How Much?
- Created by: Chiara
- Created on: 24-03-13 16:13
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- How Much?
- Isotopes are atoms of the same element with a different no. of neutrons.
- Percentage of an element in a compound= relative mass/total relative mass x 100
- A reverible is when the products of the reaction can react to make the reacants again.
- A food additive is a substance added to extend its shelf life or taste or appearance.
- The e no.s are codes to identify the additives
- Eg E102 is the yellow food colouring called tartrazine
- The e no.s are codes to identify the additives
- Paper chromatography is used to indentify food additives.
- It works as some compounds dissolve better than others. When they are seperated they can be indentified.
- Modern instrumental techinques provide fast, accurate and sensitive ways of indentifing chemical substances.
- Gas chromatography can be used to seperate compounds in a mixture.
- Once seperated they can be indentified using a mass spectrometre
- This can be used to find the relative modular mass from it molecular ion peak.
- Once seperated they can be indentified using a mass spectrometre
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