1st Year Chemistry Guess Paper - 1st year chemistry important Question
In this Page i am going to telling you 1st Year Chemistry Guess Paper 1st year chemistry important Question i collect this questions from all board past paper 1st year chemistry guess paper for lahore board Faisalabad board sargodha board multan board DG Khan Board sahiwal board

1st Year Chemistry Guess Paper - 1st year chemistry important Question 

1st year chemistry Important Question and Guess paper  for Sargodha board,lahore board, faisalabad board,multan board,sahiwal board , bahawalpur board , DG KHAN Board
In this post i am going to tell you most important question of 11th class chemistry Short Question Guess

1st year chemistry Guess

Chapter 5 Chemistry Important Question

72)How neutrons discovered

73)What is orbitals

74)What is bohr atomic model , give postulates

75)What were reason for production of positive rays

76)Properties of Positive Rays

77)What is Hund Rule

78)What is Moseley Law

More Question from exercise

Chapter 6 Chemistry Important Question

79)What is VBT AND MOT

80)Bond distance is compromise distance between two atoms.explain

81)Why atomic radius is greater than cationic radius

82)Long pair of electrons on an atom occupies more space.give reasons

83)Sigma bonds is stronger than Pi bonds.why

84)What is coordinate covalent bonds

85)What is ionization energy

86)What is electronegativity

87)What is coordinate covalent bond

Chapter 7 Chemistry Important Question

88)What is system and surrounding

89)What is exothermic and endothermic reaction

90)What is state Function

91)Burning of candle is a spontaneous process why

92)What is enthalpy of combustion

93)What is thermochemical reaction

94)What is enthalpy of formation

95)Define Born Haber cycle and littice energy

96)What is law of conservation of energy.

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1st year chemistry Important Question and Guess paper  1st year chemistry Important Question and Guess paper  for Sargodha board,lahore board, faisalabad board,multan board,sahiwal board , bahawalpur board , DG KHAN Board
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In this post i am going to tell you 1st year Chemistry Guess Paper - 11th Class Chemistry Important Question 2020 And Past Paper Important Question

1st year Chemistry Guess Paper - 11th Class Chemistry Important Question

Chapter 1 Chemistry Important Question

1)What is yield ? Actual Yield usually less than theoretical yield Why?

2)Deference between atom and molecule?

3)Define ion and give two examples

4)What is deference between homoatomic and hetroatomic Molecule Give Example?

5)Define limited reactant?

6)Give steps involved to identify a limited reactant ?

7)Write Two Assumption of stoichiometry  ?

8)MG Heavier than that of carbon atom why?

9)Define Atomic mass unit,Give its value in grams?

10)Deference between Empirical And Moleculer Formula?

11)What is mass Spectrum?

12)What are Main points or steps for determination of molecular formula?

13)Define Atomicity

14)What is percentage yield?

15)Deference between actual yield and theoretical yield?

16)What is Mole and molar volume?

Chapter 2 Chemistry Important Question

Chapter 3 Chemistry Important Question

What are enzymes  Characteristics of enzymes structure and composition of enzymes

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What are enzymes

Characteristics of enzymes structure and composition of enzymes
What is enzymes?

Definition of enzymes?

enzymes are biologically active proteins and are called biological catalysts they speed up a chemical reaction without being consumed during the reaction

Structure and Composition of enzymes

Enzymes are composed of hundreds of amino acids.
enzymes are globular protein i.e amino acids are joined and coiled to form a globular structure.
Enzymes are three dimensional globular protein
Example of enzymes
Sucrase ,diastase , cellulase , pepsin , trypsin are some examples of enzymes

Characteristics of enzymes

1) Structure.

All of the enzymes are 3 dimensional globular proteins. They retain their structure during and after the chemical reaction.

2) biocatalysts

Enzymes are biological catalysts as they accelerate a chemical reaction aur rate of a chemical reaction without being used up during the chemical reaction

3) efficiency

each enzyme molecule has the ability to change or transform 100 to 1000 substrate molecules into products is Second

@ so are single exam can break Dawn 10 power 1,00,000 molecules at a time

4) specificity

enzymes are specific in their action generally a single enzyme catalyzes a specific or particular Substrate.

5) sensitivity

Enzymes are also sensitive to specific environment change for example :
I)PH
enzymes work only on specific pH for example pepsin in acidic PH and Lipases in basic PH,
ii) temperature
at specific temperature their efficiency increase. While at low temperature enzyme activity is also reduce . increasing temperature can be nature or kill the answer too.

6) Assistency

Enzymes equired certain co-factors for their proper functioning

7) activation energy

E A is the amount of energy required to activate the molecules and change them into products. enzymes lower the of the reactions so that a chemical reaction occurs more speedly and with the use of less energy

8) damaging effects

some enzymes are damaging if they become active at the wrong place
For example pepsin is a protein digesting enzyme it can destroy a cell internal structure. So it is produced is an inactive form pepsinogen by the cheief cell of stomatch in clause in the membrane bonded bodies for lysosomes.

9) attachment

Most enzymes do not clot in in cytoplasm but are attached to the membrane in the cell for exaample chloroplast etc


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Characteristics of enzymes Biology notes What are enzymes

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Importance of carbon

Carbon is the basic element of organic components. due to its unique properties carbon has Central position in the life. Some important properties of Carbon are as follows

1.Tetravalent

Carbon is tetravalent it can react with many other atoms for radical to form covalent Bonds

2.Covalent bond

Covalent Bond are formed when two or more atoms complete their electron shell by sharing electrons.

3.Stability

when carbon atom combines with four atom or radicals, the four bonds are range symmetrically in a tetrahedron. The result is a stable configuration. due to stability of C, it is favorable element for the synthesis of complicated cellular materials

4.Macromolecules

carbon can form large Complex macromolecules such as cellulose ,fats, proteins etc. these are generally in soluble in water these large molecules are used for following purpose:

i) cell structure
They form cell structures like cell wall

ii) story of small molecules
Macromolecules serve as Storage for small molecules like glucose, amino acids ,fatty acid etc


5.Micro molecules

micro molecules such as glucose amino acids fatty acids are used for the following purpose

I)source of energy

Small molecule act as a a source of energy some small molecules are very unstable and immediately broken Dawn to release energy (e.g ATP)
Such a substance is immediate source of energy for cell metabolism

ii) building blocks

Some molecules also act as subunits To bullet macromolecules

6.C bonding

C - C Bond
carbon atoms can combine other carbon atoms to form stable, branched or unbranched chains or rings. C-c bonding form a skeleton of organic molecule
Few examples are as follows:

Carbon with other elements

Carbon combine with H,O,N,P and S etc. As a result a large variety of organic compounds is formed

C-h Bond

C h bond is the potential source of chemical energy for all cell activities.

C - o Bond

the complex carbohydrates molecules become stable due to Sea of association in the glycosidic linkage.

C - N Bond
Carbon combines with nitrogen in amino acid linkages to form peptide bonds as result proteins are form which have various structures and functions

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