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प्रश्न
Define the term: Element
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उत्तर
Element is a substance which cannot be split up into two or more simple substances by usual chemical methods of applying heat, light or electric energy; for example, hydrogen, oxygen and chlorine.
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संबंधित प्रश्न
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture
What is the difference between a pure substance and a mixture ?
Differentiate between:
Homogenous and heterogenous substances
Give two applications of chromatography.
Give two examples of Noble gases.
Name: Three different forms of carbon
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
Indicate whether the following statement is true or false:
A compound is made up of just one kind of atom
Indicate whether the following statement is true or false:
Elements are made up of compounds
Classify substances into pure and impure substances in the form of a chart or tabulation.
Complete the statement with the correct words.
Acid’s are chemicals which are _____ in taste and derived from plants and ________.
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
Write the names of elements from the following symbol:
Cd
Write an answer to the following question in your own words.
Which elements (metals and non-metals), compounds and mixtures do we use in our day-to-day life?
State five different characteristics of compounds.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
Name the process associated with the following
A fine beam of light entering through a small hole in a dark room illuminates the particles in its paths.
