Balancing Practice (some of these may be in the simulation)
Balance the following equations. You may find it useful to use scratch paper to write how many atoms of each element you have on both sides of the reaction.

16. P4(s) + F2(g) → PF3(s)

17. ___C(s) + H2O(g) → CH4(g) + CO2(g)

18. HgO(s)→ O2(g) + Hg(l)

19. CaCO3(s) → CO2(g) + CaO(s)

see below

Explanation:

16. 1 P₄(s) + 6 F₂(g) → 1 PF₃(s)

17. 2 C(s) + 2 H₂O(g) → 1 CH₄(g) + 1 CO₂(g)

18. 2 HgO(s)→ 1 O₂(g) + 2 Hg(l)

19. 1 CaCO₃(s) → 1 CO₂(g) + 1 CaO(s)

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.