Chapter 4.2 Matter and its Changes

Which is a physical change?

• burning wood

• melting ice

• rusting iron

• spoiling food

Which characteristic is a chemical property?

• highly flammable

• mass of 15 kg

• woolly texture

• golden color

Which is a physical change?

• burning natural gas

• chopping onions

• digesting food

• exploding dynamite

Which is a chemical change?

• boiling water

• copper turning green in air

• freezing fruit juice

• slicing a potato

Which would be most useful for identifying an

unknown liquid?

• density

• mass

• volume

• weight

What causes a chemical reaction when you

prepare scrambled eggs?

• removing the eggs from the shells

• mixing the egg yolks and the egg whites

• heating the eggs in a pan

• sprinkling pepper onto the cooked eggs

Which describes the formation of a precipitate?

• A gas forms when a solid is placed in a

  liquid.

• A liquid forms when a block of metal is

  heated.

• A solid forms when one liquid is poured

  into another.

• Bubbles form when an acid is poured

  onto a rock.

Which diagram shows a chemical change?

• 
• 
• 
• 

Which is NOT true about firewood that burns

completely?

• Ashes and gases form from the substances in the wood.

• Oxygen from the air combines with substances in the wood.

• The total mass of substances in this process decreases.

• The wood gives off thermal energy and light.

Which is true when an ice cube melts?

• Volume and mass increase.

• Volume and mass do not change.

• Volume decreases, but mass does not

  change.

• Volume increases, but mass decreases.