360 Common Science 



Application 82. A woman scorched the oatmeal she was 

 cooking for breakfast. When she wanted to wash the pan, 

 she found that the blackened cereal stuck fast to the bottom. 

 Which of the following things would have served best to 

 loosen the burned oatmeal from the pan : lye and hot water, 

 ammonia, vinegar, salt water, lemon juice? 



Inference Exercise 



Explain the following : 



521. After clothes have been washed with washing soda or strong 



soap, they should be thoroughly rinsed. Otherwise they 

 will be badly eaten as they dry. 



522. Carbon will burn; oxygen will support combustion; yet 



carbon dioxid (CO 2 ), which is made of both these elements, 

 will neither burn nor support combustion. 



523. You can clean silver by putting it in hot soda solution in con- 



tact with aluminum. 



524. When you stub your toe while walking, you tend to fall for- 



ward. 



525. Electric lamps glow when you turn on the switch. 



526. If you use much ammonia in washing clothes or cleaning, 



your hands become harsh and dry. 



527. If a person swallows lye or caustic soda, he should im- 



mediately drink as much vegetable oil or animal oil as 

 possible. 



528. Water is made of hydrogen and oxygen; air is made of 



nitrogen and oxygen; yet while things will not burn in 

 water, they will burn easily in air. 



529. The backs of books that have been kept in cases for several 



years are not as bright colored as the side covers. 



530. If you try to burn a book or magazine in a grate, only the 



outer pages and edges burn. 



SECTION 56. Neutralization. 



When you put soda in vinegar, what makes the vinegar less 

 sour? 



When we use sour milk for cooking, why does the food not 

 taste sour? 



