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Science Terms

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Science Terms TAKS Objective 4 Forms of water such as rain, snow, sleet, or hail that fall from clouds and reach the earth s surface def: Precipitation The process ... – PowerPoint PPT presentation

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Title: Science Terms


1
Science Terms
  • TAKS Objective 4

2
def Compound
  • Composed of atoms of different substances that
    are chemically combined

3
def Element
  • A substance that can not be broken down into
    simpler substances

4
def Mixture
  • Combination of substances that do not combine
    chemically but do retain their individual
    properties

5
def Physical properties
  • Characteristic of a material that can be observed
    without changing the identity of the material

6
def Buoyancy
  • Ability of a fluid to exert and upward force on
    an object immersed in the fluid

7
def Density
  • A ratio that compares the mass of an object to
    its volume

8
def Viscosity
  • A measure of the resistance of a liquid to flow.

9
def Law of conservation of mass
  • State that mass is neither created nor destroyed

10
def Balanced chemical equation
  • Reaction in which the number of atoms of each
    kind of element is equal of both sides

11
def Physical change
  • Alters the properties of a substance, but not its
    chemical composition

12
def Rock cycle
  • Continuous dynamic set of processes by which
    rocks are changed into other types of rock

13
def Igneous rock
  • Rock formed from magma hardening (physical
    change)

14
def Sedimentary rock
  • Rock formed from rock fragments being compacted
    (physical change)

15
def Metamorphic rock
  • Rock formed when heat and pressure are applied to
    other rocks, these new rocks have new chemical
    composition (chemical change)

16
def State of matter
  • Physical forms in which all matter naturally
    exists

17
def Chemical change
  • Process involving one or more substances changing
    into new substances

18
def Digestion
  • The process of making food absorbable by breaking
    it down into simpler chemical compounds

19
def Periodic group
  • A column of elements on the periodic table, these
    elements will have similar properties

20
def Alkali metals
  • Elements in group 1A, very reactive, contain one
    valence electron

21
def Noble Gases
  • Elements in group 8A, are not reactive, contain 8
    valence electrons

22
def Halogens
  • Elements in group 7A, very reactive, contain 7
    valence electrons

23
def Oxidation
  • The loss of electrons from the atoms of a
    substance

24
def Rusting
  • The oxidation of iron

25
def Solubility
  • The maximum amount of solute that will dissolve
    in a given amount of solvent at a specific
    temperature and pressure

26
def Solute
  • The substance that dissolves

27
def Solution
  • Uniform mixture that may contain solids, liquids,
    or gases

28
def Solvent
  • The dissolving medium

29
def Universal solvent
  • Water- due to its polarity and ability to
    dissolve many different solutes

30
def Polar
  • Description of covalent solid in which electrons
    are shared unequally given the molecule charged
    parts

31
def Acid
  • A substance that tastes sour, reacts with metals
    and turns blue litmus paper red

32
def Base
  • A substance that tastes bitter, feels slippery,
    and turns red litmus paper blue

33
def Condensation
  • The process by which gas such as water vapor
    changes to liquid such as water- how clouds are
    formed

34
def Precipitation
  • Forms of water such as rain, snow, sleet, or hail
    that fall from clouds and reach the earths
    surface

35
def Evaporation
  • The process by which molecules at the surface of
    a liquid absorb enough energy to change to the
    gaseous state, such as water vapor
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