N(Mg) : n(O)
1 : 1
the ratio is one to one
Answer:
It takes 6h to the radioactive source decrease its activity from 200 to 25
Explanation:
The equation that describes the readioactive decay is:
Ln [A] = -kt + Ln [A]₀
<em>Where [A] could be taken as activity of the source after time t, [A]₀ is initial activity and k is decay constant.</em>
<em />
Decay constant could be written as:
k = ln2 / Half-life
k = ln 2 / 2h
k = 0.3466h⁻¹
Replacing in decay equation:
Ln [25] = -0.3466h⁻¹t + Ln [200]
-2.0794 = -0.3466h⁻¹t
6h = t
It takes 6h to the radioactive source decrease its activity from 200 to 25
<u><em>Answer</em></u>
- Correct option is B. feel slippery.
<u><em>Explanation</em></u>
If solution has low pH (0-6) is acidic while with higher high pH (8-14) is basic.
<em>Properties of acid solution</em>
1. Sour taste
2. Turn blue litmus paper into red
3. gives off hydrogen gas when reacted with metal
<em>Properties of basic solution</em>
1. Bitter taste
2. Turn red litmus paper into blue
3. no reactions with metal
4. Feel slippery
Answer:-
(a) 3.5
(b) 3
Explanation:-
2KClO3 --> 2KCl + 3 O2
From the equation we see that 2 moles of KClO3 gives 2 moles of KCl.
So 3.5 moles of KClO3 will give 3 moles of KCl.
Again
3 moles of O2 are produced with 2 moles of KCl.
If 4.5 moles of O2 produced then
moles of KCl = 4.5 x 2/3
=3
Answer:
Explanation:
At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior. The kinetic theory assumes that gas particles occupy a negligible fraction of the total volume of the gas. It also assumes that the force of attraction between gas molecules is zero.
I hope I helped you! :)
