A scientist is conducting an experiment to determine the melting point of a substance. They find that the melting point is about 160 0C higher than they expected based on the size and molecular mass of the compound. What would explain their results? Select all correct answers. a. The substance is nonpolar, so London dispersion forces exist
b. Dipole-induced dipole attractions strongly hold the molecules together
c. Temporary dipole-induced attractions form in the solid where it melts
d. The substance is strongly polar, so dipole-dipole attractions exist
e. Hydrogen bonding strongly holds the molecules together in the solid state

d.) circle motion requires a force to give it a centripetal acceleration.

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.

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph