Write the chemical formula of the ionic compound that is formed with Na+ combines with S2-

2Na+Cl2→2NaCl

Sodium and chlorine atoms come together to form sodium chloride (NaCl). NaCl is an ionic compound because of the strong electrostatic forces of attraction between positively charged Na metal cations and negatively charged Cl non-metal anions.

(ii) C+2S→CS2

Carbon disulfide (CS2) is made by the reaction of carbon and sulphur. Since electronegativity of C and S is almost same so it is a covalent compound.

(iii) S+O2→SO2

Sulphur reacts with oxygen to give sulphur dioxide (SO2). Sulfur dioxide bond is of covalent bonding since sulphur and oxygen are both non-metals.

(iv) Ca+H2→CaH2

Calcium hydride (CaH2) is an ionic compound that is formed when calcium metal reacts with hydrogen gas.

Compounds are formed by the combination of cation and anion.

On combining all the possible positive ions with negative ions, we get

CuCl  

2

​  

,CuSO  

4

​  

,NaCl,Na  

2

​  

SO  

4

​  

,FeCl  

3

​  

,Fe  

2

​  

(SO  

4  

)  

3

Explanation:

ur ans

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.