true or false If a material has a hardness of 8, it cannot be scratched by a material with a hardness of 7.

1 answer:

4 0

It is true because of the hardness differences. if there are differences between other things they don't normally work like fitting a cube into a circle is kinda like trying to scratch something that has a higher hardness.

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Heterogéneo de tres fases y un componente.

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Un sistema heterogéneo de 3 fases y 1 componente puede ser:

Sólido (hielo)
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3 years ago

. The net ionic equation for the reaction that occurs during the titration of nitrous acid with sodium hydroxide is (a) HNO2 Na

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Answer:

$H^+_{(aq)}+OH^{-}_{(aq)}\rightarrow H_2O_{(l)}$

Explanation:

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.

Only the species which are present in aqueous state dissociate.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a)

The balanced molecular equation will be,

$HNO_2_{(aq)}+NaOH_{(aq)}\rightarrow H_2O_{(l)}+NaNO_2_{(aq)}$