(02.04 MC) Gina predicts that one really large cube of sugar will dissolve faster than the same amount of sugar in several medium sized cubes. She thinks that bec
only one larger cube, it has more surface area and will dissolve faster than the several medium-sized cubes. What is the best assessment of Gina's prec
points)
Gina is correct since there is only one cube, it has more surface area and will dissolve faster than the medium sized cubes.
Gina la correct it takes less time for one larger object to dissolve than many objects, and larger objects have a gher temperature than smaller objects,
Gina is incorrect it will take the same time for the large and medium stred sugarcubes to dissolve. Temperature and stirring attest dissolving rates,
Gina is incorrect. The larger sugar cube will dissolve slower because it has less surface area and the water cannot easily get inside of the cube to dissolve it.
Question 3

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

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the answer to this question is 3.