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Alex
3 years ago
13

The hardest known mineral is _____. topaz talc diamond graphite

Chemistry
2 answers:
klemol [59]3 years ago
8 0
Diamond. It can only be cut with another diamond.
erastova [34]3 years ago
5 0

Answer: Option (c) is the correct answer.

Explanation:

Moh's scale is used to detect the harness of a mineral. This scale displays harness of 10 minerals.

According to Moh's scale, the hardness of minerals given in the option are as follows:

  • Topaz = 8
  • Talc = 1
  • Diamond = 10

Graphite is not included in Moh's scale.

Thus, we can conclude that the hardest known mineral is diamond.


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Answer:

The difference in temperature is significant means that the lower-boiling liquid finishes distilling at a temperature that is too low for the higher-boiling liquid to be in vapor form yet.

Explanation:

The temperature will rise as the vapor of lower-boiling liquid rushes into the distillation head. However once the lower-boiling liquid is done distilling, there is a temperature drop because while the lower temperature liquid is done distilling, the temperature is still too low for the higher-boiling liquid to be rushing in as a vapour, so the temperature drops.

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The rate constant for a certain reaction is k = 5.40×10−3 s−1 . If the initial reactant concentration was 0.100 M, what will the
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Answer : The concentration after 17.0 minutes will be, 4.05\times 10^{-4}M

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The expression for first order reaction is:

[C_t]=[C_o]e^{-kt}

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Now put all the given values in the above expression, we get:

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[C_t]=4.05\times 10^{-4}M

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