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3 years ago

What is an element considered a pure substance?

1 answer:

8 0

A compound is a pure substance composed of two or more different atoms chemically bonded to one another. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.

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IS ANYONE GOOD AT CHEMISTRY?! like frr. I need help

wariber [46]

Yeah, what do you need help with?

8 0

3 years ago

Cu + H2O --> CuO + H2

bazaltina [42]

In the reduction-oxidation reaction given, Cu is reduced because it gained 2 electrons, on the other hand H2 is oxidized because it gained one electron. I hope this helps.

5 0

3 years ago

Read 2 more answers

Which statements are true? The oxidation number for Cu(s) is +2. An oxidizing agent gains electrons. Na+ is formed from the redu

just olya [345]

Answer: The correct statements are:

An oxidizing agent gains electrons and $Zn^{2+}$ is formed from the oxidation of Zn(s).

Explanation:

For the given options:

Statement 1: The oxidation number for Cu(s) is +2

Copper is the 29th element of the periodic table having electronic configuration of $[Ar]3d^{10}4s^1$

This element can show +1 or +2 oxidation states. Thus, this statement is false.

Statement 2: An oxidizing agent gains electrons.

Oxidizing agents are defined as the agents which oxidize other substance and itself gets reduced. These agents undergoes reduction reactions and reduction reaction is the reaction in which an atom gains electrons.

Thus, this statement is True.

Statement 3: $Na^+$ is formed from the reduction of Na(s)

Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.

$X\rightarrow X^{n+}+ne^-$

Sodium is the 11th element and it will loose electrons to form sodium ion.

$Na\rightarrow Na^++e^-$

Hence, this statement is false.

Statement 4: The oxidation number for Hg(l) is 0.

Mercury is the 80th element of the periodic tale having electronic configuration of $[Xe]4f^{14}5d^{10}6s^2$

This element can show +1 or +2 oxidation states. Thus, this statement is false.

Statement 5: A reducing agent gains electrons.

Reducing agents are defined as the agents which reduces the other substance and itself gets oxidized. These agents undergoes oxidation reactions and oxidation reaction is defined as the reaction in which an atom looses its electrons.

Thus, this statement is false.

Statement 6: $Zn^{2+}$ is formed from the oxidation of Zn(s)

Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.

$X\rightarrow X^{n+}+ne^-$

Zinc is the 30th element and it will loose electrons to form zinc ion.

$Zn\rightarrow Zn^{2+}+2e^-$

Thus, this statement is True.

Hence, the correct statements are:

An oxidizing agent gains electrons and $Zn^{2+}$ is formed from the oxidation of Zn(s).

4 0

3 years ago

Read 2 more answers

What occurs during one half-life?

lorasvet [3.4K]

The half-life of a radioactive compound is the time taken for that said isotope to decay or disintegrate so that only half of the initial atoms remain in that compound. During the decay process, the isotope will give off energy and matter, and the way to depict this is indicated by t 1/2.

8 0

4 years ago

Read 2 more answers

John (travel) to Russia next week correct the tense

kondor19780726 [428]

Answer:

Explanation:

John will travel to Russia next week

hope it helps

have a nice day

7 0

3 years ago

Read 2 more answers