I think it is "Known".
Radioactive decay is measured using a formula where the half-life <span>of an isotope is the time it takes for the original nuclei to decay half of its original amount.</span>
What this is??????????????????
1. Pipette, measuring cylinder
Answer:

Explanation:
Hello!
In this case, since the decomposition of potassium chlorate is:

We can see a 2:3 mole ratio between potassium chlorate and oxygen (molar mass 32.0 g/mol), thus, via stoichiometry, we compute the mass of oxygen that are produced by the decomposition of 2.50 moles of this reactant:

Best regards!
A proton contains 2 up quark 1 down quark and gluons which the 3 quarks exchange. Now since there is only 1 option I would choose gluon. But it's up to you.