Question

Plz help with dis science

Answer 1

I'll give you some of them, but I want you to promise to
look them up, either on line or in a book, and read more
about them, even after you have the answers.

This whole sheet is talking about the "states" of matter,
and changes between the states.

There are three "states" of matter: 
-- solid like ice
-- liquid like runny water
-- gas, like steam
 
1).  When a substance changes from one to another,
that's a "change of state".

2).  Which of these states has a definite shape and volume ?
(It doesn't make puddle, and it doesn't fill up the room. It's "solid".)


3).  You know this one.  What is it when ice changes to runny water ?

4).  Which state can you put into a jar, and it gets round like the jar
but it doesn't fill up the jar ?

5).  You know this.  What is it when runny water changes to ice ?

6).  Which state fills up anything you put it into ?

7).  I don't know this one.  It's either endothermic or exothermic.
I can never get these straight.

8).  Same as #6.  Which state fills up anything you put it into ?

9).  I don't know the term that includes both boiling and evaporation.

10).  This is the opposite of #7. 
As I said, I can never get these straight.

11).  Changing from a gas to a liquid, like steam to water,
or breathing fog onto a mirror, is "condensation".

12).  This is interesting.  If you have a lump of dry ice on the table
and it melts, there's no puddle around it !  It goes directly from solid
to carbon dioxide gas, and never forms liquid.  That process is called "sublimation", and we say that the dry ice "sublimes".