Answer: 6.1 mg
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.


b) sample remains after 1.4 days




The sample remains after 1.4 days is 6.1 mg
Answer:
I'm pretty sure that it's plate movement...
Explanation: i stuck at this Answer:Sometimes atoms share more than one pair of electrons, for example a double covalent bond can occur, as in the carbon dioxide molecule where carbon shares 2 pairs of electrons with each oxygen atom: O=C=O. (where = represents a double bond). Another kind of covalent bonding is called co-ordinate or dative covalent.
Answer:
The boundary would be a divergent boundary
Ionic compounds are formed when the transfer of electrons is a metal and non metal.<span />