The chemical equation needs to be balanced so that it follows the law of conservation of mass.
Iron filings can be attracted by the magnet whereas salt can not. So the mixture can be separated by a magnet
Reactivity of non-metals depend on their ability to gain electrons. So, smaller is the size of a non-metal more readily it will attract electrons because then nucleus will be more closer to valence shell. ... Hence, Br is the non-metal which will be more reactive than At.
Answer:
kinetic energy is energy possessed due to its motion while potential energy is energy possessed by a body by virtue of its position relative to others
the answer is option D "people emphasized obtaining knowledge through scientific experiments" (on plato)
