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
kotegsom [21]
3 years ago
6

The half-life of radioactive substance is 2.5 minutes. what fraction of the origional radioactive remains after 10 mins

Chemistry
1 answer:
saul85 [17]3 years ago
3 0
The answer is 1/16.

Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1. (1/2)^{n} = x,
where:
<span>n - a number of half-lives
</span>x - a remained fraction of a sample

2. t_{1/2} = \frac{t}{n}
where:
<span>t_{1/2} - half-life
</span>t - <span>total time elapsed
</span><span>n - a number of half-lives
</span>
So, we know:
t = 10 min
<span>t_{1/2} = 2.5 min

We need:
n = ?
x = ?
</span>
We could first use the second equation to calculate n:
<span>If:
t_{1/2} = \frac{t}{n},
</span>Then: 
n = \frac{t}{ t_{1/2} }
⇒ n = \frac{10 min}{2.5 min}
⇒ n=4<span>
</span>
Now we can use the first equation to calculate the remained fraction of the sample.
<span>(1/2)^{n} = x
</span>⇒ x=(1/2)^4
<span>⇒x= \frac{1}{16}</span>
You might be interested in
This chemical equation represents a chemical reaction.
Strike441 [17]

Explanation:

products are Nacl + H20

5 0
2 years ago
What object does a scientist use to measure liters
Arturiano [62]
Liter measures liquid- so a measuring cup
4 0
3 years ago
Determine the number of liters in a 355 milliliter can of soda.<br> Ans: 0.355 L
Drupady [299]
0.355

A cubic inch is a unit of volume. It is the size of a cube that is 1 inch on a side. It is approximately 1.1 tablespoons, or about 16.4 cubic centimeters. A liter, or litre, is a unit of volume in the metric system.
...
8 0
3 years ago
PLEASE HELP IM REALLY STRESSED OUT AND I JUST NEED SOMEONE TO DO THIS FOR ME! IK ITS ALOT SORRY! In this task, you'll determine
Burka [1]

Answer:

The reaction is endothermic

Part A: Yes because there is an immediate reaction of bubbling vigorously.

Part B: It releases energy because when the compounds are added together they are immediately releasing it by bubbling and turning cold.

Part C: Yes because the liquids inside when combined give off coldness that makes the liquid temperature decrease to use this chemical reaction could definitely be used to keep something cold

Explanation:

7 0
3 years ago
What is the mass of 0.100 mole of neon? (Watch sf’s) 2.018 g 20.18 g 2.02 g 2 g
makkiz [27]

Answer:

The mass of 0.100 mole of neon is 2.018 grams.

Explanation:

As we know the formula to find mass:

                           Number of moles         =  Mass/ Molar mass

                                        0.100                = Mass/ 20.17

                                        0.100 x 20.17   = Mass

                                                        Mass=2.018 grams.

Hope it helps!

7 0
2 years ago
Other questions:
  • Which type of compound has a high melting point, conducts electricity in the molten phase
    6·1 answer
  • What is true about empathy?
    13·1 answer
  • If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCl solution, what is the concentration of the HCl?
    7·1 answer
  • When an atom loses electrons it becomes _____.
    6·2 answers
  • A farm is located on the edge of a river. The farmer has an insect problem and doubles the amount of pesticides used for several
    8·2 answers
  • You have a solution of 600 mg of caffeine dissolved in 100 mL of water. The partition coefficient for aqueous caffeine extracted
    12·2 answers
  • You are given two fatlike solid substances and determine that sample a has a higher melting point than sample
    11·1 answer
  • In the compound Al2O3, the ratio of aluminum to oxygen is?
    14·1 answer
  • Use your periodic table of elements. Take any element from the second column, except for beryllium and calcium, and answer the f
    10·2 answers
  • The polypropylene (repeat unit CH₃CHCH₂) in a plastic toy has a molar mass of 2.8x10⁵ g/mol and a repeat unit length of 0.252 pm
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!