Physical &Chemical reaction的問題
2.Which of the following everyday activities are physical changes,and which are chemical changes?(這題是要說明哪些是化學變化哪些事物理變化的吧 我想...)
(a)salting ice on a driveway
(c)mixing sand with soil
(d)composting cut vegetation
(e)using a glue gun
3.Which of the following are examples of a physical change?
(a)change in physical state
(b)change in size or shape
(c)change in properties
(d)change in texture
(e)change in physical quantities
(f)change in substances
4.Which of the following are examples of a chemical change?
(c)dissolving of sugar
(d)evaporation of water
(f)digestion of food
5.Make a list of five physical changes and five chemical changes that you see in your daily life.
6.If you cut a piece of paper in two,do the properties of the paper change?
If you cut these two pieces of paper in half,do the properties change?
If you repeat this process indefinitely,would there come a time when the properties could change?Explain your thinking.