Question

Question 5 Give the names of the elements present in the following compounds: (a) Quick lime (b) Hydrogen bromide (c) Baking powder (d) Potassium sulphate

Class 9 - Science - Atoms and Molecules Page 44

Answer 1

(a) Quicklime is calcium oxide Cao.  The elements in it are Calcium (Ca) and oxygen (O)
(b) Hydrogen bromide is HBR. The elements in it are Hydrogen  (H) and bromine (Br)
(c) Baking soda is sodium hydrogencarbonate, NaHCO3. The elements present are sodium (Na), Hydrogen (H), Carbon (Ca), oxygen (O)
(d) Potassium sulphate is K2SO4. The elements present are Potassium  (K), Sulphur (S), Oxygen (O)

Answer 2

Hey there


The elements that are present in the following compounds are:


a) Quick lime that is CaO - Oxygen and Calcium.


b) Hydrogen bromide that is HBr - Bromine and Hydrogen. 


(c) Baking powder that is NaHCO3 - Carbon, Hydrogen, Oxygen and Sodium. 


(d) Potassium sulfate that is K2SO4 - Oxygen, sulfur and potassium. 



If we know the compound's chemical formula, then it's very easy to find the elements present in it!


Hope dis helps!