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Is it correct to say the chemical changes are not reversible but physical changes are?
Wiki User
∙ 8y ago
yes it is correct because chemical energy means you can't change something back like paper if you burned that paper you can't change it back but if you had that paper and you ripped it you can glue it back you can fix it that is physical energy when you can put something back together so yes you can say that.
Wiki User
∙ 8y ago
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Why dissolution of NaCl in water is a physical change not a chemical change?
It has been argued whether this is a chemical or physical change. It can be viewed as a chemical change since the Na ion and Cl ion are separated from the crystal lattice, and then become hydrated by water molecules, thus changing the actual chemical structure. However, this is a REVERSIBLE chemical change. Thus, if you evaporate the water, you end up with the same crystalline structure (lattice) that you began with, and so it may now be viewed as simply a physical change. There is no consensus as to which is correct, IMHO.
What does physical and chemical change have in common?
A physical change to an object is a change in properties not involving the chemical makeup. In other words, a physical change is any change you can make to an object without changing the actual substance. (I.e. state of matter, size, shape, color . . .etc.) A chemical change is a change that forms a new substance through a chemical reaction. A chemical reaction is often signaled by bubbling or fizzing, but the only real way to prove a chemical reaction is by coming up with a new substance. So physical changes leave you with the same substance (slightly altered in appearance/texture etc.), but chemical reactions give you a new substance.
If you chop wood for a fire and then burn the wood you have made both physical and chemical changes.?
Yes, chopping is a physical change: the chemical composition of the molecules inside the wood remains the same. Burning causes the molecules in the wood to react with the air (mostly with the oxygen in the air), and the result is different compounds than before.
Is breaking an egg an example of a physical or a chemical change?
That's correct. Breaking an egge doesn't alter the chemistry of the egg, it just 'breaks' the shell. With a little imagination you could even be able to restore the egg, which isn't possible with a chemical change (such as boiling the egg).
What is the correct chemical formula for sulfuric acid solution include physical state?
H2SO4 (aqueous), it exists at H+ and HSO4-
Is making jam a chemical change?
Yes, because several chemical reactions can occur.
Do chemical changes produce gas?
Yes, it is correct.
Is making juce is physical changes?
Yes, it is correct.
Why dissolution of NaCl in water is a physical change not a chemical change?
It has been argued whether this is a chemical or physical change. It can be viewed as a chemical change since the Na ion and Cl ion are separated from the crystal lattice, and then become hydrated by water molecules, thus changing the actual chemical structure. However, this is a REVERSIBLE chemical change. Thus, if you evaporate the water, you end up with the same crystalline structure (lattice) that you began with, and so it may now be viewed as simply a physical change. There is no consensus as to which is correct, IMHO.
What does physical and chemical change have in common?
A physical change to an object is a change in properties not involving the chemical makeup. In other words, a physical change is any change you can make to an object without changing the actual substance. (I.e. state of matter, size, shape, color . . .etc.) A chemical change is a change that forms a new substance through a chemical reaction. A chemical reaction is often signaled by bubbling or fizzing, but the only real way to prove a chemical reaction is by coming up with a new substance. So physical changes leave you with the same substance (slightly altered in appearance/texture etc.), but chemical reactions give you a new substance.
Is cleaning a penny with vinegar and salt a physical or chemical change?
It is a chemical reaction and this is the correct way to spell penny!
Is it correct to say that chemical changes are not reverisble but phycial changes are?
No, chemical reactions can be reversed. For example: 2H2O -> 2H2 + O2 can change back, 2H2 + O2 -> 2H2O
If you chop wood for a fire and then burn the wood you have made both physical and chemical changes.?
Yes, chopping is a physical change: the chemical composition of the molecules inside the wood remains the same. Burning causes the molecules in the wood to react with the air (mostly with the oxygen in the air), and the result is different compounds than before.
While physical weathering will break a rock into chunks what turns the rock into soil?
chemical weathering
Is it true that a spontaneous process is a physical or chemical change that occurs with no outside interventions?
That is correct.
How are chemical properties of matter characterized?
Correct characterization of matter chemical properties is possible by experimental studies; but theoretical methods exist for the approximate calculation the values for some chemical and physical properties.
Is the reactivity of copper with oxygen considered a chemical or physical property?
The correct spelling is "reaction of copper with...' 1. Chemical reactivity is a chemical property. 2. A chemical reaction involve a chemical change.
