Physical Science Flashcards
A chemical reaction
A chemical reaction happens whenever atomic bonds are formed or broken
What are the initial ingredients in a chemical reaction called?
Reactants
What are the resulting substances of a chemical reaction called?
Products
How do you speed up a chemical reaction?
Adding heat, increase surface area, increase concentration of reactants, or add catalysts.
A+B=AB
Composition Reaction
AB=A+B
Decomposition Reaction
AC+DE–ADE+C
Single Displacement Reaction
AC+DE–ADE+C
Single Displacement Reaction
AC+DE–AD+CE
Double Displacement Reaction
Enzymes
A catalyst found in living cells
Catalyst
A substance added to speed up a reaction.
Inhibitors
Prevents reactions by keeping reactants apart and bonding with one of the reactants
A chemical Equation
It describes what happens in a chemical reaction
Reactants
What are the elements or compounds on the left side of a chemical equation called?
What are the elements or compounds on the right side of a chemical equation called?
Products
Why is it helpful to use a chemical equation?
So that you don’t have to write out all the molecules.
How does a catalyst work?
It reduces the amount of energy needed for a reaction
Why is it important that living cells have enzymes?
If we didn’t, chemical reactions would occur so slowly that we wouldn’t be able to live.
What is an exothermic reaction?
A reaction that releases energy
A reaction that stores energy.
What is an endothermic reaction?
Enthalpy
The amount of energy stored in a substance’s bonds.
Homogeneous catalyst
If the catalyst and the reactants are in the same phase, they are called…
Heterogeneous catalyst
If the type catalyst is one that is in a different phase from the reactants, they are called…
The rate at which the reaction takes place
Reaction Rate
First law of thermodynamics
The law that says matter and energy cannot be created or destroyed, they can only change forms.
Activation Energy
The energy available to break the necessary bonds.
