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