂ in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

∴ V = nRT/P = (5.0 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 38.36 L.

Answer:

The hot tea should transfer 25.63 kJ the surroundings to cool the tea.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat has to be transferred from the tea to the surroundings to cool the tea (Q = ??? J).

m is the mass of the hot tea (m = dV = (1.0 g/mL)(250 mL) = 250 g), suppose the density of water is the density of tea.

c is the specific heat of the hot tea (c = 4.10 J/°C.g).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 350 K - 375 K = -25°C).

∴ Q = m.c.ΔT = (250 g)(4.10 J/°C.g)(-25°C)) = - 25630 J = - 25.63 kJ.

So, the hot tea should transfer 25.63 kJ the surroundings to cool the tea.

Answer:

Ionic polarization. As the name suggests, ionic polarization occurs in ionic materials. It occurs when an electric field is applied to an ionic material then cations and anions get displaced in opposite directions giving rise to a net dipole moment

Explanation:

Answer:

The first person that answered your question is right.

Explanation:

Mark her Brainliest

Answer:

Microwave is Electromagnetic, as is radio wave, ocean is mechanical, s is seismic. A mechanical wave requires an initial energy input. Once this initial energy is added, the wave travels through the medium until all its energy is transferred. In contrast, electromagnetic waves require no medium, but can still travel through one. Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.

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Explanation:

Waves are either mechanical or electromagnetic. Mechanical waves require a medium to propagate and can be longitudinal or transverse, like sound waves and waves from a tuning fork. Electromagnetic waves, such as light, do not need a medium and can travel through a vacuum.

To classify waves as either mechanical or electromagnetic, it is essential to understand their fundamental characteristics and how they propagate. Mechanical waves, like the ripples created in water from a stone's impact or the waves coming from a tuning fork, need a medium (like air, water, or solids) to travel through. These waves can be longitudinal, where the disturbance occurs in the same direction as the wave's propagation, or transverse, where the disturbance is perpendicular to the direction of wave propagation.

On the other hand, electromagnetic waves comprise oscillating electric and magnetic fields and can propagate through a vacuum. The classic example of an electromagnetic wave is light, which can travel through empty space and does not require a medium.

Examples of mechanical waves include sound waves and seismic waves, while examples of electromagnetic waves include light waves, radio waves, and X-rays. Maxwell's equations offer further insight into the behavior of electromagnetic waves, predicting their properties and the speed at which they travel.

Answer:

Solvent is the that part of solution which is present in large proportion and have ability to dissolve the solute.

Explanation:

Definition:

Solvent is the that part of solution which is present in large proportion and have ability to dissolve the solute. In simplest form it is something in which other substance get dissolve. The most widely used solvent is water, other examples are toluene, acetone, ethanol, chloroform etc.

Water is called universal solvent because of high polarity all polar substance are dissolve in it. Hydrogen is less electronegative while oxygen is more electronegative and because of difference in electronegativity hydrogen carry the partial positive charge while oxygen carry partial negative charge.

Water create electrostatic interaction with other polar molecules. The negative end of water attract the positive end of polar molecules and positive end of water attract negative end of polar substance and in this way polar substance get dissolve in it.

Example:

when we stir the sodium chloride into water the cation Na⁺ ions are surrounded by the negative end of water i.e oxygen and anion Cl⁻ is surrounded by the positive end of water i.e hydrogen and in this way all salt is get dissolved.

The reactants are Mg (s) +HCl (aq)

Answer:

The right choice is → alkane

Explanation:

Alkane, alkene , alkyne, and aldehyde all are organic compounds with different formula.

Alkane has  a general formula : CₙH₂ₙ₊₂

Alkene has  a general formula : CₙH₂ₙ

Alkyne has  a general formula : CₙH₂ₙ₋₂

while, Aldehyde has a -CHO functional group.

in the given example Butane C₄H₁₀ it has the general formula C₄H₂.₍₄₎₊₂

So, the right choice is: → alkane

Answer:

1.654 atm.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R  is the general gas constant,

T is the temperature of the gas in K.

(P₁T₂) = (P₂T₁)

P₁ = 1.0 atm, T₁ = 25°C + 273 = 298 K,

P₂ = ??? atm, T₂ = 220°C + 273 = 493 K,

(P₁T₂) = (P₂T₁)

∴ P₂ = (P₁T₂)/(T₁) = (1.0 atm)(493 K)/(298 K) = 1.654 atm.

Answer:

Explanation:well like greenhouse gases and other gases lets see... for example!the atmosphere is mainly made up of nitrogen and oxygen but contains about 0.04 percent of carbon dioxide! thank you and i hope thats right!!! :D

The entropy of a system decreases when a gas condenses into a liquid, which corresponds to option B. a gas condensing. This reflects the second law of thermodynamics where the total entropy of the universe still increases while local decreases are possible with energy transfer.

Entropy is a measure of disorder or randomness in a system, and it is an important concept in thermodynamics. In the question presented, the process in which entropy decreases is the condensation of gas into a liquid or solid. Therefore, the correct answer to which system sees a decrease in entropy is B. a gas condensing.

For example, when water vapor condenses on a cold surface, it goes from a disorderly gas phase to a more ordered liquid phase, which means that its entropy decreases. Energy transfer is necessary for the entropy of a system to decrease. This is consistent with the Second Law of Thermodynamics, which states that for the entropy of a system to decrease, the entropy of the surroundings must increase by a greater amount, thus the total entropy of the universe still increases.

A covalent bond is formed by the attraction between the nuclei and the shared pairs of valence electrons between nonmetal atoms, and an atom's ability to form covalent bonds depends on the number of available valence electrons.

In a covalent bond, two atoms are held together by the attraction between the nuclei of a molecule's atoms and pairs of electrons between the atoms. The number of covalent bonds that an atom can form depends on the number of valence electrons in the atom.

Atoms typically form a characteristic number of covalent bonds in compounds. The shared electrons are attracted to the nuclei of both atoms, contributing to the formation of a molecule consisting of two or more atoms. Notably, covalent bonds form only between atoms of nonmetals.

The shared electrons come from the outermost shell of each atom, also known as the valence shell. When the valence electrons are shared, they create a mutual affinity that holds the atoms together, resulting in a covalent bond depicted as C:H or C-H in the simplest case.

Answer:

38.4 atm.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(P₁V₁) = (P₂V₂).

P₁ = 3.0 atm, V₁ = 3200 L,

P₂ = ??? atm, ​V₂ = 250.0 L.

∴ P₂ = (P₁V₁)/(V₂) = (3.0 atm)(3200 L)/(250.0 L) = 38.4 atm.

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Answer:

3Mg + Fe₂O₃ → 3MgO + 2Fe.

Explanation:

3Mg + Fe₂O₃ → 3MgO + 2Fe.

That 3.0 mole of Mg react with 1.0 mole of Fe₂O₃ to produce 3.0 moles of MgO and 2.0 moles of Fe.

Mg (3), Fe (2), and O (3).