Question

answer fill in the blanks​

Answer 1

Conductor

Ductility

Hydrogen

5 bromine

reactive

harmful

metal

Answer 2

$\mathfrak{\large{\underline{\underline{Answer :-}}}}$

1. Metals are good conductor of heat and electricity.

• Metals have property of conducting heat, this property of metals is known as Thermal Conductivity.

• The property of metal which allows them to conduct electricity is known as electrical conductivity. An exception is Graphite which although is a non metal is a good conductor of electricity.

• Metals are known as good conductors of heat and electricity while non metals are known as bad conductors of heat as well as poor conductors of electricity.

$\rule{300}{1.5}$

2. The property by virtue of which metals can be drawn into thin foils is called malleability.

• Metals posses a property known as malleability which is the ability to be beaten into sheets most of the metals are malleable.

• Gold and Silver are considered to be the most malleable.

• Non-metals when beaten, break into little pieces, thus they cannot be considered malleable.

$\rule{300}{1.5}$

3. Hydrogen gas is produced when metals react with acids.

• Hydrogen gas is liberated when metals react with dilute acids.

• Metals react with dilute hydrochloric acid to form chloride salt, with dilute nitric acid to form nitrate salt and with dilute sulphuric acid to form sulphate salts.

$\rule{300}{1.5}$

4. Generally, non Metals have Negative Valency.

$\rule{300}{1.5}$

5. Bromine is a liquid non metal.

• Non metals exists as solids, liquids and gases.

• Sulphur, Phosphorus and Carbon are solid at room temperature.

• Bromine exists as a liquid while oxygen, nitrogen, chlorine exist as gases at room temperature.

$\rule{300}{1.5}$

6. Zinc is more reactivate than Copper.

According to the Metal Reactivity Table -

$\begin{tabular}{|c|c|}\cline{1-2} Potassium & K \\\cline{1-2}\ Calcium & Ca \\\cline{1-2}\ Magnesium & Mg \\\cline{1-2}\ Aluminium & Al \\\cline{1-2}\ Carbon & C \\\cline{1-2}\ Zinc & Zn \\\cline{1-2}\ Iron & Fe \\\cline{1-2}\ Tin & Sn \\\cline{1-2}\ Lead & Pb \\\cline{1-2}\ Hydrogen & H \\\cline{1-2}\ Copper & Cu \\\cline{1-2}\ Silver & Ag \\\cline{1-2}\ Gold & Au \\\cline{1-2}\ Platinum & Pt \\\cline{1-2}\end{tabular}$

• Potassium being the most reactive is on the top. Zinc is is placed above copper.

• Which means zinc is more reactive than copper.

$\rule{300}{1.5}$

7. Phosphorus is a very reactive non metal.

$\rule{300}{1.5}$

8. Objects which produce sound when are beaten are known as sonorous.