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HACTEHA [7]
3 years ago
10

Hot asphalt poured onto flat ground cools to form a solid road surface. Chemical or physical change

Chemistry
1 answer:
Verdich [7]3 years ago
6 0
<h2>Answer:</h2>

This is a physical change.

<h3>Explanation:</h3>

Hot asphalt is mixed with the sand crushed stones and spread onto the roads, when it gets dry it becomes hard giving a smooth straight surface of the road.

Asphalt is used to stick together stones and sand in the road.

It is a physical change because the phase of the asphalt changed from the liquid to solid.

At high temperature, asphalt is in liquid form and at room temperature, it is present in hard solid form.

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Boron has two naturally occurring isotopes; B-10 with a mass of 10.01 amu and a natural abundance of 20.00%, and B-11 with a mas
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Atomic mass of boron = 10.81

<h3>What are Isotopes?</h3>

Isotopes are variants of a particular element in which they have the same number of protons but differ in the number of neutrons in the atom.

So, here as we said we have isotopes which weigh 10.01 and 11.01.

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Then the relative atomic mass depends upon the relative abundance of various isotopes of that particular element. Suppose an element consists of two isotopes and average atomic mass is equal to

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= 1081/100

= 10.81

To learn more about atomic mass from the given link

brainly.com/question/3187640

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