Question

What information is in a phase change diagram?

Select all that apply.

Responses

the temperature at which the substance freezesthe temperature at which the substance freezes

how much energy it takes to melt the substancehow much energy it takes to melt the substance

the temperature at which the substance meltsthe temperature at which the substance melts

the temperature at which the substance decomposesthe temperature at which the substance decomposes

how much mass the substance hashow much mass the substance has

Answer 1

A phase change diagram provides several key pieces of information about a substance, mostly related to its states (solid, liquid, gas) and the transitions between these states. Based on the options provided, the following responses are applicable:

1. **the temperature at which the substance freezes** - This is the freezing point of the substance.

2. **how much energy it takes to melt the substance** - This refers to the enthalpy of fusion, the amount of energy required to change the substance from solid to liquid.

3. **the temperature at which the substance melts** - This is the melting point of the substance.

4. **the temperature at which the substance decomposes** - Some phase diagrams include decomposition, though not all do.

The following response is **not applicable**:

5. **how much mass the substance has** - A phase change diagram does not provide information about the mass of the substance; it focuses on phase changes related to temperature and energy.

In summary, you should select the first four options as the correct responses.