Which reaction is an example of heterogeneous catalysis? •Ethene gas reacts with hydrogen gas using a nickel catalyst.
•Hydrogen peroxide decomposes by using an aqueous iodide ion catalyst.
•Formic acid decomposes by using an acidic catalyst.
•Sulfur dioxide gas is converted to sulfur trioxide gas by using nitrogen chloride gas.

As you move from right to left on the periodic table the atomic radius fill in the blank

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.

Ok, so i have 2 questions. try to answer them both: (the topic is fire) 1) how can you represent the chemical reaction of fire? 2) what kind of bond is formed in this chemical reaction