We're being asked to choose the pure substance from the list.
Recall that Matter can be categorized as a single or variable composition.
• Matter is considered a pure substance if it is composed of a single entity. Pure substances can be further categorized into two:
▪ Element → cannot be separated into simpler substances or composed of only 1 type of atom (eg. O3, Cl2)
▪ Compound → can be separated into simpler substances
• Matter is considered a mixture if they have variable composition. Mixtures are not chemically combined. Mixtures can be further categorized into two:
Choose the pure substance from the list below.
A. sea water
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What scientific concept do you need to know in order to solve this problem?
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