Answer:
<em>b</em>
<em>an increase in non-biodegradable wastes</em>
Explanation:
Radioactive elements obey 1st order kinetics,
For 1st order reaction, relation between rate constant (k) and half life [t(1/2)] is,
k =

Also, for 1st order reaction, we have
t =
Given that: <span>the bones from a mastodon had lost 78.5% of their C14,
</span>∴ initial conc. of C14 = 100%, conc. of C14 left after time 't' = 21.5%
∴t =

= 1.2758 X 10^4 hours
Answer:
Real gas behaves like ideal gas at high temperature and low pressure.
Answer:
NaNH₂₀
Explanation:
0.5 mol Na, 0.5 mol N, and 10 mol H
To obtain the empirical formulae, we find the mole ratio between the elements and this is done by dividing all through by the smallest mol (0.5)
Na = 0.5 / 0.5 = 1
N = 0.5 / 0.5 = 1
H = 10 / 0.5 = 20
The mole ratio is used to write the empirical formulae. It is given as;
NaNH₂₀
Answer: -
Bond dissociation energy is the energy required to dissociate two atoms with covalent bonds.
This energy must be supplied during the course of a reaction.
Interesting to note that not all the bonds need to be broken during a chemical reaction, only the ones involved in the reaction.