Yes
Breaking of glass is a physical change. It does not change the chemical makeup of the glass, and it can be reversed by melting the glass and re-blowing it.
Yes, it wouldn't be a chemical change because that is when you change the properties of a substance, and you can take the pennies out of the water so theres no real difference done.
No, because the original substances were not changed.
physical! STUPID
Anything else then dropping it in molten gold is chemical
physical reaction
Chemical.
A physical change is when some thing's shape or volume is changed. But a chemical change is a reaction between two or more objects to create something new and you can't get back what you originally started with.
Its a physical property, because if I melt a penny it goes from solid to liquid but its still a penny. It doesn't turn into a quarter oh and good luck with your test or homework
Physical change
Anything else then dropping it in molten gold is chemical
Chemical
physical reaction
Chemical.
this is my homework just give the answer already!
It is a chemical reaction and this is the correct way to spell penny!
It is a physical change, because it does not change in substance. A penny, whether in its normal state or flattened, is still a penny. Similarly, if you drop a watermelon and it breaks apart, that is also considered to be a physical change because it is still a watermelon. Things are considered to be chemical changes when the substance changes into something new, and is commonly classified as irreversible. When an object rusts, it is considered to be a chemical change. Chemical changes are associated with a temperature change, or a color change or bubbling or something of the sort. Physical changes deal with physical changes in state, for example, ice melting, or in the example you provided, a penny being flattened.
Any medium-strong acidic or alkaline will clean a penny. --- I don't know all of them, but a common one is mixing baking soda and vinegar and dropping the penny into the mixture during the reaction between the acid and the base. Thanks. -Psymonkey21 ---- Alternatively, dropping it into a small glass of coca-cola will do the trink (you will have to leave it for a while. The same is true with vinegar, and lemon juice. ManUtd77 -------------
Sugar reaches the copper and they form a physical change
sit the glass of water on the penny
no