Worksheet: Uses of Ammonia

In this worksheet, we will practice describing the uses of ammonia, balancing reaction equations, and calculating the quantities of ammonia involved.

Q1:

Bleach, an aqueous solution of sodium hypochlorite ( N a C l O ) , is often used alongside ammonia as a cleaning agent. However, it is important that bleach and ammonia are never mixed, as the compounds react to form chloramine ( N H C l ) 2 .

Give a balanced chemical equation for this reaction.

  • A N H + 2 N a C l O N H C l + 2 N a C l + O 3 2 2
  • B 2 N H + 2 N a C l O 2 N H C l + N a O + H O 3 2 2 2
  • C N H + N a C l O N H C l + N a O 3 2
  • D N H + N a C l O N H C l + N a O H 3 2
  • E N H + 3 N a C l O N H C l + 3 N a O H + C l 3 2 2

What is the main hazard associated with the reaction of bleach and ammonia?

  • AChloramine is a toxic gas.
  • BA highly corrosive solution is produced.
  • CThe reaction is highly exothermic.
  • DChloramine is a corrosive gas.
  • EChloramine is an explosive gas.

Q2:

What is the main hazard associated with aqueous ammonia solutions?

  • AFlammable
  • BToxic
  • COxidizing
  • DCorrosive
  • EIrritant

Q3:

Ammonia and carbon dioxide are both gaseous at room temperature and pressure. The pure materials are widely used and share a large number of industrial applications. The compounds can form aqueous solutions and react together in water to produce a solid material.

In which of the following ways are molecules of ammonia and carbon dioxide similar?

  • ABoth molecules are heavier than the average molecule in air.
  • BBoth molecules are polar.
  • CThe molecules contain the same number of bonding electrons.
  • DBoth molecules react with water.
  • EThe molecules have the same shape.

Which of the following is not an application for which pure ammonia and pure carbon dioxide are both directly useful?

  • AFuel
  • BFertilizer manufacture
  • CBiomaterial production
  • DRefrigeration
  • ESolvent

What is the name of the solid material formed when excess ammonia and carbon dioxide react in water?

  • AAmmonium carboxylate
  • BAmmonium hydrogen carbonate
  • CAmmonium carbonate
  • DAmmonium carbamate
  • EAmmonium carbide

Write a balanced chemical equation for the reaction of excess ammonia with carbon dioxide in water.

  • A N H + C O + H O ( N H ) C O 3 2 2 4 2 3
  • B N H + C O + H O ( N H ) H C O 3 2 2 4 3
  • C N H + C O N H C O 3 2 3 2
  • D 2 N H + 2 C O + 2 H O 2 N H C O + H 3 2 2 4 3 2
  • E 2 N H + C O ( N H ) C O + H O 3 2 2 2 2

Q4:

Why is the electrical conductivity of a dilute aqueous ammonia solution higher than that of pure water?

  • AAmmonia is more polar than water, so it responds more strongly to an electric field.
  • BAmmonia reacts with water to produce amide and hydronium ions.
  • CAmmonia molecules are smaller than water molecules, so they diffuse more rapidly.
  • DAmmonia reacts with water to produce hydroxide and ammonium ions.
  • EAmmonia molecules interact more weakly than water molecules, so they diffuse more rapidly.

Q5:

Ammonia reacts with nitric acid to produce a solid compound X , which is used as a fertilizer.

What is the name of compound X ?

  • ANitrosamine
  • BAmmonium nitrite
  • CAmyl nitrate
  • DAmmonium nitrate
  • ENitrylamine

Give a balanced chemical equation for this reaction.

  • A N H + H N O N H N O 3 3 4 3
  • B N H + H N O ( N H ) N O 3 2 2 4 2 2
  • C N H + H N O N H N O 3 2 4 2
  • D 2 N H + H N O ( N H ) N O 3 2 3 4 2 3
  • E N H + H N O N H N O 3 4

What color is the solid X ?

  • ABlack
  • BBrown
  • CWhite
  • DYellow
  • ERed

When heated, compound X decomposes into nitrous oxide ( N O 2 ) and one other product. Give a balanced chemical equation for this reaction.

  • A N H N O N O + 2 H O 4 3 2 2
  • B N H N O N O + 2 H O 4 2 2 2
  • C 2 ( N H ) N O 3 N O + H O 4 2 2 2 2
  • D N H N O N O + 2 H 4 2 2
  • E 2 ( N H ) N O 3 N O + 8 H 4 2 3 2 2

Q6:

Ammonia can react with oxygen to form nitrogen dioxide ( N O ) 2 , nitric oxide ( N O ) , and nitrous oxide ( N O ) 2 . Nitrogen dioxide is useful for the manufacture of nitric acid.

In the presence of a platinum-rhodium catalyst, ammonia reacts with oxygen to produce nitric oxide and water. Give a balanced chemical equation for this reaction.

  • A 6 N H + 7 O 6 N O + 9 H O 3 2 2
  • B 2 N H + 3 O 2 N O + 3 H O 3 2 2
  • C 3 N H + 2 O 3 N O + 3 H O 3 2 2
  • D 4 N H + 5 O 4 N O + 6 H O 3 2 2
  • E 5 N H + 6 O 5 N O + 7 H O 3 2 2

In the presence of a catalyst containing manganese dioxide, ammonia reacts with oxygen to produce nitrous oxide and water. Give a balanced chemical equation for this reaction.

  • A 2 N H + 2 O N O + 3 H O 3 2 2 2
  • B 4 N H + 3 O 2 N O + 4 H O 3 2 2 2
  • C 2 N H + O N O + H O 3 2 2 2
  • D 3 N H + 4 O 3 N O + 5 H O 3 2 2 2
  • E 3 N H + 3 O 2 N O + 4 H O 3 2 2 2

Nitric oxide and nitrous oxide can react with further oxygen to form nitrogen dioxide. Calculate the mass of oxygen required to produce 60.0 g of nitrogen dioxide from ammonia.

Q7:

Ammonia is useful for the production of nylon 6,6, a polymer with the empirical formula C H N O . 6 1 1 If all the nitrogen atoms in nylon 6,6 are derived from ammonia, calculate the mass of ammonia needed to produce 139 g of the polymer.

Q8:

Which property of ammonia is the most important for industrial purposes?

  • AToxicity
  • BBasicity
  • CLow boiling point
  • DNitrogen content
  • EEnergy content

Q9:

Inexpensive large-scale manufacture of ammonia began in the early 20th century. By the year 2000, the global annual production of ammonia was approximately 110 million tonnes.

Which industry produces the greatest demand for synthetically manufactured ammonia?

  • APharmaceutical
  • BCleaning
  • CEnergy
  • DAgriculture
  • EMilitary

The majority of synthetically manufactured ammonia is used in the production of a single type of product. To the nearest 10%, what percentage of the global annual production of ammonia was consumed for this purpose in the year 2000?

Q10:

Excess nitrogen is excreted by fish in the form of ammonia. By contrast, humans and most other mammals excrete nitrogen mainly as urea, C H N O 4 2 .

What property of ammonia makes it suitable for excretion by fish?

  • ASmall molecular size
  • BHigh basicity
  • CLow toxicity
  • DHigh solubility
  • ELow boiling point

What property of ammonia necessitates its conversion to urea before it is excreted by humans?

  • AHigh toxicity
  • BSmall molecular size
  • CHigh acidity
  • DLow solubility
  • ELow boiling point

Q11:

The reaction of lithium metal with liquid ammonia is similar to its reaction with water. Give a balanced chemical equation for this reaction.

  • A L i + N H L i N H 3 3
  • B L i + 2 N H L i ( N H ) + H 3 2 2 2
  • C L i + 2 N H L i ( N H ) 3 3 2
  • D 2 L i + 2 N H 2 L i N H + H 3 2 2
  • E 4 L i + 2 N H 2 L i N H + H 3 2 2 2

Q12:

Which of the following organic molecules would react with ammonia most readily?

  • AEthene
  • BEthane
  • CEthanol
  • DEthanoic acid
  • EEthyl acetate

Q13:

Ammonia reacts with hydrogen chloride to produce a solid compound X .

What is the name of compound X ?

  • AHydrochloramine
  • BNitrogen trichloride
  • CNitrogen hydrochloride
  • DAmmonium chloride
  • EAmmonium hydrochloride

Give a balanced chemical equation for this reaction.

  • A N H + H C l N H C l 3 4
  • B N H + 2 H C l N H C l 3 5 2
  • C 2 N H + 2 H C l 2 N H C l + H 3 3 2
  • D 2 N H + 4 H C l 2 N H C l + H 3 4 2 2
  • E 4 N H + 4 H C l 2 ( N H ) C l + C l 3 4 2 2

Why is the melting point of X higher than that of ammonia, which is a gas at room temperature?

  • AHydrogen bonds in the product are stronger than the ionic bonds in ammonia.
  • BCovalent bonds in the product are stronger than the covalent bonds in ammonia.
  • CIonic bonds in the product are stronger than the hydrogen bonds in ammonia.
  • DIonic bonds in the product are stronger than the covalent bonds in ammonia.
  • EHydrogen bonds in the product are stronger than the covalent bonds in ammonia.

Q14:

Ammonia reacts with oxygen to form nitric acid and one other product.

Give a balanced chemical equation for this reaction.

  • A N H + O H N O + H 3 2 2 2
  • B 2 N H + 4 O 2 H N O + H O 3 2 2 3 2 2
  • C 2 N H + 2 O 2 H N O + H 3 2 2 2 2
  • D N H + 2 O H N O + H O 3 2 3 2
  • E N H + O H N O + H O 3 2 2

Calculate the mass of nitric acid formed when 20.0 kg of ammonia reacts with excess oxygen.

Calculate the mass of oxygen needed to produce 50.5 tonnes of nitric acid from ammonia.

A 12.3 kg sample of ammonia reacts with 41.5 kg of oxygen to form 35.0 kg of nitric acid. By identifying the limiting reagent and determining the maximum mass of nitric acid that can be produced, calculate the percentage yield of this reaction.

Q15:

In the presence of a catalyst, ammonia reacts with oxygen to form nitrogen gas and one other product.

Give a balanced chemical equation for this reaction.

  • A 2 N H + 3 O N + 6 O H 3 2 2
  • B 2 N H + 3 O N + 3 H O 3 2 2 2 2
  • C 2 N H + O N + 3 H O 3 2 2 2
  • D 4 N H + 3 O 2 N + 6 H O 3 2 2 2
  • E 4 N H + 3 O 2 N + 6 H O 3 2 2 2 2

A sample of ammonia reacts with excess oxygen to produce 24.0 g of nitrogen gas. Calculate the mass of ammonia reacted.

A sample of ammonia requires 36.5 kg of oxygen for complete combustion. Calculate the mass of nitrogen gas produced.

Q16:

What is the most common method used to manufacture ammonia?

  • AWater-gas shift reaction
  • BContact process
  • CSteam refining
  • DHaber process
  • EElectrolysis

Q17:

A student prepares a dilute solution of ammonia in water and tests the pH using a universal indicator.

What color does the universal indicator change into?

  • APurple
  • BRed
  • CGreen
  • DBlue
  • EYellow

Give a balanced chemical equation for the main reaction responsible for the change in pH when ammonia is dissolved in water.

  • A N H + H O N H + O H 3 2 4 +
  • B N H + H O N H + H O 3 2 2 3 +
  • C 2 N H N H + N H 3 4 + 2
  • D N H + H O N H O H + H 3 2 2 2
  • E 2 N H + 2 H O 2 N H O H + H 3 2 3 2

Q18:

Ammonia can be used in the production of fertilizers. Which biomolecules in plants are produced directly from ammonia in the largest quantities?

  • ASugars
  • BLipids
  • CDNA
  • DProteins
  • ESterols

Q19:

The rocket propellants hydrogen peroxide ( H O ) 2 2 and hydrazine ( N H ) 2 4 both contain single covalent bonds between atoms of the same element:

O O H H N N H H H H

Ammonia reacts with hydrogen peroxide to form hydrazine and one other product. The bond energies of selected bonds are shown in the table.

Bond H H O H O O O O N H N N N N N N
Bond Energy kJ/mol 432 459 142 494 386 167 418 942

Give a balanced chemical equation for the formation of hydrazine from ammonia and hydrogen peroxide.

  • A 2 N H + 2 H O N H + 3 H O 3 2 2 2 4 2
  • B 2 N H + H O N H + 2 H + O 3 2 2 2 4 2 2
  • C 2 N H + 2 H O N H + 3 H + 2 O 3 2 2 2 4 2 2
  • D 2 N H + H O N H + 2 H O 3 2 2 2 4 2
  • E 2 N H + H O N H + 3 H O 3 2 2 2 4 2

What is the energy released by the reaction of ammonia and hydrogen peroxide per mole of hydrazine produced?

When used as a rocket propellant, hydrazine thermally decomposes into its constituent elements in their standard state. Calculate the energy released per mole of hydrazine reacted.

Whereas hydrazine thermally decomposes into its constituent elements, hydrogen peroxide converts to steam and oxygen when heated. The compounds are useful as rocket propellants because their decomposition reactions increase the temperature of the surroundings, 𝑇 , and the number of gas molecules in the system, 𝑁 . Compare the changes in 𝑇 and 𝑁 when a mole of each compound thermally decomposes.

  • A Hydrazine produces a smaller increase in 𝑇 and a larger increase in 𝑁 .
  • B Hydrazine produces a smaller increase in 𝑇 and the same increase in 𝑁 .
  • C Hydrazine produces a larger increase in 𝑇 and the same increase in 𝑁 .
  • D Hydrazine produces a larger increase in 𝑇 and a smaller increase in 𝑁 .
  • E Hydrazine produces a larger increase in both 𝑇 and 𝑁 .

Q20:

Which of the following symbols does not represent a hazard of pressurized ammonia gas?

  • A
  • B
  • C
  • D
  • E

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.