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Why heating copper wire in the presence of air at high temperature a chemical change Why?
Heating copper wire in the presence of air at high temperatures causes a chemical change because it leads to the oxidation of copper. When exposed to oxygen, copper reacts to form copper oxide, resulting in a new substance with different properties. This transformation involves a rearrangement of atoms and bonds, characteristic of a chemical change, as opposed to a physical change where the substance remains the same.
What is the result of combining copper and sulfur?
When copper and sulfur are combined, they form copper sulfide, which is a dark grey or black compound. This chemical reaction is often used in educational demonstrations to showcase the formation of a new substance through a chemical change.
By heating green copper carbonate so that it changes to black copper oxide will this be a chamical or physical change?
The change from green copper carbonate to black copper oxide is a chemical change because it involves a chemical reaction where the chemical composition of the substance is altered. The color change indicates a new substance has formed, making it a chemical change.
Is heating copper sulfate crystals a chemical change?
Heating copper sulfate crystals is a physical change because it only involves a change in state from solid to liquid or gas, without altering the chemical composition of the substance. Chemical changes involve the rearrangement of atoms to form new substances with different properties.
Is copper sulphate a physical change or chemical?
Copper sulfate dissolving in water is a physical change as no new substance is formed. However, if copper sulfate is heated to decomposition, it would be a chemical change because a new substance is formed.
Was there a new substance formed after heating the iron-sulfur mixture?
yes.
Was there a new substance formed after heating the iron sulfur mixture?
Yes, a new substance, iron sulfide, was formed after heating the iron-sulfur mixture. Iron sulfide is a chemical compound that results from the combination of iron and sulfur atoms during the heating process.
Why does copper sulphate turn blue when water is added?
The copper sulfate reacts with the water, creating a new substance with a different color.
The expansion of matter upon heating is an example of what change?
The expansion of matter upon heating is an example of a physical change. This is because the substance undergoes a change in form or appearance without forming a new substance.
What happens to a substance that break apart before it can melt?
This is a thermal decomposition reaction: new compounds are obtained by heating.
Is a copper penny turning dark a chemical change or physical change?
Chemical.
Could you say a new substance was form after copper and sulfur were ground?
Hint: Try writing a chemical equation
