Week 4 Flashcards
What happens when going from grams to moles?
Since the ratio of moles to atomic mass units can also be the ratio of moles to grams, the mass of an atom is treated as grams, not atomic mass units.
1 mole is equal to what?
The atomic mass of an element.
Molecular mass is also called what?
Formula mass and molecular weight.
Equation of mass percent
%A = (mass A/total mass) * 100
Define empirical formula
The simplest chemical formula that only says the mole ratios of elements in a compound.
Are molecular formulas and chemical formulas the same?
Yes.
Define molecular/chemical formulas
They describe the actual number of atoms of each element in a compound.
Chemical change
Where atoms change partners and one chemical is a new chemical.
Physical change
A change that just changes the substance’s appearance and phase.
Chemical symbol for gas
(g)
Chemical symbol for liquid
(l)
Chemical symbol for solid
(s)
Chemical symbol for aqueous
(aq)
Define aqueous
Dissolved in water
What are energy symbols used for?
they are used above the arrow in chemical equations for decomposition reactions.
