Unit 3-Quantites in Chemistry Flashcards Preview

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Flashcards in Unit 3-Quantites in Chemistry Deck (13)
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1

calculate molar mass

grams per mole

(from the periodic table)

2

law of definite proportions
steps

percent composition to mass to move to mole ratio to WNR to simplest formula

3

calculate the number of entities from mass

use the relationship

6.02x10^23 over 1 mol

4

molecular formula determination

take the simplest formula and find the grams per mole. divide the mass of the molecular formula by the mass of the simplest formula and multiply by the simplest formula to get the molecular formula

5

stoichiometry

using the mole concept and balanced chemical equation to solve problems

6

mass – mass problems

given the grams of one substance to find the grams of another substance using a balanced chemical equation

7

percentage yield

actual yield divided by theoretical yield multiplied by 100

8

actual yield

The amount measured in an experiment

9

theoretical yield

from stoichiometric calculations

10

why does something have a greater than 100% yield?

air could react with reagents

11

what would cause a yield less than 100?

spattering, impurities of reagents, loss through transfer, unideal conditions

12

limiting reagent problems

steps

1. underlined the given and asked to find
2. balance the chemical equation
3. determine the moles of the given from the mass
4. which is the limiting reactants? She was one given and multiply by the mall relationship from equation if the number is less that then not given is limited is more the other is limited
Continue steps with limited reactant!!!!
5. determine the number of moles of asked to find
6. determine the mass of asked to find
7. therefore statement

13

balancing equations

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