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34 Cards in this Set
- Front
- Back
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Matter |
Matter is anything that has mass and takes up space. |
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chemistry |
Chemistry is thestudy of the properties of matter and how matter changes.
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Substance |
a substance is a single kind of matterthat is pure, meaning it always has a specific makeup—or composition—anda specific set of properties.
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physical property |
physical property is acharacteristic of a pure substance that can be observed withoutchanging it into another substance.
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chemical property |
chemical property is acharacteristic of a pure substance that describes its ability tochange into different substances.
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element |
An element is a puresubstance that cannotbe brokendown into any other sub-stances by chemical physical means.
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atom |
An atom is the basic particlefrom which all elements are made.
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chemical bond |
When atoms combine,they form a chemical bond, which is a force of attractionbetween two atoms.
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molecule |
In many cases, atoms combine to formlarger particles called molecules(MAHL uh kyoolz)—groups oftwo or more atoms held together by chemical bonds.
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compound |
A compound is apure substance made of two or more elements chemically combinedin a set ratio.
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chemical formula |
A compound may be represented by achemical formula, which shows the elements in the compoundand the ratio of atoms. For example, part of the gas youexhale is carbon dioxide.
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mixture |
A mixture is made of two or more substances—elements, compounds, or both—that are together in the sameplace but are not chemically combined.
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heterogeneous mixture |
In a heterogeneous mixture (het ur uh JEEnee us), you can see the different parts.
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homogeneous mixture
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The substances in ahomogeneous mixture (hoh moh JEE nee us),are so evenly mixed that you can’t see the differentparts.
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solution
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Asolution is an example of a homogeneous mixture.A solution does not have to be a liquid, however.
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Physical change |
A physical change is anychange that alters the form or appearance of matter but doesnot make any substance in the matter into a different substance. |
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Chemical change |
A change in matter thatproduces one or more new substances is a chemical change,or a chemical reaction.
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Law of conversation of mass |
The factthat matter is not created or destroyed in any chemical or physicalchange is called the law of conservation of mass.
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Energy |
Energy is theability to do work or cause change.
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Tempature |
Temperature is a measure of the averageenergy of random motion of particles of matter.
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Thermal energy |
Thermal energy is the total energy of all of the particles inan object.
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Endothermic change
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The meltingof ice is an endothermic change, a change in which energy istaken in. |
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Exothermic change
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An exothermic change releases energy.
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Kinetic energy
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Kinetic Energy is the energy of matter in motion |
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Potential energy
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Potential Energy is the energy an object has because of its position |
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Chemical energy |
The internal energy stored in the chemicalbonds between atoms is a form of potential energy that issometimes called chemical energy. |
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Electromagnetic energy |
Visible light is one example ofelectromagnetic energy, a form of energy that travels throughspace as waves. |
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Electrical energy |
Electrical energy is the energy of electricallycharged particles moving from oneplace to another. |
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Electrode |
In electrolysis, two metal stripscalled electrodes are placed in a solution,but the electrodes do not touch. |
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Weight
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Your weight is a measure of the force of gravity onyou.
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Mass
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The mass of an object is the measurement of the amount ofmatter in the object.
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International System of Units
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s To measure the properties of matter, scientistsuse a system called the International System of Units.
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Volume
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The amount of space thatmatter occupies is called its volume.
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Density
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Density relates themass of a material in a given volume.
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