Chemical properties are characteristics that change a substance. For example, when a bike comes in contact of water or oxygen it turns into rust which is Fe203. So it came from Iron and changed chemically to rust.
Physical is different because it doesn't change its substance. Example, melting an Ice cube is a physically change because an ice cube is just frozen water and when melted, its still water just not frozen.
<span>Permian-Triassic was one of the biggest mass extinction on Earth.</span>
S orbit can hold 2 electrons
Answer:
Explanation:
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In this case, since the first law of thermodynamics allows us to understand how the energy behaves when heat and work are involved during a process, we can mathematically define it as:
Whereas Q is the heat added to the system, W the work done by the system and ΔU the change in the internal energy, we can notice that since 97.0 J of work are done on the system it would be negative and the given off heat is also heat due to the used convention; therefore the change in its internal energy turns out:
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Answer:
- Chlorine
- Bromine
- Iodine
Explanation:
All three of these elements fall in group 7 of the periodic table and are called Halogens. Chlorine is the most reactive of these elements because it comes before the other two in the table then followed by Bromine and then Iodine.
Reactivity decreases in the group 7 elements as one moves to the latter elements due to the increase in shells surrounding the nucleus.
This is because reactivity happens as the protons in the nucleus attract electrons but when more shells are piled on, the strength of this attraction decreases as the distance increases such that they will not be as reactive anymore.