Which sample is a pure substance? zinc oxide
sugar dissolved in water
pond water
soil

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring