What do scientists call a substance that is made of two or more elements?

What is a pure lump of elemental gold made of?

Which of the following is the best model for molecules in a gas?

Early chemists thought the parts of the atom were spread evenly throughout the atom. How has the model changed? We now know

An understanding of the structure of an atom has been developed. How much time did it take to do?

What happens to molecules of a liquid when it turns to gas? The molecules have:

An increase in temperature of a liquid causes it to change to which phase?

A decrease in the temperature of a gas would cause a change to which of the following phases first?

Students placed a balloon with air in the freezer for several hours. What will they observe when they take the balloon out?

Sidewalks have cracks that are imprinted every meter or two. What is the purpose of these cracks?

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