Tag: matter around us

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Questions Related to matter around us

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.
$^0C = K - 273$

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.