Unit 2-Atomic Structure, Analysis And Quantitive Chemistry Flashcards
What is the relative formula mass?
All the Ar’s added together
Mass (grams) divided by the Mr = ……..
Number of moles
How do you find the percentage mass of an element in a compound?
Divide the Ar times by number of atoms in the element by the Mr of the whole compound and times 100
Name the 5 steps of finding the empirical formula?
1) list all elements in compound
2) next to each one write the percentage mass
3) percentage mass divided by the Ar
4) make it into simple ratios
5) put the numbers next to the elements
Name the 3 steps to calculate the mass in reactions?
1) write out balanced equation
2) write out the Mr of the 2 compounds you want
3) using the ratio divide to get 1 and times to get how much they want
Yield is the……
Mass product
How do you work out the percentage yield?
Divide the actual yield by the predicted yeild times by 100
What does 100% yeild mean?
You got all the predicted products
What does chromatography do?
Uses filter paper to extract colours from an artificial dye
What is the retention time?
The initial time for gas to reach detector
What is usually the relative atomic mass?
Mass number
