Answer:
Increasing the concentration of a substance will increase the rate of reaction because in a conc substance the particles are more clustered together and this causes more effective collisions thus increasing the rate of reaction and when the substance isn't concentrated the particles aren't really close and this reduces the rate of reaction because alot of collisions can't be made compared to that of the concentrated substance
Answer : The correct option is, (a) lose electrons and form a positive ion
Explanation :
Metals : These are the elements that easily loose electrons and forms cations.
They require less energy to loose electrons because electrons are loosely bound to the nucleus.
Non-metals : These are the elements that easily gain electrons to form an anion.
They require more energy to loose electrons because the electrons are tightly bound to the nucleus.
As per question, when a metal reacts with a nonmetal, the metal will lose electrons and form a positive ion and non-metal gain electrons and form a negative ion.
Hence, the correct option is, (a)
a. k=0.256/day
b.sample of Au-198 remains after seven days : 1.67 g
<h3>Further explanation</h3>
1. A half-life of 2.7 days⇒t1/2=2.7 days
The half-life can be expressed in a decay constant( λ)
2. We can use formula : (integrated rate law) :
![\tt ln[A]=-kt+ln[Ao]\\\\ln(\dfrac{Ao}{A})=kt](https://tex.z-dn.net/?f=%5Ctt%20ln%5BA%5D%3D-kt%2Bln%5BAo%5D%5C%5C%5C%5Cln%28%5Cdfrac%7BAo%7D%7BA%7D%29%3Dkt)
Ao=10 g
t=7 days
k=0.256/day
