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test date: Nov. 21 2011

anything that has a mass and takes up space

matter

a fixed composition and distinct properties; can be a element or compound

substance

matter that has only 1 set of chemical and physical properties

pure substance

made up of 1 type of atom; a substance that cannot be decomposed into a simpler substances by any chemical or physical process

element

2 or more elements chemically bonded together; have properties that are different from the elements that make them up, can be further decomposed into simpler substances by chemical reaction

compound

a combination of 2 or more substances, each compound in the mixture retains its own set of chemical and physical properties; can be separated by physical means

mixture

indicates the same; same uniform appearance and composition throughout; cannot see different parts; a solution is a homogeneous mixture

homogeneous mixture

indicates the difference; uneven distribution of substances; a mixture that consists of physically distinct parts, each with different properties

heterogeneous

when water can be separated into hydrogen and oxygen

electrolysis

a characteristic of a substance that can be observed

property

can be observed without the identity of the substance

physical property

can be observed by changing the identity of the original substance; shows how substances can form new substances

chemical property

it is chemical reaction, identity changes

chemical change

a change in any physical property of a substance, but not in the substance itself; identity remains the same

physical change

when you use the physical properties to water to separate it from the salt

distillation process

when matter is neither created nor destroyed during the chemical change

law of conservation of mass

when the temperature increases

exothermic

when the temperature decreases

endothermic

atoms, hydrogen, carbon, oxygen, diamonds, graphite, gold, and helium

examples of elements

molecules, CO2 (carbon dioxide), H2O (water), (di-hydrogen oxide), NaCl (salt), C12H22O11 (sodium clouride), (sucrose) (sugar)

examples of compounds

copper and zinc, iron and salt

examples of mixtures

vinegar, saltwater, and bottled soft drink

examples of homogeneous

sand, granite, wood, milk, blood, and chicken noodle soup

examples of heterogeneous

color, shape, density (mass, volume), size, texture, melting point, and boiling point

examples of physical properties

flammability, reaction with oxygen, ability to rust, reaction with acid, base

examples of chemical properties

melting, boiling, breaking, malleability, and ductility

examples of physical changes

formation of gas, formation of solids or precipate, change in color, change in energy due to a change in temperature, production of odor

examples of chemical change

compound, heterogeneous mixture, and homogeneous mixture

what can you separate

chemical

what does a chemical formula and name represent

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