day 5 week 1

# 1 ISBS


13. On paper


14. i, ii, and iv represent elements. iii, v, vi, represent compounds.


15. Compounds and elements are represented by chemical formulas.


16. a. 3 hydrogen atoms, 4 oxygen atoms, 1 phosphorous atom b. 1 sodium atom, 1 oxygen atom, 1 hydrogen atom c. 1 sulfur atom, 2 oxygen atoms


17. On paper


18. a. NaHCO3 + HCI ---> NaCl + H2O + CO2 b. C6H12O6 + O6 ---> 6CO + 6H2O