Which sample is a pure substance?

a test tube of zinc oxide

a container of zinc and oxygen

a flask of pond water

a jar of soil

What is a prediction of future weather conditions?

A wet towel is hanging on a clothesline in the sun. the towel dries. What is this process called?

What do Boron and germanium have in common

Both hydrogen sulfide and ammonia have strong, unpleasant odors. which gas had the higher effusion rate? if you opened a container of each gas in a corner of a large room, which odor would you detect first on the other side of the room?

Would a calcium ion (ca2+) and a chloride ion attract or repel each other?

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide