I am grouping calcium chloride, citric acid , potassium iodide , sodium chloride ,and sucrose according to their properties.
I put sucrose and citric acid in one group and potassium iodide , sodium chloride, and calcium chloride in another group.
Is that correct?
It could be correct. It all depends upon which properties you are using to group.
I am using the melting points according to which melted first, second,and those that didn't melt within 2 minutes ; solubility in water; solubility in ethanol;and solution conductivity.
To determine if you have grouped the substances correctly, we need to understand their properties.
Sucrose and citric acid belong to the same group because they are both molecular compounds. Sucrose is commonly known as table sugar and is a white, crystalline substance. Citric acid is a weak acid found in citrus fruits and is also a white, crystalline powder. Both substances have similar properties, such as being soluble in water and having a sweet taste.
Potassium iodide, sodium chloride, and calcium chloride belong to another group because they are all ionic compounds. Potassium iodide is a white crystalline solid, sodium chloride is table salt and also a white crystalline solid, and calcium chloride is a white powder or granules. These substances have different properties compared to molecular compounds. They are usually highly soluble in water and have ionic bonding characteristics.
Based on these properties, it seems you have grouped the substances correctly. Sucrose and citric acid have similar properties as molecular compounds, while potassium iodide, sodium chloride, and calcium chloride share characteristics as ionic compounds.