Which material consists of only one kind of atom?

Which box represents a compound?

A vinegar sample contains water and acetic acid. How should it be classified?

What do pure diamond and pure graphite have in common?

What does each joined pair in the model represent?

Two samples of the same pure substance come from different places. What must be the same in both?

What is each water molecule made of?

An aluminum spoon rests on a table. What are its atoms doing?

How do air particles travel inside an inflated balloon?

Why can air in a capped syringe be squeezed into a smaller volume?

Why does liquid water take the shape of the cup into which it is poured?

Why does a solid usually keep its shape?

Each box contains the same gas. Using the motion arrows and their key, which box represents the highest temperature?

Temperature is most closely related to which property of a substance's particles?

Ana detects perfume several meters from where it was sprayed. Which process spreads the fragrance through still air?

Liza adds equal drops of ink to equal amounts of unstirred water. Where should the color generally become evenly distributed sooner?

Road joints allow heated concrete slabs to expand. What particle change explains the increase in a slab's size?

During melting, how does heat transfer between ice and its surroundings?

Which process is represented by the change between these particle models?

When water vapor forms liquid droplets in a developing typhoon, what happens to thermal energy?