Active transport requires energy and passive does not use energy.
A physical property is any property that can be observed without putting the element through a Chemical Reaction.
Assuming that this is a multiple choice question:
Hardness is something you can feel.
Color is something you can see.
Melting point can simply be observed by applying heat.
Therefore, the answer must be “Chemical reactivity”, which conversely has the word “Chemical” in it.
1000 to the power 4 not so good at math but
Hydrogen ions
mark me brainlist
Answer:
I'd say about 8?
Explanation:
if you wanna make them huge make about 6