1.1 MATTER Flashcards
Difference between compound and substance
Compound can be separate w chemical method to elements
Difference in mixtures and pure substance
Mixture
2+ substance
Eg alcohol and water
Substance have constant composition n distinct properties eg water
How to find average atomic mass
£QM/Q
Q is relative abundance of isotopes
M is the mass of elements
What is percentage abundance
Quantity/ amount
What is mass spectrometer for
To determine:
Relative atomic mass (Ar) of an element
- Relative molecular mass (Mr) of a compound
- Types of isotopes that are found in the naturally occurring element
including the abundance of the isotopes and
its relative isotopic mass.
• The structure of the compound in an unknown sample.
What does
The most abundant mean
The isotopes that have the highest percentage of relative abundance (Q)
Bilangan pling bnyk exist
What can i get from a mass spectrum?
Describe what i can get from the graph
Y-axis
Relative abundance (percentage)
X axis
The mass or charge ratio (m/e)
x-axis indicates the mass/charge ratio (m/e), which equals the mass divided by +1, for unipositive ions detected by spectrometer.
The m/e values are measured to identify the masses of different isotopes of an element.
What is average atomic mass
The average of mass of its naturally occurring isotopes weighted according to their abundances
How to fimnd percentage abundance
Percentage abundance
= relative intensity/£mass
^ idk the context but prollly wrong
Subtitute with x and y
^use this instead
Whats the difference between relative intensity and percentage abundance
N
Difference in average atomic mass and relative atomic mass
Average- unit is amu
Relative divide by 1/12 x the mass
To delete thw amu
What is mass spectrum?
Graph that shows the mass and percentage abundance
