Ch. 11

Question 1

is anything that has mass and takes up space

Answer 1

matter

Question 2

is a small particle that is the building block of matter

Answer 2

atom

Question 3

is matter with a composition that is always the same

Answer 3

substance

Question 4

is a substance made of only one kind of atom

Answer 4

element

Question 5

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

Answer 5

molecule

Question 6

is a substance made of two or more elements that are chemically joined in a specific combination

Answer 6

compound

Question 7

is a matter that can vary in composition

Answer 7

mixture

Question 8

is a mixture in which the 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

is the region at the center of an atom that contains most of the mass of the atom

Answer 10

nucleus

Question 11

is a positively charged particle in the nucleus of an atom

Answer 11

proton

Question 12

is an uncharged particle in the nucleus of an atom

Answer 12

neutron

Question 13

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

Answer 13

electron

Question 14

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

Answer 14

electron cloud

Question 15

is the number of protons in the nucleus of an atom of an element

Answer 15

atomic number

Question 16

is one of two more atoms of an element having the same number of protons, but a different number of neutrons

Answer 16

isotope

Question 17

is an atom that has a charge because it has gained or lost electrons

Answer 17

ion