C3 - Quantitative Chemistry Flashcards
(18 cards)
What is the conservation of energy?
Quantitative Chemistry
What is relative formula mass?
The relative formulas mass is the
sum of all the relative atomic
masses of the atoms in the
formula.
Consontration of a solution equation is …..
concentration (g/dm3) = mass (g) ÷ volume of solvent (dm3)
Mass of dissolved substance equation is ……
mass (g) = concentration (g/dm3) × volume (dm3)
What is the equation for percenatge mass of a compound?
percentage mass of an element in a compound = Ar x number of atoms in that element / Mr of compund
What does Ar mean?
The relative atomic mass
What does Mr mean?
relative formula mass
During a reaction the mass can change. If one of
the reactants is a gas, the mass can do what?
Go up!
If one of the products is a gas, the mass can do what?
Go down!
What law states that matter cannot
be created or destroyed just
rearranged?
Conservation of mass
When a metal forms a metal oxide
why does the mass increase?
Atoms of oxygen from air added
When a metal reacts with an acid
why does the mass decrease?
Gas is produced and escapes
What is defined as the sum of
relative atomic mass of each atom in
a substance?
Relative formula mass (Mr)
What are the four state symbols and
what do they stand for?
(s) solid
(l) liquid
(g) gas
(aq) aqueous
What is the unit for concentration?
g/dm3
How can you tell when a symbol
equation is balanced?
there is equal amounts of atoms on
each side of the equation.
How do you convert cm3
to dm3
?
÷ 1000
If the amount of solute in a solution
increases, what happens to the
concentration?
concentration increases
