physical & chemical changes

47 terms by angelmouzon

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physical properties

properties that can be observed or measeured with out changing the matter into a new substance

4 physical properties

boiling point, melting point, density and color

melting point

temperature at which a solid can turn into a liquid

melting point temperature

0 degrees C, 32 degrees F

boiling point temperature

100 degrees C, 212 degrees F

melting point

the temperature at which a solid begins to melt

examples of physical properties

melting point, boiling point, density, color

examples of chemical properties

ability to burn, ability to rust, ability to tarnish

ability to burn

substance reacting quickly with oxygen to produce heat and light; burning

ability to rust

substance reacting slowly with oxygen to produce a red-orange color on a metal

ability to tarnish

substance slowly reacting with the air to produce a green-greyish color on a metal, usually silver and cooper; statue of liberty

evidences of a physical change

change in state of matter, change in size, shape, color, texture, volume, mass

evidences of a chemical change

production of gas, color change, temperature change, odor production, precipitae formation

precipitate

another word meaning solid

examples of a chemica change

burning wood, burning a candle, metal rusting, tea kettle turning green.

chemical change

change that occurs when a new substance has formed; burning paper

physical change

change that occurs when matter changes physically only (how it looks)

sublimation

when a substance changes directly from a solid to a gas; dry ice, solid air freshners

examples of physical changes

tearing paper, melting ice cream, painting a picture, crushing a desk

atom

smallest particle of an element that still has the properties of that element; has mass amd takes up space

matter

anything that has mas and takes up space

density

physical property that describes the relationship between amss and volume

mass

how much matter is in an object; measured with a triple beam balance; unit is grams

volume

how much space matter occupies; measured with a graduated cylinder; uints are mL or cubic cm

element

pure substances that cannot be changed into simpler substances

element

composed of one kind of atom

compound

pure substance, chemically combined, that is composed of two or more elements

compound

also called a molecule

mixture

composed of two or more different substances that retain or keep their individual properties

mixture

can be seperated by physical means

seperation by physical means

filtration, evaporation, sifting

2 types of mixtures

heterogeneous & homogeneous

heterogeneous mixture

not uniform (evenly mixed) throughout; substances are visible

examples of heterogeneous mixture

pizza, trail mix, cereal, female's purse

homogeneous mixture

uniform throughout, the substances anre evenly mixed and are not visible

solution

another name for a homogeneous mixture

examples of homogeneous mixture

toothpaste, hair gel, ketchup, fog

independent variable

variable that the scienctist has control of and changes; testable variable

dependent variable

variable that changes in response to the independent variable

control variable

factor that does not recieve the IV; standard for comparison

constants

factors in the experiment that never changes

states of matter

the different phases matter goes through

melting

the process of a solid turning to a liquid

freezing

the process of a liquid turning to a solid

evaporation

the process of a liquid turning to a gas (puddles of water outside)

mathematical equation for density

D=m/v

boiling

the process of a liquid turning to a gas (water in a pot getting hot and forming bubbles on top of a stove)

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