Change Worksheet. pdf PHYSICAL AND CHEMICAL PROPERTIES AND CHANGES
Name
PHYSICAL PROPERTY
1. observed with senses
2. determined without destroying matter
CHEMICAL PROPERTY
1. indicates how a substance
reacts with something else
2. matter will be changed into a new
substance after the reaction
Identify the following as a chemical (C) or physical property (P):
1. blue color
8. melting point
2. density
9. reacts with water
3. flammability (burns)
10. hardness
4. solubility (dissolves)
11. boiling point
5. reacts with acid
12. luster
6. supports combustion
13. odor
7. sour taste
14. reacts with air

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

it's 3.2 on edge, i just took the test.