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
timofeeve [1]
3 years ago
7

what is the half life isotope if after 21 days you have 31.25 g remaining from a 250.0 g starting sample size?

Chemistry
1 answer:
alexgriva [62]3 years ago
3 0

250 --> 125 --> 62.5 --> 31.25


each arrow equals one half life, so 3 half lives


14 days/ 3 half lives =


4.67 days = half life

You might be interested in
Which of the following is a property of carbon atoms?
marusya05 [52]

Answer:

B. They can for covalent bonds with other atoms.

Explanation:

Carbon = King of the elements on the periodic table

For its proclivity to form stable covalent bonds with multivalent atoms.

5 0
3 years ago
Read 2 more answers
A 250ml glass of orange juice contains 22 grams of sugar. how much sugar is in a 2 liter (2.500ml) bottle of orange juice?
Maslowich

220 grams of sugar would be in 2 liters of orange juice

5 0
3 years ago
Discuss how the following factors determine the rate of electron transfer in biological systems:
Cloud [144]

Answer:check explanation

Explanation:

(a). HOW THE DISTANCE BETWEEN ELECTRON DONOR AND ACCEPTOR AFFECTS THE RATE OF ELECTRON TRANSFER IN BIOLOGICAL SYSTEM:

Distance between the acceptor and the donor can affect in two ways; short distance and long distance effect.

Short distance causes

electronic orbitals of donor and acceptor directly overlap whereas in LONG DISTANCE reactions this coupling is indirect because of

sequential overlaps of atomic orbitals of the donor, the intervening medium, and the orbitals of the acceptor.

(b). HOW REORGANIZATION ENERGY OF REDOX ACTIVE SPECIE SURROUNDING MEDIUM AFFECTS:

the reorganized energy does not depend on the pre-existing intra molecule electric field. The charge transferred inside the molecule interacts with its aqueous surroundings.

Reorganized energy can be calculated using Poisson-Boltzmann equation.

3 0
3 years ago
Which of the following is a true
Katarina [22]

❤️Hello!❤️ The answer is A. Energy can change from one form to another. Hope this helps! ↪️ Autumn ↩️

5 0
3 years ago
An example of a physical property of an element is the element's ability to
FromTheMoon [43]

Answer:

dissolve

Explanation:

When it dissolves , no chemicals are formed and it is considered as a physical property.

4 0
2 years ago
Read 2 more answers
Other questions:
  • What man-made carbohydrate is banned in Canada, China, and the European Union, but is legal in the United States?
    14·1 answer
  • How was hubble important to our understanding of galaxies
    8·1 answer
  • Dalton’s atomic theory included which idea?
    14·1 answer
  • What is the similarity between simple diffusion and facilitated diffusion?
    5·2 answers
  • If the same amount of energy in the form of heat is added to 8.9 g samples of each of the metals below, which metal will undergo
    13·1 answer
  • old blooded animals modulate the fatty acid composition of their membranes as a function of temperature in order to A) ensure co
    9·1 answer
  • The temperature of evaporation is much higher for water than for alcohol. Without knowing more about the chemistry of alcohol, w
    12·1 answer
  • Use the bond energies provided to estimate ΔH°rxn for the reaction below. CH3OH(l) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH°rxn = ? Bond
    12·2 answers
  • Substances have a fixed arrangement of atoms. true or false (NO LINKS PLEASE)
    5·1 answer
  • Moles to mass<br> HELP PLEASE <br> 15 pts
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!