HELP A student reads the length of an object from a ruler as 7.2 cm, and his teacher says that he is missing an estimated place value, and should have a measurement like "7.20 cm".

What is the length (in cm) of the smallest increment on this ruler? Meaning "what is the distance between the tick marks".

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.