Authors: Richard Benson
F In Exams (2 page)
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.
What is the lowest-frequency noise that a human can register?
What is the highest-frequency noise that a human can register?
