HOMEWORK : Dangerous chemical subtance and their symbol in the laboratory

You have already learned various kinds of dangerous chemical, so those materials must be used carefully. When we work in the laboratory, we will deal with dangerous chemical, so we must be careful. On the package of chemical, usually there are symbol which show the danger level.

QUESTION
1. Mention many kinds of dangerous chemical!
2. Explain the good condition for storage of dangerous chemical each material chemical!
3. What must be do to prevent us from intoxication in the lab?
4. Mention the examples of poisonous materials!
5. What is the symbol to show a flammable chemical?

GOOD LUCK