Question 1 What are ionic compound? Question 2 What are covalent compounds? Question 3 Define chemical bond? Question 4 Why noble gases do not react? Question 5 What are ions? Question 6 How ions are formed? Question 7 What are cations.How they are formed? Question 8 Give example of cation formation? Question 9 What are […]
Atoms and Molecules
Atoms and molecules
Question 1 Which Indian philosopher suggested that all matter is composed of ver small particles.What name was given by him to these particles? Question 2 What is law of conservation of mass?Give example? Question 3 What is meant by law of constant proportion?Give example? Question 4 Name the scientist who gave law of conservation of mass? […]
Mole concept
Question 1 Define a mole? Question 2 What is the value of Avogadro’s constant? Question 3 Define mole of an atom? Question 4 Define mole of a molecule? Question 5 Write the formula to calculate the number of moles? Mole Concept In a chemical reaction equation,it is more convenient […]
Gram molecular mass
Question 1 What is gram molecular mass? Gram Molecular mass The amount of a substance whose mass in grams is numerically equal to its molecular mass,is called gram molecular mass of that substance. The molecular mass of a substance expressed in grams is called gram molecular mass. To write gram molecular mass of a substance […]
Valency of ion
Question 1 Define the term valency? Question 2 What are monovalent ion.Give example? Question 3 What are divalent ion.Give example? Question 4 What are trivalent ion.Give example? Question 5 What do you mean by chemical formulae of a compound? Question 6 What are the steps to write chemical formulae of a compound? Question 7 What is gram […]
Ions
Question 1 What are ions? Question 2 How an ion is formed? Question 3 How a cation is formed.Give example? Question 4 How an anion is formed.Give example? Question 5 What are simple ions.Give example? Question 6 What are complex ions.Give example? Question 7 What are ionic compounds? Question 8 Define formula unit of an […]
Molecular mass
Question 1 What is a chemical formula? Question 2 Give few examples of formulae of elements? Question 3 Give few examples of formulae of compounds? Question 4 Define molecular mass? Chemical Formula A chemical formula represents the composition of a molecule of the substance in terms of the symbols of elements present in the molecule. Formulae […]
Molecules
Question 1 What is a molecule.Give example? Question 2 How do atoms usually exist? Question 3 Why atoms form molecules or ions? Question 4 Define covalent bond? Question 5 What is meant by molecule of an element? Question 6 What is meant by molecule of a compound? Question 7 Define the term atomicity? Question 8 What […]
Atomic mass
Question 1 How is the size of an atom indicated? Question 2 Define atomic mass unit? Question 3 What is the mass of hydrogen atom? Question 4 Name the element used as a standard for atomic mass scale? ATOMIC MASS OF AN ELEMENT Actual masses of the atoms of the elements are very very small. […]
Atoms and elements
Question 1 Define atoms? Question 2 What is atomic radius? Question 3 What do you mean by symbol of an element? Question 4 Name the unit in which the radius of an atom is usually expressed? ATOMS All the matter is made up of atoms. An atom is the smallest particle of an element that […]