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Unit 3: Chemical Equations, Reactions & Stoichiometry
Is a change in which one or more substances are converted into new substances.
a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.
4 Indications of a chemical reaction
precipitate, change in color, increase or decrease in temperature, and/ or production of gas.
the elements or compounds that enter into a chemical reaction
the elements or compounds produced by a chemical reaction
a solid that forms and settles out of a liquid mixture
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
dissolved in water
a substance that initiates or accelerates a chemical reaction without itself being affected
a reaction in which two or more substances combine to form a new compound
separation of a substance into two or more substances that may differ from each other and from the original substance
A reaction in which one element or radical takes the place of another element or radical in a compound
a reaction in which a gas, a solid precipitate, or a molecular compound forms from the apparent exchange of atoms or ions between two compounds
a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light
Activity series of metals
lists metals in order of decreasing reactivity
the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)
the molecular weight of a substance expressed in grams
number of representative particles in a mole, 6.02 X 10^23
the mass of one mole of a pure substance
the sum of the average atomic masses of all the atoms represented in the formula of any molecule, formula unit, or ion
the percentage by mass of each element in a compound
a chemical formula showing the ratio of elements in a compound rather than the total number of atoms
a chemical formula based on analysis and molecular weight
the relative number of moles of the substances required to produce a given amount of product in a chemical reaction
the substance that controls the quantity of product that can form in a chemical reaction
The substance that is not used up completely in a reaction
the measured amount of a product obtained from a reaction
the maximum amount of product that can be produced from a given amount of reactant
The ratio of the actual yield to the theoretical yield, multiplied by 100
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