fall exam study guide

Question 1

material that contains 3 elements joined in a fixed proportion

Answer 1

compound

Question 2

building blocks of all matter

Answer 2

atoms

Question 3

atomic mass

Answer 3

how much it weighs and number of protons and electrons

Question 4

why do atoms gain and lose electrons

Answer 4

to become balanced

Question 5

unit for atomic mass

Answer 5

AMU - atomic mass unit

Question 6

how can you find atomic mass of an element

Answer 6

protons + neutrons

Question 7

when an electron moves energy levels it is

Answer 7

gaining or losing energy

Question 8

how to find number of neutrons in an element

Answer 8

subtract number of protons or atomic mass from the mass number

Question 9

where is chemical energy stored

Answer 9

nucleus

Question 10

List the diatomic molecules

Answer 10

hydrogen , nitrogen, oxygen, fluorine , chlorine , bromine , and iodine

Question 11

substances that undergo change in a chemical reaction arr

Answer 11

reactants

Question 12

what happens when you remove a neutron from an atom

Answer 12

you create a new isotope

Question 13

what happens when you remove a electron from an atom `

Answer 13

it becomes positive

Question 14

what indicated the number of energy levels of an atom

Answer 14

the period row or number

Question 15

how did Mendeleev organize his periodic table

Answer 15

in order of atomic mass

Question 16

what did Rutherford say the nucleus of an atom was

Answer 16

dense positively charged mass in the middle of an atom

Question 17

what element in group 1 is most reactive

Answer 17

francium

Question 18

pollyatomic ion

Answer 18

covalently bonded group of atoms that acts as as one