Science Assessment

RG085003

During the reaction between potassium iodide and lead nitrate, energy is required to break the bonds of the reactant molecules, and energy is released when the bonds of the product molecules are formed.

RG034004

Energy is always required to separate atoms of reactant molecules.

RG036003

The amount of chemical energy depends on the types and number of atoms inside the battery and how they are arranged in molecules.

RG035003

The amount of energy required to separate atoms of the reactants in a glow stick is less than the amount of energy released when the atoms connect to form the product.

RG071003

During photosynthesis, energy is required to separate atoms of the reactants. This amount of energy is greater than the amount of energy released when atoms connect to form the products.

RG085004

During the reaction between KI and Pb(NO3)2, energy is required to break the bonds of the reactant molecules, and energy is released when the bonds of the product molecules are formed.

RG212001

If the chemical energy of the products of a chemical reaction is greater than the chemcial energy of the reactants, energy was taken in from the surroundings because the amount of energy required to break bonds of the reactant molecules is greater than the amount of energy released when bonds of the product molecules are formed.

RG213001

If the chemical energy of the products of a chemical reaction is less than the chemcial energy of the reactants, energy was released to the surroundings because the amount of energy required to break bonds of the reactant molecules is less than the amount of energy released when bonds of the product molecules are formed.