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3 years ago

Is hot asphalt poured onto flat ground cools to from a solid road surface a physical or chemical change?

Chemistry

2 answers:

Phantasy [73]3 years ago

8 0

When hot asphalt is poured onto flat ground cools to form a solid road surface is a chemical change.

Asphalt is a plastic hydrocarbon ,when in liquid condition reacts with oxygen in air to react to become a solid.

aliina [53]3 years ago

7 0

⇒Tar is mainly made up of a collection of very heavy hydrocarbons, with rather high melting temperatures. Commonly, it is mixed with some stones or gravel to make a harder surface for roads. It is possible to heat this up to soften or melt this; you can try it yourself by heating it in a metal can over a stove (don't use a container that you plan to keep clean) or in a wood or coal fire.
it is reversible

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3 years ago

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jeka94

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1. 266.22 g/mol

2. 168.81 g/mol

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Explanation:

For you to calculate the molar mass of the salt you need to sum the molar masses of every element in the salt.

In the first salt, PdBr $2_{123}$ , the subscript 2 means that there are 2 atoms of Br. So for you to calculate the molar mass of the salt you need to sum the molar mass of Pd and 2 times the molar mass of Br, as follows:

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In the second salt BeBr $2_{123}$ there are 2 atoms of Br and 1 of Be, so the molar mass is:

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In the third salt CuBr $2_{123}$ there are 2 atoms of Br and 1 of Cu, so the molar mass is:

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And in the fourth salt CaBr $2_{123}$ there are 2 atoms of Br and 1 of Ca, so the molar mass is:

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3 years ago

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Answer:

See attached

Explanation:

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