Chapter 2.1 & 2.2

Question 1

composed of matter

Answer 1

organisms

Question 2

anything that takes up space and has mass

Answer 2

matter

Question 3

exist in different forms

Answer 3

matter

Question 4

matter cannot be neither created nor destroyed in chemical reactions

Answer 4

law of conservation of mass

Question 5

mass of reactants = ?

Answer 5

mass of products

Question 6

a substance that can’t be broken down into a chemical reaction

Answer 6

element

Question 7

a substance consisting of 2 or more elements

Answer 7

compound

Question 8

matter is composed of particles called atoms

Answer 8

dalton atomic theory

Question 9

all atoms of a given elements have the same properties

Answer 9

dalton atomic theory

Question 10

smallest unit of matter that retains properties of an element

Answer 10

atom

Question 11

positively charges in the nucleus

Answer 11

protons

Question 12

no charge in the nucleus

Answer 12

neutrons

Question 13

negatively charges in the electron shell

Answer 13

electrons

Question 14

equal to number of protons

Answer 14

atomic number

Question 15

formed naturally or through radiactive decay

Answer 15

isotopes

Question 16

nuclei don’t lose particles

Answer 16

stable isotopes

Question 17

nucleus decays and gives off particles/energy

Answer 17

radioactive isotope

Question 18

two or more atoms held together by covalent bonds

Answer 18

molecule