Chemical Equations
A description of a reaction using element symbols and chemical formulas.
What is a chemical equation?
In a chemical equation, the mass of the products is always ______ to the mass of the reactants because of the __________________________.
What is equal and law of conservation of mass?
A ______ is a type of change in matter in which new substances are not formed.
What is a physical change?
In order to determine if a chemical equation is _____________, we have to check if the number of atoms of each type of element are the same on both sides of the equation.
What is balanced or unbalanced?
These are found on the left side of the equation and can be either elements or compounds.
What are reactants?
Synthesis, decomposition, replacement, and combustion.
What are the four main types of chemical reactions?
Combustion form.
What is (any substance)+O2→substance(s)?
An ______ reaction is a chemical reaction that absorbs thermal energy.
What is endothermic?
These are found on the right side of the equation and can be either elements or compounds.
What are products?
Synthesis form.
What is A+B→AB?
A substance that lowers the activation energy of a reaction and increases the reaction rate.
What is a catalyst?
An _____ reaction is a chemical reaction that releases thermal energy.
What is exothermic?
The element symbols and subscript numbers showing how many of each element are combined in a compound.
What is parts of the equation?
Decomposition form.
What is AB→A+B?
A substance that slows down or stops a chemical reaction.
What is an inhibitor?
If a chemical equation is unbalanced, we must add reactants, products, or both until it becomes _____.
What is balanced?
Increasing the surface area of a reactant that is a solid, increasing the temperature of reactants, increasing the concentration of reactants, or increasing the pressure of reactants which are gases.
What are ways to increase the rate of a chemical reaction?
Replacement form. (Single) and (Double)
What is AB+C→AC+B and AB+CD→AC+BD?
Decomposition reactions are the _____ of synthesis reactions.
What is opposite?
The presence of bubbles is an example of a sign of a chemical reaction, but the only sure way to know if a chemical reaction has taken place is if new ______ are formed.
What are substances?