1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Scrat [10]
3 years ago
13

A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

Chemistry
1 answer:
attashe74 [19]3 years ago
6 0

Answer: The amount of carbon-14 left after 10 years is 25 g

Explanation:

Formula used :

a=\frac{a_o}{2^n}

where,

a = amount of reactant left after n-half lives = ?

a_o = Initial amount of the reactant = 100 g

n = number of half lives =\frac{\text {given time}}{\text {half life}}=\frac{10}{5}=2

Putting values in above equation, we get:

a=\frac{100g}{2^2}

a=\frac{100g}{4}=25g

Therefore, the amount of carbon-14 left after 10 years is 25 g

You might be interested in
a student wants to remove the salt from a mixture of sand and salt in order to get only person he adds water to the mixture why
pickupchik [31]
You would add water to the mixture to dissolve the salt. When the salt is dissolved, you have your sand alone.
6 0
3 years ago
Read 2 more answers
I need help with this
lys-0071 [83]

Answer:

Fossils are the some traces or portions of the animals or plants, buried and preserved from past in rocks, sediments or ice.

Explanation:

                                  Correct match  is as follows-

  1. Mold and cast fossils-  An organism is buried in sediment after it dies.The hard part of organism leave behind a empty space imprinted in the rock. Later sediments and minerals fill the space and harden to make the original copy of the organisms.
  2. Carbon film fossils- An organism buried in sediments gets squeezed and heated inside the earth , leaving behind a thin carbon outline of the organism on a rock.
  3. Amber fossil-  An organism covered in tree resin or tree sap , which then hardens with the body of the organisms preserved inside.
  4. Ice fossil- An organism dies in a cold place on earth , its body becomes frozen and covered in layers of ice . The hard and soft part of the body may be preserved.

3 0
3 years ago
How did the discovery of isotopes help to lead to a revised model of atomic structure?
Arte-miy333 [17]
Dalton postulated that atoms of the same elements had the same mass while atoms of different elements had different masses. 

The discovery of isotopes revealed that atoms of the same element did not necessarily have same masses, they could have different masses.

Therefore, the modern periodic table that we use nowadays contains the average atomic mass of all the isotopes found for a given element.
8 0
4 years ago
A reaction rate increases by a factor of 655 in the presence of a catalyst at 37°C. The activation energy of the original pathwa
irinina [24]

For a reaction rate that increases by a factor of 655 in the presence of a catalyst at 37°C, the activation energy of the new pathway  is mathematically given as

Ea2=89.28JKoule/mol

<h3>What is the activation energy of the new pathway, all other factors being equal?</h3>

Generally, the equation for the rate constant  is mathematically given as

K=Ae^{Ea1/Rt}

Therefore

\frac{1}{655}=\frac{1}{8.31*3.10}(Ea2-105000)

Ea2=89286.083Joule/mol

In conclusion, the activation energy

Ea2=89.28JKoule/mol

Read more about Energy

brainly.com/question/13439286

5 0
3 years ago
The conjugation of the trans/cis product is likely diminished due to steric interactions between the cis-phenyl and the nearby v
max2010maxim [7]

Answer:

The trans/trans stereoisomer.

Explanation:

So, we are going to have two stereoisomers or arrangements for this chemical compound, that is the Cis/trans, the trans/trans.

For a compound to be seen with UV, the main or primary condition is conjugation or how conjugated the chemical specie or compound is.

Thus, the more the conjugation, the more or the higher the wavelength or lands value.

=> The Trans/trans stereoisomer will have the highest lamda value or wavelength because the energy gap in its π - π* Transitioning deceases due to the STERIC interactions, and the more the decrease in the energy gap, the more or the higher the lamda value or wavelength.

8 0
3 years ago
Other questions:
  • In general, for a gas at a constant volume, _____.
    14·1 answer
  • List 2 of the important properties of gases.
    14·2 answers
  • Uranium-238 has a half-life of 4.5 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is th
    12·2 answers
  • Light travels at a speed of 3.00 × 1010 cm/sec. What is the speed of light in kilometers/hour?
    7·1 answer
  • Please help!!!
    9·2 answers
  • How can you contribute at your own level to save the environment? Plz say the anwer
    12·1 answer
  • Calculate the number of kilojoules of energy required to convert 50.0 grams of solid DMSO initially at a temperature of 19.0°C t
    10·1 answer
  • I have 2 questions....but it's multiple choice for 1 of them.
    10·2 answers
  • Water can act as both an acid and a base in an ionization reaction to form (H) and OH ions.
    9·2 answers
  • Digits in a numerical value that are not placeholders
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!