1 The table gives the melting points, the boiling points and the electrical properties of six
substances A to F.
EO:
substance
melting point boiling point
1°C
1°C
A
-210
-196
B
777
1627
С
962
2212
electrical conductivity electrical conductivity
as a solid
as a liquid
does not conduct does not conduct
does not conduct good conductor
good conductor good conductor
does not conduct does not conduct
does not conduct does not conduct
good conductor good conductor
D
-94
63
E
1410
2355
F
1064
2807
(a) Which two substances could be metals?
(b) Which substance could be nitrogen?
[1]
(c) Which substance is an ionic solid?
[1]
(d) Which substance is a liquid at room temperature?
(1)
(e) Which substance has a giant covalent structure similar to that of diamond? [1]
(0) Which two substances could exist as simple covalent molecules?
[1]
[Total: 6]​

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

In which of these cases are the two wave points considered to be in phase with each other?