Answer:
Here is the meaning of covalent bond: covalent bond: a chemical bond in which two atoms share some of their valence electrons which creates a force that holds the atoms together
Hope this helps
Sky
Answer:
Option 4 is correct (72 seconds)
Explanation:
Option 4 is correct (72 seconds)
The formula we are going to use is:
Where:
A is the final concentration
A_o is the initial concentration
k is the constant
t is the time
Half-Life=0.693/k
Half-life in our case=24 seconds
k=0.693/24
k=0.028875 s^-1
Since the concentration is decreased by 87.5 % which means only 12.5%(100-87.5%) is left.
The ratio will become 0.125
t≅ 72 seconds
<span> A cubic centimeter of quart olivine and gold weigh 2.5, 3.0, and 19.8 grams resperctively. </span>
Moles= mass divided by Molecular mass
Moles= 251.4 divided by 84
Moles=2.99
Rounded up is 3