Lesson 2

Front

to happen at the same time

Back

coincide

Front

to reduce in size by pushing or squeezing together

Back

compress

Front

a change that involves a chemical transformation

Back

reaction

Front

to watch and keep track of what is happening

Back

monitor

Front

the act of bursting into flames and burning

Back

combustion

Front

a strong tie or unifying force or binding element

Back

bond

Front

to combine or come together to form a whole

Back

compound

Front

to be made up of

Back

comprise

Front

shining or glowing

Back

luminous

Front

when all circumstances are taken into account

Back

overall