Chemical Formulae and Chemical Equations

Define oxidation number.

What is a chemical equation? Why it should be balanced?

The compound with minimum atomicity should be balanced first in a chemical reaction.

What is periodic table of elements?

What is the name of the compound with the formula NaF?

What are the spectator ions in the equation,

$2{\mathrm{Na}}^{+}\left(\mathrm{aq}\right)+{{\mathrm{SO}}_4}^{-2}\left(\mathrm{aq}\right)+{\mathrm{Ba}}^{+2}\left(\mathrm{aq}\right)+2{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)\to {\mathrm{BaSO}}_4\left(\mathrm{s}\right)+2{\mathrm{Na}}^{+}\left(\mathrm{aq}\right)+2{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$

Write a brief note on spectator ions.

Chemical formula of ferric (III) chloride is ${\mathrm{FeCl}}_2$.

Write the chemical formula of ferric (III) chloride.

What are chemical equations? How can we write chemical equations? Explain with examples.

Define the following term.

Chemical equation

What do you understand by a chemical equation?

State whether the following statement is True or False. Correct the false statement.

A chemical reaction is always represented using chemical formulae and symbols.

State whether the following statement is True or False. Correct the false statement.

The reactants and products are separated by an arrow.

State whether the following statement is True or False. Correct the false statement.

In a chemical equation, the reactants of a chemical reaction are written on the left-hand side.

Which sign is used to indicate the direction of a chemical reaction?

An element 'A' has valency 1 and an element 'B' has valency 2. Write the formula of the compound formed by 'A' and 'B.'

Write chemical formulae of the following compounds.

Potassium hydroxide

Write chemical formulae of nitric acid.

$$\begin{gathered} \mathrm{A}={\mathrm{HNO}}_2 \\ \mathrm{B}={\mathrm{HNO}}_3 \\ \mathrm{C}=\mathrm{H}{\left({\mathrm{NO}}_3\right)}_2. \end{gathered}$$

Enter your correct answer as A, B or C.

Write chemical formulae of hydrogen sulphide.

$$\begin{gathered} \mathrm{A}={\mathrm{H}}_2\mathrm{S} \\ \mathrm{B}={\mathrm{H}}_2{\mathrm{S}}_2 \\ \mathrm{C}={\mathrm{H}}_3\mathrm{S} \end{gathered}$$

Enter your correct answer as A, B or C.