introduction to matter/ atomic structure

Question 1

matter

Answer 1

anything that has mass and takes up space

Question 2

pure substance

Answer 2

cannot be broken down physically

Question 3

mixtures

Answer 3

can be physically seperated

Question 4

elements

Answer 4

found on the periodic table

Question 5

compound

Answer 5

two or more types of atoms bonded together

Question 6

homogeneous mixture

Answer 6

appear uniform throughout solution

Question 7

heterogeneous mixture

Answer 7

two or more visible components

Question 8

separation techniques

Answer 8

filtration, by hand, evaporation, chemical reaction, distillation, magnetically, crystallization

Question 9

physical change

Answer 9

a usually reversible change in the physical property of a substance, such as size or shape

Question 10

chemical change

Answer 10

a usually irreversible chemical reaction is which a new substance is formed

Question 11

independent variables

Answer 11

a variable that does not change

Question 12

dependent variable

Answer 12

a variable that changes

Question 13

atomic number

Answer 13

number of protons

Question 14

mass number

Answer 14

protons + neutrons

Question 15

neutrons

Answer 15

atomic number - mass number

Question 16

electron configuration

Answer 16

represents an electron’s probable address and where electrons in each atom are located

Question 17

aufbau exclusion

Answer 17

electrons fill lower energy levels before moving to higher ones

Question 18

pauli exclusion

Answer 18

opposite spins

Question 19

hund’s rule

Answer 19

electrons will spread out within a subshell before doubling up