Question

Question 1 (True/False Worth 2 points) (04.03 LC) When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the compound because lead is lower on the activity series. True False Question 2(Multiple Choice Worth 4 points) (04.03 MC) Which of the following equations has the correct products and is balanced correctly for a reaction between Na3PO4 and KOH? Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction Na3PO4 + KOH → Na3OH + KPO4, because K increases in charge from 1+ to 3+ when it is replaced Na3PO4 + KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction Na3PO4 + KOH → Na3OH + K3PO4, because K increases in charge from 1+ to 3+ when it is replaced Question 3(Multiple Choice Worth 4 points) (04.03 LC) Which of the following is a single replacement reaction? Ba(OH)2 + H2SO4 → BaSO4 + 2H2O 2Mg + O2 → 2MgO H2O+ CO2 → H2CO3 Zn + H2SO4 → ZnSO4 + H2 Question 4(Multiple Choice Worth 4 points) (04.03 MC) Sodium metal reacts with water to produce hydrogen gas. What best describes this reaction? A single replacement reaction takes place because sodium is less reactive than hydroxide ions. A double replacement reaction takes place because sodium is less reactive than hydroxide ions. A double replacement reaction takes place because sodium is more reactive than hydrogen. A single replacement reaction takes place because sodium is more reactive than hydrogen. Question 5 (True/False Worth 2 points) (04.03 LC) A single replacement reaction is a reaction in which one element replaces a similar element within a compound. True False Question 6(Multiple Choice Worth 4 points) (04.03 MC) The table shows the nature of reactants and products formed in a certain type of chemical reaction. Nature of Reactants and Products Reactants Products Metal + Ionic compound Metal + Ionic compound Which of the following is true about the type of chemical reaction? It is a single replacement reaction, and the anions in the two ionic compounds are different. It is a single replacement reaction, and the cations in the two ionic compounds are different. It is a double replacement reaction, and the anions in the two ionic compounds are different. It is a double replacement reaction, and the cations in the two ionic compounds are different.

Answer 1

Answer 1)
`Pb+AlCl_3\rightarrow` no reaction

As lead lies lower in reactivity series, it is less reactive than Aluminium. It will not be able to displace aluminium from its salt and hence no reaction occur. Thus the given statement is false.

2)
`Na_3PO4+3KOH\rightarrow 3NaOH+K_3PO_4`, because K retains the same charge throughout the reaction.

A balanced chemical reaction is one in which the number of atoms on both sides of a chemical equation are same. Also K has an oxidation state or charge of +1 in
`KOH` as well as
`K_3PO_4`

3)
`Zn+H_2SO_4\rightarrow ZnSO_4+H_2`

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.Thus zinc can easily lose electrons as compared to hydrogen and result in the formation of zinc sulfate and hydrogen.

`Ba(OH)_2+H_2SO_4\rightarrow BaSO_4+2H_2O`: is a double displacement reaction in which ion exchange takes place.

`2Mg+O_2\rightarrow 2MgO`: It is a synthesis reaction as two reactants combine to give a single product.

`H_2O+CO_2\rightarrow H_2CO_3`: It is a synthesis reaction as two reactants combine to give a single product.

4)
`2Na+2H_2O\rightarrow 2NaOH+H_2` Sodium metal reacts with water to produce hydrogen gas: A single replacement reaction takes place because sodium is more reactive than hydrogen.

Sodium easily lose electrons than hydrogen and get oxidized to
`Na^+` in NaOH and
`H^+` get reduced to give
`H_2`

5) A single replacement reaction is a reaction in which one element replaces a similar element within a compound - False

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A double displacement reaction is one in which exchange of ions take place.

6) Metal + Ionic compound : It is a single replacement reaction, and the cations in the two ionic compounds are different.

Example:
`2K+MgCl_2\rightarrow 2KCl+Mg` where K is a metal and
`MgCl_2` is an ionic compound. K being more reactive than Mg, displaces it from its salt solution.