classify each of the following pure substances as either an element or a compound: water aluminum lead
classify each of the following pure substances as either an element or a compound: water aluminum lead
Answer
Explanation:
Step1: Recall definitions
An element is a pure - substance made of only one type of atom. A compound is a pure - substance made of two or more different types of atoms chemically combined.
Step2: Analyze water
Water has the chemical formula $H_2O$. It is made of hydrogen and oxygen atoms chemically combined, so it is a compound.
Step3: Analyze aluminum
Aluminum is represented by the symbol Al. It is made of only aluminum atoms, so it is an element.
Step4: Analyze lead
Lead is represented by the symbol Pb. It is made of only lead atoms, so it is an element.
Answer:
water: compound aluminum: element lead: element