IPC 7.1 & 7.2: States of Matter & Changes

Heating a substance to its melting point and watching it change from a solid into a liquid is a ​ (a)   property/change, and a substance changing into an entirely new substance is a ​ (b)   property/change.

• physical
• chemical
• specific heat
• stoichiometric

Identify the property types described in the examples below.

Groups:

(a) Physical Property

,

(b) Chemical Property

• Honey is poured from a jar very slowly onto a bowl of cereal.

• A nail is found at a construction site and is coated with crusty red deposits.

• When the Statue of Liberty changed colors from copper to blue-green.

• Shattering glass

• Moldy bread

• Steam condensing on the underside of a lid

• Slicing raw meat

The ​ (a)   is the point at which a liquid becomes a solid.

The ​​ (b)   is the point at which a solid becomes a liquid.

Energy is the form of ​ (c)   is required to change a solid to a liquid.

A solid can change directly to a gas due to ​ (d)   .

• freezing point
• melting point
• heat
• sublimation

Label the different transitions to states of matter.

a

b

c

d

e

f

Sublimation

Condensation

Deposition

Melting

Freezing

Evaporation

When matter changes phase, such as from liquid to gas, which is true?

• The phase change occurs randomly.

• Only once the phase change is complete will the new state of matter change temperature.

• Temperature changes can override phase changes, for example: liquids above boiling point.

• The phase change is timed.

Which of the following are physical changes?

• iron rusting

• copper changing color

• boiling water

• hydrogen and oxygen producing water

• ice cream melting

Which of the following describes the process of sublimation?

• a phase change with no intermediate liquid stage

• a phase change with an intermediate liquid stage

• a phase change of a solid melting to a liquid

• a phase change of a gas into a solid

• a phase change of a solid into a gas

What must happen for a chemical change to occur?

• Substances must form a precipitate

• Substances must change state

• Substances must change in temperature

• Substances must react to form new substances

A student heats two unknown solids. The graph below shows how the temperature of each sample changes during the experiment.

The student knows that when the temperature of a sample is not changing, the sample is either melting or boiling. Based on the graph, which conclusion should draw about these two unknowns?

• Unknown B boiled first

• Unknown A has the higher boiling point

• Unknown B melted first

• Unknown B has the lower melting point