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Answer:
A nucleus is a positive charge
Explanation:
A nucleus is made up of protons and neutrons. Protons have a positive charge and neutrons have a neutral charge.
Answer:
37.15 h.
Explanation:
- The decay of radioactive elements obeys first-order kinetics.
- For first-order reaction: <em>kt = lna/(a-x).</em>
where, k is the rate constant of the reaction <em>(k = 2.4 x 10⁻² h⁻¹)</em>.
t is the time of the reaction <em>(t = ??? day)</em>.
a is the initial concentration of nuclides <em>(a = 100 %)</em>.
(a-x) is the remaining concentration of nuclides <em>(a - x = 100% - 59% = 41.0 %)</em>.
<em>∴ kt = lna/(a-x)</em>
(2.4 x 10⁻² h⁻¹)(t) = ln(100.0%)/(41.0%).
(2.4 x 10⁻² h⁻¹)(t) = 0.8916.
<em>∴ t </em>= (0.8916)/(2.4 x 10⁻² h⁻¹) = <em>37.15 h.</em>
Answer:
1.04868 Standard atmosphere
Compound sample: In a compound there remains bond between two or more atoms, which is produced by a chemical reaction. As for example:
. Thus water is a compound.
Compound homogeneous mixture: In a material which is produced more than one element but both remains in the same phase. There will be uniformity in the mixture. Like gas with gas, liquid with liquid etc. Example: Air which is mixture of oxygen, nitrogen, carbon di oxide where all the compounds are in gaseous form.
Compound Heterogeneous mixture: The mixture where the compound or elements by which the mixture is prepared are in different phase. Like chalk (CaC
in water (
(liquid), which is a heterogeneous mixture.