Writing a symbol equation. Chemical reactions can be represented using symbol equations. In a symbol equation, substances are written using their chemical symbol or formula.

T he world's oldest known system of writing was influenced by symbols used for trade — engravings found on cylinders used in the exchange of farming produce and textiles, a new study suggests.

The researchers looked at cylinder seals that date to 4400 to 3400 B.C.E., with an emphasis on those used before the development of writing. When they compared symbols on the cylinder seals with ...

Ancient Origins of Writing Traced to Mysterious 6,000-Year-Old Symbols Comparison of the 'fringed cloth' motif and proto-cuneiform signs. ( Kelley et al., Antiquity , 2024 ) ...

Chemical reactions can be summarised using symbol equations. Learn more in this KS3 Chemistry guide from Bitesize.