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changes in science

How to do a speech

How can you identify a physical change? You can identify a physical change if you can still identify the substance. If it retains its original identity, it is a physical change.
Physical change or chemical? #1 Butter melting in a pan is Physical
Physical change or chemical? #2 Salt dissolves in water Physical
Physical change or chemical? #3 Paper is shredded is physical
Physical change or chemical? Grass cut Physical
Physical change or chemical? A candle is burned is chemical
Physical change or chemical? Fireworks explode is chemical
Physical change or chemical? An apple turns brown is chemical
In the equation Na + O2 → Na2O, what is/are the product(s)? The compound Na2O is the only product in the reaction.
Why do nuclear changes require more energy than chemical changes? To change the nucleus, you must overcome more attractive forces than in a chemical change. Nuclear changes affect the protons in the nucleus; chemical changes affect the electrons surrounding the nucleus.
Created by: Kanekixuta