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diff --git a/3535/CH1/EX1.1/Ex1_1.sce b/3535/CH1/EX1.1/Ex1_1.sce
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+//Chapter 1, Example 1.1, Page 21
+clc
+clear
+//Find Atomic weight of Boron
+I10 = 0.199 // Isotopic abundance of B10 (Value used in question is wrong)
+A10 = 10.012937 //Atomic weight of B10
+I11 = 0.801 // Isotopic abundance of B11
+A11 = 11.009306 //Atomic weight of B11
+//Calculation
+W = (I10*A10)+(I11*A11)
+printf("The atomic weight of Boron = %f",W);
+
+//Answers may vary due to round off error
diff --git a/3535/CH1/EX1.2/Ex1_2.sce b/3535/CH1/EX1.2/Ex1_2.sce
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+//Chapter 1, Example 1.2, Page 22
+clc
+clear
+//Find number of 10B molecules in 5g of Boron
+m = 5 //g
+Na = 0.6022*10**24 //atoms/mol
+AB = 10.811 //Atomic weight of 10B , g/mol
+NB = (m*Na)/(AB)
+printf("The number of Boron atoms = %e atoms",NB);
+
+//Answers may vary due to round off error
diff --git a/3535/CH1/EX1.3/Ex1_3.sce b/3535/CH1/EX1.3/Ex1_3.sce
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index 000000000..dbf7ebbcb
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+//Chapter 1, Example 1.3, Page 22
+clc
+clear
+//Estimate the mass on an atom of U 238. From Eq. (1.3)
+//Calculating the approximate weight
+Mapprox = 238/(6.022*10**23)
+//Calculating the precise weight
+M = 238.050782/(6.022142*10**23)
+printf("The approximate mass on an atom of U 238 = %e g/atom",Mapprox);
+printf("\n The precise mass on an atom of U 238 = %e g/atom",M);
+printf("Varies by a negligible error")
+//Answers may vary due to round off error
+
+ 
+ 
diff --git a/3535/CH1/EX1.4/Ex1_4.sce b/3535/CH1/EX1.4/Ex1_4.sce
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+//Chapter 1, Example 1.4, Page 23
+clc
+clear
+//Density of Hydrogen atom in water
+p = 1 // density of water in g cm^-3
+Na = 6.022*10^23 // molucules/mol
+A = 18 // atomic weight of water in g/mol
+N = (p*Na)/A
+NH = 2*N
+printf("The density of water = %e molecules/cm3",N);
+printf("\n The density of hydrogen atoms = %e atoms/cm3",NH);
+//Answers may vary due to round off error