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
Anastasy [175]
3 years ago
10

In 36 hours the amount of radioactive substance has reduced from 80 mg to 10 mg. What is the half-life of this isotope?

Chemistry
1 answer:
rusak2 [61]3 years ago
6 0
Half-life refers to the time taken for half of the atoms in a radioactive substance to decay. Therefore in 1 half-life the 80 mg of substance will reduce to 40 mg. In another half-life it will reduce from 40 mg to 20 mg, then in a third half-life from 20 mg to 10 mg. Therefore the half-life is equal to the total time taken to decay from 80 mg to 10 mg divided by 3:
t(1/2) = 36 hours / 3 = 12 hours.
You might be interested in
Plz Help I have One more time To retake and I can't fail it..​
navik [9.2K]

Answer:

A

Explanation:

I think the answer would be A

4 0
3 years ago
A chemist mixes 71.1 g of carbon tetrachloride with 65.4 g of isopropenylbenzene and 4.02 g of 2-ethyltoluene. Calculate the per
-Dominant- [34]

Answer:

%  Carbon tetrachloride = 50.6 %

% isopropenylbenzene = 46.5 %

% 2-ethyltoluene = 2.9%

Explanation:

Step 1: Data given

A mixture contains:

71.1 grams of Carbon tetrachloride (CCl4)

65.4 grams of isopropenylbenzene (C9H10)

4.02 grams of 2-ethyltoluene (C9H12)

Step 2: Calculate total mass

Total mass = mass CCl4 + mass C9H10 + mass C9H12

Totam mass = 71.1g + 65.4g + 4.02g

Total mass = 140.52 grams

Step 3: Calculate % of each component:

% component = (mass component/ total mass) *100%

%  Carbon tetrachloride = (71.1 / 140.52) *100 %

%  Carbon tetrachloride = 50.6 %

% isopropenylbenzene = (65.4 / 140.52) *100%

% isopropenylbenzene = 46.5 %

% 2-ethyltoluene = (4.02/140.52) *100%

% 2-ethyltoluene = 2.9%

50.6% + 46.5% + 2.9% = 100%

5 0
3 years ago
Read 2 more answers
Through photosynthesis, plants use the energy in sunlight to convert water and
Shkiper50 [21]

Answer:

chemical change occured

3 0
3 years ago
What is the formula for an ionic compound that forms out of Sr and Br?
lesantik [10]

Answer: St Br2

Explanation: Br has only one valence electrons and Sr has 2 valence electrons this is why we need 2 atoms of Br to for an ionic compound with 1 atom of Sr.

8 0
3 years ago
HURRY PLEASE
Allushta [10]
C) coal !
Have a nice day!\
 :D
4 0
3 years ago
Other questions:
  • Match the humidities with their description.
    14·1 answer
  • Calculate the amount of energy when water at 72 degrees c freezes completely at 0 degrees c
    13·1 answer
  • What cannot be changed by turning 100 grams of ice into water?
    11·1 answer
  • Does an electric iron may have a lower wattage than a LED lightbulb
    7·1 answer
  • Explain why the Amazon River does not create deltas?
    9·1 answer
  • Why are masks important?
    9·2 answers
  • I have a homework and I need help please.​
    15·1 answer
  • What is density?
    8·2 answers
  • Do protons and neutrons attract?
    13·1 answer
  • Cocaine (C₁₇H₂₁O₄N) is a natural substance found in coca leaves, which have been used for centuries as a local anesthetic and st
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!