Science Vocabulary

Science VocabularyWeek 2MeterMetric unit of length

LiterMetric unit of volume

GramMetric unit of mass

VolumeThe amount of space an object occupies

MassAmount of matter in an objectHypothesisReasonable guess that can be tested and is based on what is known and what is observed.Scientific TheoryA possible explanation for repeatedly observed patterns in nature supported by observations and results from many investigations.VariableAny factor that can affect the results of an experimentIndependent variableIn an experiment, the variable that is manipulated or controlled by the experimenter.Dependent VariableIn an experiment, the variable that responds to changes in the independent variable; the variable being measured.Science Vocabulary Week 31) matterAnything that has mass and takes up space.2) Law of conservation of matterStates that matter is not created or destroyed but only changes its form3) densityPhysical property of matter that can be found by dividing the matters mass by its volume4) Chemical propertyCharacteristic of something that permits its change to something new5) Physical propertyAny characteristic of matter such as color, shape, and taste that can be detected by the senses without changing the identity of the matter6) gasMatter that does not have a definite shape or volume; has particles that move at high speeds in all directions7) solidA substance with a definite shape and volume8) liquidA substance that has a definite volume but no definite shape9) Chemical changeAny change of a material into a new material with different properties10) Physical changeAny change in the size, shape, form, or state of matter in which the matters identity remains the sameScience VocabularyWeek 41) PrecisionA description of how close measurements are to each other2) AccuracyCompares a measurement to the true value3) MeniscusThe curve seen at the top of a liquid in response to its container4) Observationan act or instance of noticing or perceiving; regarding attentively or watching; the habit of observing or noticing.

5) MassMeasure of the amount of matter making up an object6) WeightA measure of the pull of gravity on the mass of an object7) DensityPhysical property that compares the mass of a substance per unit volume8) BalanceTool used for measuring mass9) VolumeThe amount of space matter occupies10) Graduated CylinderTool used to measure volumeScience VocabularyWeek 51) atomThe basic building block of all matter that is the smallest unit of an element that still has the chemical properties of that element.2) moleculeSmallest unit of a compound; formed when atoms join3) States of matterAlso called phases of matter; solid, liquid, gas, and plasma4) SolidHave a fixed shape and a fixed volume.

5) LiquidHave no fixed shape, they take the shape of their container, but they do have a fixed volume.

6) GasNo fixed shape or volume, gases take the shape of their container and completely fill it.

7) Physical propertiesA characteristic of a substance that can be observed directly or measured with a tool without changing the composition of the substance. Examples include: volume, mass, weight, density, texture, and color8) Physical changeAny change in a substance in which the composition of the substance does not change. Examples include: stretching a rubber band, smashing a pumpkin, melting ice, and slicing a carrot.9) Pure substancea kind of matter that cannot be separated into other kinds of matter by any physical or chemical process10) CompoundA pure substance composed of more than one type of element chemically combined in a fixed proportionWeek 6 VocabularyYeah!1) Uniformwithout variations in detail; constant; unvarying; undeviating

2) reactivitythe ability of an atom, molecule, or compound to undergo a chemical reaction with another atom, molecule, or compound. 3) combustibilitycapable of catching fire and burning; flammable4) viscositythe property of a fluid that resists the force tending to cause the fluid to flow.

5) pHthe symbol used to express how acidic or basic a solution is on a scale of 0 to 14, where less than 7 represents acidic, 7 neutral, and more than 7 basic. 6) precipitateto separate a substance in solid form from a solution 7) solutiona homogeneous, molecular mixture of two or more substances.

8) Phase changeThe relationship between temperatures and changes of state9) heatThe transfer of thermal energy between two objects at different temperatures.10) temperatureMeasure of the average kinetic energy of the particles in a sample of matter.VocabularyWeek 71) misciblecapable of being mixed2) immisciblenot miscible; incapable of being mixed3) condensationThe process by which a gas changes to a liquid4) vaporizationThe process by which a liquid changes into a gas5) Melting pointThe temperature at which a solid changes into a liquid; is the same temperature as freezing point6) Freezing pointThe temperature at which a liquid turns into a solid; that same temperature as melting point7) sublimationA phase change from solid directly to gas or from gas directly to a solid, without ever turning into a liquid8) Boiling pointThe temperature at which a liquid changes to a gas9) Convection currentMovement of a gas, liquid, or plastic solid caused by variations in density that result from uneven heating of matter10) evaporateTo change from a liquid to a gas at or below the boiling pointVocabularyWeek 81) electronSubatomic particle that carries a negative charge

2) Electron cloudArea of space around the nucleus of an atom where electrons are found

3) atomThe smallest part of an element that keeps all the properties of that element4) Energy levelThe different areas for an electron in an atom

5) Chemical bondThe force that holds two atoms together6) protonsSubatomic particles found in the nucleus of an atom that have a positive charge7) neutronsSubatomic particles found in the nucleus of an atom that have no charge8) ionAn atom that is no longer neutral because it has gained or lost an electron9) moleculeThe neutral particle formed when atoms share electrons10) compoundA pure substance containing two or more elements that are chemically bondedVocabularyWeek 91) elementNatural or synthetic material that cannot be broken down into simpler materials by ordinary means; has unique properties and is generally classified as metal, metalloid, or nonmetal.2) Valance electronsElectrons located in the outermost energy level of an atom3) Atomic numberThe number of protons in the nucleus of an atom 4) Atomic massAlso known as atomic weight; the average mass of an atom of an element5) Periodic table of elementsA chart that organizes information about all of the known elements according to their properties6) Valance numberthe number of electrons needed to fill the outermost shell of an atom7) Subatomic particlea particle smaller than an atom8) DemocritusA Greek philosopher who proposed the idea of an atom; a particle so small that it could not be divided9) John DaltonA British chemist and school teacher; showed through experimentation and observation in the 1700s that All substances are made of atoms.Atoms of the same element are exactly alike and atoms of different elements are differentAtoms join with other atoms to make new substance.10) J. J. ThomsonBritish scientist; in 1897 discovered that there are small particles inside the atom.