FBISE 9th Class Chemistry Chapter 1 Fundamentals of Chemistry Short Questions Answers
FBISE 9th class Chemistry Chapter 1 Fundamentals of Chemistry Short Questions with answers are combined for all 9th class(Matric/ssc) Level students. Here You can prepare all Chemistry Chapter 1 Fundamentals of Chemistry short question in unique way and also attempt quiz related to this chapter. Just Click on Short Question and below Answer automatically shown. After each question you can give like/dislike to tell other students how its useful for each.
Class/Subject: 9th Class Chemistry
Chapter Name: Fundamentals of Chemistry
Board: Federal Board
Helpful For:
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FBISE 9th Class Chemistry Chapter 1 Fundamentals of Chemistry Short Questions Answers
Define Chemistry?
Chemistry is the branch of science which deals with the composition, properties, chemical changes in matter, and the law and principles, which govern these changes.
Define Industrial Chemistry?
The branch of chemistry that deals with the methods and use of technology in the large-scale production of useful substances is called Industrial Chemistry.
Write down the main postulates of Dalton’s atomic theory?
i. All elements are composed of tiny indivisible particles called atoms.
ii. Atoms of a particular element are identical. They have the same mass and same volume.
iii. During chemical reactions atoms combine or separate or re-arrange. They combine in simple ratios.
iv. Atoms can neither be created nor destroyed.
Define Element?
An element is a substance that’s all the atoms have the same atomic number. A substance that cannot be converted to another simpler substance is called an element.
Define mixture?
An impure substance that contains two or more pure substances that retain their chemical characteristics is called a mixture.
What is a Heterogeneous mixture?
A mixture that consists of two or more visible different components is called a heterogeneous mixture.
Define atomic number?
The number of protons in the nucleus of an atom is known as its atomic number.
Define mass number?
The total number of protons and neutrons in an atom is known as its mass number.
Define Physical Chemistry?
The branch of chemistry that deals with the laws and theories to understand the structure and changes of the matter is called physical chemistry.
Define Organic Chemistry?
The branch of chemistry that deals with the substances containing carbon is called organic chemistry.
Define Inorganic chemistry?
The branch of chemistry that deals with the elements and their compound except organic compounds is called inorganic chemistry.
Define Nuclear Chemistry?
The branch of chemistry that deals with the changes that occur in atomic nuclei is called Nuclear Chemistry.
Define Environmental Chemistry.
The branch of chemistry that deals with the chemicals and toxic substances that pollute the environment and their adverse effects on human beings is called Environmental Chemistry.
Define Analytical Chemistry?
The branch of chemistry that deals with the methods and instruments determining the composition of matter is called Analytical Chemistry.
Define relative atomic mass.
The mass of an atom of an element relative to the mass of C-12 is called relative atomic mass.
Define empirical formula with example.
The simplest type of formula which shows the simplest whole-number ratio of atoms present in a compound is called the empirical formula. e.g. glucose has the simplest ratio of 1:2:1 of carbon, hydrogen, and oxygen respectively. Hence its empirical formula is CH2O.
Define Molecular mass?
Molecular mass is the sum of atomic masses of all atoms present in the molecule.
Define formula mass.
The sum of the atomic masses of all atoms in the formula unit of a substance is called formula mass.
Define ion?
Ion is a charged species formed from an atom of chemically bonded groups of atoms by adding or removing electrons.
Differentiate between Cations and Anions.
Cations: Positively charged ions are called Cations.
Anions: Negatively charged ions are called Anions.
Define molecular ion?
When a molecule loses or gains electrons, the resulting species is called a molecular ion.
Define free radicals?
A free radical is an atom, which has an unpaired electron and bears no electrical charge.
What is a Homogeneous mixture?
A mixture that has a uniform composition throughout is called a Homogeneous mixture.
Define Bio Chemistry?
It is the branch of chemistry in which we study the structure, composition, and chemical reactions of substances found in living organisms.
What is the matter?
Anything that has mass and occupies space is called matter. Matter can exist in any of the three states; solid, liquid, or gas.
What is valency?
The combining capacity of an element with other elements is called valency. For example valency of carbon is 4.
What is the molecular formula?
The formula of molecular substances that shows an actual number of atoms of each element present in a molecule of that substance is called the molecular formula.
What is Avogadro’s number?
Avogadro’s number is a collection of 6.02 x 1023 particles. It is represented by the symbol ‘NA’. Hence, the 6.02 x 1023 number of atoms, molecules, or formula units is called Avogadro’s number.
Define a mole.
A mole of defined as the amount (mass) of a substance that contains 6.02 x 1023 number particles (atoms, molecules, or formula units). It is abbreviated as ‘mol’ e.g. 6.02 x 1023 carbon atoms = 1 mole of carbon.
Define Symbol?
An abbreviation for the name of the element is called a symbol.
What is an isotope?
Atoms of an element having different mass numbers but the same atomic numbers.
Define Chemical reaction.
Representation of an element or a compound in terms of symbols is called chemical formula.
What is the gram atomic mass of S-atoms?
Mass of 1 mole of S-atoms = 32g
Define gram formula mass?
The formula mass of a substance expressed in grams is called gram formula mass.
Define gram molecular mass?
The molecular mass of a substance expressed in grams is called gram molecular.
