ANSWERS FOR QUIZ ON HEAT AND ACIDS BASES AND SALTS

HEAT

1. The SI unit of specific heat is_____________ (J/kg - K)

2. _____________ flows from a body at higher temperature to a body at lower temperature. (HEAT)

3. _____________ is a cooling process. (EVAPORATION)

4. An object ‘A’ at 100C and another object ‘B’ at 10K are kept in contact, then heat will flow from      _________ to ___________ (A TO B)

5. The latent heat of fusion of ice is _____________ ( 80 cal / g)

6. Temperature of a body is directly proportional to _____________( KINETIC ENERGY) 

7. According to the principle of method of mixtures, the net heat lost by the hot bodies is equal to     _____________ by the cold bodies. ( NET HEAT GAINED )

8. The sultryness in summer days is due to _____________ (HUMIDITY)

9. 1 calorie = ______ joules. ( 4.2) 

10. Ice floats on water because _____________( LOW DENSITY) 

11. Heat is a form of ____________ ( ENERGY)

12. Heat energy transferred from the _______ body to the ______ body. ( HOT , COLD) 

13. The S.I. unit of heat is ____________  ( joule ,J)

14. C.G.S. unit of heat is ________ ( calorie)

15. ____________ is used as a coolant. ( WATER)

16. Temperature measured on Kelvin scale is called __________ temperature.  ( ABSOLUTE)

17. 1cal/g-oC = _________ J/kg – k.  (4.2 ×103)

18. The water droplets condensed on window panes surfaces are known as ___________ ( DEW)

19. ____________ is a warming process.  ( CONDENSATION)

20. Evaporation is a _________ phenomenon. ( SURFACE)

ACIDS  BASES  AND SALTS

1. --------------- taste is a characteristic property of all acids in aqueous solution.     (SOUR)

2. Acids react with some metals to produce --------------- gas. ( HYDROGEN )

3. Because of aqueous acid solutions conduct electricity, they are identified as --------------- (CONDUCTORS)

4. Acids react with bases to produce a --------------- and water.(SALT)

5. Acids turn methyl orange into --------------- colour.(RED)

6. Bases tend to taste --------------- and feel ---------------(BITTER, SOAPY)

7. Like acids, aqueous basic solutions conduct ---------------, and are identified as -------------(ELECTRICITY, CONDUCTORS)

8. Bases react with --------------- to produce a salt and ---------------( ACIDS, WATER)

9. Bases turn phenolphthalein into --------------- colour.(PINK)

10. In neutral solution litmus colour is ---------------(GREEN)

11. Substances whose odour changes in acidic or basic media are called ---------------(OLFACTORY INDICATORS)

12. Acid + Base → Salt + ---------------(WATER)

13. Chemical formula for lime water is ---------------(Ca(OH)2)

14. Metal oxides are --------------- in nature.(BASIC)

15. The process of dissolving an acid or a base in water is an --------------- process.(EXOTHERMIC- AS HEAT EVOLVES)

16. Mixing an acid or a base with water is called ---------------(DILUTION)

17. --------------- is a mixture of several indicators.(UNIVERSAL INDICATOR)

18. A scale for measuring Hydrogen ion concentration in a solution is called(pH)

19. The pH of neutral solution is ---------------(7)

20. --------------- introduced the concept of pH.( SORENSEN)