Chemestry

Question 1

Change in form, NOT composition
NO new substances formed
Change can be reversed

Answer 1

Physical Change

Question 2

Re-arrangement of atoms
1 or more new substances formed
Difficult or impossible to reverse

Answer 2

chemical change

Question 3

quantitive physical property

Answer 3

(measurable, e.g. boiling point)

Question 4

qualitative physical property

Answer 4

(without measurement, e.g. color)

Question 5

physical property

Answer 5

observed/measured without forming a new substance

Question 6

chemical property

Answer 6

how a substance reacts with another substance

Question 7

Diatomic molecules

Answer 7

BrINClHOF - elements will always present together when alone

Question 8

Molecules

Answer 8

cluster of atoms

Question 9

Ionization

Answer 9

(transferring electrons between atoms and therefore altering the balance of negative and positive charges)

Question 10

which does not create ions? molecular or ionic?

Answer 10

molecular

Question 11

when 2 + substances undergo a reorganization of atoms to form other substances

Answer 11

chemical reaction

Question 12

To break bonds, energy must be added / absorbed

Answer 12

endothermic

Question 13

To form bonds, energy must be released

Answer 13

exothermic

Question 14

combustion products

Answer 14

CO2 + 2H2O + heat

Question 15

corrosion reactants

Answer 15

metal + salty water + air

Question 16

enzyme

Answer 16

biological catalyst

Question 17

other reaction types

Answer 17

formations, decompositions, and replacements (single or double)