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Measurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible results); they may be both accurate and precise; or they may be neither accurate nor precise.
Learn about and revise calculations in chemistry with this BBC Bitesize GCSE Chemistry (AQA) study guide.
- Bracket notation. When it’s used: In condensed formulas. What it means: Signifies that a substituent is attached directly to the preceding carbon. Example: CH3C(O)CH2CH3 (2-butanone)
- n-, s-, and t- When it’s used: for short chain alkanes and alcohols. What it means: n- means “normal” – an unbranched chain with the functional group (if present) on the 1-position.
- The N- prefix. When it’s used: for amines and amides. What it means: The N– signifies that the substitutent is connected to the nitrogen. Example: N-methyl butylamine, N,N-dimethylformamide.
- L and D. When it’s used: for sugars and amino acids. What it means: It goes back to Emil Fischer, who designated the two enantiomers of glyceraldehyde (the simplest sugar) L-glyceraldehyde and D-glyceraldehyde.
Jul 3, 2017 · The monomer is most commonly a derivative of ethylene. addition reaction – An addition reaction is a process or reaction where a small molecule (e.g., H 2) is inserted directly into a double or triple carbon bond. adenosine triphosphate – ATP is the acronym for the molecule adenosine triphosphate.
What does the noun triviality mean? There are two meanings listed in OED's entry for the noun triviality . See ‘Meaning & use’ for definitions, usage, and quotation evidence.
Feb 27, 2015 · By writing $\ce{AB.xCD}$ chemists mean that there are CDs are found in the crystalline framework of AB. The most common example of this is water trapped inside the crystal structure of ionic compounds. (See water of crystallization in wikipedia)
The formula of a compound shows how many atoms of each element are bonded together. The formula is made up of symbols and numbers. The numbers are written as subscript, which...
