Unit 3 Flashcards
What is the conservation of mass?
in a chemical reaction, atoms are not created or destroyed, just rearranged, so total mass before = total mass after the reaction
When a metal forms a metal oxide, why does the mass increase?
atoms from gaseous oxygen have been added
When an acid reacts with a metal, why does the mass decrease?
a gas is produced and escapes
What is relative formula mass?
the sum of the relative atomic masses of each atom in a substance
What are the four state symbols and what do they stand for?
(s) solid
(l) liquid
(g) gas
(aq) aqueous or dissolved in water
How can you tell when a symbol equation is balanced?
the number of atoms of each element is the same on both sides
What is a unit for concentration?
g/dm3
Which formula is used to calculate concentration from mass and volume?
concentration (g/dm3)= mass(g)
volume(dm3)
Which formula is used to calculate volume from concentration and mass?
volume (g/dm3)=mass(g)
concentration(g/dm3)
Which formula is used to calculate mass from concentration in g/dm3 and volume?
mass (g) = concentration (g/dm3) × volume (dm3)
How can you convert a volume reading in cm3 to dm3?
divide by 1000
If the amount of solute in a solution is increased, what happens to its concentration?
Increases
If the volume of water in a solution is increased, what happens to its concentration?
Decreases
