12772296
Description
Flashcards by Aaishah Din, updated more than 1 year ago
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Created by Aaishah Din
over 6 years ago
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| Question | Answer |
| Define Relative atomic mass | The mean relative mass of all the isotopes of an element, compared with the standard carbon atom. |
| define relative formula mass | all of the masses of each element in a compound, added up |
| Define mole | a mole of a substance is simply the RFM or RAM of it expressed in grams. A mole of a substance always has the same number of ions, molecules, or atoms in a mole: 6.02x10^23. |
| define Avagadro's constant | 6.02x10^23 |
| Give the formula connecting moles, mass, and and Ar or Mr | Moles = Mass/Mr |
| What can you tell from a balanced symbol equation | You can tell how many moles of each substance, and what mass of a substance, you need to carry out the equation |
| Give the steps to balancing equations using moles | 1) find the masses of each substance 2) Find out how many moles of each substance you have 3) find the whole number ratio of numbers of moles |
| Define limiting reactant | The reactant that gets used up first in a reaction |
| Give the formula for percentage yield. | yield: actual mass produced/maximum theoretical mass of product possible |
| Give factors why yield may not be 100% | 1) the reaction is reversible 2) some reactants produce unexpected products 3) some product left behind in the apparatus 4) reactants may not be completely pure 5) may be difficult to separate product we want |
| What is atom economy | the measure of the extent to which the atoms in the starting materials ends up in the desired product |
| why is atom economy important? | It saves money, and wastes less raw materials; it also reduces pollution and the number of limited resources used. |
| what is the equation for atom economy | relative formula mass of the desired product ÷ sum of RFM of reactants of the equation |
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