CHEM (Ch. 6)

Question 1

What is a word equation?
What is a chemical equation?

Answer 1

Word Equation: names of the chemicals are written out in full
Chemical Equation: chemical formulas are used to represent the chemicals

Question 2

What are reactants?
What are products?

Answer 2

Reactants: the substances that are used up during the reaction
Products: the substances that are produced during the reaction

Question 3

What is the law of conservation of mass?

Answer 3

Total mass of reactants = total mass of products. Use coefficients to balance equations.

Question 4

What is a synthesis reaction?

Answer 4

When two simple reactants combine to make a larger or more complex product (A + B -> AB)

Question 5

What is a decomposition reaction?

Answer 5

Opposite of a synthesis reaction - large compounds are broken down into smaller compounds or elements (AB -> A +B)

Question 6

What is a single displacement reaction?

Answer 6

When one element displaces an element in a compound (A + BC -> AC +B)

Question 7

What is a double displacement reaction?

Answer 7

When two elements in different compounds trade places. (AB +CD -> AD + CB)

Question 8

What is complete combustion (+ chem formula)? What is incomplete combustion?

Answer 8

A chemical reaction in which a fuel burns or reacts quickly with oxygen. Chemical formula: hydrocarbon + O2(g) → CO2(g), H2O(g), energy.
Incomplete combustion occurs if oxygen supply is limited; leaves a sooty residue and CO gas in addition to carbon dioxide and water.

Question 9

What is corrosion?

Answer 9

The breakdown of a metal as a result of chemical reactions with its environment