Question

4. Which of these substances are elements, and which are compounds? Explain your answer. K O2 NaCl Al Ca CaCl2

Answer 1

Answer:

KO2, NaCl, CaCl2

Explanation:

Answer 2

Explanation:

KO2,NaCl and CaCl2 are the compounds

And

Al and Ca are elements....

becz elements are the smallest unit and cannot be broken further and compounds are the mixture of elements