1. Which of the following describe a chemical change, and which a physical chang

Question

1.         Which of the following describe a chemical change, and which a physical change?

a)Sheep are sheared, and the wool is spun into yarn.

b)A cake is baked from a mixture of flour, baking powder, sugar, eggs, shortening, and milk.

c)Silkworms feed on mulberry leaves and produce silk.

2.         Classify the following as an element, compound, heterogeneous mixture, or            solution.

            a)         chicken noodle soup               d)         copper wire

            b)         ice                                            e)         hot coffee

            c)         saltwater                                  f)         Italian salad dressing

Explanation / Answer

the change which is irreversible is called chemical change.

the change which is reversible is called physical change.

1) a)Sheep are sheared, and the wool is spun into yarn. physical change

b)A cake is baked from a mixture of flour, baking powder, sugar, eggs, shortening, and milk.

c)Silkworms feed on mulberry leaves and produce silk.

chemical change

element made up of similar type of atoms = Copper wire

compound : made up of different type of atoms : ice ,

heterogenous mixture which can identify by naked eye : chicken noodle soup , italian salad dressing

solution : homogenous mixture of two or more components = salt water , hot coffee.

2)

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