State Changes
Name:_____________________
Melting point oC
Substance
ammonia
iron
lead
mercury
sulfur
table salt
water
1.
Liquid
-33
2750
1751
357
445
1473
100
Gas
Convert the melting point of each substance to Kelvins:
ammonia:196
2.
-77
1535
327
-39
112
808
0
Solid
Boiling point oC
iron:______
lead: ______
mercury:______
sulfer: _______
Which of the substances listed above has a Boiling Point of:
373 K: water (100 + 273 = 373)
240 K:___________
2024 K: ___________
3.
At what temperature does iron freeze?1535
4.
At what temperature does iron boil?__________________
5.
Is iron a solid, liquid, or gas at 1000 oC?__________________
6.
Is lead a solid, liquid, or gas at 1000 oC? liquid (MP = 327, BP = 1751)
7.
Is mercury a solid, liquid, or gas at -50 oC?__________________
8.
Is sulfur a solid, liquid, or gas at 500 oC?__________________
9.
Is table salt a solid liquid or gas at 1000 oC?__________________
10.
what is the hottest temperature that Sulfur can be a liquid?___________
11.
12.
At what temperature do the molecules of mercury in a gas state begin to remain in contact after
colliding with each other?___________
What is the name of the state change described above?____________________________________
13.
Would sulfur be a solid, liquid, or gas in a pot of boiling water?______________________________
14.
What is the lowest temperature that Mercury can be a liquid? What is the melting point
15.
At what temperature do the atoms in table salt begin to move past each other? ________________
16.
What is the name of the state change described above?_________________________________
17.
If you were in Antarctica and the temperature was -50 oC, would
ammonia be in a solid, liquid, or gaseous state? ________________________________________
18.
In what state of matter is the hydrogen in the sun ? ___________________________________
Answer 19 – 23 with the following terms: melting, freezing, boiling, condensation, or sublimation
19.
atoms begin to lock into place: _______________________________________________
20.
A direct change from solid to gas: __________________________________
21.
atoms that were in contact begin to move away from each other: _____________________________
22.
atoms begin to change positions: Melting
23.
atoms begin to stick together when they touch: __________________________________
24.
What state of matter is characterized by molecules that are in contact with each other and cannot
move past each other? __________________________________
25.
What state of matter is characterized by molecules not in contact with each other and
can move past each other? gas
26.
What state of matter is characterized by molecules that are in contact with each other but can move
past each other?_______________________________
27.
Why do solids have a definite shape? _________________________________________________
_______________________________________________________________________________
28.
Why do liquids have a definite volume?________________________________________________
________________________________________________________________________________
29. Look at the graph above. What is the melting point of this substance? _____________
30. Identify the substance shown on the graph above by comparing its melting point to those shown on the
state change data table on the front of this sheet: _________________________
31. How long did the melting process last once it began?
it did not begin melting until the 20 second mark