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Balancing Word Equations

(Remember the following are diatomic: H2, N2, O2, F2, Cl2, Br2, I2)
Write the chemical formulas for each reactant and product. Watch out for upper and lower cases!
Subscripts are on the bottom right. Acids have the (aq).
Balance the chemical equation. Must show your work on the balancing (the counting of atoms).

1. Dihydrogen monoxide ® hydrogen + oxygen

2. copper (II) nitrate + dihydrogen monoxide ® nitric acid + copper (II) hydroxide

3. phosphorus + oxygen ® diphosphorous pentoxide

4. iron + hydrochloric acid ® iron (II) chloride + hydrogen

5. sodium hydroxide + phosphoric acid ® sodium phosphate + dihydrogen monoxide

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products