Is melting a piece of wax a physical or chemcial change

Which element is a halogen and has a larger average atomic mass than arsenic (As) ?

Which mixture contains visible particles that settle out unless the mixture is stirred yahoo?

A graduated cylinder contains 20.5 mL of water. What is the new water level after 35.2 g of silver metal with a density of 10.5 g/mL is submerged in water?

Human fat has a density of 0.918 g/cm^3. How much volume (in cm^3) is gained by a person who gains 10.1 lbs of pure fat?

If you kick a ball and the ball does not move then the forces involved must be

How is the ocean important to human survival? restate the question

A sample of pure lithium contains 7.99% lithium by mass. What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?

What ecosystem is being described in the passage?

In the enzyme reaction above, catechol is the substrate, oxygen is a reactant, catechol oxidase is the enzyme, benzoquinone is the product, and water (H2O) is a by-product. Which of the following will decrease the rate of this reaction? a.

How do acids and bases affect the quality of freshwater sources?