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===About Harmful Chemicals===
: [[Harmful]] [[chemical]]s can make an [[organism]] ill but will not kill the [[organism]].
: Some [[harmful]] [[chemical]]s must be [[ingest]]ed to cause harm, but others may cause harm in contact with the [[skin]] or [[eye]]s.
==Key Stage 4==
===Meaning===
A [[harmful]] [[chemical]] is one that can cause damage to an [[organism]].
===About Harmful Chemicals===
: [[Harmful]] [[chemical]]s can make an [[organism]] ill but will not kill the [[organism]].
: Some [[harmful]] [[chemical]]s must be [[ingest]]ed to cause harm, but others may cause harm in contact with the [[skin]] or [[eye]]s.