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Science > Chenistry science Vocab (Unit 1) > Flashcards

Chenistry science Vocab (Unit 1) Flashcards

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1
Q

Properties

A

charactersistic that describes a particular substance.

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2
Q

Freezing

A

change of state from liquid to solid

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3
Q

Ductility

A

solid that can be stretched into a long wire.

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4
Q

Element

A

Pure substance that cannot be broken
down into other substances; substance made up of
only one type of atom

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5
Q

Suspension

A

Cloudy mixture in which tiny particles of one substance are held within another, and the particles can be separated out.

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6
Q

Atomic mass

A

Mass of one atom of one element calculated from the total number of protons, neutrons, and electrons of that atom.

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7
Q

Non-Metals

A

Dull, brittle element that does not
conduct electricity

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8
Q

Chemical formula

A

Combination of symbols that
represent a compound; the formula identifies the
elements in the compound and the amount of each element. Example H2o

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9
Q

Chemical reaction

A

a reaction that takes place when
two or more substances react to form new substances example wood burning.

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10
Q

Conservation of mass

A

principle that matter is not
created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants

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11
Q

WHMIS

A

Workplace Hazardous Materials
Information System; a system of easy-to-see warning symbols on hazardous materials

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12
Q

Sublimation

A

Change of state from solid to gas or gas to solid.

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13
Q

Conductivity

A

Ability of a substance to conduct electricity or heat

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14
Q

Compound

A

Chemical combination of two or more elements in a specific ratio

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15
Q

Colloid

A

cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance.

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16
Q

Period

A

Horizontal row in periodic table. Think of a sentence.

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17
Q

Metalloids

A

Element that has both metallic and non metallic properties.

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18
Q

Ionic compound

A

Pure substance formed when at
least one metal and one non-metal combine

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19
Q

Exothermic reaction

A

Chemical that releases energy

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20
Q

Closed system

A

An experiment where matter is not allowed in or out of the system.

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21
Q

States of matter

A

The states matter can take.
Ex Solid, Liquid

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22
Q

Deposition

A

Change of state from gas to solid.

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23
Q

Solubility

A

Degree to where a substance dissolves in solvent to make a solution.

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24
Q

Mixture

A

Combination of pure substances.

25
Q

Protons

A

Positively charged atom in the nucleus of an atom.

26
Q

Group

A

Vertical row on periodic table.

27
Q

Alkali Metals

A

Group 1 elements in the periodic table ( not including hydrogen) They’re the most reactive metals.

28
Q

Ions

A

Atom that has become electrically charged because of lost or increase in electron.

29
Q

Endothermic reaction

A

Chemical reaction that absorbs energy.

30
Q

Open system

A

Where matter can enter and escape.

31
Q

Melting

A

The change if state from solid to liquid

32
Q

Physical properties

A

Property that describes physical appearance and composition of a substance.

33
Q

Chemical property

A

Description of how a substance
interacts with other substances.

34
Q

Mechanical mixture

A

Mixture where components can be extracted once mixed. Reaction is reversible. Components are visible.

35
Q

Electrons

A

Negatively charged particle the orbits the nucleus of an atom.

36
Q

Atomic number

A

Number of protons in the nucleus of one atom of an element.

37
Q

Alkali Earth Metals

A

Group 2 In periodic table. Reactivity is not as strong as the Alkali metals.

38
Q

Polyatomic ions

A

Group of atoms acting as one.

39
Q

Combustion

A

Chemical reaction that occurs when oxygen reacts with a substance to form a new
substance and give off energy

40
Q

Catalyst

A

Substance that helps a chemical reaction to proceed more quickly

41
Q

Evaporation

A

Change of state from liquid to gas.

42
Q

physical change

A

A change that is physical ex ripping a paper

43
Q

Chemical change

A

A change where the compositions of the substance are changed. ex burning something

44
Q

Solution

A

homogeneous mixture; mixture of two or-more pure substances that looks like one substance

45
Q

Neutrons

A

Neutral particle in the nucleus of an atom

46
Q

Mass number

A

The sum of the number of protons and neutrons in an atom

47
Q

Halogens

A

Group 17 on the periodic table. Most reactive non metals.

48
Q

Molecule

A

Group of atoms joined by covalent bonds. (A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.)

49
Q

Corrosion

A

Slow chemical change that occurs when oxygen in the air reacts with a metal. ex rust

50
Q

Enzyme

A

Catalyst involved in chemical reactions in living things

51
Q

Condensation

A

Change of state from gas to liquid.

52
Q

Malleability

A

Description of a substance that can be pounded or rolled into sheets.

53
Q

Pure substance

A

Substance made of only one kind of matter, which has a unique set of properties

54
Q

Aqueous solution

A

Solution in which water is the solvent

55
Q

Periodic table

A

Table in which the elements are
organized by their physical and chemical properties

56
Q

Metals

A

Shiny, malleable, ductile element that conducts electricity

57
Q

Noble gases

A

Group 18. Most stable and unreactive metals.

58
Q

Molecular compounds

A

Pure substance formed when non metals combine.

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