Zinc oxide reacts with aluminum to produce Zinc and Aluminum Oxide. Write the balanced equation for this reaction

PLEASE HELPPP

The excretory system,need answers for all: )

Give one example of a pure (exact) number and of an estimated (measured) number.

Which of the following is not a characteristic of a hydrogen bond? 1. it is responsible for the unusual physical properties of water. 2. it is weaker than a covalent bond. 3. it is stronger than other dipole-dipole interactions. 4. it can occur when hydrogen is covalently bound to very electronegative elements liks f, cl, br and i.