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3 years ago

Which element is most important to scientists doing radiometric dating? nitrogen carbon -12 carbon - 14 hydrogen next?

Chemistry

2 answers:

Novosadov [1.4K]3 years ago

4 0

We know that we use carbon-14 for radiometric dating of any fossil or old substance containing carbon

. The choice of Carbon-14 for dating purpose is due to its radioactive nature

So after a certain time period the amount of C-14 decreases from a body after death and by measuring the amount of Carbon 14 remained in a body we can assess the age of that particular body

A living organism continuously exchange Carbon -14 from atmosphere and this stops after death.

zmey [24]3 years ago

4 0

Carbon-14.

<h3>Further explanation </h3>

Living things like animals and plants have a known proportion of carbon-14 in their tissues. Carbon-14 is one of the radioisotopes of carbon.
When they die, they stop taking carbon in, then the amount of carbon-14 decreases at a known rate.
The age of ancient organic materials can be obtained by measuring the amount of carbon-14 that remains. This activity is what we call radioactive dating.
Carbon-14 has a half-life of 5,700 years.

It can be concluded that the element of carbon-14 is most important to scientists doing radiometric dating.

<u>Uses of radioactivity </u>

Radiography. A picture can be obtained on film with the help of radioactivity emissions. This is known in medicine as a roentgen film. X-rays are used which are produced by electronic devices.
Sterilizing. Gamma rays can be used to kill bacteria, mold, and insects in food even after it has been packaged.
PET or Positron Emission Tomography is a technique that uses an isotope of carbon, especially carbon-11, as the radioactive tracer to measure the changes in blood flow within the brain.
Radioactive tracers. The most common tracer is technetium-99 and is very safe because it only emits gamma rays and doesn't cause much ionization. A small amount of iodine-123 can be used for medical checkings, like checking for a blocked kidney.
Radiotherapy as a treatment for cancerous and tumors. Tracers like cobalt-60, technetium-99, iodine-131, and phosphor-32 are used to detect, locate, and diagnose tumors and treat cancers.

And much more.

<h3>Learn more</h3>

The characteristics of electromagnetic waves brainly.com/question/727976
Find out the fraction of the space within the atom is occupied by the nucleus brainly.com/question/10818405
Carbon atoms can form four covalent bonds brainly.com/question/3064597

Keywords: element is most important, radiometric dating, nitrogen, carbon-11, carbon-14, hydrogen, treatment for cancerous, tumors, radiography, half-life, radiotherapy, the age, living things, animals and plants

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Five kilograms of liquid carbon tetrachloride undergo a mechanically reversible, isobaric change of state at 1 bar during which

Drupady [299]

Answer:

Explanation:

From the information given:

Mass of carbon tetrachloride = 5 kg

Pressure = 1 bar

The given density for carbon tetrachloride = 1590 kg/m³

The specific heat of carbon tetrachloride = 0.84 kJ/kg K

From the composition, the initial volume of carbon tetrachloride will be: $= \dfrac{5 \ kg }{1590 \ kg/m^3}$

= 0.0031 m³

Suppose $\beta$ is independent of temperature while pressure is constant;

Then:

The change in volume can be expressed as:

$\int ^{V_2}_{V_1} \dfrac{dV}{V} =\int ^{T_2}_{T_1} \beta dT$

$In ( \dfrac{V_2}{V_1}) = \beta (T_2-T_1)$

$V_2 = V_1 \times exp (\beta (T_2-T_1))$

$V_2 = 0.0031 \ m^3 \times exp (1.2 \times 10^{-3} \times 20)$

$V_2 = 0.003175 \ m^3$

However; the workdone = -PdV

$W = -1.01 \times 10^5 \ Pa \times ( 0.003175 m^3 - 0.0031 \ m^3)$

W = - 7.6 J

The heat energy Q = Δ h

$Q = mC_p(T_2-T_1)$

$Q = 5 kg \times 0.84 \ kJ/kg^0 C \times 20$

Q = 84 kJ

The internal energy is calculated by using the 1st law of thermodynamics; which can be expressed as;

ΔU = ΔQ + W

ΔU = 84 kJ + ( -7.6 × 10⁻³ kJ)

ΔU = 83.992 kJ

3 0

2 years ago

Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()zn

Bingel [31]

Based on the chemical equation, to balance the equation we use 2 as a coefficients of HCl on left hand side of reaction.

<h3>What is balanced equation?</h3>

Balanced chemical equations are those equation in which each entities are present in same amount on left side as well as on the right side of the chemical reaction.

Given chemical reaction is:

Zn + HCl → ZnCl₂ + H₂

Above reaction is not balanced equation as number of chlorine and hydrogen atoms are not same, so balanced equation will be:

Zn + 2HCl → ZnCl₂ + H₂

Hence we add 2 as a coefficient of HCl to balance the equation.

To know more about balance equation, visit the below link:
brainly.com/question/26694427

8 0

1 year ago

HELP PLEASE!!!!!

Mashutka [201]

Answer:

National fire protection Association

Explanation:

the nfpa is a global self funded nonprofit orgnazation establised in 1896 devoted to eliminating death injury protery loss and ecomomic loss due to fire and electrical hazards

4 0

2 years ago

Electromagnetic waves that are harmful to living things are

Westkost [7]

B. both high energy and low energy waves

5 0

2 years ago

Help! What did I do wrong??

iogann1982 [59]

The molecules of hydrogen gas that are formed is when 48.7 g of sodium are added to water is 6.375 x 10²³ molecules

<u><em>calculation</em></u>

2 Na +2H₂O → 2 NaOH +H₂

Step 1: find the moles of sodium (Na)

moles =mass÷ molar mass

from periodic table the molar mass of Na = 23 g/mol

moles= 48.7 g÷ 23 g/mol =2.117 moles

Step 2:use the mole ratio to determine the moles of H₂

from given equation Na:H₂ is 2:1

therefore the moles of H₂ = 2.117 moles x 1/2=1.059 moles

Step 3: find the molecules of H₂ using the Avogadro's law

According to Avogadro's law 1 mole = 6.02 x 10²³ molecules

1.059 moles = ? molecules

by cross multiplication

= [(1.059 moles x 6.02 x10²³ molecules) / 1 mole] =6.375 x 10²³ molecules

4 0

3 years ago