1.4 Which atom has twice as many neutrons as protons?   Right-click on the button to open the data booklet in a new tab.       

1.22 Water for human use is treated by filtration then chlorination. Which uses do not need water of this quality?   1 water for cooling in industry 2 water for flushing toilets in the home 3 water for drinking

1.21 A metal has the following properties.   ● It does not react with cold water. ● It reacts with dilute hydrochloric acid. ● It cannot be extracted from its oxide using carbon. Between which two metals in the reactivity series should it be placed?

1.12 An aqueous solution of copper (II) sulphate was made by adding excess copper (II) oxide to dilute sulphuric acid. The mixture was heated, stirred, and then filtered.   Right-click on the button to open the data booklet in a new tab.        What was the pH of the acid before adding the copper (II) oxide and of the solution after filtration?     pH of acid before adding copper (II) oxide pH of solution after filtration A greater than 7 7 B greater than 7 less than 7 C less than 7 7 D less than 7 greater than 7

1.2 Which method will be most suitable for the separation of sand and oil?

The DASH diet plan was devised to prevent  

The feeling of satisfaction resulting from consumption of a meal is termed  

Research has shown that the risk for neural tube defects is lowered by taking supplements of  

In what chief capacity does vitamin K function?  

Keratinization is the result of