Classify the following as elements or compounds :
iron ,iron sulphide , sulphour,chalk ,Washing soda ,sodium , carbon ,Urea

Classify the following in to elements compounds and mixtures

Classify the following substances as either being an element or a compound?

Which of the following elements is sometimes used to protect iron ?

Classify the following into elements , compounds and mixtures: Sodium , soil , sugar solution , Silver ,Cacium carbonate ,Tin , Silicin ,Coal ,Air, soap ,Methane ,Carbon dioxide ,blood

Which of the following elements contitutes a major impurity in pig iron ?

Classify the following substances into element, compound and mixture. (i) Dry ice. (ii) Sodium chloride.

(a) what is meant by (i) element (ii) compounds ,and (iii ) mixture ? Write down the names of two elements, two compounds and two mixture . (b) Classify the following into elements ,compounds and mixtues: marble ,Air Gold ,Brass,sand ,Diamond,Graphite,petroleum, common salt,sea ,-water , chalk.