Chapter 11

Question 1

anything that has mass and takes up space

Answer 1

matter

Question 2

a small particle that is the building block of matter

Answer 2

atom

Question 3

matter with a composition that is always the same

Answer 3

stubstance

Question 4

a substance that consists of only one type of atom

Answer 4

element

Question 5

two or more atoms that are held together by covalent bonds and act as a unit

Answer 5

molecule

Question 6

a substance containing atoms of two or more different elements chemically bonded together

Answer 6

compound

Question 7

matter that can vary in composition

Answer 7

mixture

Question 8

a mixture in which substances are not evenly mixed

Answer 8

heterogeneous mixture

Question 9

a mixture in which two or more substances are evenly mixed but not bonded together

Answer 9

homogeneous mixture

Question 10

the region in the center of an atom where most of an atom’s mass and positive charge is concentrated

Answer 10

nucleus

Question 11

a positively charged particle in the nucleus of an atom

Answer 11

proton

Question 12

a neutral particle in the nucleus of an atom

Answer 12

neutron

Question 13

a negatively charged particle that occupies the space in an atom outside the nucleus

Answer 13

electron

Question 14

the region surrounding an atom’s nucleus where one or more electrons are most likely to be found

Answer 14

electron cloud

Question 15

the number of protons in an atom of an element

Answer 15

atomic number

Question 16

atoms of the same element that have different numbers of neutrons

Answer 16

isotope

Question 17

an atom that is no longer neutral because it has gained or lost electrons

Answer 17

ion