Which laboratory activity involves a chemical change? leaving a copper penny in vinegar until it turns green

boiling salt water for several minutes until only solid salt remains

extracting iron filings from a sand mixture using a magnet

crushing a rock with a hammer to extract mineral deposits

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is