To what temperature must an ideal gas at 27°C be cool to reduce its volume by 1/3

kotegsom [21]

There are several different kinds of indicator electrodes. Several metals, such as silver, copper, lead, cadmium, and mercury, will participate in a reversible electron exchange and can serve as indicator electrodes for their ions.

3 0

3 years ago

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

Which of the following equations has correct formulas and also is a balanced equation?

gayaneshka [121]

The equations that has the correct formulas and also is a balanced equation are:
2Be + O2 - > 2BeO
Mg + O2 - > MgO2
The answer are letters C and D. The rest of teh choices are not balanced chemical equations.

3 0

3 years ago

Read 2 more answers

Which step in an investigation involves predicting the results?

Firdavs [7]

Forming a hypothesis

Explanation:

The step in an investigation which involves the prediction of results is the stage of forming of a hypothesis.

A hypothesis is a stage in scientific investigation that follows shortly after asking a simple scientific question.
Hypothesis is simply a scientific guess that is logical in nature.
It presents a problem in a manner in which the problem is stated, the cause and the likely outcome can be predicted.
After a hypothesis formulation, the experiment is conducted and results of findings weighed against the predictions of the statement.

learn more:

Hypothesis brainly.com/question/3418951

#learnwithBrainly

5 0

3 years ago

HELP ASAP!!!!

never [62]

Answer:

what are the answer choices??

7 0

3 years ago