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Chemistry Describing Matter and Physical and Chemical Changes. Which activity is an example of a chemical change?. sugar dissolving in water water evaporating in air lighting a match freezing water.

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which activity is an example of a chemical change
Which activity is an example of a chemical change?
  • sugar dissolving in water
  • water evaporating in air
  • lighting a match
  • freezing water
slide3
Diamonds are sometimes used as the tips of drill bits. Which physical property of a diamond MOST likely makes it a good cutting tool?
  • its electrical properties
  • its thermal properties
  • its hardness
  • its density
which is an example of a chemical change
Which is an example of a chemical change?
  • heating a block of ice to form liquid water
  • heating a tungsten wire until it glows brightly
  • adding sugar crystals to water to form a clear, colorless liquid
  • passing an electric current through water to form hydrogen and oxygen
slide5
The diagram shows a tank of fluid with an ice cube at the bottom.Which best explains why the ice cube sank in the liquid?
  • The ice cube is in water.
  • The liquid is less dense than the ice.
  • The liquid is more dense than the ice.
  • The ice cube is colder than the liquid.
which of these is a chemical property of a material
Which of these is a chemical property of a material?
  • density
  • flammability
  • color
  • brittleness
slide7

Students added a small rock to a graduated cylinder with 16 mL of water. The water level rose 6 mL.The student subtracted the two water levels. Which property of the rock were the students measuring?

  • density
  • area
  • mass
  • volume
slide8

John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and salt was visible at the bottom of the jar. This in an example of a

  • physical change.
  • chemical change.
  • solute being dissolved.
  • new substance being formed.
slide9
The light and dark circles in the pictures below represent different types of atoms. Which picture best represents a pure compound?

1.

2.

  • [IMAGE]
  • [IMAGE]
  • [IMAGE]
  • [IMAGE]

3.

4.