Copper(Il) oxide catalyses the decomposition of aqueous hydrogen peroxide to produce oxygen and water. In a laboratory experiment, aqueous hydrogen peroxide is shaken with

copper(Il) oxide in a test tube.

What is observed in the test tube after the reaction is completed?​

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

This is the substance(s) formed in a chemical reaction.

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.