Question

directions: use the information in the two - passages physical changes and chemical changes to answer the following questions.

1. according to the information in the passages, what type of change made to matter is permanent?

a physical changes
b chemical changes
c liquid changes
d scientific changes

1. using information from both passages, which of the following examples describes a chemical change to wood?

a chopping wood into smaller logs
b planting new trees
c burning wood in a fireplace
d a bird using twigs to build a nest in a tree

1. how are physical changes and chemical changes alike?

a both changes are irreversible.
b both changes are not permanent and can be undone.
c both changes are only performed by scientists.
d both changes happen to things made of matter.

1. why did the author most likely choose to use photographs of butter in the passage physical changes?

a the author wanted to show readers how to cook with butter on the stove.
b the author wanted to show the reader how butter can go through a chemical change.
c the author used the photographs to show how the butter goes through a physical change but is still butter even when it is melted.
d the author used the photographs to show readers how to safely cook with butter and not be burned.

1. using the information in the table, what is a clue that helps people know biscuit dough goes through a chemical change?

a the color changes.
b there is light created.
c the dough produces heat.
d a new matter is created.

Explanation:

1. Chemical changes are permanent changes to matter. Physical changes are not permanent. So, chemical changes make changes to matter permanent.
2. Burning wood is a chemical change as it forms new substances (ash, carbon - dioxide etc.). Chopping wood is a physical change. Planting new trees and a bird building a nest are not chemical changes to wood.
3. Both physical and chemical changes occur to matter. Physical changes are usually reversible and chemical changes are usually irreversible. They are not only performed by scientists and not all physical changes are non - permanent.
4. Melting butter is a physical change as the butter changes state but is still butter chemically. The author likely used photographs to show this physical change.
5. A chemical change creates a new matter. Color change, light creation, and heat production can also occur in physical changes sometimes, but the creation of new matter is a key indicator of a chemical change.

Answer:

1. b
2. c
3. d
4. c
5. d