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2 years ago

What is an example of chemical change

Chemistry

2 answers:

Helga [31]2 years ago

4 0

metal rusting in salt water

hammer [34]2 years ago

4 0

Answer:

Metal corroding in salt water.

Explanation:

Chemical reaction may be defined as the process of chemical transformation of one type of chemical substance into the another type of substance. Chemical reaction is a type of irreversible reaction.

Corrosion is an example of chemical reaction. The metals get completely destroyed and a layer of rust (chemical substance) is deposited over the metal. The sat water enhances the process of metal corroding. The new iron compound is produced during the process of metal corrosion in salt water.

Thus, the correct answer is option (3).

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One isotope of a metallic element has the mass number 67 and 37 neutrons in the nucleus. The cation derived from the isotope has

Anuta_ua [19.1K]

No. Of protons = mass no. - no. Of neutrons
No. Of protons = 67 - 37
= 30
No. Of electrons = 28

Zinc will have 30 protons and 28 electrons. So, it will have +2 charge

Symbol - Zn^+2

6 0

2 years ago

Read 2 more answers

Why is it not correct/precise to say "a molecule of salt?"

Fynjy0 [20]

It is not correct to say " a molecule of salt " because salt is a compound.

Explanation:

As we know a molecular bond is present in each molecule.
Salt (NaCl) is considered as a compound because it is made up of two types of elements that are sodium as well as chlorine.
On the other hand it is not considered as a molecule as it is not holding an ionic bond.
As a result we can name it as an ionic compound. Hence it is not considered as a molecule of salt.

4 0

2 years ago

Question 1 of 30

Ksivusya [100]

The answer will be A

3 0

2 years ago

Read 2 more answers

train travel from hong kong to beijing it traveled at an average speed of 160 km/m in the first 4 hours. after that it traveled

Nonamiya [84]

Answer:

7 hours

Explanation: step 1. 160x4=640

step 2. 1180-640=540

step 3. 540÷180=3

step 4. 3+4=7

5 0

2 years ago

Read 2 more answers

If the molecule could move upward without colliding with other molecules, then how high would it go before coming to rest? Give

tankabanditka [31]

The maximum height at which nitrogen molecule will go before coming to rest is 14 kilometers.

Given:

The nitrogen gas molecule with a temperature of 330 Kelvins is released from Earth's surface to travel upward.

To find:

The maximum height of a nitrogen molecule when released from the Earth's surface before coming to rest.

Solution:

The maximum height attained by nitrogen gas molecule = h
The temperature of nitrogen gas particle = T = 330 K

The average kinetic energy of the gas particles is given by:

$K.E=\frac{3}{2}K_bT\\\\K.E=\frac{3}{2}\times 1.38\times 10^{-23} J/K\times 330 K\\\\K.E=6.381\times 10^{-21} J$

The nitrogen molecule at its maximum height will have zero kinetic energy as all the kinetic energy will get converted into potential energy

The potential energy at height h = $P.E = 6.381\times 10^{-21} J$
Molar mass of nitrogen gas = 28.0134 g/mol
Mass of nitrogen gas molecule = m

$m= \frac{ 28.0134 g/mol}{6.022\times 10^{23} mol^{-1}}=4.652\times 10^{-23} g\\\\1g=0.001kg\\\\m=4.652\times 10^{-23}\times 0.001 kg\\\\=4.652\times 10^{-26} kg$

The acceleration due to gravity = g = 9.8 m/s^2
The maximum height attained by nitrogen gas molecule = h
The potential energy is given by:

$P.E=mgh$

$6.381\times 10^{-21} J=4.652\times 10^{-26} kg\times 9.8 m/s^2\times h\\\\h=\frac{6.381\times 10^{-21} J}{4.652\times 10^{-26} kg\times 9.8 m/s^2}\\\\h=13,996.6 m\\\\1 m = 0.001 km\\\\h=13,996.6 m=h=13,996.6\times 0.001 k m\\\\=13.9966 km \approx 14 km$

The maximum height at which nitrogen molecule will go before coming to rest is 14 kilometers.

Learn more about the average kinetic energy of gas particles here:

brainly.com/question/16615446?referrer=searchResults

brainly.com/question/6329137?referrer=searchResults

6 0

1 year ago