CHEMISTRY HIGH SCHOOL

In which reaction are electrons transferred from one reactant to another reactant?(1) 2Ca(s) + O2(g) =>2CaO(s)
(2) AgNO3(aq) + KCl(aq) =>AgCl(s) + KNO3(aq)
(3) HCl(aq) + NaOH(aq) =>NaCl(aq) + H2O(l)
(4) H3O+(aq) + OH-(aq) => 2H=O(l)

Answers

Answer 1
Answer:

Answer : The correct reaction is, (1) 2Ca(s)+O_2(g)\rightarrow 2CaO(s)

Explanation :

(1) 2Ca(s)+O_2(g)\rightarrow 2CaO(s)

In this reaction, the oxidation state of calcium (Ca) changes from (0) to (+2) and the oxidation state of oxygen (O) changes from (0) to (-2). In this reaction the electrons are transferred from one reactant (calcium) to another reactant (oxygen). This is a synthesis reaction.

(2) AgNO_3(aq)+KCl(aq)\rightarrow AgCl(s)+KNO_3(aq)

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a double-displacement reaction.

(3) HCl(aq)+NaOH(aq)\rightarrow NaCl(aq)+H_2O(l)

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a neutralization reaction.

(4) H_3O^+(aq)+OH^-(aq)\rightarrow 2H_2O(l)

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a combination reaction.

Hence, the correct reaction is, (1) 2Ca(s)+O_2(g)\rightarrow 2CaO(s) in which the electrons transferred from one reactant to another reactant.
Answer 2
Answer: The answer is (1). The electrons transfer form one reactant to another means that there is the change of valence. For other choices, the valence of reactant does not change.

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Answers

It depends on what you are separating from the liquid. If it is a solid you can just filter it or put it in a centrifuge. If it is a dissolved solvent you might need to use something like chromatography. I am not very sure though. I hope this helps. Let me know if anything is unclear.

The Solvay process is a multistep industrial process used to produce washing soda, Na2CO3(s). In the last step of the Solvay process, NaHCO3(s) is heated to 300°C, producing washing soda, water, and carbon dioxide. This reaction is represented by the balanced equation below.2NaHCO3(s) + heat ==> Na2CO3(s) + H2O(g) + CO2(g)

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Answers

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The electric field induces the flow of electrons, known as __________________, a.voltage
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Answers

The answer is b. electric current.

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electrical conductivity

thermal conductivity

Answers

thermal conductivity

Answer:

Thermal conductivity

Explanation:

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Answers

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Which atom in the ground state has a partially filled second electron shell?hydrogen atom
lithium atom
potassium atom
sodium atom

Answers

The atoms having partially filled shells have orbitals with electrons half or less than the number of electrons that can be accomodated in it.  The atom which has a partially filled second electron shell in the ground state is lithium.

What is lithium?

Lithium is 3rd element in periodic table and thus having 3 electrons in it. The main shell electronic configuration of lithium is written as K=2, L=1. Thus the second shell L has only one electron and it is said to be partially filled.

The element hydrogen is having only one electron located in the K shell and it have o more shells which are filled.

The elements sodium and potassium are first group elements sodium with 11 electrons and potassium atom with 19 electrons. Both are having 3 main shells and one electron in the last shell. Thus their second shell is completely filled.

Hence, the atom which have partially filled second electron shell in the ground state among the following is lithium. Thus, option B is correct.

To find more about lithium, refer the link below;

brainly.com/question/27642226

#SPJ2
Atoms have electrons filled in energy shells.
1. H - hydrogen atom has one electron in the First energy shell. Therefore hydrogen has a partially filled first energy shell

2.Li - Li electron configuration is 2,1
The outermost energy shell is the second energy shell in which there is only one electron
Therefore the second energy shell is partially filled. This is the correct answer

3. K - electron configuration is 2,8,8,1
The outermost energy shell is the fourth energy shell which is partially filled. The second energy shell is completely filled

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