If the only chemical you can find is labeled with the wrong concentration:
a- use the chemical anyway since most chemicals are safe.
b- inform the lab instructor and get instructions
c- you should recalculate the proper ratios for the entire experiment
d- you should dilute it to the proper concentration

inform the lab instructor and get instructions

Explanation:

If you come across a chemical in the laboratory which has been wrongly labelled, do not be quick to dilute it or take any further action. The laboratory instructor who may have prepared the reagent himself or has better knowledge about the reagent should be contacted immediately so that he/she can give you instructions about what to do with the wrongly labelled reagent.

what are the two models

explanation:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.