How many moles of sodium sulfate are present in .100 g of the compound?

Complete and balance the chemical equations for the precipitation reactions, if any, between the following pairs of reactants, a

Crank

Explanation:

a. $Pb(NO_3)_2(aq) + Na_2SO_4(aq)$ → ?

$Pb(NO_3)_2(aq) + Na_2SO_4(aq)\rightarrow PbSO_4(s)+2NaNO_3(aq)$

$Pb(NO_3)_2(aq)\rightarrow Pb^{2+}(aq)+2NO_3^{-}(aq)$

$Na_2SO_4(aq)\rightarrow 2Na^++SO_4^{2-}(aq)$

$Pb^{2+}(aq)+2NO_3^{-}(aq)+2Na^++SO_4^{2-}(aq)\rightarrow PbSO_4(s)+2Na^++2NO_3^{-}(aq)$

Removing common ions from both sides, we get the net ionic equation:

$Pb^{2+}(aq)+SO_4^{2-}(aq)\rightarrow PbSO_4(s)$

b. $NiCl_2(aq) + NH_4NO_3(aq)$ →

$NiCl_2(aq) + NH4NO_3(aq) \rightarrow Ni(NO_3)_2+NH_4Cl(aq)$

No precipitation is occuring.

c. $Fe_Cl2(aq) + Na_2S(aq)$ →

$FeCl_2(aq) + Na_2S(aq)\rightarrow FeS(s)+2NaCl(aq)$

$FeCl_2(aq)\rightarrow Fe^{2+}(aq)+2Cl^{-}(aq)$

$Na_2S(aq)\rightarrow 2Na^++S{2-}(aq)$

$Fe^{2+}(aq)+2Cl^{-}(aq)+2Na^++S^{2-}(aq)\rightarrow FeS(s)+2Na^++2Cl^{-}(aq)$

Removing common ions from both sides, we get the net ionic equation:

$Fe^{2+}(aq)+S^{2-}(aq)\rightarrow FeS(s)$

d. $MgSO_4(aq) + BaCl_2(aq)$ →

$MgSO4(aq) + BaCl2(aq)\rightarrow BaSO_4(s)+MgCl_2$

$MgSO_4(aq)\rightarrow Mg^{2+}(aq)+SO_4^{2-}(aq)$

$BaCl_2(aq)\rightarrow Ba^{2+}+2Cl^{-}(aq)$

$Mg^{2+}(aq)+SO_4^{2-}(aq)+Ba^{2+}+2Cl^{-}(aq)(aq)\rightarrow BaSO_4(s)+Mg^{2+}(aq)+2Cl^{-}(aq)$

Removing common ions from both sides, we get the net ionic equation:

$Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)$

5 0

2 years ago

Chemical Reaction

Zina [86]

Answer:

I think that frying an egg is a chemical because it takes in heat in order to make the reaction occur.

6 0

2 years ago

10.

kondor19780726 [428]

Answer:

A.

Explanation:

The leading zeros in c, d, and e are not significant. There is no zero in b. Just one left and all it's zeros are significant.

5 0

2 years ago

Which of the following elements has the lowest electronegativity value?

andrezito [222]

Answer:

i think the answer is lettee e- Na.

3 0

2 years ago

When a disulfide linkage is formed, the compound containing this new linkage has been __________?

gregori [183]

<h3>Answer:</h3>

When a disulfide linkage is formed, the compound containing this new linkage has been <u>oxidized</u>.

<h3>Explanation:</h3>

Oxidation reaction is defined as,

i) Addition of Oxygen Atoms:

When oxygen atom is added to any compound, then the compound is said to be oxidized and the reaction is known as oxidation reaction.

Example:

Oxidation of Alcohols into carboxylic acids:

R---CH₂--OH → R---COOH

ii) Removal of Hydrogen Atoms:

When hydrogen atom(s) are removed from any compound, then the compound is said to be oxidized and the reaction is also called as oxidation reaction.

Example:

Formation of disulfide bond fro thiols:

R--S-H + R--S-H → R---S--S---R

Disulfide bond is quite popular in protein chemistry where it is formed in cystine from cystein amino acids.

5 0

2 years ago