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In chemistry, compounds are created from two or more different atoms bonded together. For instance, H2O represents water, while C6H12O6 denotes glucose. Chemical formulas include important elements like subscripts, which indicate the number of specific atoms present in a molecule (e.g., Al(NO3)3 contains 1 aluminum, 3 nitrogen, and 9 oxygen atoms). Additionally, coefficients to the left of a formula define the number of molecules, such as 5NaCl corresponding to 10 total atoms. Explore concepts in biochemistry and practice counting atoms with this guide.
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Remember! • Compounds are made of 2 or more atoms of different kinds bonded together! H2O - Water C6H12O6 - Glucose When looking at a chemical formula, you may notice subscripts!
Biochemistry Counting Atoms
Subscripts • Written below the level of the line • Signify the number of atoms in the molecule 1 Mg atom + 2 Cl atoms MgCl2 C6H12O6 - Glucose
Subscripts • Al(NO3)3 There is 1 Al, 3 N, & 9 O! • (CH3)3CH There are 4 C & 10 H!
Coefficients • Written to the left of the molecule • Signify the number of molecules 5NaCl 5 molecules of NaCl 10 total atoms • 3NO2 contains 3 N & 6 O! C6H12O6 – Glucose 2C6H12O6 – 2 Glucose molecules!
Counting Atoms • Practice Qs
