Answer:
The website is inaccurate.
Explanation:
Remember, a chemical change is characterized by many things, but most commonly:
- A change in color, temperature or state.
- An irreversible change
- One or more new substances are formed
Rusting (Iron oxide) is a redox reaction (Oxidation-Reduction Reaction) where iron molecules come in contact with water and oxygen molecules. The iron molecules lose electrons, becoming oxidized, while oxygen gains electrons, becoming reduced.
Is rust reversable? (No)
Did the colour of the iron on the surface change? (Yes)
Did a new substance form? (Yes, Read above).
Hope I helped! Have a good day!
Answer:
The correct answer is option b. "He passed cathode rays through a magnetic field and measured the deflection".
Explanation:
J. J. Thomson was a notorious scientist that did not only made the discovery of the electron, but he measure its charge to mass ratio. In order to determine this property, Thomson passed cathode rays through a magnetic field and measured the deflection. Cathode rays are actually composed of particles, which are now known as electrons, and its charge to mass ratio is about 10^8 coulomb per gram.
