chemical
Yes, blowing up a balloon and letting the air out are physical changes. In both cases, the balloon's shape and size are altered, but its chemical composition remains the same.
Letting a slice of tomato rot is primarily a chemical change rather than a physical change. During the rotting process, the organic compounds in the tomato undergo decomposition due to microbial activity, resulting in new substances and changes in texture, color, and smell. While the physical appearance of the tomato changes, the underlying chemical composition is altered, making it a chemical transformation.
Letting tap water sit out may reduce the chlorine content as it evaporates, but it will not significantly affect the mineral content. Minerals in water do not evaporate like volatile compounds such as chlorine.
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.
Letting a copper kettle tarnish is a chemical change because it involves a reaction between the surface of the copper and elements in the air, like oxygen and sulfur compounds, forming new compounds like copper oxide or copper sulfide on the surface. This chemical reaction alters the composition of the copper material, leading to a permanent change in its appearance.
No. Sodium chloride in water dissolves into its individual Na+ ions and Cl- ions due to the polarity of the water molecule. This is not a bonding between water and sodium chloride. In fact there is no chemical reaction at all taking place. The dissolving of the sodium and chloride ions by water is a physical change, and can be reversed by letting the water evaporate.
Yes, blowing up a balloon and letting the air out are physical changes. In both cases, the balloon's shape and size are altered, but its chemical composition remains the same.
Letting a slice of tomato rot is primarily a chemical change rather than a physical change. During the rotting process, the organic compounds in the tomato undergo decomposition due to microbial activity, resulting in new substances and changes in texture, color, and smell. While the physical appearance of the tomato changes, the underlying chemical composition is altered, making it a chemical transformation.
Some physical change recipes you can try are making homemade ice cream by mixing cream, sugar, and vanilla extract and then freezing the mixture, or making Jell-O by dissolving Jell-O powder in hot water and letting it set in the refrigerator. These recipes involve physical changes like freezing and solidifying without any chemical reactions occurring.
Tis cycle is melting to a liquid-------evaporation to a gas.
Letting tap water sit out may reduce the chlorine content as it evaporates, but it will not significantly affect the mineral content. Minerals in water do not evaporate like volatile compounds such as chlorine.
You obtain salt water by letting the sea water evaporate.
It depends on whether it was dissolved in water or just crushed up. If it was dissolved in water, it should re-crystalize as the water evaporates. If it was crushed up, aside from dissolving it in water and waiting for it to evaporate off, or melting it in a glass pipe and letting it recrystalize, there's no other way that I can think of to return it to its rock form.
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.
I am quite sure that rust is a chemical change. Rust is caused when oxygen atoms begin bonding with the iron in the nail, which makes it a compound instead of a pure element.
Salt can be mined in three ways. It is either mined in the normal manner, via drilling and blasting, or solution mined via injection and pumping out of hot water, or by evaporation, wherein sea water is pumped into shallow ponds and letting it evaporate.
One way in which it can be separated is by letting the water evaporate, leaving the copper chloride behind.