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All bacteria have flagella.
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Circle the odd one out. Give reason for your choice
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What kind of a change is associated with decaying of a plants?
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What happens when cane sugar is strongly heated? Mention any two changes in it.
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______ gas causes tears in our eyes while cutting onions.
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NPK are the primary nutrients for plants.
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In washing machines, water is squeezed out from clothes and they are dried. This method is called ______.
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The principle of ______ is used in washing machines.
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The changes in which new substance with new chemical properties are formed are ______.
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Chemical change is a temporary change.
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Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
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Silver articles turning black: ______:: Boiling of H2O: physical change ______.
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______ change results in the change of the substance.
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The percentage composition of Nitrogen in Ureas is ______.
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Burning of paper is the best example of ______ change.
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Water boiling into water vapour is an example of chemical change.
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Chemists identify gypsum as a natural indicator.
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The water we drink is a combination of hydrogen and oxygen.
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Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
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Analogy:
H2O: Water:: NaCl: ______.
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