matter and materials definitions

Question 1

atom

Answer 1

the smallest particle an element can exist in

Question 2

molecule

Answer 2

a molecule consists of two or more non-metal atoms

Question 3

elements

Answer 3

the purest form of a substance that consists of one type of atom

Question 4

diatomic molecule

Answer 4

two non metal atoms chemically combined

Question 5

ionic crystal lattice

Answer 5

when metal atoms chemically combine with non metal atoms to form ions.

Question 6

chemical formula

Answer 6

the simplest ratio with which elements can combine to form a compound

Question 7

ductile

Answer 7

metals that can be drawn into thin wire

Question 8

malleable

Answer 8

metals that can be molded into shape or hammered

Question 9

atomic number

Answer 9

number of protons in the nucleus of an atom (#electrons=#protons)

Question 10

mass number

Answer 10

number of protons and neutrons in the nucleus of an atom

Question 11

ions

Answer 11

atoms which have lost or gained electrons

Question 12

cation

Answer 12

an atom that has lost electrons(positive charge)

Question 13

anion

Answer 13

an atom that has gained electrons(negative charge)

Question 14

valence electrons

Answer 14

and electron found in the outer most shell(the group number)

Question 15

valency

Answer 15

the charge of an element

Question 16

exothermic reaction

Answer 16

During a chemical reaction more energy is given out to form product bonds than is taken in to break

Question 17

endothermic reaction

Answer 17

During a chemical reaction more energy is absorbed to break reactant bonds than is released out to form product bonds

Question 18

mixture

Answer 18

a combination of two or more elements or compounds that can be separated using a physical technique