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An iron nail rusts when left outdoors Why might the nail no longer be useful?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
A balloon is placed in a freezer. What is the evidence a physical change has occurred?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
An iron nail left ourdoors for a year undergoes a chemical change. What evidence would be visible? The nail would be:
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
Which of the following is an example of chemical change?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
Three chemicals are mixed together and the resulting mixture is a different color. What is this evidence of?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
An ice cube is left on a table for an hour. What evidence shows a physical change takes place?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
Which of the following is not a chemical change?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
How do you know when a chemical reaction has occurred?
rusty
rusting
it is now made of a softer substance
chemical change
has shrunk in size
It melts into water.
a new substance has formed
melting
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