ATI - RN Nutrition > SUMMARY > Kitchen Elements (All)
Model 1. All of the elements on the periodic table can be found in nature as pure substances. An element is made of atoms, therefore a sample of the element calcium would be made of many calcium atoms... . A compound is also a pure substance. A compound is made of molecules, therefore a sample of the pure compound water would be made of many water (i.e. H2O) molecules. Table 1.1. Examples of various types of matter at room temperature (70°F/21°C) Item Classification Is it a Molecule? Chemical Formula Calcium Element No Ca Sodium Element No Na Iron Element No Fe Oxygen Element Yes O2 Carbon dioxide Compound Yes CO2 Water Compound Yes H2O Vitamin C Compound Yes C6H8O6 Sodium chloride (i.e. table salt) Compound Yes NaCl Sucrose (i.e. table sugar) Compound Yes C12H22O11 Monosodium glutamate (i.e. MSG) Compound Yes NaC5H8O4N Molecules are formed from the bonding of two or more atoms. Most matter on earth, including food, is a mixture of different types of molecules. A molecule is the smallest, neutral (that is, without charge) unit of a substance formed by bonding two or more atoms together. Molecules and compounds are often used interchangeably to describe a substance. The simplest way of thinking about it is that a compound must contain at least two different elements and a molecule is anything that has more than one atom. [Show More]
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