6.1- Synthesis, decomposition and displacement reactions can be represented by equations

Question 1

Law of Conservation of Mass

Answer 1

That mass is neither created nor destroyed in chemical reactions, only transferred. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Question 2

Synthesis Reaction

Answer 2

A reaction where two or more reactants combine to form a single product.
General Formula:
A + B -> AB

Question 3

Writing Chemical Equations

Answer 3

1. Write the chemical formula for each of the molecules
   a. Are they ionic or covalent compounds?
   b. Use the subscript numbers to indicate the number of each type of atom in the molecule
2. Count the number of atoms on each side of the equation to ensure that no atoms are created or destroyed (law of conservation of mass)
   a. If more atoms are required, add a coefficient before the molecule
3. Determine whether the reactants and products are solids (s), liquids (l), gases (g), or aqueous solutions (a soluble solution mixed with water) (aq)
   - All equations should be written in balanced form

Question 4

Decomposition Reaction

Answer 4

A compound breaks down into simpler products from the energy in the form of heat and electricity (thermal). An electrolytic decomposition is the breakdown of a compound because of an electric current passing through the solution. - Electrolysis equipment has two diodes- an anode and a cathode. A different chemical reaction occurs at each diode and are endothermic as they require energy to occur
General equation: AB-> A + B

Question 5

Single Displacement

Answer 5

A more reactive element replaces another less reactive element on a molecule. A + BC-> AC + B

Question 6

Double Displacement

Answer 6

Two reactants exchange ions to form two new products. AB+ CD-> AD + CB