Level 16
Level 18
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reactant
reactivo
chemically linked
unido químicamente
ash
ceniza
to burn
quemar
rearranged
reorganizado
to take place
tener lugar
to involve
implicar
sign
indicio
odour
hedor
released
liberado
smoke
humo
fuel
combustible
rust
óxido
to break apart
hacerse pedazos
to speed up
acelerar
