LEC MOD 3 Flashcards
A written statement that uses chemical symbols and chemical formulas instead of words to describe the changes that occur in a chemical rxn
Chemiical Equation
starting material in a chem reaction that undergoes change
Reactants
what does the meaning of arrow in a chem equation?
to produce
substance produce as a result of chem rxn
products
what does the plus sign mean in a chem equation?
reacts with and with
monoatomic
He,Ne,Ar,Kr,Xe
Diatomic
H2, O2, N2, F2, Cl2, Br2, I2
Tetraatomic
P4, As4
when elements ends with suffixes -ggen and -ine, what are their classification?
Diatomic
equation that has the same number of atoms on each element involved in the reaction on each side of the equation
Balanced Chemical equation
law of conservation of mass
atoms are neither created nor destroyed
process in which at least one new substance is produced as a result of chemical change
Chemical reactions
evidences of chemical change
color change
precipitate
gas and heat
odor change
Synthesis reaction; single product is produced from two or more reactants
Combination; A + B=AB
single compound breaks into 2 or more simpler substance
Decomposition; AB= A+B
AKA single displacement rxn; atom or molecules replaces an atom from a compound
Single replacement rxn;A+BC=Ac+B
two substances exchange parts with one another and form two different substancess
Double replacement; AB+CD=AD+CB
occurs when two ionic compounds are dissolved in h2o and form new ionic compound that does not dissolve
precipitation
“acid-base reaction”; an aquaeous acid-base rxn generally produces water and salt
Neutralization
reaction between substance and O2 that evolves to heat and light
CH+O2=CO2+H2O+fire
determination of the dimensionss,capacity, quantity or extent of something
Measurement
a measure of the total quantity of matter in an object
Mass
basic unit of mass in metric system
Gram (g)
a measure of the amount of space
Volume
