C3
No description yet. This curated deck is ready for daily study.
Card preview (24)
What elements are diatomic?
All of group 7 Oxygen Hydrogen Nitrogen
What does Sulfur molecules exist as?
S8
What is the molecule phosphorus ?
P4
What does the molecular formula show?
The symbol for each element and the number of atoms in each element
Hydroxide ion:
OH-
Nitrate ion
NO3-
Carbonate ion:
CO3 2-
Sulfate ion
SO4 2-
How do you form ionic compounds?
Switch their charge number for a subscript number but the other way round
Ammonium ion
NH4 +
What is the law of conservation of mass?
During a chemical reaction no atoms are created or destroyed
What is the explanation if the mass increased?
One of reactants was a gas (which wasn’t weighed)
What is the explanation for when mass decreases
One of the products was a gas escaped and therefore mass was not accounted for
How do you show that mass has been conserved in a reaction?
Add up the relative masses (Mr) of each side to see that they are the same
Ammonia
NH3
What does aqueous mean?
Dissolved in water
How do you balance equations?
Use big numbers Make sure there are the same amount of atoms on one side than the other Do hydrogen and oxygen last
How do you write half equations?
Focus on one reactant, whether it lost of gained electrons *one side will be neutral and the other will have a charge If lost electrons instead of subtracting m add in the other side
Half equations rules
If became positive: lost electrons If became negative: gained electrons
How do you write ionic equations
Exclude the spectator ions Write the charge and state for the remainder
What are spectator ions?
Ions that do not change state or charge in a reaction
What state is a precipitate?
Solid
What is the definition of a mole?
amount of substance that contains the same number of particles (6.02 × 1023) as there are atoms in 12.0 g of 12C
What is the definition for avogadro’s constant?
The number of entities in one mole , equal to the number of atoms in 12g of carbon-12 atoms