Question 131iThis table shows the mass of one atom for five chemical elements-Use it to answer the questions given- - - - - Titanium 7-95 - 10-26- Lead 3-44 - 10-25- Silver 1-79 - 10-25- Lithium 1-15 - 10-26- Hydrogen 1-674 - 10-27- -Which is the heaviest element-

Arrangement of masses of atoms in same power of 10 is given by Titanium=7.95 × 10^ 26 Lead=34.4 × 10^ 26 Silver=17.9 × 10^ 26 Lithium=1.15 × 10^ 26 Hydrogen=0 ...

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Standard VIII

Chemistry

Atomic Mass and Mass Number

Question 131i...

Question

Question 131(i)

This table shows the mass of one atom for five chemical elements.
Use it to answer the questions given.
$\begin{matrix} E l e m e n t s & M a s s o f a t o m (k g) T i t a n i u m & 7.95 \times 10^{- 26} L e a d & 3.44 \times 10^{- 25} S i l v e r & 1.79 \times 10^{- 25} L i t h i u m & 1.15 \times 10^{- 26} H y d r o g e n & 1.674 \times 10^{- 27} \end{matrix}$
Which is the heaviest element?

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Solution

Arrangement of masses of atoms in same power of 10 is given by
Titanium= $7.95 \times 10^{- 26}$
Lead= $34.4 \times 10^{- 26}$
Silver= $17.9 \times 10^{- 26}$
Lithium= $1.15 \times 10^{- 26}$
Hydrogen= $0.1674 \times 10^{- 26}$
Thus, we have
34.4 > 17.9 > 7.95 > 1.15 > 0.1674
Lead is the heaviest element.

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Question 131(iii)

This table shows the mass of one atom for five chemical elements.
Use it to answer the questions given.
$\begin{matrix} E l e m e n t s & M a s s o f a t o m (k g) T i t a n i u m & 7.95 \times 10^{- 26} L e a d & 3.44 \times 10^{- 25} S i l v e r & 1.79 \times 10^{- 25} L i t h i u m & 1.15 \times 10^{- 26} H y d r o g e n & 1.674 \times 10^{- 27} \end{matrix}$
List all the five elements in order from lightest to heaviest.

Question 131(iii)

Question 131(ii)

Question 146(i)

The given table shows the crop production of a state in the year 2008 and 2009. Observe the table given below and answer the given questions.
$\begin{matrix} C r o p & 2008 H a r v e s t (H e c t a r e) & I n c r e a s e / D e c r e a s e (H e c t a r e) i n 2009 B a j r a & 1.4 \times 10^{3} & - 100 l o w a r & 1.7 \times 10^{6} & - 440000 R i c e & 3.7 \times 10^{3} & - 100 W h e a t & 5.1 \times 10^{5} & + 190000 \end{matrix}$
For which crop(s) did the production decrease ?

Question 146(i)

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Question 131(i) This table shows the mass of one atom for five chemical elements. Use it to answer the questions given. ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27 Which is the heaviest element?

Arrangement of masses of atoms in same power of 10 is given by Titanium=7.95×10−26 Lead=34.4×10−26 Silver=17.9×10−26 Lithium=1.15×10−26 Hydrogen=0.1674×10−26 Thus, we have 34.4 > 17.9 > 7.95 > 1.15 > 0.1674 Lead is the heaviest element.