Practice Single Displacement in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

A reaction in which one element replaces another in a compound, following the pattern A+BC→AC+BA + BC \rightarrow AC + B (or A+BC→BA+CA + BC \rightarrow BA + C, depending on which element is displaced).

A bully element kicks a weaker one out of its compound — like a stronger player replacing a weaker one on a team.

Showing a random 20 of 50 problems.

Example 1

challenge
Excess Al reacts with 0.30 mol CuCl2CuCl_2. Mol Cu produced? (2Al+3CuCl2→2AlCl3+3Cu2Al + 3CuCl_2 \rightarrow 2AlCl_3 + 3Cu)

Example 2

challenge
A 4.8 g Mg strip (M=24) is added to 100 mL of 1.0 M CuSO4_4. Identify the limiting reactant and find grams of Cu (M=64) produced.

Example 3

easy
Single displacement follows the pattern A + BC → ____ + ____.

Example 4

hard
What single displacement reaction explains why zinc-coated nails (galvanized) protect iron from rusting?

Example 5

medium
Balance: Fe+AgNO3→Fe(NO3)3+Ag\text{Fe} + \text{AgNO}_3 \rightarrow \text{Fe(NO}_3)_3 + \text{Ag}.

Example 6

hard
Find the volume of H2_2 at STP (22.4 L/mol) produced from 1.30 g Zn (M=65) and excess HCl.

Example 7

hard
A 6.5 g iron sample (M=56) is placed in excess CuSO4_4 solution. Find the mass of Cu (M=64) deposited. (Fe+CuSO4→FeSO4+Cu\text{Fe} + \text{CuSO}_4 \rightarrow \text{FeSO}_4 + \text{Cu})

Example 8

easy
True or false: single displacement reactions are also redox reactions.

Example 9

medium
Predict and balance: Cl2+2NaBr→Cl_2 + 2NaBr \rightarrow ? (Cl more reactive than Br)

Example 10

easy
Complete: Fe+CuSO4→Fe + CuSO_4 \rightarrow ? (Fe more reactive than Cu)

Example 11

easy
Write the balanced equation for zinc metal reacting with hydrochloric acid.

Example 12

hard
2.72.7 g Al reacts with excess CuSO4_4. How many grams of Cu (M=64) are produced? (2Al+3CuSO4→Al2(SO4)3+3Cu2\text{Al} + 3\text{CuSO}_4 \rightarrow \text{Al}_2(\text{SO}_4)_3 + 3\text{Cu}, MAl_\text{Al}=27)

Example 13

medium
Predict and balance: F2+NaBr→\text{F}_2 + \text{NaBr} \rightarrow ? (F more reactive than Br)

Example 14

medium
Balance: Mg+Fe2O3→MgO+FeMg + Fe_2O_3 \rightarrow MgO + Fe.

Example 15

easy
Will CuCu displace AgAg in AgNO3AgNO_3? (Cu is more reactive than Ag)

Example 16

hard
3.24 g Al (M=27) reacts with excess HCl. Find the moles of H2_2 produced. (2Al+6HCl→2AlCl3+3H22\text{Al} + 6\text{HCl} \rightarrow 2\text{AlCl}_3 + 3\text{H}_2)

Example 17

easy
Will copper displace zinc from ZnSO4\text{ZnSO}_4? (Activity: Zn > Cu)

Example 18

easy
Classify: Mg+2HCl→MgCl2+H2\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2.

Example 19

medium
Predict and balance: Al+Pb(NO3)2→\text{Al} + \text{Pb(NO}_3)_2 \rightarrow ? (Al > Pb)

Example 20

easy
Which is single displacement? (a) AgNO3+NaCl→AgCl+NaNO3AgNO_3 + NaCl \rightarrow AgCl + NaNO_3 (b) Mg+2HCl→MgCl2+H2Mg + 2HCl \rightarrow MgCl_2 + H_2
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