Chenistry science Vocab (Unit 1)

Question 1

Properties

Answer 1

charactersistic that describes a particular substance.

Question 2

Freezing

Answer 2

change of state from liquid to solid

Question 3

Ductility

Answer 3

solid that can be stretched into a long wire.

Question 4

Element

Answer 4

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

Question 5

Suspension

Answer 5

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

Question 6

Atomic mass

Answer 6

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

Question 7

Non-Metals

Answer 7

Dull, brittle element that does not
conduct electricity

Question 8

Chemical formula

Answer 8

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

Question 9

Chemical reaction

Answer 9

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

Question 10

Conservation of mass

Answer 10

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

Question 11

WHMIS

Answer 11

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

Question 12

Sublimation

Answer 12

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

Question 13

Conductivity

Answer 13

Ability of a substance to conduct electricity or heat

Question 14

Compound

Answer 14

Chemical combination of two or more elements in a specific ratio

Question 15

Colloid

Answer 15

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

Question 16

Period

Answer 16

Horizontal row in periodic table. Think of a sentence.

Question 17

Metalloids

Answer 17

Element that has both metallic and non metallic properties.

Question 18

Ionic compound

Answer 18

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

Question 19

Exothermic reaction

Answer 19

Chemical that releases energy

Question 20

Closed system

Answer 20

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

Question 21

States of matter

Answer 21

The states matter can take.
Ex Solid, Liquid

Question 22

Deposition

Answer 22

Change of state from gas to solid.

Question 23

Solubility

Answer 23

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

Question 24

Mixture

Answer 24

Combination of pure substances.

Question 25

Protons

Answer 25

Positively charged atom in the nucleus of an atom.

Question 26

Group

Answer 26

Vertical row on periodic table.

Question 27

Alkali Metals

Answer 27

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

Question 28

Ions

Answer 28

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

Question 29

Endothermic reaction

Answer 29

Chemical reaction that absorbs energy.

Question 30

Open system

Answer 30

Where matter can enter and escape.

Question 31

Melting

Answer 31

The change if state from solid to liquid

Question 32

Physical properties

Answer 32

Property that describes physical appearance and composition of a substance.

Question 33

Chemical property

Answer 33

Description of how a substance interacts with other substances.

Question 34

Mechanical mixture

Answer 34

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

Question 35

Electrons

Answer 35

Negatively charged particle the orbits the nucleus of an atom.

Question 36

Atomic number

Answer 36

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

Question 37

Alkali Earth Metals

Answer 37

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

Question 38

Polyatomic ions

Answer 38

Group of atoms acting as one.

Question 39

Combustion

Answer 39

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

Question 40

Catalyst

Answer 40

Substance that helps a chemical reaction to proceed more quickly

Question 41

Evaporation

Answer 41

Change of state from liquid to gas.

Question 42

physical change

Answer 42

A change that is physical ex ripping a paper

Question 43

Chemical change

Answer 43

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

Question 44

Solution

Answer 44

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

Question 45

Neutrons

Answer 45

Neutral particle in the nucleus of an atom

Question 46

Mass number

Answer 46

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

Question 47

Halogens

Answer 47

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

Question 48

Molecule

Answer 48

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.)

Question 49

Corrosion

Answer 49

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

Question 50

Enzyme

Answer 50

Catalyst involved in chemical reactions in living things

Question 51

Condensation

Answer 51

Change of state from gas to liquid.

Question 52

Malleability

Answer 52

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

Question 53

Pure substance

Answer 53

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

Question 54

Aqueous solution

Answer 54

Solution in which water is the solvent

Question 55

Periodic table

Answer 55

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

Question 56

Metals

Answer 56

Shiny, malleable, ductile element that conducts electricity

Question 57

Noble gases

Answer 57

Group 18. Most stable and unreactive metals.

Question 58

Molecular compounds

Answer 58

Pure substance formed when non metals combine.