At the start of observations Point A the

At the start of observations, Point A, the substance exists in the Solid _______state.

The temperature at this point is 10 o. C ________.

added As energy is _______, the temperature of the substance rises at a constant rate for 2 minutes.

At point B, the temperature of the 50 o. C substance is ______, and melt the solid begins to ______.

The temperature remains constant until the change from solid to liquid _____ is complete.

It has taken 3 minutes to add enough energy to melt the solid completely. From Point C to Point D, the substance is in the liquid _____ state.

10 o. C Its temperature rises at a constant 110 o. C rate to _____.

The temperature remains constant while the liquid changes to a gas _____.

At Point E, the substance exists as gas a ______.

Its temperature rises constantly ________ as heat is added.

When the gaseous substance is loses allowed to cool, it _______ energy.

The cooling curve will be the reverse of the warming curve.

Energy will be released as the substance changes from a liquid gas _____ to a _____ and liquid also from a ____ to a solid ____.

The amount of heat released during condensation will be the gained same as the amount ______ during vaporization.

Does the temperature increase during melting? NO

Is energy required for each phase change? YES

Can both liquid water and steam exist at 100 o. C? YES

What must be changed, temperature or heat energy, during condensation? Heat Energy

How would you describe the change in the arrangement of particles as heat energy and temperature increase? Become more spread out!!

What rule can you state about the relationship between phase changes and temperature? Can’t happen at the same time!

What rule can you state about the relationship between phase changes and heat energy? Heat energy is required for phase change!!

What phase of matter is found on the “Red” part of graph? A. Solid B. Liquid C. Gas D. Solid and Liquid E. Liquid and Gas

What phase of matter is found on the “Red” part of graph? A. Solid B. Liquid C. Gas D. Solid and Liquid E. Liquid and Gas

What phase of matter is found on the “Red” part of graph? A. Solid B. Liquid C. Gas D. Solid and Liquid E. Liquid and Gas

What phase of matter is found on the “Red” part of graph? A. Solid B. Liquid C. Gas D. Solid and Liquid E. Liquid and Gas

What phase of matter is found on the “Red” part of graph? A. Solid B. Liquid C. Gas D. Solid and Liquid E. Liquid and Gas

What type of change is occurring at the “Red” part of graph? A. DT B. D phase C. Both DT and D phase D. Neither DT and D phase

What type of change is occurring at the “Red” part of graph? A. DT B. D phase C. Both DT and D phase D. Neither DT and D phase

What type of change is occurring at the “Red” part of graph? A. DT B. D phase C. Both DT and D phase D. Neither DT and D phase

What type of change is occurring at the “Red” part of graph? A. DT B. D phase C. Both DT and D phase D. Neither DT and D phase

What type of change is occurring at the “Red” part of graph? A. DT B. D phase C. Both DT and D phase D. Neither DT and D phase

What is the Melting Point of this substance? 90 o. C 25 o. C A. 0 o. C B. 25 o. C C. 90 o. C D. 100 o. C

What is the Boiling Point of this substance? 90 o. C 25 o. C A. 0 o. C B. 25 o. C C. 90 o. C D. 100 o. C

Understand this statement and you will understand Phase Change Diagrams: When you add heat to something, one of two things will happen, but they will never happen at the same time!!!! 1. Substance will change temperature. 2. Substance will change phase.

Is heat being added or removed? ? ? DT DPhase Solid Liquid Gas Melting Pt. Boiling Pt.

DPhase

Boiling Pt. Melting Pt.

DT DT DT

Gas Liquid Solid

DT Boiling Pt. Gas DPhase DT Melting Pt. DPhase DT Solid Liquid

If you take a block of ice at o -25 C and place it on a stove which is turned on high(which is adding heat at a constant rate, what happens? ? ARE YOU SURE? ?

When you add heat to something, one of two things will happen, but they will never happen at the same time!!!! 1. Substance will change temperature. 2. Substance will change phase.

Bookwork: • P. 163 1 -5 • P. 170 1 -5