Vaishali Gupta, Shalini Bajaj and, Supriya D.Sheshadri Solutions for Exercise 4: Exercises

Type of change in which a new substance is produced.

The process by which a compound is converted into its crystal.

What is an atom ?

Identify the elements represented by the following symbols: $\mathrm{Ba}$, $\mathrm{Fe}$, $\mathrm{Zn}$, $\mathrm{S}$, $\mathrm{Au}$

Write the chemical symbols for the following elements: Aluminium, Iodine, Fluorine, Mercury, and Potassium.

Represent a molecule of the compound water using chemical symbols / formulae:

$\mathrm{A}:{\mathrm{H}}_2\mathrm{O}, \mathrm{B}:{\mathrm{CO}}_2, \mathrm{C}:{\mathrm{NH}}_3$ (Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Represent four molecules of the compound carbon dioxide using chemical symbols / formulae. 

$$\begin{gathered} \mathrm{A}) 4{\mathrm{H}}_2\mathrm{O} \\ \mathrm{B}) 4{\mathrm{CO}}_2 \\ \mathrm{C}) 2{\mathrm{CO}}_2 \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Name the elements in the following compounds:

${\mathrm{CO}}_2, \mathrm{NaCl}, {\mathrm{CH}}_{4,} \mathrm{MgO}$