a. Chemical reactions: These are processes that lead to the transformation of one set of chemical substances to another. They are characterized by the breaking of bonds in reactants and the formation of new bonds in products.

b. Law of conservation of mass: This law states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time. In other words, the quantity of mass is conserved over time.

c. Reactants: These are substances that exist before a chemical reaction starts, located on the left-hand side of the chemical equation.

d. Products: These are substances that are formed after the chemical reaction, located on the right-hand side of the chemical equation.

e. Thermal decomposition: This is a chemical reaction where a substance breaks down into two or more simpler substances when heated.

f. Coefficients: In a chemical equation, these are the numbers placed before the reactants and products. They indicate the number of moles of each substance involved in the reaction.

g. Subscripts: These are numbers written at the lower right after the symbol of an element in a chemical formula. They indicate the number of atoms of the element in the compound.

h. First Law of Thermodynamics: This law states that energy can neither be created nor destroyed, only transferred or changed from one form to another.

i. Heat: This is a form of energy transfer among particles in a substance, or between different substances, by means of kinetic energy of those particles.

j. Specific Heat: This is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

k. Heat of Fusion: This is the amount of energy required to change a substance from the solid phase to the liquid phase at its melting point.

l. Heat of Vaporization: This is the amount of energy required to change a substance from the liquid phase to the gas phase at its boiling point.

Question

a. Chemical reactions: These are processes that lead to the transformation of one set of chemical substances to another. They are characterized by the breaking of bonds in reactants and the formation of new bonds in products.

b. Law of conservation of mass: This law states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time. In other words, the quantity of mass is conserved over time.

c. Reactants: These are substances that exist before a chemical reaction starts, located on the left-hand side of the chemical equation.

d. Products: These are substances that are formed after the chemical reaction, located on the right-hand side of the chemical equation.

e. Thermal decomposition: This is a chemical reaction where a substance breaks down into two or more simpler substances when heated.

f. Coefficients: In a chemical equation, these are the numbers placed before the reactants and products. They indicate the number of moles of each substance involved in the reaction.

g. Subscripts: These are numbers written at the lower right after the symbol of an element in a chemical formula. They indicate the number of atoms of the element in the compound.

h. First Law of Thermodynamics: This law states that energy can neither be created nor destroyed, only transferred or changed from one form to another.

i. Heat: This is a form of energy transfer among particles in a substance, or between different substances, by means of kinetic energy of those particles.

j. Specific Heat: This is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

k. Heat of Fusion: This is the amount of energy required to change a substance from the solid phase to the liquid phase at its melting point.

l. Heat of Vaporization: This is the amount of energy required to change a substance from the liquid phase to the gas phase at its boiling point.

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