Chapter 1 Lesson 1-4 Word Scramble

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Question	Answer
Matter	Anything that has mass and takes up space.
Chemistry	The study of the properties of matter and how matter changes.
Substance	A single kind of matter that is pure and has a specific set of properties.
Physical property	A characteristic of a pure substance that can be observed without changing it into another substance.
Chemical property	A characteristic of a substance that describes its ability to change into different substances.
Element	A substance that cannot be broken down into any other substances by chemical or physical means.
Atom	The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.
Chemical bond	The force of attraction that holds two atoms together.
Molecule	A neutral group of two or more atoms held together by covalent bonds.
Compound	A substance made of two or more elements chemically combined in a specific ratio, or proportion.
Chemical formula	Symbols that show the elements in a compound and the ratio of atoms.
Mixture	Two or more substances that are together in the same place but their atoms are not chemically bonded.
Weight	A measure of the force of gravity acting on an object.
Mass	The amount of matter in an object.
International System of Units	A system of measurement based on multiples of ten and on established measures of mass, length, and time.
Volume	The amount of space that matter occupies.
Density	The ratio of mass of a substance to its volume (mass divides by volume).
Physical change	A change that alters the form or appearance of a material but does not make the material into another substance.
Chemical change	A change in which one or more substances combine or break apart to form new substances.
Law of conservation of mass	The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
Temperature	How hot or cold something is; a measure of the average energy of motion of the particles of a substance.
Thermal energy	The total energy of the motion of all the particles of an object.
Endothermic change	A change in which energy is absorbed.
Exothermic change	A change in which energy is released.
Chemical energy	A form of energy that is stored in chemical bonds between atoms.

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