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If a certain radioactive substance has a half life of one year how many atoms of the substance remain after 5 years if there are initially 5000 such atoms?
Half life refers to the time required for the change (decay) of a radioactive nucleus to a lighter, possibly more stable, nucleus.
Starting with 5,000 radioactive atoms, at the end of first year, half would have decayed leaving 2,500. Following the same pattern, the end of the second year would see only 1,250. By the end of year 5, there would be just 156 radioactive atoms.
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For any pure substance the boiling point and melting point will always remain?
The melting point and the boiling point of a substance are physical characteristics for each substance and are unchanged at the same pressure.
The half-life of actinium 227 is 21.772 years After 50 years how much of a 1500 g sample will remain radioactive?
After 50 years, 1500 g of actinium-227 will have undergone approximately 2.3 half-lives (50 years / 21.772 years per half-life). This means that approximately 25% (50% decayed after 1 half-life, and 50% of the remaining amount decays after the second half-life) of the original sample will remain radioactive, so there will be around 375 g of actinium-227 remaining.
What stays the same when ice melts?
When ice melts, the chemical composition of the substance remains the same. Only the physical state changes from a solid to a liquid, while the molecules that make up the ice remain unchanged.
What happens when a physical change does not go to completion?
When a physical change does not go to completion, there may be a partial alteration in the physical properties of the substance involved. This could result in a temporary or incomplete transformation, where some characteristics may change while others remain unchanged. Incomplete physical changes often mean that the substance retains some of its original properties or structure.
Would a 5555 degree Celsius boiling point turn to a liquid in a negative 50 degree Celsius freezer?
Yes, When I first Asked This Question on 11/15/12 I Just Couldn't Figure It Out But Then I found Out The Answer of "suppose these substances were placed in the freezer set to -50`c. Which substance would become a liquid?" The answer was tungsten!
Best definition of half-life for a radioactive substance?
The half-life of a radioactive substance is the time it takes for half of the atoms in a sample to decay. It is a constant characteristic of each radioactive isotope. After one half-life, half of the original substance will remain, and the other half will have decayed into other elements.
What does a half-life decay graph illustrate and how does it provide insight into the rate of decay of a radioactive substance?
A half-life decay graph shows how the amount of a radioactive substance decreases over time. It helps us understand the rate of decay by demonstrating the time it takes for half of the substance to decay. The graph provides insight into the stability and decay process of the substance, allowing scientists to predict how much will remain at any given time.
After three half-lives what fraction of a radioactive sample will remain?
Approx 1/8 will remain.
Will radio isotopes injected into body remain in the body forever?
No, they will eventually find ways out of your body. These isotopes are injected for certain radiation treatments at the doctors office or hospital such as: xray, catscan, mri, etc. Those that don't leave the body eventually decay and become inert, just as any other radioactive substance does.
Will radio isotopes injected into the body remain in the body forever?
No, they will eventually find ways out of your body. These isotopes are injected for certain radiation treatments at the doctors office or hospital such as: xray, catscan, mri, etc. Those that don't leave the body eventually decay and become inert, just as any other radioactive substance does.
If the initial quantity is 5 grams how much remains after 600 years?
That depends what assumptions you make about what the 5 grams of matter is made of.
If the boiling point of a certain amount of a liquid is 150 degrees then what is the boiling point of twice that amount of the liquid?
The boiling point of twice the amount of liquid will remain 150 degrees. The boiling point of a substance is determined by the chemical properties of the substance itself, rather than the quantity of the substance.
Why does the temperature remain constant when it boils?
A substance has different phases, but it only boils at a certain temperature. If it is over that temperature it will evaporate or if it is under that temperature it won't boil.
A radioactive substance has has life of 5 days initial mass of 12kg how much the original isotope will remain after 10 days?
After 10 days, 1/2 of the original isotope will remain since its half-life is 5 days. This means 6kg of the original isotope will remain after 1 half-life, which remains the same after 10 days since another half-life has passed.
Do properties remain the same regardless of the amount of the substance?
Intensive properties remain the same with a change in the amount of a substance - for example: temperature and density Extensive properties do not remain the same with a change in the amount of a substance - for example: mass and volume
How much of a radioactive substance remains after 10 hours if its half life is 5 hours?
After 10 hours, 25% of the radioactive substance remains because each half-life reduces the amount by half. So, after the first 5 hours, 50% remains, and after the next 5 hours, half of that amount remains, which is 25%.
Is the following sentence grammatically correct -'Energy of a substance which always remain stationary'?
It is not a sentence. There is no main verb.
