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3 years ago

Which radioactive isotope is most useful for determining the age of mastodont bones found in late Pleistocene sediments?

Chemistry

2 answers:

denis-greek [22]3 years ago

8 0

Answer: carbon-14

Explanation: the radioactive isotope suitable for dating Pleistocene sediments is Carbon-14

andrezito [222]3 years ago

8 0

Answer:

Carbon-14

Explanation:

Carbon dating is also known as radiocarbon dating. Carbon dating is a technique used in the determination of of age(s) of an object. It has been proved that carbon dating is efficient for dating archaeological specimens and fossils. Carbon dating method was developed by Willard Libby(A physicist).

Carbon-14 is an isotope of of carbon. Carbon-14 is radioactive. Carbon-14 is very important in many aspect both medically( to detect ulcer causing bacteria) and in the determination of age of an object. It is also used in radio labelling.

All living things maintain certain amount of carbon-14 while still alive, but when living things die, the amount of carbon-14 decreases exponentially. Carbon-14 is produced by cosmic radiation in the atmosphere.

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A mixture of ethyl acetate vapour and air has a relative saturation of 50% at 303 K and a total pressure of 100 kPa. If the vapo

AURORKA [14]

Answer : The correct option is, (b) 0.087

Explanation :

The formula used for relative saturation is:

$\text{Relative saturation}=\frac{P_A}{P_A^o}$

where,

$P_A$ = partial pressure of ethyl acetate

$P_A^o$ = vapor pressure of ethyl acetate

Given:

Relative saturation = 50 % = 0.5

Vapor pressure of ethyl acetate = 16 kPa

Now put all the given values in the above formula, we get:

$0.5=\frac{P_A}{16kPa}$

$P_A=8kPa$

Now we have to calculate the molar saturation.

The formula used for molar saturation is:

$\text{Molar saturation}=\frac{P_{vapor}}{P_{\text{vapor free}}}$

and,

P(vapor free) = Total pressure - Vapor pressure

P(vapor) = $P_A$ = 8 kPa

So,

P(vapor free) = 100 kPa - 8 kPa = 92 kPa

The molar saturation will be:

$\text{Molar saturation}=\frac{P_{vapor}}{P_{\text{vapor free}}}$

$\text{Molar saturation}=\frac{8kPa}{92kPa}=0.087$

Therefore, the molar saturation is 0.087

5 0

3 years ago

HELP ASAP!!!!!!!

Mrrafil [7]

"One has more oxygen atoms than the other" best distinguishes carbon dioxide from carbon monoxide

Explanation:

In both carbon monoxide and carbon dioxide, there is the presence of carbon and oxygen. However,they vary depending on the number of oxygen atoms.In carbon monoxide, there is the presence of one only carbon and oxygen atom. Thus carbon monoxide is chemically represented as CO. Only about 0.2%ppm of carbon monoxide present in air. carbon monoxide is toxic and causes death in human when not consumed is correct proportion.

Whereas in carbon dioxide, only one carbon atom,and two oxygen atom and hence chemically represented as co2.

3 0

3 years ago

Competition is rivalry between individuals for a particular resource.

djyliett [7]

Answer:

True

Explanation:

Competition is the act of competing with one another for a particular resource. An example is two animals quarrelling over a food or two people quarreling over who lost their money. Competing is a type of rivalry in which two people compete for one resource. The answer for this question is True.

5 0

3 years ago

Read 2 more answers

Radiometric dating is used to determine

PolarNik [594]

Answer:

used to date rocks and other objects based on the known decay rate of radioactive isotopes.

Explanation:

Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.

4 0

3 years ago

If you found carbon 13 atom, you would know that

bearhunter [10]

The Options are as follow,

a. it has 13 protons c. it has 13 neutrons

b. it has 13 electrons d. it has 7 neutrons

Answer:

Option-d is the correct answer.

Explanation:

As we know that C-13 has a atomic mass of 13. Also, atomic mass is given as,

Atomic Mass = # of Protons + # of Neutrons --- (1)

Since;

Atomic Mass = 13

And,

# of protons = 6 (as number of protons = atomic number)

Putting values in equation 1,

13 = 6 - # of Neutrons

Solving for Number of Neutrons,

# of Neutrons = 13 - 6

# of Neutrons = 7

3 0

3 years ago