Physical & Chemical Properties and Changes
By Deborah and Ania
Physical properties- could be appearance,color, texture, smell, melting point, boiling point, density, solubility, polarity, and a lot of other things you could see, feel or touch. Physical changes- when an object or substance changes but the chemical composition of it does not. (ex:ice melting, ripped paper, cutting wood, etc) Chemical properties- a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed
( Dictionary.com. Dictionary.com. Web. 12 June 2015.) Chemical changes- A change in the chemical property or composition and one or more new substances are created through a chemical reaction (ex:burning wood, frying an egg,etc) |
Why do I like this topic?Why do I like this topic?
I like this topic because it was a really easy topic to learn. I really understood everything about physical & chemical properties/changes. I learned that a physical change in a substance doesn't change what the substance is. In a chemical change there is a chemical reaction a new substance is formed and energy is either given off or absorbed. for example in physical change a ripped piece a paper is still paper the substance of it never changed its just in smaller pieces. in chemical changes like a rusting bike or car door the whole substance changed the car door/bike went from shiny and smooth to rough and sandy like. But mostly I liked physical properties/changes because I never knew something as simple as ripping a piece of paper or a piece of ice melting could be such a big part of science like really it has a whole section. I like chemical properties/changes but not as much as physical because its more detailed and chemical like. its still pretty cool though I mean I just thought my bike rusting was my bike rusting. I didn't know it had all that science behind it. |