Exploring the World of Chemistry

What is the chemical symbol for water?

• H2O3

• O2H

• H2O2

• H2O

What are the three states of matter?

• plasma, vapor, foam

• solid, liquid, gas

• solid, liquid, plasma

• gas, liquid, crystal

What is the process of a solid turning into a liquid called?

• Freezing

• Melting

• Condensation

• Sublimation

What is an element?

• An element is a pure substance made of only one type of atom.

• An element is a type of molecule made of two or more atoms.

• An element is a mixture of different atoms.

• An element can be broken down into simpler substances.

The most abundant metal present in the earth's crust:

• Copper
• Iron
• Zinc
• Aluminum

A metal with melting point less than 50 C is: -

• Iron
• Copper
• Gallium
• Aluminum

A metalloid used to make glass is :-

• Copper
• Aluminum
• Iron
• Silicon

The colour of rust which is hydrated oxide of iron is :-

• Bright yellow
• Deep blue
• Pure white
• Reddish-brown

Name a metal which is: -

(i) Brittle

(ii) the best conductor of electricity

• Iron for brittle
• Copper for conductor of electricity

• Gold for best conductor of electricity and aluminium for brittle

• Tungsten for brittle; Silver for best conductor of electricity.

A metal which is neither ductile nor malleable is: -

• Cast iron
• Gold
• Copper
• Aluminum