Lesson 1

Question 1

is anything that has a mass and takes up space

Answer 1

matter

Question 2

is a small particale that is the building block 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

two or more atoms that held together by chemical bond sand acts as a unit

Answer 5

molecule

Question 6

ia a sustance made of two or more elements that are chemically joined in a specific combination

Answer 6

compound

Question 7

is matter that can vary in composistion

Answer 7

mixture

Question 8

is a mixture in which the subtances are not evenly mixed

Answer 8

heterogeneous

Question 9

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

Answer 9

homogeneous mixture

Question 10

is the region at the center of an atom that contains nucleus

Answer 10

nucleus

Question 11

is a positively charged particale in the nucleus of an atom

Answer 11

proton

Question 12

is an uncharged particale in the nucleus of an atom

Answer 12

neutron

Question 13

is a negatively charged paticals that occupies the space in atom outside the nuclus

Answer 13

electron

Question 14

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

Answer 14

electron cloud

Question 15

is the number of protons in the nuclus 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