Tag: general introduction: importance and scope of chemistry

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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

Convert $-679^{\circ}$ F to celsius.

  1. 412.24
  2. $-$395

  3. 963
  4. $-$400
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know,    $\boxed { {  }^{ 0 }C=\left( {  }^{ 0 }F-32 \right) \times \frac { 5 }{ 9 }  } $

                   $\swarrow $               $\searrow $
temp in ${  }^{ 0 }C$                       temp in $F$.
${  }^{ 0 }C=\left( -679-32 \right) \times \dfrac { 5 }{ 9 } $
${  }^{ 0 }C=-395$
$\therefore $  temperature in ${  }^{ 0 }C$  u $-{ 395 }^{ 0 }C$.

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 temperature of water in kelvin if the water is at $44^{\circ}C$ ?

  1. 330

  2. 317

  3. 229

  4. 230
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Temperature in$ K$ = Temperature in $^{\circ}C + 273$


                                     = $44^{\circ}C + 273$

                                    = $317 K$.

So, 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

In the metric system, the prefix kilo-means :

  1. $10^0$
  2. $10^{-1}$
  3. $10^{-2}$
  4. $10^2$
  5. $10^3$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In the metric system, the prefix kilo-means $\displaystyle  10^3$. 
For example, 1 kg is equal to $\displaystyle  10^3 g$. 
1 km is equal to $\displaystyle  10^3 $ m.

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 of hot red iron is $58^{\circ}$ F. If the temperature increases by $20^{\circ}$ F, what is its temperature now in kelvin?

  1. 298.5

  2. 300

  3. 273
  4. $-$80
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Temperature after heating $= 58 + 20 = 78^0F$
Temperature in Kelvin $= (F -  32) \div 1.8 + 273$
                                    $= (78-32) \div 1.8 +273$
                                    $= 46 \div 1.8 + 273$
                                    $= 25.55 + 273$
                                    $= 298.5$ K

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.
$^0C = K - 273$