Copy the diagram below. Then fill in the common names of the substances. Besides each arrow say how the change is carried out. One example is shown.

Calcium carbonate occurs in nature in the form of limestone ( CaCO 3 ) . Limestone rock is heated to form calcium oxide, also known as lime ( CaO ) . Lime is further treated with water to form calcium hydroxide, known as slaked lime [ Ca ( OH ) 2 ] . Slaked lime is solid in nature. An aqueous solution of slaked lime is known as limewater, which is the common name of aqueous calcium hydroxide [ Ca ( OH ) 2 ] . Calcium hydroxide is treated with carbon dioxide to precipitate solid calcium carbonate.

Below is a flow chart for the Contact process: Why is a catalyst used?

Sulfuric acid is one of the most important chemical known. In industries, it is manufactured using the Contact process. It involves the use of sulfur or sulfur dioxide and water to synthesize sulfuric acid. A catalyst helps to increase the rate of the reaction in any chemical process. In the Contact process, vanadium pentoxide is used as catalyst. It speeds up the formation of sulfur trioxide from sulfur dioxide and oxygen. However, as it is a reversible reaction, sulfur trioxide tends to keep breaking down again. Hence, four beds of catalyst are used in the process, so that the reactants have higher chances of reacting.

Below is a flow chart for the Contact process: Write a chemical equation for the reaction that takes place on the catalyst.

Sulfuric acid is one of the most important chemical known. In industries, it is manufactured using the Contact process. It involves the use of sulfur or sulfur dioxide and water to synthesize sulfuric acid. A catalyst helps to increase the rate of the reaction in any chemical process. In the Contact process, vanadium pentoxide is used as catalyst. It speeds up the formation of sulfur trioxide from sulfur dioxide and oxygen. 2 SO 2 ( g ) sulfur dioxide + O 2 ( g ) oxygen ↔ V 2 O 5 2 SO 3 ( g ) sulfur trioxide

Below is a flow chart for the Contact process: The production of substance F is very important. Why? Give three reasons.

Sulfuric acid is one of the most important chemical known. In industries, it is manufactured using the Contact process. It involves the use of sulfur or sulfur dioxide and water to synthesize sulfuric acid. According to the flow chart, the substance F is concentrated sulfuric acid. It is made from sulfur and water in a step-by-step process. Concentrated sulfuric acid is a very important chemical and has a wide variety of applications. Sulfuric acid is used in the manufacture of synthetic fertilisers like ammonium sulfate. It is an important raw material for making plastics and fibres. It is used to make soaps and detergents. It is also used to make paints, pigments, and dyes.

Below is a flow chart for the Contact process: Copy out the flow chart, and write in the full names of the different substances.

Sulfuric acid is one of the most important chemical known. In industries, it is manufactured using the Contact process. It involves the use of sulfur or sulfur dioxide and water to synthesize sulfuric acid. In the Contact process, sulfur dioxide (substance A) and oxygen (substance B) are reacted together in the converter to form sulfur trioxide. The converter consists of beds of vanadium pentoxide (substance C), which acts as catalyst. The resulting sulfur trioxide is dissolved in concentrated sulfuric acid (substance D) to result in the formation of oleum. Oleum formed is now mixed carefully with water (substance E) to finally produce concentrated sulfuric acid (substance F). The entire process is as shown below:

E M B I B E

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 16 - Some Non-Metals and their Compounds>Checkup on Chapter 16

RoseMarie Gallagher and Paul Ingram Solutions for Chapter: Some Non-Metals and their Compounds, Exercise 10: Checkup on Chapter 16

Author:RoseMarie Gallagher & Paul Ingram

RoseMarie Gallagher Chemistry Solutions for Exercise - RoseMarie Gallagher and Paul Ingram Solutions for Chapter: Some Non-Metals and their Compounds, Exercise 10: Checkup on Chapter 16

Attempt the practice questions on Chapter 16: Some Non-Metals and their Compounds, Exercise 10: Checkup on Chapter 16 with hints and solutions to strengthen your understanding. Complete Chemistry for Cambridge IGCSE® Second Edition solutions are prepared by Experienced Embibe Experts.