Answer:
each element is designated by its <u>Chemical Symbol </u>which is usually from the first letters of the elements name
Explanation:
You have a raw egg you put it in a hot pan boom cooked egg most chemical changes are nonreversibal <span />
E=hc/λ =6.626×10^-34×3 ×10^8 / 3×10^7 × 10^-9 = 6.626×10 ^-24J.
Speed in km/hr = 15 x 18
------------
5
= 54 km/hr.
Hope this helps!