Tag: measurement of properties

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Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Value of Plank's constant is equal to:

  1. $6.625 \times 10^{-34}$ J. sec.
  2. $6.25 \times 10^{-34}$ J. sec.
  3. $662.5 \times 10^{-34}$ J. sec.

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Planck's constant is named after the physicist Max Planck. It links the frequency of the electromagnetic wave of a photon to its amount of energy.

         $E=hv$
$h\rightarrow$ planck's constant $=6.625\times 10^{-34} J.sec.$

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Temperature is a measure of :

  1. the average kinetic energy of the particles in a substance.

  2. the average potential energy of the particles in a substance.

  3. the highest amount of kinetic energy the particles in a substance have.

  4. the number of particles a substance has.

  5. the amount of heat a substance has.

Reveal answer Fill a bubble to check yourself
A,E Correct answer
Explanation

Temperature is a measure of the average kinetic energy of the particles in a substance. 


As the average kinetic energy of the particles in a gas is proportional to the temperature of the gas.

Hence the correct options are A and E.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Which units of pressure are needed if you are going to use 0.0821 as your ideal gas constant?

  1. Atmospheric

  2. Torr

  3. Psi

  4. mmHg

  5. Pascals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gas constant = $0.0821 $  $L atm K^{−1} mol^{−1}$


atm ( Atmospheric unit is used )

Hence the correct option is A.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Which of the following measures pressure?

  1. Barometer

  2. Thermometer

  3. Pycnometer

  4. Parameter

  5. Pressometer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems and frontal boundaries.