Answer:
Copper is element number 29
4th row
11th column
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Sedimentary rocks are formed due to layers so the answer is A.
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Lead is heavier and more resistant. Plastic foam is light and can easily be broken
Oil consists of many B. Covalent bonds between the nonmetals of Carbon, hydrogen and oxygen.
Answer: Chemicals like acids and bases are harmful and must be neutralized before draining.
Explanation:
A strong acid or strong base is required to be diluted or neutralized before it is discarded in the drain as if is discarded without diluting and neutralization it can spill and splash from sink or drain and can harm people in chemistry lab, moreover the fumes of the discarded chemical on spilling can cause respiratory tract burning and can even cause fire hazard so it must be converted into less harmful form and then must be drained.