Advertisements
Advertisements
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Concept: undefined >> undefined
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Oxygen is a ______ in respiration.
Concept: undefined >> undefined
Advertisements
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Concept: undefined >> undefined
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
Concept: undefined >> undefined
Explain by writing a word equation.
Respiration is a chemical change.
Concept: undefined >> undefined
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Concept: undefined >> undefined
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Concept: undefined >> undefined
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Concept: undefined >> undefined
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Concept: undefined >> undefined
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Sodium chloride
Concept: undefined >> undefined
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Concept: undefined >> undefined
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Concept: undefined >> undefined
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Concept: undefined >> undefined
The region in a sound wave, with higher pressure and density, is called ______ and that with low pressure and density is called ______.
Concept: undefined >> undefined
Medium is ______ for generation of sound.
Concept: undefined >> undefined
The total number of compressions and rarefactions produced per second in a sound wave is 1000. The frequency of the sound wave is __________.
Concept: undefined >> undefined
Different sound notes have different ______.
Concept: undefined >> undefined
How are different sound notes generated in musical instruments like guitar, which uses strings for sound generation, and flute, which uses blown air for sound generation?
Concept: undefined >> undefined
How is sound produced in a human larynx and a loudspeaker?
Concept: undefined >> undefined
Match the following:
| Human larynx | Vibrations of metal arms |
| Loudspeaker | Vibrations in air column |
| Jal-Tarang | Vibrations in vocal cords |
| Tuning fork | Vibrations in strings |
| Sitar | Vibrations of screen |
Concept: undefined >> undefined
