Chemical Reactions
What THREE things must happen for a chemical reaction to occur?
1. Old bonds are broken 2. Atoms are rearranged 3. New bonds are formed
What is the term for "The energy needed to start a chemical reaction"?
Activation Energy
What are TWO ways you can increase the rate of a reaction?
Add a catalyst, Heating
What is the term for "An equation in which the number of atoms of each element on the reactant's side is equal to the number of atoms of each element on the product's side"?
Balanced Equation
What are TWO clues that a chemical reaction is occurring?
Bubbling, fizzing, energy change
What is the term for "A substance that increases the reaction rate without being permanently changed"?
Catalyst
What is the term for "A description using chemical symbols and formulas to show the reactants and products in a chemical reaction"?
Chemical Equation
What is the term for "The process by which one or more substances are transformed into different chemical substances"?
Chemical Reaction
What is the term for "A whole number written in front of a chemical symbol or formula in a chemical equation"?
Coefficient
How does a balanced chemical equation show that mass is never lost or gained during a chemical reaction?
Each side of the equation has the same type and number of atom.
What is the term for "A chemical reaction in which energy is absorbed"?
Endothermic Reaction
A chemical reaction cannot occur without ________________.
Energy
What is the term for "A chemical reaction in which energy is released"?
Exothermic Reaction
What is a substance that slows down or stops a chemical reaction?
Inhibitor
What is the term for "A substance used to slow down or stop a chemical reaction"?
Inhibitor
What is the term for "Law that states that mass is neither created nor destroyed in ordinary chemical and physical changes"?
Law of Conservation of mass
What is the term for "The substances formed from a chemical reaction"?
Products
What is the difference between a reactant and a product?
Reactant is what the reaction starts with, the products are what is formed after the reaction.
What is the term for "The substances present before a chemical reaction occurs"?
Reactants
How do the properties of the reactants compare to the properties of the products?
Reactants have complete different properties from the products
What is the term for "A measure of how rapidly a reaction takes place"?
Reaction Rate
Give an example of a chemical change.
Rust, Oxidation
Give an example of an inhibitor
Salt
Give an example of a physical change.
Tearing, cutting
Why are chemical equations important to science around the world?
They can be understood around the world in all different languages without having to translate.