Quantative Chemistry
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20 Terms
What is the law of conservation of mass?
No atoms are lost or made during a chemical reaction
In a chemical reaction, is there any change in the overall mass of the substances?
No
Give 2 reasons why the total mass may appear to change during a chemical reaction
the gas may react with other chemicals increasing the mass
the gases may escape decreasing the mass
What is the rule for balancing equations?
Total number of reactants = Total number of products
What is the definition of relative atomic mass?
The average mass of all the isotopes of that element
What is the symbol for relative atomic mass?
Ar
On a periodic table, is the RAM the larger or smaller number for each element?
The larger number
What is the symbol for relative formula mass?
Mr
What is the molar volume of a gas?
24 dm 3 (24,000 cm3)
What is the concentration of a solution?
The amount of solute dissolved in a volume of solution
How do you convert cm3 → dm3
Divide by 1000
How do you convert dm3 → cm3
Multiply by 1000
What are the 3 forms of formula that links mass, Mr and moles?
mass = moles x Mr
moles = mass/Mr
Mr = mass/moles
What is molar ratio?
the ratio between the moles in a balanced equation
What is the molar ratio in : 1N2 + 3H2 → 2NH3
1 : 3 : 2
What is the molar ratio in : 1Zn + 2HCl → 1ZnCl2 + 1H2
1:2:1:1
What is the formula that links moles, mass and Mr?
mass = moles x Mr
What is a mole?
A unit of measure (6.02 × 1023)
What is Avogadro’s constant?
The value of the constant is 6.02 × 1023
Rearrange the formula to get moles by itself: mass = moles x Mr
moles = mass/Mr