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Sergio [31]
3 years ago
10

Write 2 difference between physical and chemical change. write an example in which both take place​

Chemistry
2 answers:
OlgaM077 [116]3 years ago
8 0

Hey! Friend..

Chemical change is permanent change whereas physical change is temporary change in which only physical state of same matter is changed without affecting its chemical composition. So, physical change can be reversed to its original state.

e.g. water changing in vapour which again can condense to form water, is physical change whereas burning of woods to form ashes is a chemical change, as we can't reverse it to form wood again.

Hope u like the answer....

jeka57 [31]3 years ago
5 0

Answer:

1) A Physical change doesn't change the chemical composition of a substance while a chemical change does.

2) Physical changes are reversible, Chemical changes are not

Examples:

Physical: Melting ice to liquid water

Chemical: Burning up paper

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B. Quarks is the answer.
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nswer the following questions relating to HCl, CH3Cl, and CH3Br.HCl(g), can be prepared by the reaction of concentrated H2SO4(ag
alexdok [17]

Answer:

It is an example of double displacement reaction.

4.8 g of NaCl is needed to react.

Explanation:

Balanced reaction: H_{2}SO_{4}(aq.)+2NaCl(s)\rightarrow 2HCl(g)+Na_{2}SO_{4}(aq.)

Here, oxidation states of H, S, O, Na and Cl do not change during reaction. Hence it is not a redox reaction.

In this reaction, cations and anions of the reactants interchange their partners during reaction. Hence, it is an example of double displacement reaction.

As H_{2}SO_{4}(aq.) remain in excess amount therefore NaCl (s) is the limiting reagent. Hence production of HCl entirely depends on amount of NaCl used.

Molar mass of HCl = 36.46 g/mol

So, 3.0 g of HCl = \frac{3.0}{36.46} mol of HCl = 0.082 mol of HCl

According to balanced equation-

2 moles of HCl are produced from 2 moles of NaCl

So, 0.082 moles of HCl are produced from 0.082 moles of NaCl

Molar mass of NaCl = 58.44 g/mol

So, mass of 0.082 moles of NaCl = (0.082\times 58.44) g = 4.8 g

Hence 4.8 g of NaCl is needed to react.

4 0
3 years ago
What approximate percentage of the Earth’s freshwater is groundwater?
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the answer is c.) 30%

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If the mass of a material is 104 grams and the volume of the material is 21 cm3, what would the density of the material be?
WITCHER [35]
Remembering that
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3 years ago
Lighting a match changes ch and energy into heat.​
otez555 [7]

Answer:

The answer remains the same. The total amount of energy stays the same because the 1st Law of Thermodynamics states that energy can neither be created nor destroyed, it can only change forms. So the chemical energy is just being converted into heat and light.

Explanation:

hope this helps...

7 0
2 years ago
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