Unit 7 Lessons 3-4

A process that leads to the transformation of one or more substances into different substances through the breaking and forming of chemical bonds.

A principle stating that energy cannot be created or destroyed, only transformed from one form to another.

A shorthand representation of a chemical compound that shows the elements and the number of atoms of each element in the compound.

A representation of a chemical reaction using symbols and formulas to show the reactants and products involved.

The substances that undergo change during a chemical reaction, which are present before the reaction begins.

A principle that states that mass is neither created nor destroyed in a chemical reaction, so the mass of reactants equals the mass of products.

A type of chemical reaction that releases energy in the form of heat, making the surroundings warmer.

A type of chemical reaction that absorbs energy from its surroundings, often making the surroundings feel cooler.

The sum of the relative atomic masses of the isotopes of an element, weighted by their natural abundance.

An arrangement of chemical elements, organized based on their properties, and used as a reference in chemistry.

A type of element that has properties of both metals and nonmetals, often found along the staircase line on the periodic table.

A one- or two-letter abbreviation that represents a chemical element in the periodic table.

A substance that typically conducts heat and electricity and is usually malleable and ductile.

A vertical column in the periodic table that groups elements with similar properties and the same number of valence electrons.

An element that typically lacks metallic properties, often poor conductors of heat and electricity, and usually gains electrons in chemical reactions.