Question

this graph represents water
between 9 and 17 minutes the material became more dense
this is an endothermic phase change graph
freezing took more time to happen compared to condensation
this is an exothermic phase change graph
at 120 degrees, both the gas and liquid would be present
between 9 and 17 minutes the material became less dense
it took more time to condensate than freeze

Explanation:

• Water has a melting - freezing point of 0°C and boiling - condensation point of 100°C. The graph doesn't match water's phase - change temperatures, so it doesn't represent water.
• Between 9 and 17 minutes, the temperature is decreasing during a phase change. As substances change from gas to liquid (condensation in this range), they become more dense.
• An exothermic process releases heat and the temperature decreases over time as in this graph. An endothermic process would require heat input and show an increase in temperature during phase change.
• The flat - line representing condensation (9 - 17 minutes) is longer than the flat - line representing freezing (18 - 20 minutes), so it took more time to condensate than freeze. At 120 degrees, above the boiling point of water (assuming standard conditions), both gas and liquid can co - exist during the phase change process.

Answer:

• This graph represents water: False
• Between 9 and 17 minutes the material became more dense: True
• This is an endothermic phase change graph: False
• Freezing took more time to happen compared to condensation: False
• This is an exothermic phase change graph: True
• At 120 degrees, both the gas and liquid would be present: True
• Between 9 and 17 minutes the material became less dense: False
• It took more time to condensate than freeze: True