UNIT 2 -- LIVING ENVIRONMENT

Fill in the blanks below with the short form of the elements already given. 1) Carbon: __[blank_start]C[blank_end]__ 2) Oxygen: __[blank_start]O[blank_end]__ 3) Hydrogen: __[blank_start]H[blank_end]__ 4) Nitrogen: __[blank_start]N[blank_end]__

Fill in the blanks with the complete form of the following short form elements. 1) C: ___[blank_start]Carbon[blank_end]____ 2) O: ___[blank_start]Oxygen[blank_end]___ 3) H: __[blank_start]Hydrogen[blank_end]__ 4) N: ___[blank_start]Nitrogen[blank_end]__

Choose the correct meaning for the following words (choose the letter representing the correct answer before the word). 1) Element: ( [blank_start]B[blank_end] ) A. two or more atoms are combined and act as a single particle. B. substances that make up matters. C. force (energy) that combines elements chemically. D. combination of different elements.

Choose the correct meaning for the following words (choose the letter representing the correct answer before the word). 2) Molecule: ( [blank_start]D[blank_end] ) A. force (energy) that combines elements chemically. B. substances that make up matters. C. combination of different elements. D. two or more atoms are combined and act as a single particle.