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Is boiling gold a physical change?
Melting of gold for jewellery making is a physical change as no new substance is formed after melting. Changes in state or phase are physical changes.
Is pouring molten gold into a mold a physical change?
Yes. Gold would have to bond with something for it to be a chemical change.
Is Pouring molten gold in a mold a physical or chemical change?
Pouring molten gold in a mold is a physical change because it involves a change in state from liquid to solid without altering the chemical composition of the gold.
A piece of solid gold that changes from a solid to a liquid is a physical or chemical change?
The change from solid gold to liquid gold is a physical change because it does not alter the chemical composition of the gold. The transition from solid to liquid is a result of a change in temperature and does not involve any chemical reactions.
Is forming a bar of gold into wire a physical change or a chemical change?
Still a physical change because its still gold and weren't doing anything like making a new element or mixing chemicals with the gold. So its still a physical change.
How did California's gold rush change the state so significantly?
It received a massive influx of immigrants.
How did the city of California change after gold was found?
There is no " city of California". We have a state of CA with many cities.
When gold is melted does it weigh less?
No, when gold is melted it does not weigh less. Its mass remains the same, but its volume may change depending on its state (solid or liquid).
When Small gold flakes are removed from a water solution by filtering the solution Is this a physical change?
This shouldn't be a physical change as, the gold isn't being turned from it's liquid form to it's solid form. When we filter the water for gold flakes, we are essentially taking small amounts of gold from the water and collecting them together to form a larger and more apparent amount. No state change (ie, liquid to gas. Gas to liquid. Liquid to solid.) is taking place during the process.
What happens to the mass of gold when a jeweler melts the gold to make jewelry?
When a jeweler melts gold to make jewelry, the mass of the gold remains the same. This is due to the law of conservation of mass, which states that mass is neither created nor destroyed during a chemical reaction or change in state. The gold simply changes from a solid to a liquid state.
Is melting gold and pouring it into a molt a chemical change?
No it's not because all you are doing is melting the gold, putting in into a mold and letting it harden. It would be a chemical change if you added some other substance to it during the progress.
When small gold flakes are removed from a water solution by filtering the solution is this a chemical change?
No, this process of removing gold flakes by filtering them out is a physical change, not a chemical change. This is because the gold flakes are still the same substance before and after filtering; only their physical state has been altered.
