A wooden block is lifted out of a square box and set down inside a round bowl. What happens to the shape of the block?

Juice is poured from a tall, narrow glass into a wide, shallow dish. What happens to the juice in the dish?

A teacher opens a bottle of scented cleaner in one corner of the classroom. A few minutes later, students on the far side can smell it. What does this show about a gas?

An ice cube is left on a plate in a warm room, and soon there is a small puddle of water on the plate. What change of state happened, and why?

A tray of liquid water is placed in a freezer, and by morning it has become solid ice. What had to happen to the water for it to freeze?

After a rain shower, a puddle on the sunny sidewalk gets smaller each hour until the sidewalk is dry. What change of state happened to the water, and why?

On a warm day, drops of water form on the outside of a glass of ice water. What change of state made those drops, and why?

The sky stayed clear all night with no rain, yet early in the morning tiny drops of water sit on the cool grass. What change of state formed those drops, and why?

A cook melts butter in a warm pan, then pours it into a cup and puts the cup in the refrigerator, where the butter becomes solid again. What does this show?

When an ice cube melts, the liquid it turns into is still water.

Liquid wax runs down the side of a burning candle and hardens into a lump on the cool table below. What change of state made the wax hard again, and why?

Two puddles of the same size sit on a sidewalk. One is in bright sunlight and one is in the shade of a wall. Which puddle dries up first, and why?

Water is heated in a pot on a stove. A cool lid is held above the pot, and drops of water collect on the underside of the lid. Which two changes of state happened?

During a very cold night, heat leaves the water at the top of a pond and a solid sheet of ice forms across it. This change of state is called ___.

Which state of matter usually keeps its own shape and volume?

Which state of matter has a definite volume but takes the shape of its container?

Which state of matter spreads out to fill all the space in its container?

What is the change from a solid to a liquid called?

What is the change from a liquid to a solid called?

What is the change from a liquid to a gas at the surface of the liquid called?

What is the change from a gas to a liquid called?

When water boils in a pot, liquid water changes mostly into what?

An ice cube melting is a physical change.

Air can be squeezed into a smaller space, like when air is pumped into a bike tire.

Air is an example of a gas.

Which object is the best example of a solid?

Which example is a liquid?

Which example is a gas?

Two equal amounts of ice sit in the same warm room. One is a single big ice cube. The other is crushed into many small pieces. Which melts first, and why?

A tray of water is placed in a freezer. At about what temperature does the water start to freeze into ice?

On a warm, sunny day, a puddle on the sidewalk slowly disappears. The water never bubbles or boils. What does this show?

Tiny drops of water form on a cold window. The water came from the air, but no one could see any water in the air before the drops formed. Why not?

A chocolate bar melts into a puddle after being left in a hot car, then it hardens again after a few hours in the refrigerator. What is true about the chocolate?

A cook pours 1 cup of vegetable oil from a bottle into a bowl. Then she pours all of it into a wide, flat pan, where it looks much flatter. How much oil is in the pan?

Bricks like the ones in this wall are ground up into a pile of tiny red grains, like sand. The grains can be poured into a cup and take the cup's shape. What state of matter is each tiny grain?

A scoop of ice cream is left in a bowl on the kitchen counter. After twenty minutes it has turned into a soft, runny puddle. What happened to cause this change?

A metal ladder is left outside during freezing rain. By morning it is coated with a layer of solid ice. What change of state formed the ice, and why?

A small puddle of nail polish remover is left open in a room. Within an hour it is gone, and the whole room smells like it. What change of state happened to the nail polish remover, and why?

What happens to the amount of water when it freezes into ice in a closed container?

Which word describes water as a solid?