Because <span>Gold is a very inert metal, and won't really react with oxygen in the air.

The only reason other metals tarnish, such as copper, silver, steel/iron, is

because they're freely reacting with air, to produce a metal oxide surface layer. </span>

3 0

4 years ago

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How are solutions and compounds similar?

lapo4ka [179]

Answer:

A compound is a pure substance that is composed of elements chemically bonded in definite proportions. A compound can be broken down into simpler substances only by chemical reactions, such as electrolysis. A solution is a homogeneous mixture, meaning that it is the same throughout.

Explanation:

8 0

3 years ago

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What is ΔrH° for the following phase change? LiCl(s) → LiCl(l)

Yanka [14]

Answer:

$\Delta _rH=17.51\frac{kJ}{mol}$

Explanation:

Hello!

In this case, since the enthalpy change for any process is computed by subtracting the enthalpy of the final state and the enthalpy of the initial state, for the given phase change, we subtract the enthalpy of the liquid (final state) and the enthalpy of the solid (initial state) considering this a melting process:

$\Delta _rH=-390.76\frac{kJ}{mol} -(-408.27\frac{kJ}{mol} )\\\\\Delta _rH=17.51\frac{kJ}{mol}$

Which makes sense because this process absorbs energy.

Best regards!

5 0

2 years ago