(a) Mention the four types of information given by an equation.
(b) State the law of conservation of mass as applicable in a chemical reaction.
CBSE Class X Science SA 2 (3 Marks)
Answers
(a) The four types of information given by an equation are as follows :
(i) Physical state of reactants and products.
(ii) Conditions such as temperature, pressure and heat.
(iii) Catalyst involved.
(iv) Change in the state.(b) Total mass of the elements present in the reactants of a chemical reaction has to be equal to the total mass of elements present in the products.
Answer:
chemical equation tells us the physical states of the products and reactants ( solid by s, liquid by l and gaseous by g.)
also, the arrow in between products and reactants indicate the direction of reaction.
by the word "heat" in the products sign, we come to know that equation is exothermic. by the symbol∆ above the arrow, we learn that heat is given for the chemical reaction to take place.
the + sign between the reactants and products indicate that they are combined in the reaction
the name of any catalyst is also useful in a reaction to express that it is used to speeden up the reaction
temperature if mentioned also lets us know that a chemical reaction takes place at that specific temperature
names of the reactants and products are also mentioned along with their chemical formula for identification