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

Statement 1: $-273^0C$ is also known as absolute zero.
Statement 2:  $^0C = K + 273 $.

  1. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Absolute zero, temperature at which a thermodynamic system has the lowest energy. It corresponds to $−273^oC$ $ ( 0 K)$.
Celsius scale is 273 greater in value than Kelvin scale.
$^0C = K - 273$

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

$10^{3}$  stands for :

  1. milli-

  2. kilo-

  3. centi-

  4. micro-

  5. nano-
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Name and Factor :

milli- $\displaystyle  10^{-3}$
kilo- $\displaystyle  10^{3}$   
centi- $\displaystyle  10^{-2}$
micro- $\displaystyle  10^{-6}$
nano- $\displaystyle  10^{-9}$

Hence, the correct option is B.
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 can be expressed as grams per milliliter?

  1. Boiling point

  2. Rate of reaction

  3. Molecular mass

  4. Molarity

  5. Density
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Boiling point is expressed in kelvin, molecular mass in kilograms, molarity in moles per litre, rate of reaction in moles per litre per second and density in grams per litre or milliltre.

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

What is the correct unit for the following solution?

$0.5mg$ of arsenic dissolved in $1kg$ of solution. (All the symbols given are in their standard form)

  1. $w/w$
  2. $m$
  3. $M$
  4. $v/v$
  5. $ppm$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

0.5 mg of arsenic dissolved in 1 kg of solution. Both of the solute and solvent are given in terms of mass.

 Therefore, Option a is correct.

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

1 atm equals to:

  1. 1 torr

  2. 76 torr

  3. 760 torr

  4. 100 torr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
To convert an atmosphere measurement to a torr measurement, multiply the pressure by the conversion ratio. One atmosphere is equal to 760 torr, so use this simple formula to convert:

torr = atmospheres $\times$ 760
The pressure in torr is equal to the atmospheres multiplied by 760.

Hence, the correct option is $C$