Exam 4 Flashcards
what is a oxidation-reduction reactions?
when electrons are transerred from one substance to another
what are some clues of a chemical reaction?
color change, formation of a solid in a previously clear solution, formation of a gas when you add a substance to a solution, emission of light, emission or absorption of heat
what kind of change is boiling water?
physical change
What are teh substances on the left side of a chemical equation called?
reactants
what are the substances on the right side of a chemical equation called?
products
what is an aqueous water solution?
homogeneous mixture of a substance with water
to balance an equation what do we insert in the front on an equation/
coefficients
When balancing never do what?
change the subscripts
when is a compound soluble?
if it dissolves in that liquid
when is a compound insoluble?
when it does not dissolve in a liquid
does the aqueous solution AgNO3 dissolve in water?
yes
what is a precipitation reaction?
reactions that form a solid upon mixing two aqueous solutions
what is the key to predicting precipitation reactions?
understanding that only insoluble compounds form precipitates
what is a molecular equation?
an equation showing the complete neutral formulars for every compound in the reaction
what is a complete ionic equation?
equations that show aqueous ionic compounds that normally dissociate in solution as they are actually present in solution
what is an acid-base reaction?
reactions that form water upon mixing of an acid and a base
what is another name for acid base reactions?
neutralization reactions
what does a neutralization reaction usually form?
water and an ionic compound - called a salt - that usually remains dissolved in the solution
what is an oxidation-reduction reaction?
reactions involving the transfer of electrons
what is oxidation?
loss of electrons
what is reduction?
gain of electrons
what are signs of a redox reaction?
substance reacts with elemental oxygen, metal reacts with a nonmetal, and one substance transfers electrons to another substance
what is a combustion reaction?
type of redox reaction
what happens in a comubstion reaction?
the reaction of a substance with O2 to form one or more oxygen-containing compounds, often including water
compounds containing carbon and hydrogen always from what?
carbon dioxide and water upon combustion
