F In Exams (2 page)

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Authors: Richard Benson

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In a blast furnace it is impossible for aluminum to be extracted from its ores. Why?

 

What type of attractive force or bond holds the sodium ions and chloride ions together in a crystal of sodium chloride?

 

Over the last 50 years there has been a significant change in the concentration of carbon dioxide. Give a reason for this.

 

What are the characteristics of crude oil?

 

 

Describe the chemical differences between H
2
O and CO
2
.

 

What is a vibration?

 

What is the difference between a hydrocarbon (such as ethane) and an alcohol (such as ethanol)?

 

The burning of fossil fuels that contain carbon produces a gas called carbon dioxide. Draw a “dot-and-cross” diagram to represent carbon dioxide.

 

 
Subject: Biology

What is the lowest-frequency noise that a human can register?

 

What is the highest-frequency noise that a human can register?

 

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