Answer:
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Explanation:
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A triple beam balance is used to measure mass
Conservation of mass can be checked in an experiment . There are three steps to do it in a best way:
1. Weigh all the equipment and materials required in the experiment before the experiment.
2. Avoid spillage and evaporation during the experiment.
3. Weigh all the equipment and materials after the experiment.
If the mass is conserved then weight from step 1 is equal to weight from step 3.
Mercury naturally exists in Liquid state.
On Condensing it can exist in Solid state as well.
Hope it helps...
Regards;
Leukonov/Olegion.
Answer:
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Explanation:
Iodine-131
Iodine-131 is both a beta emitter and a gamma emitter.
![_{53}^{131}\text{I}\longrightarrow \, _{54}^{131}\text{Xe} +\, _{-1}^{0}\text{e} +\, _{0}^{0}\gamma](https://tex.z-dn.net/?f=_%7B53%7D%5E%7B131%7D%5Ctext%7BI%7D%5Clongrightarrow%20%5C%2C%20_%7B54%7D%5E%7B131%7D%5Ctext%7BXe%7D%20%2B%5C%2C%20_%7B-1%7D%5E%7B0%7D%5Ctext%7Be%7D%20%2B%5C%2C%20_%7B0%7D%5E%7B0%7D%5Cgamma)
About 90 % of the energy is β-radiation and 10 % is γ-radiation. Both forms are highly energetic.
The main danger is from ingestion. The iodine concentrates in thyroid gland, where the β-radiation destroys cells up to 2 mm from the tissues that absorbed it.
Both the β- and γ-radiation cause cell mutations that can later become cancerous. Small doses, such as those absorbed from the nuclear disasters in the Ukraine and Japan, can cause cancers years after the original iodine has disappeared.
Plutonium-239
Plutonium-239 is an alpha emitter.
![_{94}^{239}\text{U} \longrightarrow \, _{92}^{235}\text{Xe} + \, _{2}^{4}\text{He}](https://tex.z-dn.net/?f=_%7B94%7D%5E%7B239%7D%5Ctext%7BU%7D%20%5Clongrightarrow%20%5C%2C%20_%7B92%7D%5E%7B235%7D%5Ctext%7BXe%7D%20%2B%20%5C%2C%20_%7B2%7D%5E%7B4%7D%5Ctext%7BHe%7D)
Alpha particles cannot penetrate the skin, so external exposure isn't much of a health risk.
However, they are extremely dangerous when they are inhaled and get inside cells. They travel first to the blood or lymph system and later to the bone marrow and liver, where they cause up to 1000 times more chromosomal damage than beta or gamma rays.
It takes about 20 years for plutonium to be eliminated from the liver around 50 years for from the skeleton, so it has a long time to cause damage.