Chemistry

Question 1

What is the smallest unit of matter?

Answer 1

an atom

Question 2

Subatomic particle with a negative charge…

Answer 2

an electron

Question 3

What is the center of the atom that holds the protons and neutrons called?

Answer 3

the nucleus

Question 4

What is the positively charged subatomic particle called?

Answer 4

the proton

Question 5

These are the areas where electrons are located

Answer 5

the energy level or orbits

Question 6

The subatomic particle that carries no electrical charge

Answer 6

the neutron

Question 7

this number on the periodic table tells the number of protons in an atom

Answer 7

the atomic number

Question 8

the only subatomic particle that cannot be changed without changing the type of atom

Answer 8

proton

Question 9

an atom that has gained or lost neutrons

Answer 9

isotope

Question 10

this number tells how many protons and neutrons are in an atom…it is an average of all of the isotopes

Answer 10

atomic mass

Question 11

a chart showing trends in elements by placing them into groups and periods

Answer 11

the periodic table

Question 12

the name of a row on the periodic table

Answer 12

period

Question 13

on the periodic table, this tells how many electron levels an atom has

Answer 13

period

Question 14

on the periodic table, this tells how many valence electrons are in an atom

Answer 14

group

Question 15

the columns on the periodic table

Answer 15

groups

Question 16

another name for family on the periodic table

Answer 16

group

Question 17

abbreviations for elements

Answer 17

chemical symbol

Question 18

the groups of atoms on the left of the periodic table

Answer 18

metals

Question 19

these atoms lose electrons

Answer 19

metals

Question 20

elements that are hard, shiny, have high conductivity, are malleable, ductile, have high boiling and melting points

Answer 20

metals

Question 21

the only liquid metal

Answer 21

mercury

Question 22

most metals are this color

Answer 22

silver

Question 23

can be hammered into shapes and thin sheets

Answer 23

malleable

Question 24

can be pulled into wire

Answer 24

ductile

Question 25

rings like a bell when struck

Answer 25

sonorous

Question 26

the ability to transmit an electrical current

Answer 26

conductivity

Question 27

will form compounds with other atoms

Answer 27

reactivity

Question 28

will for rust or otherwise deteriorate a substance

Answer 28

corrosive

Question 29

have 1 valence electron

Answer 29

alkali metals

Question 30

group 2

Answer 30

alkaline earth metals

Question 31

metals in the middle of the periodic table to include copper, gold, silver, platinum

Answer 31

transition metals

Question 32

group of elements that are brittle, dull, nonconductive

Answer 32

nonmetals

Question 33

highly reactive group of atoms with 7 valence electrons

Answer 33

halogens

Question 34

group 18

Answer 34

noble gases

Question 35

group of elements with properties of metals and nonmetals

Answer 35

metalloids or semi-metals

Question 36

a material that conducts a current under certain conditions

Answer 36

semiconductor

Question 37

the process of a radioactive atom changing to become a stable atom

Answer 37

radioactive decay

Question 38

the spontaneous emission of radiation from the nucleus of an atom

Answer 38

radioactivity

Question 39

the amount of time that it takes for half of the radioactive particles in an atom to become stable

Answer 39

half-life

Question 40

the unstable atoms in an element during the decay process

Answer 40

parent atoms

Question 41

electrons in the outer energy level of an atom

Answer 41

valence electrons

Question 42

a chemical abbreviation using dots to represent the valence electrons of an atom

Answer 42

Lewis dot structure

Question 43

the combining of two atoms by electrostatic charges or by sharing of electrons

Answer 43

chemical bond

Question 44

a positively or negatively charged atom that has gained or lost one or more electrons

Answer 44

ion

Question 45

a compound that is formed by the gain or loss of electrons causing a charge on the atom that is attracted to an atom of the opposite charge

Answer 45

ionic compound

Question 46

the recipe for a compound showing the type and number of atoms

Answer 46

chemical formula

Question 47

a small number following a chemical symbol that tells the number of atoms

Answer 47

subscript

Question 48

compound formed by sharing electrons

Answer 48

covalent bond

Question 49

atoms joined together

Answer 49

molecule

Question 50

a covalently bonded compound that does NOT have equal sharing of electrons

Answer 50

polar bond

Question 51

a covalently bonded compound that has equal sharing of electrons

Answer 51

nonpolar bond

Question 52

anything that has mass and takes up space (volume)

Answer 52

matter

Question 53

the study of the properties of matter and how it changes

Answer 53

chemistry

Question 54

a reaction that requires heat energy to take place

Answer 54

endothermic reaction

Question 55

a reaction that gives off heat energy

Answer 55

exothermic reaction

Question 56

property that describes how atoms will join

Answer 56

chemical property

Question 57

a property that is observable with the senses

Answer 57

physical property

Question 58

the starting components of a chemical reaction

Answer 58

reactants

Question 59

the ending components of a chemical reaction

Answer 59

products

Question 60

a number placed in front of a element or a molecule to balance a chemical equation

Answer 60

coefficient

Question 61

a chemical reaction that splits molecules

Answer 61

decomposition

Question 62

a chemical reaction in which molecules split and rejoin with another atom

Answer 62

replacement

Question 63

a chemical reaction that joins atoms to make a compound

Answer 63

synthesis

Question 64

numbers and symbols used to represent changes that take place during a chemical reaction

Answer 64

chemical equation

Question 65

matter cannot be created nor destroyed so chemical reactions must be balanced

Answer 65

low of conservation of mass

Question 66

a well-mixed mixture of solvent and solute

Answer 66

solution

Question 67

the liquid into which the solute is dissolved

Answer 67

solvent

Question 68

the particles that are dissolved in a solvent

Answer 68

solute

Question 69

when a solution cannot dissolve anymore solute

Answer 69

saturated

Question 70

a substance with more H+ than OH- ions

Answer 70

an acid

Question 71

a substance that tastes sour and has a pH less than 7

Answer 71

an acid

Question 72

a substance that tastes bitter and has a pH greater than 7

Answer 72

a base

Question 73

a substance with more OH- ions than H+ ions

Answer 73

an base

Question 74

a substance used to determine the pH of a liquid

Answer 74

indicator

Question 75

a type of paper that tests pH of a substance

Answer 75

litmus paper

Question 76

a scale that measures the potential of hydrogen

Answer 76

pH scale

Question 77

a scale used to measure the acidity or alkalinity of a solution

Answer 77

pH sclae

Question 78

the happens when acids and bases are mixed

Answer 78

neutralization