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22 Cards in this Set

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What is the scientific study of the compostition, structure, and properties of matter and the changes that matter undergoes?
chemistry
What is anything that has mass and takes up space?
matter
What is a substance that cannot be seperated or broken down into simpler substances by chemical means?
element
What is the smallest unit of an element that maintains the properties of that element?
atom
What is a substance made of atoms of two or more different elements that are chemically combined?
compound
What is the smallest unit of a substance that keeps all the physical properties of that substance?
molecule
What is a combination of chemical symbols and numbers to represent a substance?
chemical formula
What is a sample of matter, either a single element or single compound, that has definite chemical and physical properties?
pure substance
What is a combination of two or more substances that are not chemically combined?
mixture
What is the temperature and pressure at which a solid becomes a liquid?
melting point
What is the temperature at which a liquid becomes a gas?
boiling point
What is the ratio of the mass of a substance to the volume of a substance?
density
What is the ability of a substance to combine chemically with another substance?
reactivity
What is the ability of a substance to react in the presence of oxygen and burn when exposed to a flame?
flammability
What is a change of matter from one form to another without a change in chemical properties?
physical change
What is a change that occurs when a substance changes compostion by forming one or more new substances?
chemical change
What are three main examples of physical properties?
boling point, melting point, and density.
What is a characteristic property?
Something that always stays the same no matter how much you have of it.
What are the two main examples of chemical properites?
reactivity and flammability
What are two examples of a physical change?
Cutting your hair and painting your nails.
What are three signs that show that a chemical change has occured?
color change, water or gas formation, and temperature change
What are two examples of a chemical change?
Getting a perm or dying your hair