U 13 L3 : How Deos matter Change?

A beaker of water is placed on a hot plate. The picture on the left shows the beaker when bubbles first start forming in the water. The picture on the right shows the beaker 5 minutes later.

What happened during the 5 minutes?

• Water was changed into energy during a chemical change.

• Water was changed into a different state during a physical change.

• Water was changed into a different material during a physical change.

• Water was changed into a different material during a chemical change.

How does cutting a whole pumpkin pie into eight slices affect its mass?

• Cutting the pie increases its mass.

• Cutting the pie decreases its mass.

• Cutting the pie does not change its mass.

• Cutting the pie makes its mass equal to its volume.

The table lists some examples of chemical changes and physical changes.

Which example is in the wrong column?

• sharpening a pencil

• baking a loaf of bread

• pouring milk into a glass

• crumpling aluminum foil into a ball

Which of the following represents a physical change?

• 
• 
• 
• 

The states of matter differ in many ways, including shape and volume. The following three figures show the particles in a solid, a liquid, and a gas.

Which of the following correctly identifies the state of matter?

• 3: gas

• 2: solid

• 1: liquid

• 2: liquid

The graph shows the changes in state of water at sea level.

Based on the graph, which of the following is true?

• Liquid water boils at temperatures between 0 °C and 100 °C.

• Solid water melts, forming liquid water, at temperatures below 0 °C.

• Liquid water freezes, forming solid water, at temperatures greater than 0 °C. .

• Water vapor condenses into liquid water when temperatures drop below 100 °C

There are different characteristics for each of the states of matter. Which statement describes a difference between liquids and solids?

• Temperature can change a solid to a liquid, but it cannot change a liquid to a solid.

• Solids have a definite volume and liquids do not have a definite volume.

• The particles in a solid are much closer together than the particles in a liquid.

• Solids take on the shape of their containers and liquids maintain their own shapes.

A cup holds 125 grams of liquid water and 100 grams of ice. What is a reasonable mass for the water in the cup after the ice melts?

• 175 grams

• 215 grams

• 225 grams

• 230 grams

How does water change as it evaporates?

• Its mass and volume decrease.

• Its mass and volume increase.

• Its mass remains unchanged. Its volume increases.

• Its mass increases. Its volume remains unchanged.

Riley and Jill are studying what happens to matter when it changes state. They found this list of statements. Which of these statements is true?

• When matter changes state, its mass changes.

• When matter changes state, its mass remains the same.

• When matter changes state, its boiling point might also change.

• When matter changes state, the space between particles in the matter stays the same.