Which physical properties can be used to identify an unknown substance?
choose all answers that are correct.
a.
length
b.
volume
c.
density
d.
boiling point

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.

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Anton because carbon dioxide and water are used with light energy to produce glucose sugar and oxygen gas.