The Composition of Matter 33 



Carbon dioxide, a colorless gas, will not burn, and does not 

 sustain combustion. It is formed in burning, in decay and in 

 respiration. 



FACT AND THOUGHT QUESTIONS 



1. What is the molecular theory? 



2. What is the atomic theory? 



3. Define an element. Name several elements with which you are 

 familiar. 



4. Name the four most important elements. 



(a) Which of these four are tasteless and odorless? 



(b) Which support combustion? 



(c) Which are essential to life? 



5. Name several elements used in household articles. 



6. Complete orally the following statements: 



(a) If I drink a glass of water, I drink the elements . 



(b) A compound is . is an example of a compound. 



7. Define a mixture. 



8. Define a solution. 



9- Name several mixtures common in the preparation of food. 



10. Name some material you can add to salt and have a mixture. 



11. Suggest a material to add to water to form a solution. 



PROJECTS 



1. Burn a match. List, under a proper title, all the facts your senses tell 

 you in regard to it. 



2. Prepare a list of the various elements you have seen and can recognize. 

 Name several articles or substances in which each appears. 



3. Bring to class and be prepared to describe the main characteristics 

 of (a) an element ; (b) a compound ; (c) a solution. 



OUTDOOR OBSERVATION 



1. Explore a neighboring field or yard for compounds and mixtures. 

 Secure one sample of each group and label it properly. 



REFERENCES 



Introductory Physics Higgins 



Everyday Chemistry Vivian 



The Realities of Modern Science Mills 



