Chemistry Reading #3 Flashcards
What happens when two or more molecules interact and change chemically?
A reaction occurs through the breaking of bonds and the formation of new bonds.
What are the classifications of chemical reactions?
Synthesis, decomposition, single replacement, double displacement, combustion, and polymerization
What does the Law of Conversation of mass tell us?
All chemical reactions must be balanced in terms of the number of atoms involved.
What does the formation of bonds release?
Energy
What does the breaking of bonds require?
Energy
What is a chemical reaction?
a process that rearranges the atoms in any substance(s) to produce one or more different substances; the process that creates chemical changes
What is a chemical equation?
an expression that describes the changes that happen in a chemical reaction, typically of the form reactants → products
What is a reactant?
a substance that is used or changed in a chemical reaction; the starting material or substance in a chemical reaction
What is a product?
a substance that is created or released in a chemical reaction
What do symbols represent?
The state of matter
Where to particles in a solid react?
At their surface
What does the greek letter Delta Δ indicate?
It indicates that heat is the catalyst in a chemical reaction.
What is aqueous (aq) mean?
Dissolved in water
What does insoluble mean?
not dissolvable in a particular solvent
What does soluble mean?
a substance that is able to dissolve in water.
Translate this equation to words
Two moles of hydrogen gas plus a mole of oxygen gas yield two moles of liquid water.
Balance this reaction
What is a synthesis reaction?
a reaction in which two substances combine to form a third substance, also known as a combination reaction
What does exothermic mean?
the products and reactants lose energy overall during the reaction.
What does indothermic mean?
Energy is absorbed by the system so the net change in enthalpy during the reaction is positive and ΔH has a positive sign.
