Enter Title

Matter

100

Matter can be divided into mixtures and -------------

Pure substances

200

When an atom combines with another atom, it forms a ________

Molecule

300

A molecule containing three atoms is called a

Triatomic molecule.

400

Differentiate between elements and compounds.

Elements contain atoms of same types.

Compounds contains atoms of different types in fixed proportion.

500

Give an example for an element and a compound.

Ozone,CO2

Elements

100

How many elements have been discovered till date?

118

200

Based on chemical properties elements can be categorized into three. Name the three categories.

Metals, Non-metals and Metalloids

300

Give any two differences between metals and nonmetals with examples.

Metals are lustrous. They have a shiny surface. Metals are generally hard. Most metals are bendable. Most metals are good conductors of electricity. Most metals are good conductors of heat. Most metals are making ringing sound when struck. Gold,Silver

Non-metals are generally soft, Non-metals are non bendable, Non-metals are non ductile ,Non-metals are bad conductors of electricity, Non-metals are bad conductors of heat, Non-metals does not make any sound when they struck. Eg: Bromine, Sulphur.

400

Oxygen, hydrogen, and sulphur are examples of

Non-metals

500

What are elements? What are they made of? Give two examples

Pure substances, made of same type of atoms. Eg Aluminium

Compounds

100

Compounds and elements are pure substance. TRUE/FALSE

True

200

A compound containing one atom of carbon and two atoms of oxygen is

CO 2-Carbon dioxide

300

Write the chemical formula and name the elements present in the following compounds:

 a. Sodium chloride b. Potassium hydroxide c. Carbon-di-oxide

NaCl- Sodium and chlorine

KOH-Potassium, Oxygen and Hydrogen

CO2-Carbon,Oxygen

400

1. What are compounds? Give two examples.

A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions. H2O, NaCl

500

Classify the following as elements and compounds. Water, common salt, sugar, carbon dioxide, iodine and lithium

Water, common salt, carbon dioxide-Compounds

sugar iodine and lithium- Elements

Symbols and Formulae

100

The first letter of an element always written in -----------  letter

Capital

200

Write the symbols for the following elements and classify them as solid, liquid and gas Aluminum, carbon, chlorine, mercury, hydrogen and helium

Aluminium and Carbon-Solid

Mercury-Liquid

Chlorine, hydrogen and helium-Gas

300

Give the chemical formula for the following elements 

a. Hydrogen c. Ozone b. Nitrogen d. Sulphur

H2,O3,N2,S8

400

Calculate the atomicity of H2SO4.

7

500

Give an example for the elements derived from their Latin names

the symbol for gold is Au after its Latin name Aurum. Similarly, the symbols for copper is Cu after its Latin name Cuprum.

Random

100

The metal which is liquid at Room temperature is

Mercury

200

Non metal conducting electricity:______:: Metal conducting electricity: Copper

Graphite

300

Mercury: liquid at room temperature:: Oxygen:__________

Gas at room temperature.

400

Define the following terms with an example of each: 

Metal 

 Non-metal 

Metalloid

Metal

• Definition: A substance that is typically solid, shiny, malleable, and a good conductor of heat and electricity.
• Example: Iron (Fe) - Used in construction and manufacturing due to its strength and conductivity.

Non-metal

• Definition: A substance that lacks metallic properties, usually brittle, and a poor conductor of heat and electricity.
• Example: Oxygen (O₂) - A gas essential for respiration and combustion.

Metalloid

• Definition: A substance with properties intermediate between metals and non-metals, often semiconductors.
• Example: Silicon (Si) - Used in electronics and computer chips due to its semiconducting properties.

500

Define the following terms with an example of each:

 a. Element b. Compound

a. Element

• Definition: A pure substance made of only one type of atom.
• Example: Oxygen (O₂) - A gas consisting only of oxygen atoms.

b. Compound

• Definition: A substance made of two or more different elements chemically combined.
• Example: Water (H₂O) - A liquid formed from hydrogen and oxygen atoms bonded together.