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Chemical
Chemical
Chemical
If something reacts with water to form a gas, it's demonstrating a chemical property. The reaction has caused it to become something new, which is a telltale sign of a chemical property.
When copper reacts with alcohol, it forms copper acetate and hydrogen gas. This reaction is a chemical process where the copper atoms combine with the alcohol molecules to create a new compound.
Strontium reacts with water producing strontium hydroxide and hydrogen gas. This is a chemical change.
The chemical reaction is:2 HI + Br2 = 2 HBr + I2
chemical
Chemical because if the reaction is production of gas, then it's a chemical.
When zinc reacts with acids to produce hydrogen gas, it is a chemical change because new substances are formed (zinc salts and hydrogen gas) with different properties from the original substances.
An oxide is formed.
Physical