Read Carefully. Place your name and address on the first sheet of the test. Use a light grade of paper and write on one side of the sheet only. Do not copy answers from the lesson paper. Use your own words, so that your instructor may know that you understand the subject. Read the lesson paper a number of times before attempting to answer the questions.

1. What do you understand a "chemical element" to be ? Name all that you have ever seen.

2. What is a "saturated solution?"

Name the substances usually found in the house which are soluble in water.

3. What causes atmospheric pressure? Explain some effects of it.

4. Why must the diet of animals include fresh air ?

5. Explain the effect of cooking on starch. (b) On fats. (c) On proteids.

6. What are the products of combustion in burning coal or wood ?

7. What is meant by "conservation of matter?"

8. How can the boiling point of water be raised?

How may it be lowered?

9. What is meant when it is said that a chemical substance always has the same composition ?

10. What is "latent heat?"

11. What can you say of the composition of meat?

12. Explain the physical and chemical changes which starch must undergo before it is absorbed into the circulation.

13. What can you say of the chemistry of breadmaking ?

14. Why is distilled water pure?

15. Explain the composition of water.

16. Describe the chemistry of a sulphur match.

17. How is charcoal prepared? How is coke made?

18. Why does the proportion of carbon dioxide in the atmosphere not increase?

19. In what different ways is food used in the body?

20. Do you understand all parts of this lesson paper ?

If not, what part is not clear ?

Note. - After completing the test sign your full name.

Made to fit in the bottom of a wash boiler. The formation of steam forces the hot, soapy water up the spouts, over and through the clothes.

A Mechanical Washing Device

Rotary Type Of Washer Piston Water Motor Attached

"1900" Washer Electrically Driven