A compound is decomposed by an electric current.
One breaks down into at least two products.
A compound burns in the presence of oxygen.
A new, more complex compound is formed.
Energy is always created in the form of heat.
Energy is transferred from the surroundings to the reactants.
Energy is transferred from the reactants to the surroundings.
Energy is used to force electrons to move to higher energy levels.
A chemical change is taking place.
A physical change has just occurred.
Organic chemicals are present.
Oxygen is present.
Water and carbon dioxide
Hydrogen and oxygen ions
Hydrogen gas and oxygen gas
Oxygen and methane
Smaller surface area
Presence of a catalyst
Atoms are destroyed.
Atoms are created.
Atoms are heated and cooled.
Atoms are rearranged.
Atomic mass of the reactants.
Proportional masses of the reactants.
Molar mass of the reactants.
Total mass of the reactants.
Copper (II) chloride.
The surroundings to the reactants.
One reactant to another.
The container to the chemicals.
The reactants to the surroundings