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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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A bar of gold is 5.0mm thick, 10.0cm long and 2.0cm wide. It has a mass of exactly 193.0g. What is the desity of gold?
Tanzania [10]
<h3>Answer:</h3>

19.3 g/cm³

<h3>Explanation:</h3>

Density of a substance refers to the mass of the substance per unit volume.

Therefore, Density = Mass ÷ Volume

In this case, we are given;

Mass of the gold bar = 193.0 g

Dimensions of the Gold bar = 5.00 mm by 10.0 cm by 2.0 cm

We are required to get the density of the gold bar

Step 1: Volume of the gold bar

Volume is given by, Length × width × height

Volume =  0.50 cm × 10.0 cm × 2.0 cm

             = 10 cm³

Step 2: Density of the gold bar

Density = Mass ÷ volume

Density of the gold bar = 193.0 g ÷ 10 cm³

                                      = 19.3 g/cm³

Thus, the density of the gold bar is 19.3 g/cm³

3 0
3 years ago
Can somebody help me ​
Anastaziya [24]
It would be:
2H2 + O2 -> 2H2O


5 0
3 years ago
T or F? The force of attraction between a positive and negative electric charge decreases quickly as the distance between them i
agasfer [191]
False, The attraction would get stronger.
4 0
2 years ago
What is the abbreviation for the element with atomic number 11?
VikaD [51]

Answer:

Sodium (Na) has atomic number 11.

5 0
3 years ago
Read 2 more answers
If 49.0 g of O2 is mixed with 49.0 g of H2 and the mixture is ignited, what is the maximum mass of water that may be produced?
Katarina [22]

Answer:

55.2gH_2O

Explanation:

Hello!

In this case, since the reaction between hydrogen and oxygen to produce water is:

2H_2+O_2\rightarrow 2H_2O

When equal masses of each reactant go in contact to carry out the reaction, we can identify the maximum mass of yielded water as the fewest mass yielded by each reactant, just as shown below:

m_{water}^{by\ H_2}=49.0gH_2*\frac{1molH_2}{2.02gH_2}*\frac{2molH_2O}{2molH_2}*\frac{18.02gH_2O}{1molH_2O}   =170gH_2O\\\\m_{water}^{by\ O_2}=49.0gO_2*\frac{1molO_2}{32.0gO_2}*\frac{2molH_2O}{1molO_2}*\frac{18.02gH_2O}{1molH_2O}   =55.2gH_2O

Thus, since hydrogen yields more water than real, we limit the maximum mass of water to those 55.2 g yielded by oxygen as hydrogen would be in excess.

Best regards!

4 0
3 years ago
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