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Chem Quiz Chapter 3

WHAT IS MATTER? anything that has mass or takes up space
ORGANIZATION OF MATTER mixtures and pure substances
ORGANIZATION OF MIXTURES heterogeneous and homogeneous mixtures
ORGANIZATION OF SUBSTANCES elements and compounds
WHAT IS THE DIFFERENCE BETWEEN A GAS AND A VAPOR? Gases are gases at room temp. Vapor is a solid or liquid at room temp.
WHAT ARE PHYSICAL PROPERTIES? properties that can be measured or observed without creating a new substance
WHAT ARE INTENSIVE AND EXTENSIVE PROPERTIES? -intensive: independent to amount of substance (density, spices) -extensive: dependent to amount of substance (mass, volume)
WHAT ARE CHEMICAL PROPERTIES? characteristics that can be measured or observed only by trying to create a new substance
WHAT IS A PHYSICAL CHANGE? -a change that affects one or more of the physical properties -can alter substance without changing its properties -includes a phase change (boiling, condensing, melting, freezing, ripping)
WHAT IS A CHEMICAL CHANGE? -new substances are formed with new properties -atoms in molecules are rearranged -old bonds break, new bonds form (burning, decomp, rusting, exploding, oxidizing)
WHAT IS THE LAW OF CONSERVATION OF MASS? in any reaction, mass is neither created nor destroyed (mass of reactants = mass of products)
LIST INDICATORS OF A CHEMICAL CHANGE. -color change -production of bubbles -change in temperature -formation of a solid (mixing 2 liquids) -production of light, sound, or smell
WHAT IS A MIXTURE? -physical blend of two or more things -can be separated physically -each substance retains individual properties
WHAT ARE SOME WAYS TO SEPARATE MIXTURES? -physical sort -distillation -filtration -crystallization -sublimation -chromatography
WHAT ARE PURE SUBSTANCES? -substances that have a definite composition and are uniform -pure and homogeneous
WHAT IS AN ELEMENT? -simplest substances which retain -building blocks to other compounds -metals, non-metals, carbon, sulfur, etc.
WHAT IS A COMPOUND? -a combination of two or more elements -can only be separated chemically -properties are different than that of compound elements
HETEROGENEOUS MIXTURE: -a mixture without uniform composition -individual substances are distinct -don't blend entirely -soup; concrete
HOMOGENEOUS MIXTURE: -mixture that has uniform composition -all substances mix so that no substances are distinct -called a solution -tap water; air
Created by: mma129