Chemical Reactions Unit Flashcards
What is the most important sin of a chemical reaction?
A change of properties
What are four signs of a chemical reaction?
Gas formation, solid formation, energy change, and color change
What must happen for a chemical reaction to take place?
The original bonds must break and new bonds form
What are reactants?
The starting material in a chemical reaction
What are products?
The substances formed from a reaction
What elements replace others in single displacement?
A more reactive element displaces a less reactive element
What is one of the products if a double displacement reaction?
A gas or precipitate
What are three types of energy released in exothermic reactions?
Light energy, electrical energy, and thermal energy
What is an example of a endothermic reaction?
Photosynthesis
What two conservation laws are there?
Law of conservation of energy and mass
What is an activation energy?
The boost of energy that causes the reaction to start
What are four factors that affect rates of reactions?
Temperature, concentration, surface area, and inhibitors
What is a catalyst?
A substance that speeds up a reaction without being permanently changed
What is an inhibitor?
A substance that slows down or stops a helical reaction
In an endo and exothermic graph, what is the first straight line for?
Reactants
In an exothermic reaction, what is the hill and part of the downhill for?
The activation energy
In an exothermic reaction, what is the last part of the downward hill for?
Energy given off
In an endo and exothermic reaction, what is the last straight line for?
The products
In an endothermic reaction, what is the upward hill for?
Activation energy
In an endothermic reaction, what is the first part of the hill also?
Energy absorbed
In the graphs, what is the x axis for?
Reaction progress
In the graphs, what is the y axis for?
Energy
What do the valence electrons do in ionic bonds?
Electrons are transferred
What do valence electrons do in covalent bonds
Electrons are shared
After tam chemical change takes place, what happened to the properties?
They can be different
What makes chemical bonds break?
When the molecules bump into each other with enough energy.
How many atoms make up a diatomic molecule?
2
What are usually in covalent compounds?
Nonmetals
What are ionic compounds made of?
A metal and nonmetal
What is the charge of an ionic compound?
Neutral
