Changing Properties of Matter (4.P 9.1)

A piece of iron chain is left in water for a few days and changes color from gray to reddish-brown. This is most likely an example of which of the following?

• Melting

• Bending

• Burning

• Rusting

Baking cookies requires several processes. Some of these processes change the ingredients into something new, with different characteristics. Which of the following steps for baking cookies results in this kind of change?

• Cracking eggs into a bowl

• Baking the cookies in an oven

• Measuring out a quantity of milk

• Stirring nuts into the other ingredients

A piece of wood is set on fire and allowed to burn. Which of the following changes could be expected in the wood?

• It would change color and texture.

• It would absorb moisture from the atmosphere.

• Its size would expand with the heat.

• Its mass would increase.

A dead plant turns brown and breaks down, finally becoming part of the soil. What process is the plant going through?

• Decaying

• Reproducing

• Growing

• Transpiring

If a bike is left outside in the rain, the metal parts might start to rust. Rust is a new substance that forms from the metal on the bicycle. Which of the following changes could be expected on the bike?

• It would become very hot.

• It would absorb moisture from the atmosphere.

• Its size would lose most of its mass.

• The metal will turn a red or brownish color.

A pile of gray, powdery ashes would most likely be the result of something that had gone through which kind of change?

• Freezing

• Rusting

• Melting

• Burning

Eric observes a candle burning. He sees that part of the wick turns black. Which of the following best explains the black color on the wick?

• Burning formed a new material

• Melting turned the wax into a liquid

• Heat makes the candle gain mass

• The wick rusts when exposed to air

Bacteria are a large group of unicellular microorganisms. Bacteria help in breaking down the organic material of dead organisms. Which of the following changes does this example represent?

• Growing

• Melting

• Decaying

• Rusting

A mixture of flour, eggs, milk, oil, and sugar can become a cake by going through what process?

• Being dissolved in water

• Being changed by heat

• Being cooled by ice

• Being blown by the wind

Adriana is watching paper burn in the fireplace. What kind of change will most likely happen to the paper?

• It will get heavier.

• It will become wet.

• It will become larger.

• It will turn to ash.