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katrin [286]
3 years ago
15

How are physical andchemical changes different?​

Chemistry
1 answer:
astra-53 [7]3 years ago
5 0
Physical changes happen when you do/mix something that can be reversed. Best example is ripping a paper, you can just tape it back together so it is just an observable thing that changes, which is a physical change. Chemical changes happen when you mix things and they make a new substance and can’t be reversed. The best example of this is the Statue of Liberty, which changed in color due to the chemical change between the oxygen and copper, which created a new substance (rust) which made it green instead of copper.
Sorry for the long answer but hope this helps!
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What group represents the alkaline, alkali, halogens, noble gases, and transition metals elements?
motikmotik
Alkaline metal-group 1
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Which characteristic of the elements increases as you move across a period from left to right?
topjm [15]

Answer:

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In a period, the number of valence electrons increases (mostly for light metal/elements) as we move from left to right side

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If the ph of a solution is 6.1 what is the concentration of h+ ions in the solution
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Explanation:

Comparing to the solution consisting a pH of 5 containing 10^{-5}  \frac{mol}{L} of hydrogen ions, a solution having a pH of 6 consists of 10^{-6}  \frac{mol}{L} of hydrogen ions. A solution having a pH of 7 too will have a pH of 10^{-7}  \frac{mol}{L}.

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2 years ago
If you leave a cup of hot chocolate sitting on a table what eventually happens to the temperature? Does the temperature ever rea
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Well , heat flows from an area of high temperature to an area of low temperature. Here , hot chocolate has the high temp , and the surrounding has a room temp. So , the heat from the hot chocolate will dissipate into the surroundings and create a thermal equilibrium. So youre right.

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