Plastic is used to cover the copper wires in the power cords of appliances because plastic differs from copper in that? 1. It is less dense
2. It is used to close the circuit
3. It is in a different phase at room temperature
4. It is not a conductor

Why is permeable soil best for plants that need a lot of drainage?

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.

State one important difference between a physical change and a chemical change?