Question

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Answer 1

1 Double displacement

2 A) a reaction in which the exchange of electrons (or oxygen) occurs

3 A) Silver has a lower activity than hydrogen and cannot replace it.

4 C) 2C₂H₆ + 7O₂  →  4CO₂  +6H₂O 

5. two

6.C) redox

7.B) The ions of two ionic compounds switch places and a gas is formed.

Explanation:

Problem 1:

  Equation of the reaction:

                Na₂S + Cd(NO₃)₂→CdS + 2NaNO₃

               

The above reaction is a double displacement reaction in which ions of two ionic compounds changes position to form new products.

A double displacement reaction is also known as metathesis.

• The reaction involves actual exchange of partners to form new products.
• In most double displacement reactions, precipitates are usually formed.
• There might also be formation of water and any non-ionizing compound.
• liberation of a gaseous product.

Learn more:

precipitates brainly.com/question/8896163

Question 2

A) a reaction in which the exchange of electrons (or oxygen) occurs:

Redox reactions are reactions in which one species is reduced and another species is oxidized simultaneously.

• In this reaction types, there is exchange of electrons between reacting species.
• In non-redox reactions, there is no exchange or transfer of electrons.
• Redox reactions involves the transfer of electrons in which a specie gains and the other loses.

Learn more:

Oxidation brainly.com/question/2086855

Question 3:

A) Silver has a lower activity than hydrogen and cannot replace it.

                   H₂O + Ag→no reaction

The reaction above is a single replacement reaction

• The replacement of a metallic ion in solution by a metal higher in the activity series than the metal in solution is this kind of reaction.
• The positions of the two elements in the activity series provides the driving force for this reaction.
• Hydrogen is higher than Ag in the reactivity series.
• Since hydrogen is more reactive, Silver cannot displace it and the reaction will not occur.

Learn more:

Reactivity brainly.com/question/2193659

Question 4:

                                 4 C) 2C₂H₆ + 7O₂  →  4CO₂  +6H₂O 

Solution:

                            C₂H₆ + O₂→CO₂+H₂O

     For combustion reactions in hydrocarbons, we use the expression below:

        CₓHₙ   + x + $\frac{n}{4}$O₂ → xCO₂ + $\frac{n}{2}$H₂O

  x = 2  , n = 6

         x + $\frac{n}{4}$ = 2 + $\frac{6}{4}$ = $\frac{7}{2}$

         $\frac{n}{2}$ = $\frac{6}{2}$ = 3

  multiply the coefficients by 2:

           2, 7, 4 and 6

learn more:

Combustion brainly.com/question/1971314

Question 5

four

                   2NaNO₃      +    CaCl₂ →     2NaCl       +      Ca(NO₃)₂

To find the number of atoms of Na, we must understand what an atom really is;

  An atom is the smallest particle of an atom that takes part in chemical reaction. Distinct elements are made up unique types of atoms.

In the above reaction, we have:

 2moles of NaNO₃ on the left hand side:

          we have 2 Atoms of Na,

                          2 atoms N

                           6 atoms of O

 2 moles of NaCl contains:

                  2 atoms of Na

                   2 atoms of Cl

In all, we have 4 atoms of Na

 

learn more:

Atoms brainly.com/question/10216585

Question 6

C) redox

               AgNO₃(aq)+Cu(s)→Ag(s)+Cu(NO₃)₂(aq)

 In a redox reaction, a specie is reduced and another is oxidized in the reaction.

• In this reaction, one specie loses electrons and the other gains it.
• Certain reactants change their oxidation state so as to form products.

In the reaction above,

  Ag undergoes reduction; it goes from Ag⁺ to Ag from a +1 to zero.

whereas Copper goes from O to 2+ oxidation state.

Actually, this reaction is more appropriately described as a single displacement reaction in which atom higher in the activity series displaces the lower one.

learn more:

Redox Oxidation brainly.com/question/2086855

Question 7:

B) The ions of two ionic compounds switch places and a gas is formed.

• A double displacement reaction is also known as metathesis or double replacement reaction.
• It usually involves ionic compounds.
• The reaction involves an exchange of partners to form new compounds.

One of the following serves as driving force for double displacement reactions:

• formation of an insoluble compound called precipitate
• formation of water or any other non-ionizing compound
• liberation of a gaseous product.

Learn more:

Precipitate formation brainly.com/question/8896163

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