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6th grade-ch. 9

Chapter 9 Study Guide--mass, matter, atoms, and elements

Matter Any solid, liquid, or gas that takes up space and as mass
Mass Amount of matter in an object. More mass = heavier
Volume Amount of space taken up by an object
Density Amount of matter in a given amount of space. Less density = will float
Density formula Density = mass/volume
Physical Properties Properties that can be observed without changing the identity of the substance, describe physical characteristics
Chemical Properties Properties that describe how a substance reacts with another substance, describe chemical characteristics
Chemical Change Ex: toast burning or baking a cake
Physical Change Ex: boiling water or melting butter
Properties of Metals Conduct heat and electricity, shiny when polished, bend rather than break
Acid Ex: tastes sour and is corrosive
Compound Two or more elements that chemically bond to create a new substance
Exothermic Reaction that releases heat. (Feels warm to the touch.)
Endothermic Reaction that takes in heat. (Feels warm to the touch.)
Proton Positive particle found in the nucleus
Neutron No charge particle found in the nucleus
Electron A negative particle found outside the nucleus
Atom The smallest unit of matter
Atomic Number The number of protons in the nucleus of an atom, this determines the element.
Element A substance that cannot be broken down into anything simpler, is made of atoms.
Periodic Table The table that contains an arrangement of all known elements.
Metal An element that conducts heat and electricity, and is shiny and bendable.
Nonmetal An element that does not conducts heat or electricity, and is not shiny and bendable
Metalloid An element that could have properties of both metals and nonmetals.
Created by: edavidshofer