How long will it take for the sarcophagus to be completely buried? STEP 1 First, convert meters to millimeters: 3 m = mm
STEP 2 Then, set up a proportion. Use the variable n to represent the unknown:
2 mm/1 yr =
_mm/
STEP 3 Solve the proportion

Help pls I’ll mark brain

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

a polar bond is formed when electrons are shared unevenly between atoms

pv=nrt

explanation: