Answer:
its where a whale has died and the carcass of the whale sinks to the depth of the oceanic floor.
:) hope that helps
Explanation:
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Answer:Ba
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Explanation:
option A:
is an anion and
is also an anion.So,there is no reaction.
option B:
reacts with
to form
.
Since
is a first group element,all its salts are soluble in water.
Hence no precipitate is formed.
option C:
reacts with
to form
.
Since
is a first group element,all its salts are soluble in water.
Hence no precipitate is formed.
option D:
reacts with
to form
.
Solubility of sulphates of second group elements decrease down the group.
So,
is a precipitate.
Answer:
After 3 half lives 10 g of radio active material left.
Explanation:
Given data:
Total amount of radio active material = 80 g
Amount left after 3 half lives = ?
Solution:
At time zero = 80 g
At first half life = 80 g/2 = 40 g
At 2nd half life = 40 g/2 = 20 g
At 3rd half life = 20 g/2 = 10 g
Thus, after 3 half lives 10 g of radio active material left.
The periodic table so she can see the number of valence electrons to put in her calculations