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
Ivahew [28]
3 years ago
11

You have 400 kg of a radioactive substance with a short half-life of 1000 years. how much will be left after these times?

Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
8 0
Half-life of a radioactive substance is the time required to reduce the amount of substance to half of its initial amount. 

In present case, half-life is material is given as 1000 years and initial amount of material is given as 400 kg
 
Answer 1) Since, half-life of radio-active substance is 1000 years, therefore after 1st half life, amount of the material will be left to half the initial amount. Hence, amount of substance left after 1000 years = 400/2 = 200 kg.

Answer 2) For 2000 years, radioactive material has crossed 2 times the half life. Therefore ,  amount of the material will be left to 1/4 the initial amount. Hence, amount of substance left after 2000 years = 400/4 = 100 kg.

Answer 3) 
 For 4000 years, radioactive material has crossed 4 times the half life. Therefore , amount of the material will be left to 1/16 the initial amount. Hence, amount of substance left after 4000 years = 400/16 = 25 kg.
You might be interested in
Why is it logical to assume that they hydrogen ion concentration in an aqueous solution of a strong monoproctic acid equals the
natka813 [3]
It is logical to assume that they hydrogen ion concentration in an aqueous solution of a strong monoproctic acid equals the molarity of the acid because ions which are charged,for example ammonium ion (NH4+), which can be derived by the addition of a proton to a molecular base.
3 0
3 years ago
PLEASE HURRY !! WILL GIVE BRAINLIEST
Montano1993 [528]
<span> </span><span>The results of new evidence can lead to changes in scientific knowledge.</span>
7 0
3 years ago
Read 2 more answers
When each of the following pairs of aqueous solutions is mixed, does a precipitation reaction occur? If so, write balanced molec
Aleks04 [339]

Yes, a precipitation process does take place here. BaCO₃ and KOH are the byproducts of this double displacement reaction, and since BaCO₃ is soluble in solution, it precipitates as a solid.

Molecular: Ba(NO₃)₂(aq) + K₂CO₃(aq) → 2K⁺(aq) + 2NO₃¯(aq) + BaCO₃(s) ⬇︎

The complete ionic reaction can be written as follows:

Ba²⁺(aq) + 2NO₃¯(aq) + 2K⁺(aq) + CO₃²¯(aq) → 2K⁺(aq) + 2NO₃¯(aq) + BaCO₃(s) ⬇︎

All the ions in solution have been written out. Now, on to the net ionic equation:

Ba²⁺(aq) + CO₃²¯(aq) → BaCO₃(s) ⬇︎

<h3>what is precipitation?</h3>

Any liquid or frozen water that condenses in the atmosphere and falls to the ground is known as precipitation. Snow, sleet, and rain are just a few of the variations. One of the three main processes that make up the global water cycle is precipitation, along with evaporation and condensation.

Water vapor in the clouds condenses into increasing-sized droplets of water, forming precipitation. Droplets fall to the Earth when they are sufficiently heavy. The water droplets may freeze to produce ice if a cloud is colder, as it would be at higher elevations. Depending on the temperature within the cloud and at the Earth's surface, these ice crystals eventually discharge to the Earth as snow, hail, or rain.

To learn more about precipitation visit:

brainly.com/question/18109776

#SPJ4

6 0
1 year ago
2. Would you measure a pencil in meters? A hallway in millimeters? Discuss
Eduardwww [97]

Answer:

Measuring a pencil in meters would be very difficult, as a single meter is much longer than one pencil. Also, measuring a hallway in millimeters would be very difficult considering how small millimeters are in comparison to a hallway. However, if you switch these two then they would work very well.

5 0
3 years ago
Select which of the following are used to determine the age of the Earth. Select 3.
saveliy_v [14]

Meteorites discovered on earth

7 0
2 years ago
Other questions:
  • When the elements in group 1 are considered in order from top to bottom, each successive element at standard pressure has
    11·2 answers
  • Why is water an effective solvent for ionic compound
    10·1 answer
  • In a test of an automobile engine 1.00 L of octane (702 g) is burned, but only 1.84 kg of carbon dioxide is produced. What is th
    12·1 answer
  • Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction?
    6·1 answer
  • Two 2 1/2 inch plastic strips and two 5 1/3 inch plastic stripa are used to form arectengale what is the perimter of the rectang
    14·1 answer
  • Suppose 2.19g of barium acetate is dissolved of 15oml barium of a 0.10M acetate is dissolved in of a aqueous solution of sodium
    13·1 answer
  • If there are 3 moles of hydrogen, 6 moles of oxygen, and 9 moles of helium in a 10 L vessel at 27°C, the total pressure of the g
    10·1 answer
  • How many grams of water would there be in 100.0g of hydrate? How many moles?
    6·2 answers
  • Which of the following statements is FALSE?A. For a given gas, the higher the temperature, the faster it will effuse.B. Particle
    11·1 answer
  • I don’t know this question please help
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!