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2 years ago

Which one of the following are pure substances : water,salt water,copper,brass,air,oxygen

Chemistry

2 answers:

ANEK [815]2 years ago

5 0

Answer:

Copper, Water, and Oxygen

Explanation:

Because they are compounds and compounds are pure substances <3

ASHA 777 [7]2 years ago

5 0

Answer: copper

Explanation: because all of the atoms that make up copper are copper i.e its not a compound or mixture. not made od molecules

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Science chemistry Question:

shutvik [7]

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2 years ago

Which of these half-reactions represents reduction?

gogolik [260]

Answer: The half-reactions represents reduction are as follows.

$Cr_{2}O^{2-}_{7} \rightarrow Cr^{3+}$
$MnO^{-}_{4} \rightarrow Mn^{2+}$

Explanation:

A half-reaction where addition of electrons take place or a reaction where decrease in oxidation state of an element takes place is called reduction-half reaction.

For example, the oxidation state of Cr in $Cr_{2}O^{2-}_{7}$ is +6 which is getting converted into +3, that is, decrease in oxidation state is taking place as follows.

$Cr_{2}O^{2-}_{7} + 3 e^{-} \rightarrow Cr^{3+}$

Similarly, oxidation state of Mn in $MnO^{-}_{4}$ is +7 which is getting converted into +2, that is, decrease in oxidation state is taking place as follows.

$MnO^{2-}_{4} + 5 e^{-} \rightarrow Mn^{2+}$

Thus, we can conclude that half-reactions represents reduction are as follows.

$Cr_{2}O^{2-}_{7} \rightarrow Cr^{3+}$
$MnO^{-}_{4} \rightarrow Mn^{2+}$

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2 years ago

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adoni [48]

Answer:

chemical symbol= Cl ( chlorine)

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Does chlorine have a smaller ionic radius than soium.

mafiozo [28]

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2 years ago

1. Which of the following would likely form a heterogeneous mixture? (Points : 3)

Nata [24]

For the answer to the question above asking which of the following would likely form a heterogeneous mixture?

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Which one of the following are pure substances : water,salt water,copper,brass,air,oxygen​

Which one of the following are pure substances : water,salt water,copper,brass,air,oxygen