We can tell when a chemical reaction occurs by looking at the result. If the matter changes identity rather
than just form, then a (4)__ has occurred. When
this happens (5) are broken and formed. If a
substance's size, shape, or form changes then a
(6) has occurred. This happens when a change
in (7).
has happened, and the substance changes
between solid, liquid, and/or gas. This all falls under
the study of matter and how substances interact with
each other, or (8)

i think if it were me i whould divide 300 dide 15

step-by-step explanation:

no simpler subs form complex ones. synthesise = make

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m