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Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
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What elements do the following compounds contain ?
Sugar, Common salt
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What elements do the following compounds contain ?
Sugar, Common salt
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What are pure substances ? Give two examples of pure substances.
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What are pure substances ? Give two examples of pure substances.
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What are the two types of pure substances? Give one example of each type.
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What are the two types of pure substances? Give one example of each type.
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Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
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Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
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What is the other name for impure substances ? Give two examples of impure substances.
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What is the other name for impure substances ? Give two examples of impure substances.
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Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
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Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
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Name two solid, two liquid and two gaseous elements at the room temperature.
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Name two solid, two liquid and two gaseous elements at the room temperature.
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Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
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Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
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What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
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What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
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State two physical properties on the basis of which metals can be distinguished from non-metals.
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