Advertisements
Advertisements
Question
What is meant by a substance?
Advertisements
Solution
A substance is a kind of matter that is made up of only one type of particle (either atoms or molecules). It has a definite composition and distinct properties. A substance may be an element (e.g., oxygen, iron) or a compound (e.g., water, carbon dioxide). For example, water is a pure substance because it contains only one type of molecule, H₂O.
APPEARS IN
RELATED QUESTIONS
Which separation technique will you apply for the separation of the following?
Tea leaves from tea.
‘‘The properties of the product are different from those of the constituents''. State whether this statement best describes an element, a compound or a mixture.
How will you separate a mixture of sodium chloride and sand ?
Define the following:
Pure substance
Give two examples of the following type of mixture.
gas-gas
State whether the following statement is true or false. If false write – the correct statement.
Heterogeneous mixtures have different composition and properties throughout the mixture.
Make a fruit or vegetable salad. Give reasons why you think it is a mixture.
Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
When elements are physically mixed they form ______.
Expand LPG ______.
