This is a relatively easy half-life problem.
Whenever a half-life has expired, one half of the radioactive isotope will no longer be present.
When 2 half-lives have occurred, then one quarter of the isotope remains.
Therefore, the strontium - 90 will be at a safe level in 54 years.
Answer:
ADD MORE POINTS THEN WE CAN TALK HUN
Explanation:
YW!!!!! ;D
Explanation:
NAME: <em>H</em><em>e</em><em>x</em><em>y</em><em>l</em><em>p</em><em>r</em><em>o</em><em>p</em><em>e</em><em>n</em><em>o</em><em>a</em><em>t</em><em>e</em>
Answer:
the coefficients in a chemical equation give the number of molecules (or atoms) involved in the reaction. In the example reaction, two molecules of hydrogen react with one molecule of oxygen and produce two molecules of water. Second: the coefficients give the number of moles of each substance involved in the reaction.
Explanation:
Energy must be added to change carbon powder into synthetic diamond because at ordinary temperature and pressure conditions, this reaction will not take place.
To form diamond, conditions of high pressure must be made available. Diamond is an allotrope of carbon that is very hard and difficult to break.
To form diamond synthetically, we must be able to replicate the natural conditions by which it forms.
Diamond forms under very high grade metamorphic pressure. This must also be the condition to form the synthetic variant.