Science Study Guide 2022 End of Semester Vocab

Definition of Atom

• A measure of the amount of space an object takes up

• The smallest unit of an element that has the chemical identity of that element

• Two or more atoms held together by chemical bonds

• The measure of the amount of matter in an object

Definition of Molecule

• A substance that cannot be separated or broken down into simpler substances by chemical means

• Matter cannot be created or destroyed in ordinary chemical or physical changes

• The smallest unit of an element that has the chemical identity of that element

• Two or more atoms held together by chemical bonds

Definition of Compound

• A pure substance made up of 2 or more different types of atoms joined by chemical bonds

• A substance that cannot be separated or broken down into simpler substances by chemical means

• A chemical property that can only be observed by trying to change the identity of a substance in a chemical reaction

• Uses chemical formulas to model what happens in a chemical reaction

Definition of Element

• Matter cannot be created or destroyed in ordinary chemical or physical changes

• The substance or substances that form in a chemical reaction

• A substance that cannot be separated or broken down into simpler substances by chemical means

• A pure substance made up of 2 or more different types of atoms joined by chemical bonds

Definition of Pure Substance

• A substance that cannot be separated or broken down into simpler substances by chemical means

• A measure of the amount of space an object takes up.

• A measure of the amount of matter in an object

• A material that cannot be physically separated into its parts

Definition of Physical Property

• A property that can only be observed by trying to change the identity of a substance in a chemical reaction

• Matter cannot be created or destroyed in ordinary chemical or physical changes

• The process in which the building blocks of matter-atoms-are rearranged to produce different substances

• A combination of chemical symbols and number that represent a single unit of a substance

Definition of Chemical property

• A property that can only be observed by trying to change the identity of a substance in a chemical reaction

• Uses chemical formulas to model what happens in a chemical reaction

• The substance or substances that form in a chemical reaction

• Can only be observed by trying to change the identity of a substance in a chemical reaction

Definition of mass

• A measure of the amount of space an object takes up

• A material that cannot be physically separated into its parts

• A measure of the amount of matter in an object

• Matter cannot be created or destroyed in ordinary chemical or physical changes

Definition of Volume

• A measure of the amount of matter in an object

• a measure of the amount of space an object takes up, Formula for regular objects: Length times Width times Height

• A material that cannot be physically separated into its parts

• The substance or substances that form in a chemical reaction

Definition of Amorphous Structure

• A pure substance made up of 2 or more different types of atoms joined by chemical bonds

• Crystalline silicon has an ordered arrangement that makes it more efficient at converting sunlight to electrical energy, but it is also more expensive to use

• A combination of chemical symbols and number that represent a single unit of a substance

• Amorphous silicon has a less ordered, less uniform structure than crystalline silicon