Richard Harwood and Ian Lodge Solutions for Chapter: Chemical Reactions, Exercise 5: Exercise 4.5

Author:Richard Harwood & Ian Lodge

Richard Harwood Chemistry Solutions for Exercise - Richard Harwood and Ian Lodge Solutions for Chapter: Chemical Reactions, Exercise 5: Exercise 4.5

Attempt the free practice questions on Chapter 4: Chemical Reactions, Exercise 5: Exercise 4.5 with hints and solutions to strengthen your understanding. Cambridge IGCSE Chemistry Workbook 4th Edition solutions are prepared by Experienced Embibe Experts.

Questions from Richard Harwood and Ian Lodge Solutions for Chapter: Chemical Reactions, Exercise 5: Exercise 4.5 with Hints & Solutions

MEDIUM
Upper Secondary-IGCSE
IMPORTANT

The heat pad contains iron powder and water absorbed within the pad. While sealed, the rusting reaction cannot take place. What further reactant is needed which only comes into play when the sealed packaging is opened?

MEDIUM
Upper Secondary-IGCSE
IMPORTANT

Rust is hydrated iron (III) oxide. What is the chemical formula of iron (III) oxide?

A: Fe2O4B: Fe2O2C: Fe2O3

(Enter your correct answer as A, B or C)

 

MEDIUM
Upper Secondary-IGCSE
IMPORTANT

Complete the equation for the formation of rust.

__Fe + __O2 +2xH2O __Fe2O3.xH2O

MEDIUM
Upper Secondary-IGCSE
IMPORTANT

The hot pad also contains salt. Why is this present as a component of the reacting mixture? 

EASY
Upper Secondary-IGCSE
IMPORTANT

Ammonium nitrate used in cool packs; give another use of it.

MEDIUM
Upper Secondary-IGCSE
IMPORTANT

Give one advantage and disadvantage of the instant cool pack.

MEDIUM
Upper Secondary-IGCSE
IMPORTANT

Cool packs can be used to keep vaccines and other medicines cool in hot climates. A temperature of 5°Cis usually required. Devise an experiment to discover how much ammonium nitrate and how much water would have to be used to produce the temperature of 5°Cneeded to keep a vaccine cool in hot desert conditions.