Yes, it is. The pencil is still composed of wood and graphite before and after the break, although the physical form is different, of course. If you wanted a comparison, burning the pencil would be a chemical change.
Evaporation because water absorbs the heat so the particles have more energy and can break away from bonds holding them together (turn to gas)
Answer:
legs of table +10N and -10N. fish tank +120.N - 70N. top of table +70N.
+120N. botom of fish tank -120N. and plz dont delit my anser
Explanation:
The first thing you need to know about this problem is that delta total = delta Hf products - delta Hf reactants.
Delta total = (4*NO + 6*H2O) - (5*O2 + 4*NH3)
Delta total = [(4*91.3 kJ/mol) + (6*-241.8 kJ/mol.) - (5*0 kJ/mol.) + (4*-45.9 kJ/mol.)
Products= 4*(365.2)+(-1450.8)=-1085.6 kJ
Reactants=4*(-45.9) + 5*(0)= -183.6 kJ
Delta Rxn= (-1085.6 kJ) - (-183.6 kJ) =-902.0 kJ
Explanation:
Appearance, melting point, density, solubility, polarity