Question

this is physical science All changes in phase are
a. Chemical changes.
b physical changes.
c. chemical reactions.
d. chemical properties.

Answer 1

c

Answer 2

ok thx yu but r yu sure its right?

Answer 3

it depends on wat it is if its physical its b

Answer 4

Wait, physical science.. it would be B

Answer 5

okay so its b for sure?

Answer 6

What is the exact question?

Answer 7

All changes in phase are
a. Chemical changes.
b physical changes.
c. chemical reactions.
d. chemical properties.

Answer 8

b) physical changes

Answer 9

it depends on wat it is

Answer 10

its physical science

Answer 11

phase change means changing from solid phase to liquid phase or from liquid phase to gaseous phase

these changes can be easily reversed and nothing new is formed

Answer 12

then its b physical change

Answer 13

okay thanks ppl i have another question also its,,

Answer 14

Matter in the _____ phase is very high in energy and dangerous to living
things.

Answer 15

if you cool water it changes to ice (liquid to solid phase)
u can get back water easily by keeping the ice at room temperature.

u can melt solid wax by heating it a little and it becomes solid again on cooling

Answer 16

plasma phase

Answer 17

oh thank yu

Answer 18

plasma

Answer 19

whats an amorphous solid?

Answer 20

a solid in which there is no long-range order of the positions of the atoms.

Answer 21

b

Answer 22

buut can i please get a better explanation for a amorphous solid

Answer 23

?

Answer 24

Normal solids have a proper well defined crystal structure in which atoms/molecules are held together in a well defined manner.

Amorphous solids are substances whose particles do not posses a regular orderly arrangement but have short range order. When amorphous solids are heated they become crystalline at some temperature. Properties of amorphous solids are:

They do not have sharp melting point.
Under go liquefaction over a broad range of temperature.
Do not posses characteristics heats of fusion.
When heated and cooled slowly they become crystalline.
Example: Glass and plastics.

Answer 25

oh thanks very much