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Science 20110515

Science : What happens when matter changes

QuestionAnswer
What are the two types of matter changes? Physical and chemical change
What is physical changes? It is a change that no new substance is formed when changing
Give an example of physical change When salt dissolves and forms a salt solution. If we heat the solution, water evaporates leaving the salt we started with.
What is chemical change? It is a change which a new substance is formed when changing.
Give an example of chemical change When iron is exposed to the surrounding air slowly, it slowly changes into rust. However, it is very difficult to change rust back into iron ( although it can ). In this change, a new substance, rust is formed.
What are the differences between physical change and chemical change? -A physical change is a change in which no new substance is formed ; A chemical change is a change in which new substance is formed. -Physical change is often easy to change back ; chemical change are often difficult ha
What is the new substance called when chemical change? It is called a product
Created by: bhtan8888
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