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I would test each liquid by putting a penny in it and seeing how it would react.

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For the first question it is called a physical change beacuase it didn't make something new but it's appearance changed.  For the second question what happened was its rusting

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Rust it's called rust, what caused this was water.

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When metal changes its appearance like this it is called "rust." This is called physical change. I think humidity caused this as well as if the nails were sitting out in the rain and then the sun dried it up.

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It is rust

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It's called rust and it happens when steel is exposed to rain for a long period of time.

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What happens was that the metal rusted and this was caused by rain water

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It is called rust..... —— it happens when the silver and steel oxides making it rust.... That's what I think happened

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The physical change that happened in the picture is called rust. This happened because humidity in the air.

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It is called rust.
It was caused by aging over being used in projects or was caused by getting wet and damp.

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It's called a chemical change because the chemistry inside the nail changed to get the rust color. The metal rusted by coming in contact to water.

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When metal changes its apperance like this it's called chemical change.
I think that water made the rust happen?!!?

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When metal changes appearance, it is called a chemical change. Rust made the appearance of the metal change, and it is caused by coming in contact with water.